/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.android.systemui.statusbar.notification.stack;

import static android.service.notification.NotificationStats.DISMISSAL_SHADE;
import static android.service.notification.NotificationStats.DISMISS_SENTIMENT_NEUTRAL;

import static com.android.systemui.Dependency.ALLOW_NOTIFICATION_LONG_PRESS_NAME;
import static com.android.systemui.statusbar.notification.ActivityLaunchAnimator.ExpandAnimationParameters;
import static com.android.systemui.statusbar.notification.stack.NotificationSectionsManager.BUCKET_SILENT;
import static com.android.systemui.statusbar.notification.stack.StackScrollAlgorithm.ANCHOR_SCROLLING;
import static com.android.systemui.statusbar.notification.stack.StackStateAnimator.ANIMATION_DURATION_SWIPE;
import static com.android.systemui.statusbar.phone.NotificationIconAreaController.HIGH_PRIORITY;
import static com.android.systemui.util.InjectionInflationController.VIEW_CONTEXT;

import static java.lang.annotation.RetentionPolicy.SOURCE;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.TimeAnimator;
import android.animation.ValueAnimator;
import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Outline;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.PointF;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.ServiceManager;
import android.provider.Settings;
import android.service.notification.NotificationListenerService;
import android.service.notification.StatusBarNotification;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.MathUtils;
import android.util.Pair;
import android.view.ContextThemeWrapper;
import android.view.DisplayCutout;
import android.view.InputDevice;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewOutlineProvider;
import android.view.ViewTreeObserver;
import android.view.WindowInsets;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.widget.OverScroller;
import android.widget.ScrollView;

import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.graphics.ColorUtils;
import com.android.internal.logging.MetricsLogger;
import com.android.internal.logging.UiEvent;
import com.android.internal.logging.UiEventLogger;
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.internal.statusbar.IStatusBarService;
import com.android.internal.statusbar.NotificationVisibility;
import com.android.keyguard.KeyguardSliceView;
import com.android.settingslib.Utils;
import com.android.systemui.Dependency;
import com.android.systemui.Dumpable;
import com.android.systemui.ExpandHelper;
import com.android.systemui.Interpolators;
import com.android.systemui.R;
import com.android.systemui.SwipeHelper;
import com.android.systemui.colorextraction.SysuiColorExtractor;
import com.android.systemui.plugins.FalsingManager;
import com.android.systemui.plugins.statusbar.NotificationMenuRowPlugin;
import com.android.systemui.plugins.statusbar.NotificationMenuRowPlugin.MenuItem;
import com.android.systemui.plugins.statusbar.NotificationMenuRowPlugin.OnMenuEventListener;
import com.android.systemui.plugins.statusbar.NotificationSwipeActionHelper;
import com.android.systemui.plugins.statusbar.StatusBarStateController;
import com.android.systemui.plugins.statusbar.StatusBarStateController.StateListener;
import com.android.systemui.statusbar.CommandQueue;
import com.android.systemui.statusbar.DragDownHelper.DragDownCallback;
import com.android.systemui.statusbar.EmptyShadeView;
import com.android.systemui.statusbar.FeatureFlags;
import com.android.systemui.statusbar.NotificationLockscreenUserManager;
import com.android.systemui.statusbar.NotificationLockscreenUserManager.UserChangedListener;
import com.android.systemui.statusbar.NotificationRemoteInputManager;
import com.android.systemui.statusbar.NotificationShelf;
import com.android.systemui.statusbar.RemoteInputController;
import com.android.systemui.statusbar.StatusBarState;
import com.android.systemui.statusbar.SysuiStatusBarStateController;
import com.android.systemui.statusbar.notification.DynamicPrivacyController;
import com.android.systemui.statusbar.notification.FakeShadowView;
import com.android.systemui.statusbar.notification.ForegroundServiceDismissalFeatureController;
import com.android.systemui.statusbar.notification.NotificationEntryListener;
import com.android.systemui.statusbar.notification.NotificationEntryManager;
import com.android.systemui.statusbar.notification.NotificationUtils;
import com.android.systemui.statusbar.notification.ShadeViewRefactor;
import com.android.systemui.statusbar.notification.ShadeViewRefactor.RefactorComponent;
import com.android.systemui.statusbar.notification.VisualStabilityManager;
import com.android.systemui.statusbar.notification.collection.NotifCollection;
import com.android.systemui.statusbar.notification.collection.NotifPipeline;
import com.android.systemui.statusbar.notification.collection.NotificationEntry;
import com.android.systemui.statusbar.notification.collection.notifcollection.DismissedByUserStats;
import com.android.systemui.statusbar.notification.collection.notifcollection.NotifCollectionListener;
import com.android.systemui.statusbar.notification.logging.NotificationLogger;
import com.android.systemui.statusbar.notification.row.ActivatableNotificationView;
import com.android.systemui.statusbar.notification.row.ExpandableNotificationRow;
import com.android.systemui.statusbar.notification.row.ExpandableView;
import com.android.systemui.statusbar.notification.row.FooterView;
import com.android.systemui.statusbar.notification.row.ForegroundServiceDungeonView;
import com.android.systemui.statusbar.notification.row.NotificationBlockingHelperManager;
import com.android.systemui.statusbar.notification.row.NotificationGuts;
import com.android.systemui.statusbar.notification.row.NotificationGutsManager;
import com.android.systemui.statusbar.notification.row.NotificationSnooze;
import com.android.systemui.statusbar.notification.row.StackScrollerDecorView;
import com.android.systemui.statusbar.phone.HeadsUpAppearanceController;
import com.android.systemui.statusbar.phone.HeadsUpManagerPhone;
import com.android.systemui.statusbar.phone.HeadsUpTouchHelper;
import com.android.systemui.statusbar.phone.KeyguardBypassController;
import com.android.systemui.statusbar.phone.LockscreenGestureLogger;
import com.android.systemui.statusbar.phone.NotificationGroupManager;
import com.android.systemui.statusbar.phone.NotificationGroupManager.OnGroupChangeListener;
import com.android.systemui.statusbar.phone.NotificationIconAreaController;
import com.android.systemui.statusbar.phone.NotificationPanelViewController;
import com.android.systemui.statusbar.phone.ScrimController;
import com.android.systemui.statusbar.phone.ShadeController;
import com.android.systemui.statusbar.phone.StatusBar;
import com.android.systemui.statusbar.policy.ConfigurationController;
import com.android.systemui.statusbar.policy.ConfigurationController.ConfigurationListener;
import com.android.systemui.statusbar.policy.HeadsUpUtil;
import com.android.systemui.statusbar.policy.ScrollAdapter;
import com.android.systemui.statusbar.policy.ZenModeController;
import com.android.systemui.tuner.TunerService;
import com.android.systemui.util.Assert;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.lang.annotation.Retention;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.function.BiConsumer;

import javax.inject.Inject;
import javax.inject.Named;

/**
 * A layout which handles a dynamic amount of notifications and presents them in a scrollable stack.
 */
public class NotificationStackScrollLayout extends ViewGroup implements ScrollAdapter,
        NotificationListContainer, ConfigurationListener, Dumpable,
        DynamicPrivacyController.Listener {

    public static final float BACKGROUND_ALPHA_DIMMED = 0.7f;
    private static final String TAG = "StackScroller";
    private static final boolean DEBUG = false;
    private static final float RUBBER_BAND_FACTOR_NORMAL = 0.35f;
    private static final float RUBBER_BAND_FACTOR_AFTER_EXPAND = 0.15f;
    private static final float RUBBER_BAND_FACTOR_ON_PANEL_EXPAND = 0.21f;
    /**
     * Sentinel value for no current active pointer. Used by {@link #mActivePointerId}.
     */
    private static final int INVALID_POINTER = -1;
    /**
     * The distance in pixels between sections when the sections are directly adjacent (no visible
     * gap is drawn between them). In this case we don't want to round their corners.
     */
    private static final int DISTANCE_BETWEEN_ADJACENT_SECTIONS_PX = 1;
    private final KeyguardBypassController mKeyguardBypassController;
    private final DynamicPrivacyController mDynamicPrivacyController;
    private final SysuiStatusBarStateController mStatusbarStateController;

    private ExpandHelper mExpandHelper;
    private final NotificationSwipeHelper mSwipeHelper;
    private int mCurrentStackHeight = Integer.MAX_VALUE;
    private final Paint mBackgroundPaint = new Paint();
    private final boolean mShouldDrawNotificationBackground;
    private boolean mHighPriorityBeforeSpeedBump;
    private final boolean mAllowLongPress;
    private boolean mDismissRtl;

    private float mExpandedHeight;
    private int mOwnScrollY;
    private View mScrollAnchorView;
    private int mScrollAnchorViewY;
    private int mMaxLayoutHeight;

    private VelocityTracker mVelocityTracker;
    private OverScroller mScroller;
    /** Last Y position reported by {@link #mScroller}, used to calculate scroll delta. */
    private int mLastScrollerY;
    /**
     * True if the max position was set to a known position on the last call to {@link #mScroller}.
     */
    private boolean mIsScrollerBoundSet;
    private Runnable mFinishScrollingCallback;
    private int mTouchSlop;
    private float mSlopMultiplier;
    private int mMinimumVelocity;
    private int mMaximumVelocity;
    private int mOverflingDistance;
    private float mMaxOverScroll;
    private boolean mIsBeingDragged;
    private int mLastMotionY;
    private int mDownX;
    private int mActivePointerId = INVALID_POINTER;
    private boolean mTouchIsClick;
    private float mInitialTouchX;
    private float mInitialTouchY;

    private Paint mDebugPaint;
    private int mContentHeight;
    private int mIntrinsicContentHeight;
    private int mCollapsedSize;
    private int mPaddingBetweenElements;
    private int mIncreasedPaddingBetweenElements;
    private int mMaxTopPadding;
    private int mTopPadding;
    private int mBottomMargin;
    private int mBottomInset = 0;
    private float mQsExpansionFraction;

    /**
     * The algorithm which calculates the properties for our children
     */
    protected final StackScrollAlgorithm mStackScrollAlgorithm;

    private final AmbientState mAmbientState;
    private NotificationGroupManager mGroupManager;
    private HashSet<ExpandableView> mChildrenToAddAnimated = new HashSet<>();
    private ArrayList<View> mAddedHeadsUpChildren = new ArrayList<>();
    private ArrayList<ExpandableView> mChildrenToRemoveAnimated = new ArrayList<>();
    private ArrayList<ExpandableView> mChildrenChangingPositions = new ArrayList<>();
    private HashSet<View> mFromMoreCardAdditions = new HashSet<>();
    private ArrayList<AnimationEvent> mAnimationEvents = new ArrayList<>();
    private ArrayList<View> mSwipedOutViews = new ArrayList<>();
    private final StackStateAnimator mStateAnimator = new StackStateAnimator(this);
    private boolean mAnimationsEnabled;
    private boolean mChangePositionInProgress;
    private boolean mChildTransferInProgress;

    /**
     * The raw amount of the overScroll on the top, which is not rubber-banded.
     */
    private float mOverScrolledTopPixels;

    /**
     * The raw amount of the overScroll on the bottom, which is not rubber-banded.
     */
    private float mOverScrolledBottomPixels;
    private NotificationLogger.OnChildLocationsChangedListener mListener;
    private OnOverscrollTopChangedListener mOverscrollTopChangedListener;
    private ExpandableView.OnHeightChangedListener mOnHeightChangedListener;
    private OnEmptySpaceClickListener mOnEmptySpaceClickListener;
    private boolean mNeedsAnimation;
    private boolean mTopPaddingNeedsAnimation;
    private boolean mDimmedNeedsAnimation;
    private boolean mHideSensitiveNeedsAnimation;
    private boolean mActivateNeedsAnimation;
    private boolean mGoToFullShadeNeedsAnimation;
    private boolean mIsExpanded = true;
    private boolean mChildrenUpdateRequested;
    private boolean mIsExpansionChanging;
    private boolean mPanelTracking;
    private boolean mExpandingNotification;
    private boolean mExpandedInThisMotion;
    private boolean mShouldShowShelfOnly;
    protected boolean mScrollingEnabled;
    protected FooterView mFooterView;
    protected EmptyShadeView mEmptyShadeView;
    private boolean mDismissAllInProgress;
    private boolean mFadeNotificationsOnDismiss;

    /**
     * Was the scroller scrolled to the top when the down motion was observed?
     */
    private boolean mScrolledToTopOnFirstDown;
    /**
     * The minimal amount of over scroll which is needed in order to switch to the quick settings
     * when over scrolling on a expanded card.
     */
    private float mMinTopOverScrollToEscape;
    private int mIntrinsicPadding;
    private float mStackTranslation;
    private float mTopPaddingOverflow;
    private boolean mDontReportNextOverScroll;
    private boolean mDontClampNextScroll;
    private boolean mNeedViewResizeAnimation;
    private ExpandableView mExpandedGroupView;
    private boolean mEverythingNeedsAnimation;

    /**
     * The maximum scrollPosition which we are allowed to reach when a notification was expanded.
     * This is needed to avoid scrolling too far after the notification was collapsed in the same
     * motion.
     */
    private int mMaxScrollAfterExpand;
    private ExpandableNotificationRow.LongPressListener mLongPressListener;
    boolean mCheckForLeavebehind;

    /**
     * Should in this touch motion only be scrolling allowed? It's true when the scroller was
     * animating.
     */
    private boolean mOnlyScrollingInThisMotion;
    private boolean mDisallowDismissInThisMotion;
    private boolean mDisallowScrollingInThisMotion;
    private long mGoToFullShadeDelay;
    private ViewTreeObserver.OnPreDrawListener mChildrenUpdater
            = new ViewTreeObserver.OnPreDrawListener() {
        @Override
        public boolean onPreDraw() {
            updateForcedScroll();
            updateChildren();
            mChildrenUpdateRequested = false;
            getViewTreeObserver().removeOnPreDrawListener(this);
            return true;
        }
    };
    private final UserChangedListener mLockscreenUserChangeListener = new UserChangedListener() {
        @Override
        public void onUserChanged(int userId) {
            updateSensitiveness(false /* animated */);
        }
    };
    private StatusBar mStatusBar;
    private int[] mTempInt2 = new int[2];
    private boolean mGenerateChildOrderChangedEvent;
    private HashSet<Runnable> mAnimationFinishedRunnables = new HashSet<>();
    private HashSet<ExpandableView> mClearTransientViewsWhenFinished = new HashSet<>();
    private HashSet<Pair<ExpandableNotificationRow, Boolean>> mHeadsUpChangeAnimations
            = new HashSet<>();
    private HeadsUpManagerPhone mHeadsUpManager;
    private final NotificationRoundnessManager mRoundnessManager;
    private boolean mTrackingHeadsUp;
    private ScrimController mScrimController;
    private boolean mForceNoOverlappingRendering;
    private final ArrayList<Pair<ExpandableNotificationRow, Boolean>> mTmpList = new ArrayList<>();
    private FalsingManager mFalsingManager;
    private final ZenModeController mZenController;
    private boolean mAnimationRunning;
    private ViewTreeObserver.OnPreDrawListener mRunningAnimationUpdater
            = new ViewTreeObserver.OnPreDrawListener() {
        @Override
        public boolean onPreDraw() {
            onPreDrawDuringAnimation();
            return true;
        }
    };
    private NotificationSection[] mSections;
    private boolean mAnimateNextBackgroundTop;
    private boolean mAnimateNextBackgroundBottom;
    private boolean mAnimateNextSectionBoundsChange;
    private int mBgColor;
    private float mDimAmount;
    private ValueAnimator mDimAnimator;
    private ArrayList<ExpandableView> mTmpSortedChildren = new ArrayList<>();
    private final Animator.AnimatorListener mDimEndListener = new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            mDimAnimator = null;
        }
    };
    private ValueAnimator.AnimatorUpdateListener mDimUpdateListener
            = new ValueAnimator.AnimatorUpdateListener() {

        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            setDimAmount((Float) animation.getAnimatedValue());
        }
    };
    protected ViewGroup mQsContainer;
    private boolean mContinuousShadowUpdate;
    private boolean mContinuousBackgroundUpdate;
    private ViewTreeObserver.OnPreDrawListener mShadowUpdater
            = new ViewTreeObserver.OnPreDrawListener() {

        @Override
        public boolean onPreDraw() {
            updateViewShadows();
            return true;
        }
    };
    private ViewTreeObserver.OnPreDrawListener mBackgroundUpdater = () -> {
                updateBackground();
                return true;
            };
    private Comparator<ExpandableView> mViewPositionComparator = new Comparator<ExpandableView>() {
        @Override
        public int compare(ExpandableView view, ExpandableView otherView) {
            float endY = view.getTranslationY() + view.getActualHeight();
            float otherEndY = otherView.getTranslationY() + otherView.getActualHeight();
            if (endY < otherEndY) {
                return -1;
            } else if (endY > otherEndY) {
                return 1;
            } else {
                // The two notifications end at the same location
                return 0;
            }
        }
    };
    private final ViewOutlineProvider mOutlineProvider = new ViewOutlineProvider() {
        @Override
        public void getOutline(View view, Outline outline) {
            if (mAmbientState.isHiddenAtAll()) {
                float xProgress = mHideXInterpolator.getInterpolation(
                        (1 - mLinearHideAmount) * mBackgroundXFactor);
                outline.setRoundRect(mBackgroundAnimationRect,
                        MathUtils.lerp(mCornerRadius / 2.0f, mCornerRadius,
                                xProgress));
                outline.setAlpha(1.0f - mAmbientState.getHideAmount());
            } else {
                ViewOutlineProvider.BACKGROUND.getOutline(view, outline);
            }
        }
    };
    private PorterDuffXfermode mSrcMode = new PorterDuffXfermode(PorterDuff.Mode.SRC);
    private boolean mPulsing;
    private boolean mGroupExpandedForMeasure;
    private boolean mScrollable;
    private View mForcedScroll;

    /**
     * @see #setHideAmount(float, float)
     */
    private float mInterpolatedHideAmount = 0f;

    /**
     * @see #setHideAmount(float, float)
     */
    private float mLinearHideAmount = 0f;

    /**
     * How fast the background scales in the X direction as a factor of the Y expansion.
     */
    private float mBackgroundXFactor = 1f;

    private boolean mSwipingInProgress;

    private boolean mUsingLightTheme;
    private boolean mQsExpanded;
    private boolean mForwardScrollable;
    private boolean mBackwardScrollable;
    private NotificationShelf mShelf;
    private int mMaxDisplayedNotifications = -1;
    private int mStatusBarHeight;
    private int mMinInteractionHeight;
    private boolean mNoAmbient;
    private final Rect mClipRect = new Rect();
    private boolean mIsClipped;
    private Rect mRequestedClipBounds;
    private boolean mInHeadsUpPinnedMode;
    private boolean mHeadsUpAnimatingAway;
    private int mStatusBarState;
    private int mCachedBackgroundColor;
    private boolean mHeadsUpGoingAwayAnimationsAllowed = true;
    private Runnable mReflingAndAnimateScroll = () -> {
        if (ANCHOR_SCROLLING) {
            maybeReflingScroller();
        }
        animateScroll();
    };
    private int mCornerRadius;
    private int mSidePaddings;
    private final Rect mBackgroundAnimationRect = new Rect();
    private ArrayList<BiConsumer<Float, Float>> mExpandedHeightListeners = new ArrayList<>();
    private int mHeadsUpInset;
    private HeadsUpAppearanceController mHeadsUpAppearanceController;
    private NotificationIconAreaController mIconAreaController;
    private final NotificationLockscreenUserManager mLockscreenUserManager;
    private final Rect mTmpRect = new Rect();
    private final FeatureFlags mFeatureFlags;
    private final NotifPipeline mNotifPipeline;
    private final NotifCollection mNotifCollection;
    private final NotificationEntryManager mEntryManager;
    private final IStatusBarService mBarService = IStatusBarService.Stub.asInterface(
            ServiceManager.getService(Context.STATUS_BAR_SERVICE));
    @VisibleForTesting
    protected final MetricsLogger mMetricsLogger = Dependency.get(MetricsLogger.class);
    protected final UiEventLogger mUiEventLogger;
    private final NotificationRemoteInputManager mRemoteInputManager =
            Dependency.get(NotificationRemoteInputManager.class);
    private final SysuiColorExtractor mColorExtractor = Dependency.get(SysuiColorExtractor.class);

    private final DisplayMetrics mDisplayMetrics = Dependency.get(DisplayMetrics.class);
    private final LockscreenGestureLogger mLockscreenGestureLogger =
            Dependency.get(LockscreenGestureLogger.class);
    private final VisualStabilityManager mVisualStabilityManager =
            Dependency.get(VisualStabilityManager.class);
    protected boolean mClearAllEnabled;

    private Interpolator mHideXInterpolator = Interpolators.FAST_OUT_SLOW_IN;
    private NotificationPanelViewController mNotificationPanelController;

    private final NotificationGutsManager mNotificationGutsManager;
    private final NotificationSectionsManager mSectionsManager;
    private final ForegroundServiceSectionController mFgsSectionController;
    private ForegroundServiceDungeonView mFgsSectionView;
    private boolean mAnimateBottomOnLayout;
    private float mLastSentAppear;
    private float mLastSentExpandedHeight;
    private boolean mWillExpand;

    private int mWaterfallTopInset;

    @Inject
    public NotificationStackScrollLayout(
            @Named(VIEW_CONTEXT) Context context,
            AttributeSet attrs,
            @Named(ALLOW_NOTIFICATION_LONG_PRESS_NAME) boolean allowLongPress,
            NotificationRoundnessManager notificationRoundnessManager,
            DynamicPrivacyController dynamicPrivacyController,
            SysuiStatusBarStateController statusBarStateController,
            HeadsUpManagerPhone headsUpManager,
            KeyguardBypassController keyguardBypassController,
            FalsingManager falsingManager,
            NotificationLockscreenUserManager notificationLockscreenUserManager,
            NotificationGutsManager notificationGutsManager,
            ZenModeController zenController,
            NotificationSectionsManager notificationSectionsManager,
            ForegroundServiceSectionController fgsSectionController,
            ForegroundServiceDismissalFeatureController fgsFeatureController,
            FeatureFlags featureFlags,
            NotifPipeline notifPipeline,
            NotificationEntryManager entryManager,
            NotifCollection notifCollection,
            UiEventLogger uiEventLogger
    ) {
        super(context, attrs, 0, 0);
        Resources res = getResources();

        mAllowLongPress = allowLongPress;

        mRoundnessManager = notificationRoundnessManager;

        mLockscreenUserManager = notificationLockscreenUserManager;
        mNotificationGutsManager = notificationGutsManager;
        mHeadsUpManager = headsUpManager;
        mHeadsUpManager.addListener(mRoundnessManager);
        mHeadsUpManager.setAnimationStateHandler(this::setHeadsUpGoingAwayAnimationsAllowed);
        mKeyguardBypassController = keyguardBypassController;
        mFalsingManager = falsingManager;
        mZenController = zenController;
        mFgsSectionController = fgsSectionController;

        mSectionsManager = notificationSectionsManager;
        mSectionsManager.initialize(this, LayoutInflater.from(context));
        mSectionsManager.setOnClearGentleNotifsClickListener(v -> {
            // Leave the shade open if there will be other notifs left over to clear
            final boolean closeShade = !hasActiveClearableNotifications(ROWS_HIGH_PRIORITY);
            clearNotifications(ROWS_GENTLE, closeShade);
        });
        mSections = mSectionsManager.createSectionsForBuckets();

        mAmbientState = new AmbientState(context, mSectionsManager, mHeadsUpManager);
        mBgColor = context.getColor(R.color.notification_shade_background_color);
        int minHeight = res.getDimensionPixelSize(R.dimen.notification_min_height);
        int maxHeight = res.getDimensionPixelSize(R.dimen.notification_max_height);
        mExpandHelper = new ExpandHelper(getContext(), mExpandHelperCallback,
                minHeight, maxHeight);
        mExpandHelper.setEventSource(this);
        mExpandHelper.setScrollAdapter(this);
        mSwipeHelper = new NotificationSwipeHelper(SwipeHelper.X, mNotificationCallback,
                getContext(), mMenuEventListener, mFalsingManager);
        mStackScrollAlgorithm = createStackScrollAlgorithm(context);
        initView(context);
        mShouldDrawNotificationBackground =
                res.getBoolean(R.bool.config_drawNotificationBackground);
        mFadeNotificationsOnDismiss =
                res.getBoolean(R.bool.config_fadeNotificationsOnDismiss);
        mRoundnessManager.setAnimatedChildren(mChildrenToAddAnimated);
        mRoundnessManager.setOnRoundingChangedCallback(this::invalidate);
        addOnExpandedHeightChangedListener(mRoundnessManager::setExpanded);
        mLockscreenUserManager.addUserChangedListener(mLockscreenUserChangeListener);
        setOutlineProvider(mOutlineProvider);

        // Blocking helper manager wants to know the expanded state, update as well.
        NotificationBlockingHelperManager blockingHelperManager =
                Dependency.get(NotificationBlockingHelperManager.class);
        addOnExpandedHeightChangedListener((height, unused) -> {
            blockingHelperManager.setNotificationShadeExpanded(height);
        });

        boolean willDraw = mShouldDrawNotificationBackground || DEBUG;
        setWillNotDraw(!willDraw);
        mBackgroundPaint.setAntiAlias(true);
        if (DEBUG) {
            mDebugPaint = new Paint();
            mDebugPaint.setColor(0xffff0000);
            mDebugPaint.setStrokeWidth(2);
            mDebugPaint.setStyle(Paint.Style.STROKE);
            mDebugPaint.setTextSize(25f);
        }
        mClearAllEnabled = res.getBoolean(R.bool.config_enableNotificationsClearAll);

        TunerService tunerService = Dependency.get(TunerService.class);
        tunerService.addTunable((key, newValue) -> {
            if (key.equals(HIGH_PRIORITY)) {
                mHighPriorityBeforeSpeedBump = "1".equals(newValue);
            } else if (key.equals(Settings.Secure.NOTIFICATION_DISMISS_RTL)) {
                updateDismissRtlSetting("1".equals(newValue));
            }
        }, HIGH_PRIORITY, Settings.Secure.NOTIFICATION_DISMISS_RTL);

        mFeatureFlags = featureFlags;
        mNotifPipeline = notifPipeline;
        mEntryManager = entryManager;
        mNotifCollection = notifCollection;
        if (mFeatureFlags.isNewNotifPipelineRenderingEnabled()) {
            mNotifPipeline.addCollectionListener(new NotifCollectionListener() {
                @Override
                public void onEntryUpdated(NotificationEntry entry) {
                    NotificationStackScrollLayout.this.onEntryUpdated(entry);
                }
            });
        } else {
            mEntryManager.addNotificationEntryListener(new NotificationEntryListener() {
                @Override
                public void onPreEntryUpdated(NotificationEntry entry) {
                    NotificationStackScrollLayout.this.onEntryUpdated(entry);
                }
            });
        }

        dynamicPrivacyController.addListener(this);
        mDynamicPrivacyController = dynamicPrivacyController;
        mStatusbarStateController = statusBarStateController;
        initializeForegroundServiceSection(fgsFeatureController);
        mUiEventLogger = uiEventLogger;
    }

    private void initializeForegroundServiceSection(
            ForegroundServiceDismissalFeatureController featureController) {
        if (featureController.isForegroundServiceDismissalEnabled()) {
            LayoutInflater li = LayoutInflater.from(mContext);
            mFgsSectionView =
                    (ForegroundServiceDungeonView) mFgsSectionController.createView(li);
            addView(mFgsSectionView, -1);
        }
    }

    private void updateDismissRtlSetting(boolean dismissRtl) {
        mDismissRtl = dismissRtl;
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            if (child instanceof ExpandableNotificationRow) {
                ((ExpandableNotificationRow) child).setDismissRtl(dismissRtl);
            }
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    protected void onFinishInflate() {
        super.onFinishInflate();

        inflateEmptyShadeView();
        inflateFooterView();
        mVisualStabilityManager.setVisibilityLocationProvider(this::isInVisibleLocation);
        if (mAllowLongPress) {
            setLongPressListener(mNotificationGutsManager::openGuts);
        }
    }

    /**
     * @return the height at which we will wake up when pulsing
     */
    public float getWakeUpHeight() {
        ActivatableNotificationView firstChild = getFirstChildWithBackground();
        if (firstChild != null) {
            if (mKeyguardBypassController.getBypassEnabled()) {
                return firstChild.getHeadsUpHeightWithoutHeader();
            } else {
                return firstChild.getCollapsedHeight();
            }
        }
        return 0f;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void onDensityOrFontScaleChanged() {
        reinflateViews();
    }

    private void reinflateViews() {
        inflateFooterView();
        inflateEmptyShadeView();
        updateFooter();
        mSectionsManager.reinflateViews(LayoutInflater.from(mContext));
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void onThemeChanged() {
        final boolean useDarkText = mColorExtractor.getNeutralColors().supportsDarkText();
        updateDecorViews(useDarkText);

        updateFooter();
    }

    @Override
    public void onOverlayChanged() {
        int newRadius = mContext.getResources().getDimensionPixelSize(
                Utils.getThemeAttr(mContext, android.R.attr.dialogCornerRadius));
        if (mCornerRadius != newRadius) {
            mCornerRadius = newRadius;
            invalidate();
        }
        reinflateViews();
    }

    @VisibleForTesting
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void updateFooter() {
        boolean showDismissView = mClearAllEnabled && hasActiveClearableNotifications(ROWS_ALL);
        boolean showFooterView = (showDismissView || hasActiveNotifications())
                && mStatusBarState != StatusBarState.KEYGUARD
                && !mRemoteInputManager.getController().isRemoteInputActive();

        updateFooterView(showFooterView, showDismissView);
    }

    /**
     * Return whether there are any clearable notifications
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean hasActiveClearableNotifications(@SelectedRows int selection) {
        if (mDynamicPrivacyController.isInLockedDownShade()) {
            return false;
        }
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            if (!(child instanceof ExpandableNotificationRow)) {
                continue;
            }
            final ExpandableNotificationRow row = (ExpandableNotificationRow) child;
            if (row.canViewBeDismissed() && matchesSelection(row, selection)) {
                return true;
            }
        }
        return false;
    }

  @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
  public RemoteInputController.Delegate createDelegate() {
        return new RemoteInputController.Delegate() {
            public void setRemoteInputActive(NotificationEntry entry,
                    boolean remoteInputActive) {
                mHeadsUpManager.setRemoteInputActive(entry, remoteInputActive);
                entry.notifyHeightChanged(true /* needsAnimation */);
                updateFooter();
            }

            public void lockScrollTo(NotificationEntry entry) {
                NotificationStackScrollLayout.this.lockScrollTo(entry.getRow());
            }

            public void requestDisallowLongPressAndDismiss() {
                requestDisallowLongPress();
                requestDisallowDismiss();
            }
        };
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        ((SysuiStatusBarStateController) Dependency.get(StatusBarStateController.class))
                .addCallback(mStateListener, SysuiStatusBarStateController.RANK_STACK_SCROLLER);
        Dependency.get(ConfigurationController.class).addCallback(this);
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        Dependency.get(StatusBarStateController.class).removeCallback(mStateListener);
        Dependency.get(ConfigurationController.class).removeCallback(this);
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public NotificationSwipeActionHelper getSwipeActionHelper() {
        return mSwipeHelper;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void onUiModeChanged() {
        mBgColor = mContext.getColor(R.color.notification_shade_background_color);
        updateBackgroundDimming();
        mShelf.onUiModeChanged();
    }

    @ShadeViewRefactor(RefactorComponent.DECORATOR)
    protected void onDraw(Canvas canvas) {
        if (mShouldDrawNotificationBackground
                && (mSections[0].getCurrentBounds().top
                < mSections[mSections.length - 1].getCurrentBounds().bottom
                || mAmbientState.isDozing())) {
            drawBackground(canvas);
        } else if (mInHeadsUpPinnedMode || mHeadsUpAnimatingAway) {
            drawHeadsUpBackground(canvas);
        }

        if (DEBUG) {
            int y = mTopPadding;
            canvas.drawLine(0, y, getWidth(), y, mDebugPaint);
            y = getLayoutHeight();
            canvas.drawLine(0, y, getWidth(), y, mDebugPaint);
            y = getHeight() - getEmptyBottomMargin();
            canvas.drawLine(0, y, getWidth(), y, mDebugPaint);
        }
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);

        if (DEBUG && ANCHOR_SCROLLING) {
            if (mScrollAnchorView instanceof ExpandableNotificationRow) {
                canvas.drawRect(0,
                        mScrollAnchorView.getTranslationY(),
                        getWidth(),
                        mScrollAnchorView.getTranslationY()
                                + ((ExpandableNotificationRow) mScrollAnchorView).getActualHeight(),
                        mDebugPaint);
                canvas.drawText(Integer.toString(mScrollAnchorViewY), getWidth() - 200,
                        mScrollAnchorView.getTranslationY() + 30, mDebugPaint);
                int y = (int) mShelf.getTranslationY();
                canvas.drawLine(0, y, getWidth(), y, mDebugPaint);
            }
            canvas.drawText(Integer.toString(getMaxNegativeScrollAmount()), getWidth() - 100,
                    getTopPadding() + 30, mDebugPaint);
            canvas.drawText(Integer.toString(getMaxPositiveScrollAmount()), getWidth() - 100,
                    getHeight() - 30, mDebugPaint);
        }
    }

    @ShadeViewRefactor(RefactorComponent.DECORATOR)
    private void drawBackground(Canvas canvas) {
        int lockScreenLeft = mSidePaddings;
        int lockScreenRight = getWidth() - mSidePaddings;
        int lockScreenTop = mSections[0].getCurrentBounds().top;
        int lockScreenBottom = mSections[mSections.length - 1].getCurrentBounds().bottom;
        int hiddenLeft = getWidth() / 2;
        int hiddenTop = mTopPadding;

        float yProgress = 1 - mInterpolatedHideAmount;
        float xProgress = mHideXInterpolator.getInterpolation(
                (1 - mLinearHideAmount) * mBackgroundXFactor);

        int left = (int) MathUtils.lerp(hiddenLeft, lockScreenLeft, xProgress);
        int right = (int) MathUtils.lerp(hiddenLeft, lockScreenRight, xProgress);
        int top = (int) MathUtils.lerp(hiddenTop, lockScreenTop, yProgress);
        int bottom = (int) MathUtils.lerp(hiddenTop, lockScreenBottom, yProgress);
        mBackgroundAnimationRect.set(
                left,
                top,
                right,
                bottom);

        int backgroundTopAnimationOffset = top - lockScreenTop;
        // TODO(kprevas): this may not be necessary any more since we don't display the shelf in AOD
        boolean anySectionHasVisibleChild = false;
        for (NotificationSection section : mSections) {
            if (section.getFirstVisibleChild() != null) {
                anySectionHasVisibleChild = true;
                break;
            }
        }
        boolean shouldDrawBackground;
        if (mKeyguardBypassController.getBypassEnabled() && onKeyguard()) {
            shouldDrawBackground = isPulseExpanding();
        } else {
            shouldDrawBackground = !mAmbientState.isDozing() || anySectionHasVisibleChild;
        }
        if (shouldDrawBackground) {
            drawBackgroundRects(canvas, left, right, top, backgroundTopAnimationOffset);
        }

        updateClipping();
    }

    /**
     * Draws round rects for each background section.
     *
     * We want to draw a round rect for each background section as defined by {@link #mSections}.
     * However, if two sections are directly adjacent with no gap between them (e.g. on the
     * lockscreen where the shelf can appear directly below the high priority section, or while
     * scrolling the shade so that the top of the shelf is right at the bottom of the high priority
     * section), we don't want to round the adjacent corners.
     *
     * Since {@link Canvas} doesn't provide a way to draw a half-rounded rect, this means that we
     * need to coalesce the backgrounds for adjacent sections and draw them as a single round rect.
     * This method tracks the top of each rect we need to draw, then iterates through the visible
     * sections.  If a section is not adjacent to the previous section, we draw the previous rect
     * behind the sections we've accumulated up to that point, then start a new rect at the top of
     * the current section.  When we're done iterating we will always have one rect left to draw.
     */
    private void drawBackgroundRects(Canvas canvas, int left, int right, int top,
            int animationYOffset) {
        int backgroundRectTop = top;
        int lastSectionBottom =
                mSections[0].getCurrentBounds().bottom + animationYOffset;
        int currentLeft = left;
        int currentRight = right;
        boolean first = true;
        for (NotificationSection section : mSections) {
            if (section.getFirstVisibleChild() == null) {
                continue;
            }
            int sectionTop = section.getCurrentBounds().top + animationYOffset;
            int ownLeft = Math.min(Math.max(left, section.getCurrentBounds().left), right);
            int ownRight = Math.max(Math.min(right, section.getCurrentBounds().right), ownLeft);
            // If sections are directly adjacent to each other, we don't want to draw them
            // as separate roundrects, as the rounded corners right next to each other look
            // bad.
            if (sectionTop - lastSectionBottom > DISTANCE_BETWEEN_ADJACENT_SECTIONS_PX
                    || ((currentLeft != ownLeft || currentRight != ownRight) && !first)) {
                canvas.drawRoundRect(currentLeft,
                        backgroundRectTop,
                        currentRight,
                        lastSectionBottom,
                        mCornerRadius, mCornerRadius, mBackgroundPaint);
                backgroundRectTop = sectionTop;
            }
            currentLeft = ownLeft;
            currentRight = ownRight;
            lastSectionBottom =
                    section.getCurrentBounds().bottom + animationYOffset;
            first = false;
        }
        canvas.drawRoundRect(currentLeft,
                backgroundRectTop,
                currentRight,
                lastSectionBottom,
                mCornerRadius, mCornerRadius, mBackgroundPaint);
    }

    private void drawHeadsUpBackground(Canvas canvas) {
        int left = mSidePaddings;
        int right = getWidth() - mSidePaddings;

        float top = getHeight();
        float bottom = 0;
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != View.GONE
                    && child instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) child;
                if ((row.isPinned() || row.isHeadsUpAnimatingAway()) && row.getTranslation() < 0
                        && row.getProvider().shouldShowGutsOnSnapOpen()) {
                    top = Math.min(top, row.getTranslationY());
                    bottom = Math.max(bottom, row.getTranslationY() + row.getActualHeight());
                }
            }
        }

        if (top < bottom) {
            canvas.drawRoundRect(
                    left, top, right, bottom,
                    mCornerRadius, mCornerRadius, mBackgroundPaint);
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void updateBackgroundDimming() {
        // No need to update the background color if it's not being drawn.
        if (!mShouldDrawNotificationBackground) {
            return;
        }

        // Interpolate between semi-transparent notification panel background color
        // and white AOD separator.
        float colorInterpolation = MathUtils.smoothStep(0.4f /* start */, 1f /* end */,
                mLinearHideAmount);
        int color = ColorUtils.blendARGB(mBgColor, Color.WHITE, colorInterpolation);

        if (mCachedBackgroundColor != color) {
            mCachedBackgroundColor = color;
            mBackgroundPaint.setColor(color);
            invalidate();
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void initView(Context context) {
        mScroller = new OverScroller(getContext());
        setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
        setClipChildren(false);
        final ViewConfiguration configuration = ViewConfiguration.get(context);
        mTouchSlop = configuration.getScaledTouchSlop();
        mSlopMultiplier = configuration.getScaledAmbiguousGestureMultiplier();
        mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
        mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
        mOverflingDistance = configuration.getScaledOverflingDistance();

        Resources res = context.getResources();
        mCollapsedSize = res.getDimensionPixelSize(R.dimen.notification_min_height);
        mStackScrollAlgorithm.initView(context);
        mAmbientState.reload(context);
        mPaddingBetweenElements = Math.max(1,
                res.getDimensionPixelSize(R.dimen.notification_divider_height));
        mIncreasedPaddingBetweenElements =
                res.getDimensionPixelSize(R.dimen.notification_divider_height_increased);
        mMinTopOverScrollToEscape = res.getDimensionPixelSize(
                R.dimen.min_top_overscroll_to_qs);
        mStatusBarHeight = res.getDimensionPixelSize(R.dimen.status_bar_height);
        mBottomMargin = res.getDimensionPixelSize(R.dimen.notification_panel_margin_bottom);
        mSidePaddings = res.getDimensionPixelSize(R.dimen.notification_side_paddings);
        mMinInteractionHeight = res.getDimensionPixelSize(
                R.dimen.notification_min_interaction_height);
        mCornerRadius = res.getDimensionPixelSize(
                Utils.getThemeAttr(mContext, android.R.attr.dialogCornerRadius));
        mHeadsUpInset = mStatusBarHeight + res.getDimensionPixelSize(
                R.dimen.heads_up_status_bar_padding);
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void notifyHeightChangeListener(ExpandableView view) {
        notifyHeightChangeListener(view, false /* needsAnimation */);
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void notifyHeightChangeListener(ExpandableView view, boolean needsAnimation) {
        if (mOnHeightChangedListener != null) {
            mOnHeightChangedListener.onHeightChanged(view, needsAnimation);
        }
    }

    public boolean isPulseExpanding() {
        return mAmbientState.isPulseExpanding();
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int width = MeasureSpec.getSize(widthMeasureSpec);
        int childWidthSpec = MeasureSpec.makeMeasureSpec(width - mSidePaddings * 2,
                MeasureSpec.getMode(widthMeasureSpec));
        // Don't constrain the height of the children so we know how big they'd like to be
        int childHeightSpec = MeasureSpec.makeMeasureSpec(MeasureSpec.getSize(heightMeasureSpec),
                MeasureSpec.UNSPECIFIED);

        // We need to measure all children even the GONE ones, such that the heights are calculated
        // correctly as they are used to calculate how many we can fit on the screen.
        final int size = getChildCount();
        for (int i = 0; i < size; i++) {
            measureChild(getChildAt(i), childWidthSpec, childHeightSpec);
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        // we layout all our children centered on the top
        float centerX = getWidth() / 2.0f;
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            // We need to layout all children even the GONE ones, such that the heights are
            // calculated correctly as they are used to calculate how many we can fit on the screen
            float width = child.getMeasuredWidth();
            float height = child.getMeasuredHeight();
            child.layout((int) (centerX - width / 2.0f),
                    0,
                    (int) (centerX + width / 2.0f),
                    (int) height);
        }
        setMaxLayoutHeight(getHeight());
        updateContentHeight();
        clampScrollPosition();
        requestChildrenUpdate();
        updateFirstAndLastBackgroundViews();
        updateAlgorithmLayoutMinHeight();
        updateOwnTranslationZ();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void requestAnimationOnViewResize(ExpandableNotificationRow row) {
        if (mAnimationsEnabled && (mIsExpanded || row != null && row.isPinned())) {
            mNeedViewResizeAnimation = true;
            mNeedsAnimation = true;
        }
    }

    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    public void updateSpeedBumpIndex(int newIndex, boolean noAmbient) {
        mAmbientState.setSpeedBumpIndex(newIndex);
        mNoAmbient = noAmbient;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void setChildLocationsChangedListener(
            NotificationLogger.OnChildLocationsChangedListener listener) {
        mListener = listener;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.LAYOUT_ALGORITHM)
    public boolean isInVisibleLocation(NotificationEntry entry) {
        ExpandableNotificationRow row = entry.getRow();
        ExpandableViewState childViewState = row.getViewState();

        if (childViewState == null) {
            return false;
        }
        if ((childViewState.location & ExpandableViewState.VISIBLE_LOCATIONS) == 0) {
            return false;
        }
        if (row.getVisibility() != View.VISIBLE) {
            return false;
        }
        return true;
    }

    @ShadeViewRefactor(RefactorComponent.LAYOUT_ALGORITHM)
    private void setMaxLayoutHeight(int maxLayoutHeight) {
        mMaxLayoutHeight = maxLayoutHeight;
        mShelf.setMaxLayoutHeight(maxLayoutHeight);
        updateAlgorithmHeightAndPadding();
    }

    @ShadeViewRefactor(RefactorComponent.LAYOUT_ALGORITHM)
    private void updateAlgorithmHeightAndPadding() {
        mAmbientState.setLayoutHeight(getLayoutHeight());
        updateAlgorithmLayoutMinHeight();
        mAmbientState.setTopPadding(mTopPadding);
    }

    @ShadeViewRefactor(RefactorComponent.LAYOUT_ALGORITHM)
    private void updateAlgorithmLayoutMinHeight() {
        mAmbientState.setLayoutMinHeight(mQsExpanded || isHeadsUpTransition()
                ? getLayoutMinHeight() : 0);
    }

    /**
     * Updates the children views according to the stack scroll algorithm. Call this whenever
     * modifications to {@link #mOwnScrollY} are performed to reflect it in the view layout.
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateChildren() {
        updateScrollStateForAddedChildren();
        mAmbientState.setCurrentScrollVelocity(mScroller.isFinished()
                ? 0
                : mScroller.getCurrVelocity());
        if (ANCHOR_SCROLLING) {
            mAmbientState.setAnchorViewIndex(indexOfChild(mScrollAnchorView));
            mAmbientState.setAnchorViewY(mScrollAnchorViewY);
        } else {
            mAmbientState.setScrollY(mOwnScrollY);
        }
        mStackScrollAlgorithm.resetViewStates(mAmbientState);
        if (!isCurrentlyAnimating() && !mNeedsAnimation) {
            applyCurrentState();
        } else {
            startAnimationToState();
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void onPreDrawDuringAnimation() {
        mShelf.updateAppearance();
        updateClippingToTopRoundedCorner();
        if (!mNeedsAnimation && !mChildrenUpdateRequested) {
            updateBackground();
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void updateClippingToTopRoundedCorner() {
        Float clipStart = (float) mTopPadding
                + mStackTranslation
                + mAmbientState.getExpandAnimationTopChange();
        Float clipEnd = clipStart + mCornerRadius;
        boolean first = true;
        for (int i = 0; i < getChildCount(); i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            if (child.getVisibility() == GONE) {
                continue;
            }
            float start = child.getTranslationY();
            float end = start + child.getActualHeight();
            boolean clip = clipStart > start && clipStart < end
                    || clipEnd >= start && clipEnd <= end;
            clip &= !(first && isScrolledToTop());
            child.setDistanceToTopRoundness(clip ? Math.max(start - clipStart, 0)
                    : ExpandableView.NO_ROUNDNESS);
            first = false;
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateScrollStateForAddedChildren() {
        if (mChildrenToAddAnimated.isEmpty()) {
            return;
        }
        if (!ANCHOR_SCROLLING) {
            for (int i = 0; i < getChildCount(); i++) {
                ExpandableView child = (ExpandableView) getChildAt(i);
                if (mChildrenToAddAnimated.contains(child)) {
                    int startingPosition = getPositionInLinearLayout(child);
                    float increasedPaddingAmount = child.getIncreasedPaddingAmount();
                    int padding = increasedPaddingAmount == 1.0f ? mIncreasedPaddingBetweenElements
                            : increasedPaddingAmount == -1.0f ? 0 : mPaddingBetweenElements;
                    int childHeight = getIntrinsicHeight(child) + padding;
                    if (startingPosition < mOwnScrollY) {
                        // This child starts off screen, so let's keep it offscreen to keep the
                        // others visible

                        setOwnScrollY(mOwnScrollY + childHeight);
                    }
                }
            }
        }
        clampScrollPosition();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void updateForcedScroll() {
        if (mForcedScroll != null && (!mForcedScroll.hasFocus()
                || !mForcedScroll.isAttachedToWindow())) {
            mForcedScroll = null;
        }
        if (mForcedScroll != null) {
            ExpandableView expandableView = (ExpandableView) mForcedScroll;
            int positionInLinearLayout = getPositionInLinearLayout(expandableView);
            int targetScroll = targetScrollForView(expandableView, positionInLinearLayout);
            int outOfViewScroll = positionInLinearLayout + expandableView.getIntrinsicHeight();

            if (ANCHOR_SCROLLING) {
                // TODO
            } else {
                targetScroll = Math.max(0, Math.min(targetScroll, getScrollRange()));

                // Only apply the scroll if we're scrolling the view upwards, or the view is so
                // far up that it is not visible anymore.
                if (mOwnScrollY < targetScroll || outOfViewScroll < mOwnScrollY) {
                    setOwnScrollY(targetScroll);
                }
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void requestChildrenUpdate() {
        if (!mChildrenUpdateRequested) {
            getViewTreeObserver().addOnPreDrawListener(mChildrenUpdater);
            mChildrenUpdateRequested = true;
            invalidate();
        }
    }

    /**
     * Returns best effort count of visible notifications.
     */
    public int getVisibleNotificationCount() {
        int count = 0;
        for (int i = 0; i < getChildCount(); i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != View.GONE && child instanceof ExpandableNotificationRow) {
                count++;
            }
        }
        return count;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private boolean isCurrentlyAnimating() {
        return mStateAnimator.isRunning();
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void clampScrollPosition() {
        if (ANCHOR_SCROLLING) {
            // TODO
        } else {
            int scrollRange = getScrollRange();
            if (scrollRange < mOwnScrollY) {
                setOwnScrollY(scrollRange);
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public int getTopPadding() {
        return mTopPadding;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void setTopPadding(int topPadding, boolean animate) {
        if (mTopPadding != topPadding) {
            mTopPadding = topPadding;
            updateAlgorithmHeightAndPadding();
            updateContentHeight();
            if (animate && mAnimationsEnabled && mIsExpanded) {
                mTopPaddingNeedsAnimation = true;
                mNeedsAnimation = true;
            }
            requestChildrenUpdate();
            notifyHeightChangeListener(null, animate);
        }
    }

    /**
     * Update the height of the panel.
     *
     * @param height the expanded height of the panel
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public void setExpandedHeight(float height) {
        mExpandedHeight = height;
        setIsExpanded(height > 0);
        int minExpansionHeight = getMinExpansionHeight();
        if (height < minExpansionHeight) {
            mClipRect.left = 0;
            mClipRect.right = getWidth();
            mClipRect.top = 0;
            mClipRect.bottom = (int) height;
            height = minExpansionHeight;
            setRequestedClipBounds(mClipRect);
        } else {
            setRequestedClipBounds(null);
        }
        int stackHeight;
        float translationY;
        float appearEndPosition = getAppearEndPosition();
        float appearStartPosition = getAppearStartPosition();
        float appearFraction = 1.0f;
        boolean appearing = height < appearEndPosition;
        mAmbientState.setAppearing(appearing);
        if (!appearing) {
            translationY = 0;
            if (mShouldShowShelfOnly) {
                stackHeight = mTopPadding + mShelf.getIntrinsicHeight();
            } else if (mQsExpanded) {
                int stackStartPosition = mContentHeight - mTopPadding + mIntrinsicPadding;
                int stackEndPosition = mMaxTopPadding + mShelf.getIntrinsicHeight();
                if (stackStartPosition <= stackEndPosition) {
                    stackHeight = stackEndPosition;
                } else {
                    stackHeight = (int) NotificationUtils.interpolate(stackStartPosition,
                            stackEndPosition, mQsExpansionFraction);
                }
            } else {
                stackHeight = (int) height;
            }
        } else {
            appearFraction = calculateAppearFraction(height);
            if (appearFraction >= 0) {
                translationY = NotificationUtils.interpolate(getExpandTranslationStart(), 0,
                        appearFraction);
            } else {
                // This may happen when pushing up a heads up. We linearly push it up from the
                // start
                translationY = height - appearStartPosition + getExpandTranslationStart();
            }
            if (isHeadsUpTransition()) {
                stackHeight =
                        getFirstVisibleSection().getFirstVisibleChild().getPinnedHeadsUpHeight();
                translationY = MathUtils.lerp(mHeadsUpInset - mTopPadding, 0, appearFraction);
            } else {
                stackHeight = (int) (height - translationY);
            }
        }
        if (stackHeight != mCurrentStackHeight) {
            mCurrentStackHeight = stackHeight;
            updateAlgorithmHeightAndPadding();
            requestChildrenUpdate();
        }
        setStackTranslation(translationY);
        notifyAppearChangedListeners();
    }

    private void notifyAppearChangedListeners() {
        float appear;
        float expandAmount;
        if (mKeyguardBypassController.getBypassEnabled() && onKeyguard()) {
            appear = calculateAppearFractionBypass();
            expandAmount = getPulseHeight();
        } else {
            appear = MathUtils.saturate(calculateAppearFraction(mExpandedHeight));
            expandAmount = mExpandedHeight;
        }
        if (appear != mLastSentAppear || expandAmount != mLastSentExpandedHeight) {
            mLastSentAppear = appear;
            mLastSentExpandedHeight = expandAmount;
            for (int i = 0; i < mExpandedHeightListeners.size(); i++) {
                BiConsumer<Float, Float> listener = mExpandedHeightListeners.get(i);
                listener.accept(expandAmount, appear);
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void setRequestedClipBounds(Rect clipRect) {
        mRequestedClipBounds = clipRect;
        updateClipping();
    }

    /**
     * Return the height of the content ignoring the footer.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public int getIntrinsicContentHeight() {
        return mIntrinsicContentHeight;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void updateClipping() {
        boolean clipped = mRequestedClipBounds != null && !mInHeadsUpPinnedMode
                && !mHeadsUpAnimatingAway;
        boolean clipToOutline = false;
        if (mIsClipped != clipped) {
            mIsClipped = clipped;
        }

        if (mAmbientState.isHiddenAtAll()) {
            clipToOutline = true;
            invalidateOutline();
            if (isFullyHidden()) {
                setClipBounds(null);
            }
        } else if (clipped) {
            setClipBounds(mRequestedClipBounds);
        } else {
            setClipBounds(null);
        }

        setClipToOutline(clipToOutline);
    }

    /**
     * @return The translation at the beginning when expanding.
     * Measured relative to the resting position.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private float getExpandTranslationStart() {
        return -mTopPadding + getMinExpansionHeight() - mShelf.getIntrinsicHeight();
    }

    /**
     * @return the position from where the appear transition starts when expanding.
     * Measured in absolute height.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private float getAppearStartPosition() {
        if (isHeadsUpTransition()) {
            return mHeadsUpInset
                    + getFirstVisibleSection().getFirstVisibleChild().getPinnedHeadsUpHeight();
        }
        return getMinExpansionHeight();
    }

    /**
     * @return the height of the top heads up notification when pinned. This is different from the
     * intrinsic height, which also includes whether the notification is system expanded and
     * is mainly used when dragging down from a heads up notification.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private int getTopHeadsUpPinnedHeight() {
        NotificationEntry topEntry = mHeadsUpManager.getTopEntry();
        if (topEntry == null) {
            return 0;
        }
        ExpandableNotificationRow row = topEntry.getRow();
        if (row.isChildInGroup()) {
            final NotificationEntry groupSummary =
                    mGroupManager.getGroupSummary(row.getEntry().getSbn());
            if (groupSummary != null) {
                row = groupSummary.getRow();
            }
        }
        return row.getPinnedHeadsUpHeight();
    }

    /**
     * @return the position from where the appear transition ends when expanding.
     * Measured in absolute height.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private float getAppearEndPosition() {
        int appearPosition;
        int notGoneChildCount = getNotGoneChildCount();
        if (mEmptyShadeView.getVisibility() == GONE && notGoneChildCount != 0) {
            if (isHeadsUpTransition()
                    || (mHeadsUpManager.hasPinnedHeadsUp() && !mAmbientState.isDozing())) {
                appearPosition = getTopHeadsUpPinnedHeight();
            } else {
                appearPosition = 0;
                if (notGoneChildCount >= 1 && mShelf.getVisibility() != GONE) {
                    appearPosition += mShelf.getIntrinsicHeight();
                }
            }
        } else {
            appearPosition = mEmptyShadeView.getHeight();
        }
        return appearPosition + (onKeyguard() ? mTopPadding : mIntrinsicPadding);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private boolean isHeadsUpTransition() {
        NotificationSection firstVisibleSection = getFirstVisibleSection();
        return mTrackingHeadsUp && firstVisibleSection != null
                && firstVisibleSection.getFirstVisibleChild().isAboveShelf();
    }

    /**
     * @param height the height of the panel
     * @return the fraction of the appear animation that has been performed
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public float calculateAppearFraction(float height) {
        float appearEndPosition = getAppearEndPosition();
        float appearStartPosition = getAppearStartPosition();
        return (height - appearStartPosition)
                / (appearEndPosition - appearStartPosition);
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public float getStackTranslation() {
        return mStackTranslation;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void setStackTranslation(float stackTranslation) {
        if (stackTranslation != mStackTranslation) {
            mStackTranslation = stackTranslation;
            mAmbientState.setStackTranslation(stackTranslation);
            requestChildrenUpdate();
        }
    }

    /**
     * Get the current height of the view. This is at most the msize of the view given by a the
     * layout but it can also be made smaller by setting {@link #mCurrentStackHeight}
     *
     * @return either the layout height or the externally defined height, whichever is smaller
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private int getLayoutHeight() {
        return Math.min(mMaxLayoutHeight, mCurrentStackHeight);
    }

    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    public int getFirstItemMinHeight() {
        final ExpandableView firstChild = getFirstChildNotGone();
        return firstChild != null ? firstChild.getMinHeight() : mCollapsedSize;
    }

    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    public void setQsContainer(ViewGroup qsContainer) {
        mQsContainer = qsContainer;
    }

    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    public static boolean isPinnedHeadsUp(View v) {
        if (v instanceof ExpandableNotificationRow) {
            ExpandableNotificationRow row = (ExpandableNotificationRow) v;
            return row.isHeadsUp() && row.isPinned();
        }
        return false;
    }

    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    private boolean isHeadsUp(View v) {
        if (v instanceof ExpandableNotificationRow) {
            ExpandableNotificationRow row = (ExpandableNotificationRow) v;
            return row.isHeadsUp();
        }
        return false;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public ExpandableView getClosestChildAtRawPosition(float touchX, float touchY) {
        getLocationOnScreen(mTempInt2);
        float localTouchY = touchY - mTempInt2[1];

        ExpandableView closestChild = null;
        float minDist = Float.MAX_VALUE;

        // find the view closest to the location, accounting for GONE views
        final int count = getChildCount();
        for (int childIdx = 0; childIdx < count; childIdx++) {
            ExpandableView slidingChild = (ExpandableView) getChildAt(childIdx);
            if (slidingChild.getVisibility() == GONE
                    || slidingChild instanceof StackScrollerDecorView) {
                continue;
            }
            float childTop = slidingChild.getTranslationY();
            float top = childTop + slidingChild.getClipTopAmount();
            float bottom = childTop + slidingChild.getActualHeight()
                    - slidingChild.getClipBottomAmount();

            float dist = Math.min(Math.abs(top - localTouchY), Math.abs(bottom - localTouchY));
            if (dist < minDist) {
                closestChild = slidingChild;
                minDist = dist;
            }
        }
        return closestChild;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private ExpandableView getChildAtPosition(float touchX, float touchY) {
        return getChildAtPosition(
                touchX, touchY, true /* requireMinHeight */, true /* ignoreDecors */);
    }

    /**
     * Get the child at a certain screen location.
     *
     * @param touchX           the x coordinate
     * @param touchY           the y coordinate
     * @param requireMinHeight Whether a minimum height is required for a child to be returned.
     * @param ignoreDecors     Whether decors can be returned
     * @return the child at the given location.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private ExpandableView getChildAtPosition(float touchX, float touchY,
            boolean requireMinHeight, boolean ignoreDecors) {
        // find the view under the pointer, accounting for GONE views
        final int count = getChildCount();
        for (int childIdx = 0; childIdx < count; childIdx++) {
            ExpandableView slidingChild = (ExpandableView) getChildAt(childIdx);
            if (slidingChild.getVisibility() != VISIBLE
                    || (ignoreDecors && slidingChild instanceof StackScrollerDecorView)) {
                continue;
            }
            float childTop = slidingChild.getTranslationY();
            float top = childTop + slidingChild.getClipTopAmount();
            float bottom = childTop + slidingChild.getActualHeight()
                    - slidingChild.getClipBottomAmount();

            // Allow the full width of this view to prevent gesture conflict on Keyguard (phone and
            // camera affordance).
            int left = 0;
            int right = getWidth();

            if ((bottom - top >= mMinInteractionHeight || !requireMinHeight)
                    && touchY >= top && touchY <= bottom && touchX >= left && touchX <= right) {
                if (slidingChild instanceof ExpandableNotificationRow) {
                    ExpandableNotificationRow row = (ExpandableNotificationRow) slidingChild;
                    NotificationEntry entry = row.getEntry();
                    if (!mIsExpanded && row.isHeadsUp() && row.isPinned()
                            && mHeadsUpManager.getTopEntry().getRow() != row
                            && mGroupManager.getGroupSummary(
                            mHeadsUpManager.getTopEntry().getSbn())
                            != entry) {
                        continue;
                    }
                    return row.getViewAtPosition(touchY - childTop);
                }
                return slidingChild;
            }
        }
        return null;
    }

    public ExpandableView getChildAtRawPosition(float touchX, float touchY) {
        getLocationOnScreen(mTempInt2);
        return getChildAtPosition(touchX - mTempInt2[0], touchY - mTempInt2[1]);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setScrollingEnabled(boolean enable) {
        mScrollingEnabled = enable;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void lockScrollTo(View v) {
        if (mForcedScroll == v) {
            return;
        }
        mForcedScroll = v;
        scrollTo(v);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean scrollTo(View v) {
        ExpandableView expandableView = (ExpandableView) v;
        if (ANCHOR_SCROLLING) {
            // TODO
        } else {
            int positionInLinearLayout = getPositionInLinearLayout(v);
            int targetScroll = targetScrollForView(expandableView, positionInLinearLayout);
            int outOfViewScroll = positionInLinearLayout + expandableView.getIntrinsicHeight();

            // Only apply the scroll if we're scrolling the view upwards, or the view is so far up
            // that it is not visible anymore.
            if (mOwnScrollY < targetScroll || outOfViewScroll < mOwnScrollY) {
                mScroller.startScroll(mScrollX, mOwnScrollY, 0, targetScroll - mOwnScrollY);
                mDontReportNextOverScroll = true;
                animateScroll();
                return true;
            }
        }
        return false;
    }

    /**
     * @return the scroll necessary to make the bottom edge of {@param v} align with the top of
     * the IME.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private int targetScrollForView(ExpandableView v, int positionInLinearLayout) {
        return positionInLinearLayout + v.getIntrinsicHeight() +
                getImeInset() - getHeight()
                + ((!isExpanded() && isPinnedHeadsUp(v)) ? mHeadsUpInset : getTopPadding());
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public WindowInsets onApplyWindowInsets(WindowInsets insets) {
        mBottomInset = insets.getSystemWindowInsetBottom();

        mWaterfallTopInset = 0;
        final DisplayCutout cutout = insets.getDisplayCutout();
        if (cutout != null) {
            mWaterfallTopInset = cutout.getWaterfallInsets().top;
        }

        if (ANCHOR_SCROLLING) {
            // TODO
        } else {
            int range = getScrollRange();
            if (mOwnScrollY > range) {
                // HACK: We're repeatedly getting staggered insets here while the IME is
                // animating away. To work around that we'll wait until things have settled.
                removeCallbacks(mReclamp);
                postDelayed(mReclamp, 50);
            } else if (mForcedScroll != null) {
                // The scroll was requested before we got the actual inset - in case we need
                // to scroll up some more do so now.
                scrollTo(mForcedScroll);
            }
        }
        return insets;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private Runnable mReclamp = new Runnable() {
        @Override
        public void run() {
            if (ANCHOR_SCROLLING) {
                // TODO
            } else {
                int range = getScrollRange();
                mScroller.startScroll(mScrollX, mOwnScrollY, 0, range - mOwnScrollY);
            }
            mDontReportNextOverScroll = true;
            mDontClampNextScroll = true;
            animateScroll();
        }
    };

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setExpandingEnabled(boolean enable) {
        mExpandHelper.setEnabled(enable);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private boolean isScrollingEnabled() {
        return mScrollingEnabled;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private boolean onKeyguard() {
        return mStatusBarState == StatusBarState.KEYGUARD;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    protected void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        mStatusBarHeight = getResources().getDimensionPixelOffset(R.dimen.status_bar_height);
        float densityScale = getResources().getDisplayMetrics().density;
        mSwipeHelper.setDensityScale(densityScale);
        float pagingTouchSlop = ViewConfiguration.get(getContext()).getScaledPagingTouchSlop();
        mSwipeHelper.setPagingTouchSlop(pagingTouchSlop);
        initView(getContext());
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void dismissViewAnimated(View child, Runnable endRunnable, int delay, long duration) {
        mSwipeHelper.dismissChild(child, 0, endRunnable, delay, true, duration,
                true /* isDismissAll */);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void snapViewIfNeeded(NotificationEntry entry) {
        ExpandableNotificationRow child = entry.getRow();
        boolean animate = mIsExpanded || isPinnedHeadsUp(child);
        // If the child is showing the notification menu snap to that
        if (child.getProvider() != null) {
            float targetLeft = child.getProvider().isMenuVisible() ? child.getTranslation() : 0;
            mSwipeHelper.snapChildIfNeeded(child, animate, targetLeft);
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    public ViewGroup getViewParentForNotification(NotificationEntry entry) {
        return this;
    }

    /**
     * Perform a scroll upwards and adapt the overscroll amounts accordingly
     *
     * @param deltaY The amount to scroll upwards, has to be positive.
     * @return The amount of scrolling to be performed by the scroller,
     * not handled by the overScroll amount.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private float overScrollUp(int deltaY, int range) {
        deltaY = Math.max(deltaY, 0);
        float currentTopAmount = getCurrentOverScrollAmount(true);
        float newTopAmount = currentTopAmount - deltaY;
        if (currentTopAmount > 0) {
            setOverScrollAmount(newTopAmount, true /* onTop */,
                    false /* animate */);
        }
        // Top overScroll might not grab all scrolling motion,
        // we have to scroll as well.
        if (ANCHOR_SCROLLING) {
            float scrollAmount = newTopAmount < 0 ? -newTopAmount : 0.0f;
            // TODO: once we're recycling this will need to check the adapter position of the child
            ExpandableView lastRow = getLastRowNotGone();
            if (lastRow != null && !lastRow.isInShelf()) {
                float distanceToMax = Math.max(0, getMaxPositiveScrollAmount());
                if (scrollAmount > distanceToMax) {
                    float currentBottomPixels = getCurrentOverScrolledPixels(false);
                    // We overScroll on the bottom
                    setOverScrolledPixels(currentBottomPixels + (scrollAmount - distanceToMax),
                            false /* onTop */,
                            false /* animate */);
                    mScrollAnchorViewY -= distanceToMax;
                    scrollAmount = 0f;
                }
            }
            return scrollAmount;
        } else {
            float scrollAmount = newTopAmount < 0 ? -newTopAmount : 0.0f;
            float newScrollY = mOwnScrollY + scrollAmount;
            if (newScrollY > range) {
                if (!mExpandedInThisMotion) {
                    float currentBottomPixels = getCurrentOverScrolledPixels(false);
                    // We overScroll on the bottom
                    setOverScrolledPixels(currentBottomPixels + newScrollY - range,
                            false /* onTop */,
                            false /* animate */);
                }
                setOwnScrollY(range);
                scrollAmount = 0.0f;
            }
            return scrollAmount;
        }
    }

    /**
     * Perform a scroll downward and adapt the overscroll amounts accordingly
     *
     * @param deltaY The amount to scroll downwards, has to be negative.
     * @return The amount of scrolling to be performed by the scroller,
     * not handled by the overScroll amount.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private float overScrollDown(int deltaY) {
        deltaY = Math.min(deltaY, 0);
        float currentBottomAmount = getCurrentOverScrollAmount(false);
        float newBottomAmount = currentBottomAmount + deltaY;
        if (currentBottomAmount > 0) {
            setOverScrollAmount(newBottomAmount, false /* onTop */,
                    false /* animate */);
        }
        // Bottom overScroll might not grab all scrolling motion,
        // we have to scroll as well.
        if (ANCHOR_SCROLLING) {
            float scrollAmount = newBottomAmount < 0 ? newBottomAmount : 0.0f;
            // TODO: once we're recycling this will need to check the adapter position of the child
            ExpandableView firstChild = getFirstChildNotGone();
            float top = firstChild.getTranslationY();
            float distanceToTop = mScrollAnchorView.getTranslationY() - top - mScrollAnchorViewY;
            if (distanceToTop < -scrollAmount) {
                float currentTopPixels = getCurrentOverScrolledPixels(true);
                // We overScroll on the top
                setOverScrolledPixels(currentTopPixels + (-scrollAmount - distanceToTop),
                        true /* onTop */,
                        false /* animate */);
                mScrollAnchorView = firstChild;
                mScrollAnchorViewY = 0;
                scrollAmount = 0f;
            }
            return scrollAmount;
        } else {
            float scrollAmount = newBottomAmount < 0 ? newBottomAmount : 0.0f;
            float newScrollY = mOwnScrollY + scrollAmount;
            if (newScrollY < 0) {
                float currentTopPixels = getCurrentOverScrolledPixels(true);
                // We overScroll on the top
                setOverScrolledPixels(currentTopPixels - newScrollY,
                        true /* onTop */,
                        false /* animate */);
                setOwnScrollY(0);
                scrollAmount = 0.0f;
            }
            return scrollAmount;
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void initVelocityTrackerIfNotExists() {
        if (mVelocityTracker == null) {
            mVelocityTracker = VelocityTracker.obtain();
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void recycleVelocityTracker() {
        if (mVelocityTracker != null) {
            mVelocityTracker.recycle();
            mVelocityTracker = null;
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void initOrResetVelocityTracker() {
        if (mVelocityTracker == null) {
            mVelocityTracker = VelocityTracker.obtain();
        } else {
            mVelocityTracker.clear();
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setFinishScrollingCallback(Runnable runnable) {
        mFinishScrollingCallback = runnable;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void animateScroll() {
        if (mScroller.computeScrollOffset()) {
            if (ANCHOR_SCROLLING) {
                int oldY = mLastScrollerY;
                int y = mScroller.getCurrY();
                int deltaY = y - oldY;
                if (deltaY != 0) {
                    int maxNegativeScrollAmount = getMaxNegativeScrollAmount();
                    int maxPositiveScrollAmount = getMaxPositiveScrollAmount();
                    if ((maxNegativeScrollAmount < 0 && deltaY < maxNegativeScrollAmount)
                            || (maxPositiveScrollAmount > 0 && deltaY > maxPositiveScrollAmount)) {
                        // This frame takes us into overscroll, so set the max overscroll based on
                        // the current velocity
                        setMaxOverScrollFromCurrentVelocity();
                    }
                    customOverScrollBy(deltaY, oldY, 0, (int) mMaxOverScroll);
                    mLastScrollerY = y;
                }
            } else {
                int oldY = mOwnScrollY;
                int y = mScroller.getCurrY();

                if (oldY != y) {
                    int range = getScrollRange();
                    if (y < 0 && oldY >= 0 || y > range && oldY <= range) {
                        // This frame takes us into overscroll, so set the max overscroll based on
                        // the current velocity
                        setMaxOverScrollFromCurrentVelocity();
                    }

                    if (mDontClampNextScroll) {
                        range = Math.max(range, oldY);
                    }
                    customOverScrollBy(y - oldY, oldY, range,
                            (int) (mMaxOverScroll));
                }
            }

            postOnAnimation(mReflingAndAnimateScroll);
        } else {
            mDontClampNextScroll = false;
            if (mFinishScrollingCallback != null) {
                mFinishScrollingCallback.run();
            }
        }
    }

    private void setMaxOverScrollFromCurrentVelocity() {
        float currVelocity = mScroller.getCurrVelocity();
        if (currVelocity >= mMinimumVelocity) {
            mMaxOverScroll = Math.abs(currVelocity) / 1000 * mOverflingDistance;
        }
    }

    /**
     * Scrolls by the given delta, overscrolling if needed.  If called during a fling and the delta
     * would cause us to exceed the provided maximum overscroll, springs back instead.
     *
     * This method performs the determination of whether we're exceeding the overscroll and clamps
     * the scroll amount if so.  The actual scrolling/overscrolling happens in
     * {@link #onCustomOverScrolled(int, boolean)} (absolute scrolling) or
     * {@link #onCustomOverScrolledBy(int, boolean)} (anchor scrolling).
     *
     * @param deltaY         The (signed) number of pixels to scroll.
     * @param scrollY        The current scroll position (absolute scrolling only).
     * @param scrollRangeY   The maximum allowable scroll position (absolute scrolling only).
     * @param maxOverScrollY The current (unsigned) limit on number of pixels to overscroll by.
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void customOverScrollBy(int deltaY, int scrollY, int scrollRangeY, int maxOverScrollY) {
        if (ANCHOR_SCROLLING) {
            boolean clampedY = false;
            if (deltaY < 0) {
                int maxScrollAmount = getMaxNegativeScrollAmount();
                if (maxScrollAmount > Integer.MIN_VALUE) {
                    maxScrollAmount -= maxOverScrollY;
                    if (deltaY < maxScrollAmount) {
                        deltaY = maxScrollAmount;
                        clampedY = true;
                    }
                }
            } else {
                int maxScrollAmount = getMaxPositiveScrollAmount();
                if (maxScrollAmount < Integer.MAX_VALUE) {
                    maxScrollAmount += maxOverScrollY;
                    if (deltaY > maxScrollAmount) {
                        deltaY = maxScrollAmount;
                        clampedY = true;
                    }
                }
            }
            onCustomOverScrolledBy(deltaY, clampedY);
        } else {
            int newScrollY = scrollY + deltaY;
            final int top = -maxOverScrollY;
            final int bottom = maxOverScrollY + scrollRangeY;

            boolean clampedY = false;
            if (newScrollY > bottom) {
                newScrollY = bottom;
                clampedY = true;
            } else if (newScrollY < top) {
                newScrollY = top;
                clampedY = true;
            }

            onCustomOverScrolled(newScrollY, clampedY);
        }
    }

    /**
     * Set the amount of overScrolled pixels which will force the view to apply a rubber-banded
     * overscroll effect based on numPixels. By default this will also cancel animations on the
     * same overScroll edge.
     *
     * @param numPixels The amount of pixels to overScroll by. These will be scaled according to
     *                  the rubber-banding logic.
     * @param onTop     Should the effect be applied on top of the scroller.
     * @param animate   Should an animation be performed.
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void setOverScrolledPixels(float numPixels, boolean onTop, boolean animate) {
        setOverScrollAmount(numPixels * getRubberBandFactor(onTop), onTop, animate, true);
    }

    /**
     * Set the effective overScroll amount which will be directly reflected in the layout.
     * By default this will also cancel animations on the same overScroll edge.
     *
     * @param amount  The amount to overScroll by.
     * @param onTop   Should the effect be applied on top of the scroller.
     * @param animate Should an animation be performed.
     */

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void setOverScrollAmount(float amount, boolean onTop, boolean animate) {
        setOverScrollAmount(amount, onTop, animate, true);
    }

    /**
     * Set the effective overScroll amount which will be directly reflected in the layout.
     *
     * @param amount          The amount to overScroll by.
     * @param onTop           Should the effect be applied on top of the scroller.
     * @param animate         Should an animation be performed.
     * @param cancelAnimators Should running animations be cancelled.
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void setOverScrollAmount(float amount, boolean onTop, boolean animate,
            boolean cancelAnimators) {
        setOverScrollAmount(amount, onTop, animate, cancelAnimators, isRubberbanded(onTop));
    }

    /**
     * Set the effective overScroll amount which will be directly reflected in the layout.
     *
     * @param amount          The amount to overScroll by.
     * @param onTop           Should the effect be applied on top of the scroller.
     * @param animate         Should an animation be performed.
     * @param cancelAnimators Should running animations be cancelled.
     * @param isRubberbanded  The value which will be passed to
     *                        {@link OnOverscrollTopChangedListener#onOverscrollTopChanged}
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void setOverScrollAmount(float amount, boolean onTop, boolean animate,
            boolean cancelAnimators, boolean isRubberbanded) {
        if (cancelAnimators) {
            mStateAnimator.cancelOverScrollAnimators(onTop);
        }
        setOverScrollAmountInternal(amount, onTop, animate, isRubberbanded);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void setOverScrollAmountInternal(float amount, boolean onTop, boolean animate,
            boolean isRubberbanded) {
        amount = Math.max(0, amount);
        if (animate) {
            mStateAnimator.animateOverScrollToAmount(amount, onTop, isRubberbanded);
        } else {
            setOverScrolledPixels(amount / getRubberBandFactor(onTop), onTop);
            mAmbientState.setOverScrollAmount(amount, onTop);
            if (onTop) {
                notifyOverscrollTopListener(amount, isRubberbanded);
            }
            requestChildrenUpdate();
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void notifyOverscrollTopListener(float amount, boolean isRubberbanded) {
        mExpandHelper.onlyObserveMovements(amount > 1.0f);
        if (mDontReportNextOverScroll) {
            mDontReportNextOverScroll = false;
            return;
        }
        if (mOverscrollTopChangedListener != null) {
            mOverscrollTopChangedListener.onOverscrollTopChanged(amount, isRubberbanded);
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public void setOverscrollTopChangedListener(
            OnOverscrollTopChangedListener overscrollTopChangedListener) {
        mOverscrollTopChangedListener = overscrollTopChangedListener;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public float getCurrentOverScrollAmount(boolean top) {
        return mAmbientState.getOverScrollAmount(top);
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public float getCurrentOverScrolledPixels(boolean top) {
        return top ? mOverScrolledTopPixels : mOverScrolledBottomPixels;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void setOverScrolledPixels(float amount, boolean onTop) {
        if (onTop) {
            mOverScrolledTopPixels = amount;
        } else {
            mOverScrolledBottomPixels = amount;
        }
    }

    /**
     * Scrolls by the given delta, overscrolling if needed.  If called during a fling and the delta
     * would cause us to exceed the provided maximum overscroll, springs back instead.
     *
     * @param deltaY   The (signed) number of pixels to scroll.
     * @param clampedY Whether this value was clamped by the calling method, meaning we've reached
     *                 the overscroll limit.
     */
    private void onCustomOverScrolledBy(int deltaY, boolean clampedY) {
        assert ANCHOR_SCROLLING;
        mScrollAnchorViewY -= deltaY;
        // Treat animating scrolls differently; see #computeScroll() for why.
        if (!mScroller.isFinished()) {
            if (clampedY) {
                springBack();
            } else {
                float overScrollTop = getCurrentOverScrollAmount(true /* top */);
                if (isScrolledToTop() && mScrollAnchorViewY > 0) {
                    notifyOverscrollTopListener(mScrollAnchorViewY,
                            isRubberbanded(true /* onTop */));
                } else {
                    notifyOverscrollTopListener(overScrollTop, isRubberbanded(true /* onTop */));
                }
            }
        }
        updateScrollAnchor();
        updateOnScrollChange();
    }

    /**
     * Scrolls to the given position, overscrolling if needed.  If called during a fling and the
     * position exceeds the provided maximum overscroll, springs back instead.
     *
     * @param scrollY The target scroll position.
     * @param clampedY Whether this value was clamped by the calling method, meaning we've reached
     *                 the overscroll limit.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void onCustomOverScrolled(int scrollY, boolean clampedY) {
        assert !ANCHOR_SCROLLING;
        // Treat animating scrolls differently; see #computeScroll() for why.
        if (!mScroller.isFinished()) {
            setOwnScrollY(scrollY);
            if (clampedY) {
                springBack();
            } else {
                float overScrollTop = getCurrentOverScrollAmount(true);
                if (mOwnScrollY < 0) {
                    notifyOverscrollTopListener(-mOwnScrollY, isRubberbanded(true));
                } else {
                    notifyOverscrollTopListener(overScrollTop, isRubberbanded(true));
                }
            }
        } else {
            setOwnScrollY(scrollY);
        }
    }

    /**
     * Springs back from an overscroll by stopping the {@link #mScroller} and animating the
     * overscroll amount back to zero.
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void springBack() {
        if (ANCHOR_SCROLLING) {
            boolean overScrolledTop = isScrolledToTop() && mScrollAnchorViewY > 0;
            int maxPositiveScrollAmount = getMaxPositiveScrollAmount();
            boolean overscrolledBottom = maxPositiveScrollAmount < 0;
            if (overScrolledTop || overscrolledBottom) {
                float newAmount;
                if (overScrolledTop) {
                    newAmount = mScrollAnchorViewY;
                    mScrollAnchorViewY = 0;
                    mDontReportNextOverScroll = true;
                } else {
                    newAmount = -maxPositiveScrollAmount;
                    mScrollAnchorViewY -= maxPositiveScrollAmount;
                }
                setOverScrollAmount(newAmount, overScrolledTop, false);
                setOverScrollAmount(0.0f, overScrolledTop, true);
                mScroller.forceFinished(true);
            }
        } else {
            int scrollRange = getScrollRange();
            boolean overScrolledTop = mOwnScrollY <= 0;
            boolean overScrolledBottom = mOwnScrollY >= scrollRange;
            if (overScrolledTop || overScrolledBottom) {
                boolean onTop;
                float newAmount;
                if (overScrolledTop) {
                    onTop = true;
                    newAmount = -mOwnScrollY;
                    setOwnScrollY(0);
                    mDontReportNextOverScroll = true;
                } else {
                    onTop = false;
                    newAmount = mOwnScrollY - scrollRange;
                    setOwnScrollY(scrollRange);
                }
                setOverScrollAmount(newAmount, onTop, false);
                setOverScrollAmount(0.0f, onTop, true);
                mScroller.forceFinished(true);
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private int getScrollRange() {
        // In current design, it only use the top HUN to treat all of HUNs
        // although there are more than one HUNs
        int contentHeight = mContentHeight;
        if (!isExpanded() && mHeadsUpManager.hasPinnedHeadsUp()) {
            contentHeight = mHeadsUpInset + getTopHeadsUpPinnedHeight();
        }
        int scrollRange = Math.max(0, contentHeight - mMaxLayoutHeight);
        int imeInset = getImeInset();
        scrollRange += Math.min(imeInset, Math.max(0, contentHeight - (getHeight() - imeInset)));
        return scrollRange;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private int getImeInset() {
        return Math.max(0, mBottomInset - (getRootView().getHeight() - getHeight()));
    }

    /**
     * @return the first child which has visibility unequal to GONE
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public ExpandableView getFirstChildNotGone() {
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != View.GONE && child != mShelf) {
                return (ExpandableView) child;
            }
        }
        return null;
    }

    /**
     * @return the child before the given view which has visibility unequal to GONE
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public ExpandableView getViewBeforeView(ExpandableView view) {
        ExpandableView previousView = null;
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            if (child == view) {
                return previousView;
            }
            if (child.getVisibility() != View.GONE) {
                previousView = (ExpandableView) child;
            }
        }
        return null;
    }

    /**
     * @return The first child which has visibility unequal to GONE which is currently below the
     * given translationY or equal to it.
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private View getFirstChildBelowTranlsationY(float translationY, boolean ignoreChildren) {
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() == View.GONE) {
                continue;
            }
            float rowTranslation = child.getTranslationY();
            if (rowTranslation >= translationY) {
                return child;
            } else if (!ignoreChildren && child instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) child;
                if (row.isSummaryWithChildren() && row.areChildrenExpanded()) {
                    List<ExpandableNotificationRow> notificationChildren =
                            row.getNotificationChildren();
                    for (int childIndex = 0; childIndex < notificationChildren.size();
                            childIndex++) {
                        ExpandableNotificationRow rowChild = notificationChildren.get(childIndex);
                        if (rowChild.getTranslationY() + rowTranslation >= translationY) {
                            return rowChild;
                        }
                    }
                }
            }
        }
        return null;
    }

    /**
     * @return the last child which has visibility unequal to GONE
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public ExpandableView getLastChildNotGone() {
        int childCount = getChildCount();
        for (int i = childCount - 1; i >= 0; i--) {
            View child = getChildAt(i);
            if (child.getVisibility() != View.GONE && child != mShelf) {
                return (ExpandableView) child;
            }
        }
        return null;
    }

    private ExpandableNotificationRow getLastRowNotGone() {
        int childCount = getChildCount();
        for (int i = childCount - 1; i >= 0; i--) {
            View child = getChildAt(i);
            if (child instanceof ExpandableNotificationRow && child.getVisibility() != View.GONE) {
                return (ExpandableNotificationRow) child;
            }
        }
        return null;
    }

    /**
     * @return the number of children which have visibility unequal to GONE
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public int getNotGoneChildCount() {
        int childCount = getChildCount();
        int count = 0;
        for (int i = 0; i < childCount; i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            if (child.getVisibility() != View.GONE && !child.willBeGone() && child != mShelf) {
                count++;
            }
        }
        return count;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateContentHeight() {
        int height = 0;
        float previousPaddingRequest = mPaddingBetweenElements;
        float previousPaddingAmount = 0.0f;
        int numShownItems = 0;
        boolean finish = false;
        int maxDisplayedNotifications = mMaxDisplayedNotifications;

        for (int i = 0; i < getChildCount(); i++) {
            ExpandableView expandableView = (ExpandableView) getChildAt(i);
            boolean footerViewOnLockScreen = expandableView == mFooterView && onKeyguard();
            if (expandableView.getVisibility() != View.GONE
                    && !expandableView.hasNoContentHeight() && !footerViewOnLockScreen) {
                boolean limitReached = maxDisplayedNotifications != -1
                        && numShownItems >= maxDisplayedNotifications;
                if (limitReached) {
                    expandableView = mShelf;
                    finish = true;
                }
                float increasedPaddingAmount = expandableView.getIncreasedPaddingAmount();
                float padding;
                if (increasedPaddingAmount >= 0.0f) {
                    padding = (int) NotificationUtils.interpolate(
                            previousPaddingRequest,
                            mIncreasedPaddingBetweenElements,
                            increasedPaddingAmount);
                    previousPaddingRequest = (int) NotificationUtils.interpolate(
                            mPaddingBetweenElements,
                            mIncreasedPaddingBetweenElements,
                            increasedPaddingAmount);
                } else {
                    int ownPadding = (int) NotificationUtils.interpolate(
                            0,
                            mPaddingBetweenElements,
                            1.0f + increasedPaddingAmount);
                    if (previousPaddingAmount > 0.0f) {
                        padding = (int) NotificationUtils.interpolate(
                                ownPadding,
                                mIncreasedPaddingBetweenElements,
                                previousPaddingAmount);
                    } else {
                        padding = ownPadding;
                    }
                    previousPaddingRequest = ownPadding;
                }
                if (height != 0) {
                    height += padding;
                }
                previousPaddingAmount = increasedPaddingAmount;
                height += expandableView.getIntrinsicHeight();
                numShownItems++;
                if (finish) {
                    break;
                }
            }
        }
        mIntrinsicContentHeight = height;

        // The topPadding can be bigger than the regular padding when qs is expanded, in that
        // state the maxPanelHeight and the contentHeight should be bigger
        mContentHeight = height + Math.max(mIntrinsicPadding, mTopPadding) + mBottomMargin;
        updateScrollability();
        clampScrollPosition();
        mAmbientState.setLayoutMaxHeight(mContentHeight);
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean hasPulsingNotifications() {
        return mPulsing;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void updateScrollability() {
        boolean scrollable = !mQsExpanded && getScrollRange() > 0;
        if (scrollable != mScrollable) {
            mScrollable = scrollable;
            setFocusable(scrollable);
            updateForwardAndBackwardScrollability();
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void updateForwardAndBackwardScrollability() {
        boolean forwardScrollable = mScrollable && !isScrolledToBottom();
        boolean backwardsScrollable = mScrollable && !isScrolledToTop();
        boolean changed = forwardScrollable != mForwardScrollable
                || backwardsScrollable != mBackwardScrollable;
        mForwardScrollable = forwardScrollable;
        mBackwardScrollable = backwardsScrollable;
        if (changed) {
            sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void updateBackground() {
        // No need to update the background color if it's not being drawn.
        if (!mShouldDrawNotificationBackground) {
            return;
        }

        updateBackgroundBounds();
        if (didSectionBoundsChange()) {
            boolean animate = mAnimateNextSectionBoundsChange || mAnimateNextBackgroundTop
                    || mAnimateNextBackgroundBottom || areSectionBoundsAnimating();
            if (!isExpanded()) {
                abortBackgroundAnimators();
                animate = false;
            }
            if (animate) {
                startBackgroundAnimation();
            } else {
                for (NotificationSection section : mSections) {
                    section.resetCurrentBounds();
                }
                invalidate();
            }
        } else {
            abortBackgroundAnimators();
        }
        mAnimateNextBackgroundTop = false;
        mAnimateNextBackgroundBottom = false;
        mAnimateNextSectionBoundsChange = false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void abortBackgroundAnimators() {
        for (NotificationSection section : mSections) {
            section.cancelAnimators();
        }
    }

    private boolean didSectionBoundsChange() {
        for (NotificationSection section : mSections) {
            if (section.didBoundsChange()) {
                return true;
            }
        }
        return false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private boolean areSectionBoundsAnimating() {
        for (NotificationSection section : mSections) {
            if (section.areBoundsAnimating()) {
                return true;
            }
        }
        return false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void startBackgroundAnimation() {
        // TODO(kprevas): do we still need separate fields for top/bottom?
        // or can each section manage its own animation state?
        NotificationSection firstVisibleSection = getFirstVisibleSection();
        NotificationSection lastVisibleSection = getLastVisibleSection();
        for (NotificationSection section : mSections) {
            section.startBackgroundAnimation(
                    section == firstVisibleSection
                            ? mAnimateNextBackgroundTop
                            : mAnimateNextSectionBoundsChange,
                    section == lastVisibleSection
                            ? mAnimateNextBackgroundBottom
                            : mAnimateNextSectionBoundsChange);
        }
    }

    /**
     * Update the background bounds to the new desired bounds
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void updateBackgroundBounds() {
        int left = mSidePaddings;
        int right = getWidth() - mSidePaddings;
        for (NotificationSection section : mSections) {
            section.getBounds().left = left;
            section.getBounds().right = right;
        }

        if (!mIsExpanded) {
            for (NotificationSection section : mSections) {
                section.getBounds().top = 0;
                section.getBounds().bottom = 0;
            }
            return;
        }
        int minTopPosition;
        NotificationSection lastSection = getLastVisibleSection();
        boolean onKeyguard = mStatusBarState == StatusBarState.KEYGUARD;
        if (!onKeyguard) {
            minTopPosition = (int) (mTopPadding + mStackTranslation);
        } else if (lastSection == null) {
            minTopPosition = mTopPadding;
        } else {
            // The first sections could be empty while there could still be elements in later
            // sections. The position of these first few sections is determined by the position of
            // the first visible section.
            NotificationSection firstVisibleSection = getFirstVisibleSection();
            firstVisibleSection.updateBounds(0 /* minTopPosition*/, 0 /* minBottomPosition */,
                    false /* shiftPulsingWithFirst */);
            minTopPosition = firstVisibleSection.getBounds().top;
        }
        boolean shiftPulsingWithFirst = mHeadsUpManager.getAllEntries().count() <= 1
                && (mAmbientState.isDozing()
                        || (mKeyguardBypassController.getBypassEnabled() && onKeyguard));
        for (NotificationSection section : mSections) {
            int minBottomPosition = minTopPosition;
            if (section == lastSection) {
                // We need to make sure the section goes all the way to the shelf
                minBottomPosition = (int) (ViewState.getFinalTranslationY(mShelf)
                        + mShelf.getIntrinsicHeight());
            }
            minTopPosition = section.updateBounds(minTopPosition, minBottomPosition,
                    shiftPulsingWithFirst);
            shiftPulsingWithFirst = false;
        }
    }

    private NotificationSection getFirstVisibleSection() {
        for (NotificationSection section : mSections) {
            if (section.getFirstVisibleChild() != null) {
                return section;
            }
        }
        return null;
    }

    private NotificationSection getLastVisibleSection() {
        for (int i = mSections.length - 1; i >= 0; i--) {
            NotificationSection section = mSections[i];
            if (section.getLastVisibleChild() != null) {
                return section;
            }
        }
        return null;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private ActivatableNotificationView getLastChildWithBackground() {
        int childCount = getChildCount();
        for (int i = childCount - 1; i >= 0; i--) {
            View child = getChildAt(i);
            if (child.getVisibility() != View.GONE && child instanceof ActivatableNotificationView
                    && child != mShelf) {
                return (ActivatableNotificationView) child;
            }
        }
        return null;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private ActivatableNotificationView getFirstChildWithBackground() {
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != View.GONE && child instanceof ActivatableNotificationView
                    && child != mShelf) {
                return (ActivatableNotificationView) child;
            }
        }
        return null;
    }

    //TODO: We shouldn't have to generate this list every time
    private List<ActivatableNotificationView> getChildrenWithBackground() {
        ArrayList<ActivatableNotificationView> children = new ArrayList<>();
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            if (child.getVisibility() != View.GONE && child instanceof ActivatableNotificationView
                    && child != mShelf) {
                children.add((ActivatableNotificationView) child);
            }
        }

        return children;
    }

    /**
     * Fling the scroll view
     *
     * @param velocityY The initial velocity in the Y direction. Positive
     *                  numbers mean that the finger/cursor is moving down the screen,
     *                  which means we want to scroll towards the top.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    protected void fling(int velocityY) {
        if (getChildCount() > 0) {
            float topAmount = getCurrentOverScrollAmount(true);
            float bottomAmount = getCurrentOverScrollAmount(false);
            if (velocityY < 0 && topAmount > 0) {
                if (ANCHOR_SCROLLING) {
                    mScrollAnchorViewY += topAmount;
                } else {
                    setOwnScrollY(mOwnScrollY - (int) topAmount);
                }
                mDontReportNextOverScroll = true;
                setOverScrollAmount(0, true, false);
                mMaxOverScroll = Math.abs(velocityY) / 1000f * getRubberBandFactor(true /* onTop */)
                        * mOverflingDistance + topAmount;
            } else if (velocityY > 0 && bottomAmount > 0) {
                if (ANCHOR_SCROLLING) {
                    mScrollAnchorViewY -= bottomAmount;
                } else {
                    setOwnScrollY((int) (mOwnScrollY + bottomAmount));
                }
                setOverScrollAmount(0, false, false);
                mMaxOverScroll = Math.abs(velocityY) / 1000f
                        * getRubberBandFactor(false /* onTop */) * mOverflingDistance
                        + bottomAmount;
            } else {
                // it will be set once we reach the boundary
                mMaxOverScroll = 0.0f;
            }
            if (ANCHOR_SCROLLING) {
                flingScroller(velocityY);
            } else {
                int scrollRange = getScrollRange();
                int minScrollY = Math.max(0, scrollRange);
                if (mExpandedInThisMotion) {
                    minScrollY = Math.min(minScrollY, mMaxScrollAfterExpand);
                }
                mScroller.fling(mScrollX, mOwnScrollY, 1, velocityY, 0, 0, 0, minScrollY, 0,
                        mExpandedInThisMotion && mOwnScrollY >= 0 ? 0 : Integer.MAX_VALUE / 2);
            }

            animateScroll();
        }
    }

    /**
     * Flings the overscroller with the given velocity (anchor-based scrolling).
     *
     * Because anchor-based scrolling can't track the current scroll position, the overscroller is
     * always started at startY = 0, and we interpret the positions it computes as relative to the
     * start of the scroll.
     */
    private void flingScroller(int velocityY) {
        assert ANCHOR_SCROLLING;
        mIsScrollerBoundSet = false;
        maybeFlingScroller(velocityY, true /* always fling */);
    }

    private void maybeFlingScroller(int velocityY, boolean alwaysFling) {
        assert ANCHOR_SCROLLING;
        // Attempt to determine the maximum amount to scroll before we reach the end.
        // If the first view is not materialized (for an upwards scroll) or the last view is either
        // not materialized or is pinned to the shade (for a downwards scroll), we don't know this
        // amount, so we do an unbounded fling and rely on {@link #maybeReflingScroller()} to update
        // the scroller once we approach the start/end of the list.
        int minY = Integer.MIN_VALUE;
        int maxY = Integer.MAX_VALUE;
        if (velocityY < 0) {
            minY = getMaxNegativeScrollAmount();
            if (minY > Integer.MIN_VALUE) {
                mIsScrollerBoundSet = true;
            }
        } else {
            maxY = getMaxPositiveScrollAmount();
            if (maxY < Integer.MAX_VALUE) {
                mIsScrollerBoundSet = true;
            }
        }
        if (mIsScrollerBoundSet || alwaysFling) {
            mLastScrollerY = 0;
            // x velocity is set to 1 to avoid overscroller bug
            mScroller.fling(0, 0, 1, velocityY, 0, 0, minY, maxY, 0,
                    mExpandedInThisMotion && !isScrolledToTop() ? 0 : Integer.MAX_VALUE / 2);
        }
    }

    /**
     * Returns the maximum number of pixels we can scroll in the positive direction (downwards)
     * before reaching the bottom of the list (discounting overscroll).
     *
     * If the return value is negative then we have overscrolled; this is a transient state which
     * should immediately be handled by adjusting the anchor position and adding the extra space to
     * the bottom overscroll amount.
     *
     * If we don't know how many pixels we have left to scroll (because the last row has not been
     * materialized, or it's in the shelf so it doesn't have its "natural" position), we return
     * {@link Integer#MAX_VALUE}.
     */
    private int getMaxPositiveScrollAmount() {
        assert ANCHOR_SCROLLING;
        // TODO: once we're recycling we need to check the adapter position of the last child.
        ExpandableNotificationRow lastRow = getLastRowNotGone();
        if (mScrollAnchorView != null && lastRow != null && !lastRow.isInShelf()) {
            // distance from bottom of last child to bottom of notifications area is:
            // distance from bottom of last child
            return (int) (lastRow.getTranslationY() + lastRow.getActualHeight()
                    // to top of anchor view
                    - mScrollAnchorView.getTranslationY()
                    // plus distance from anchor view to top of notifications area
                    + mScrollAnchorViewY
                    // minus height of notifications area.
                    - (mMaxLayoutHeight - getIntrinsicPadding() - mFooterView.getActualHeight()));
        } else {
            return Integer.MAX_VALUE;
        }
    }

    /**
     * Returns the maximum number of pixels (as a negative number) we can scroll in the negative
     * direction (upwards) before reaching the top of the list (discounting overscroll).
     *
     * If the return value is positive then we have overscrolled; this is a transient state which
     * should immediately be handled by adjusting the anchor position and adding the extra space to
     * the top overscroll amount.
     *
     * If we don't know how many pixels we have left to scroll (because the first row has not been
     * materialized), we return {@link Integer#MIN_VALUE}.
     */
    private int getMaxNegativeScrollAmount() {
        assert ANCHOR_SCROLLING;
        // TODO: once we're recycling we need to check the adapter position of the first child.
        ExpandableView firstChild = getFirstChildNotGone();
        if (mScrollAnchorView != null && firstChild != null) {
            // distance from top of first child to top of notifications area is:
            // distance from top of anchor view
            return (int) -(mScrollAnchorView.getTranslationY()
                    // to top of first child
                    - firstChild.getTranslationY()
                    // minus distance from top of anchor view to top of notifications area.
                    - mScrollAnchorViewY);
        } else {
            return Integer.MIN_VALUE;
        }
    }

    /**
     * During a fling, if we were unable to set the bounds of the fling due to the top/bottom view
     * not being materialized or being pinned to the shelf, we need to check on every frame if we're
     * able to set the bounds.  If we are, we fling the scroller again with the newly computed
     * bounds.
     */
    private void maybeReflingScroller() {
        if (!mIsScrollerBoundSet) {
            // Because mScroller is a flywheel scroller, we fling with the minimum possible
            // velocity to establish direction, so as not to perceptibly affect the velocity.
            maybeFlingScroller((int) Math.signum(mScroller.getCurrVelocity()),
                    false /* alwaysFling */);
        }
    }

    /**
     * @return Whether a fling performed on the top overscroll edge lead to the expanded
     * overScroll view (i.e QS).
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private boolean shouldOverScrollFling(int initialVelocity) {
        float topOverScroll = getCurrentOverScrollAmount(true);
        return mScrolledToTopOnFirstDown
                && !mExpandedInThisMotion
                && topOverScroll > mMinTopOverScrollToEscape
                && initialVelocity > 0;
    }

    /**
     * Updates the top padding of the notifications, taking {@link #getIntrinsicPadding()} into
     * account.
     *
     * @param qsHeight               the top padding imposed by the quick settings panel
     * @param animate                whether to animate the change
     */
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public void updateTopPadding(float qsHeight, boolean animate) {
        int topPadding = (int) qsHeight;
        int minStackHeight = getLayoutMinHeight();
        if (topPadding + minStackHeight > getHeight()) {
            mTopPaddingOverflow = topPadding + minStackHeight - getHeight();
        } else {
            mTopPaddingOverflow = 0;
        }
        setTopPadding(topPadding, animate && !mKeyguardBypassController.getBypassEnabled());
        setExpandedHeight(mExpandedHeight);
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public void setMaxTopPadding(int maxTopPadding) {
        mMaxTopPadding = maxTopPadding;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public int getLayoutMinHeight() {
        if (isHeadsUpTransition()) {
            return getTopHeadsUpPinnedHeight();
        }
        return mShelf.getVisibility() == GONE ? 0 : mShelf.getIntrinsicHeight();
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public float getTopPaddingOverflow() {
        return mTopPaddingOverflow;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public int getPeekHeight() {
        final ExpandableView firstChild = getFirstChildNotGone();
        final int firstChildMinHeight = firstChild != null ? firstChild.getCollapsedHeight()
                : mCollapsedSize;
        int shelfHeight = 0;
        if (getLastVisibleSection() != null && mShelf.getVisibility() != GONE) {
            shelfHeight = mShelf.getIntrinsicHeight();
        }
        return mIntrinsicPadding + firstChildMinHeight + shelfHeight;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private int clampPadding(int desiredPadding) {
        return Math.max(desiredPadding, mIntrinsicPadding);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private float getRubberBandFactor(boolean onTop) {
        if (!onTop) {
            return RUBBER_BAND_FACTOR_NORMAL;
        }
        if (mExpandedInThisMotion) {
            return RUBBER_BAND_FACTOR_AFTER_EXPAND;
        } else if (mIsExpansionChanging || mPanelTracking) {
            return RUBBER_BAND_FACTOR_ON_PANEL_EXPAND;
        } else if (mScrolledToTopOnFirstDown) {
            return 1.0f;
        }
        return RUBBER_BAND_FACTOR_NORMAL;
    }

    /**
     * Accompanying function for {@link #getRubberBandFactor}: Returns true if the overscroll is
     * rubberbanded, false if it is technically an overscroll but rather a motion to expand the
     * overscroll view (e.g. expand QS).
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private boolean isRubberbanded(boolean onTop) {
        return !onTop || mExpandedInThisMotion || mIsExpansionChanging || mPanelTracking
                || !mScrolledToTopOnFirstDown;
    }


    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setChildTransferInProgress(boolean childTransferInProgress) {
        Assert.isMainThread();
        mChildTransferInProgress = childTransferInProgress;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    @Override
    public void onViewRemoved(View child) {
        super.onViewRemoved(child);
        // we only call our internal methods if this is actually a removal and not just a
        // notification which becomes a child notification
        if (!mChildTransferInProgress) {
            onViewRemovedInternal((ExpandableView) child, this);
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    @Override
    public void cleanUpViewStateForEntry(NotificationEntry entry) {
        View child = entry.getRow();
        if (child == mSwipeHelper.getTranslatingParentView()) {
            mSwipeHelper.clearTranslatingParentView();
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void onViewRemovedInternal(ExpandableView child, ViewGroup container) {
        if (mChangePositionInProgress) {
            // This is only a position change, don't do anything special
            return;
        }
        child.setOnHeightChangedListener(null);
        updateScrollStateForRemovedChild(child);
        boolean animationGenerated = generateRemoveAnimation(child);
        if (animationGenerated) {
            if (!mSwipedOutViews.contains(child)
                    || Math.abs(child.getTranslation()) != child.getWidth()) {
                container.addTransientView(child, 0);
                child.setTransientContainer(container);
            }
        } else {
            mSwipedOutViews.remove(child);
        }
        updateAnimationState(false, child);

        focusNextViewIfFocused(child);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void focusNextViewIfFocused(View view) {
        if (view instanceof ExpandableNotificationRow) {
            ExpandableNotificationRow row = (ExpandableNotificationRow) view;
            if (row.shouldRefocusOnDismiss()) {
                View nextView = row.getChildAfterViewWhenDismissed();
                if (nextView == null) {
                    View groupParentWhenDismissed = row.getGroupParentWhenDismissed();
                    nextView = getFirstChildBelowTranlsationY(groupParentWhenDismissed != null
                            ? groupParentWhenDismissed.getTranslationY()
                            : view.getTranslationY(), true /* ignoreChildren */);
                }
                if (nextView != null) {
                    nextView.requestAccessibilityFocus();
                }
            }
        }

    }

    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    private boolean isChildInGroup(View child) {
        return child instanceof ExpandableNotificationRow
                && mGroupManager.isChildInGroupWithSummary(
                ((ExpandableNotificationRow) child).getEntry().getSbn());
    }

    /**
     * Generate a remove animation for a child view.
     *
     * @param child The view to generate the remove animation for.
     * @return Whether an animation was generated.
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private boolean generateRemoveAnimation(ExpandableView child) {
        if (removeRemovedChildFromHeadsUpChangeAnimations(child)) {
            mAddedHeadsUpChildren.remove(child);
            return false;
        }
        if (isClickedHeadsUp(child)) {
            // An animation is already running, add it transiently
            mClearTransientViewsWhenFinished.add(child);
            return true;
        }
        if (mIsExpanded && mAnimationsEnabled && !isChildInInvisibleGroup(child)) {
            if (!mChildrenToAddAnimated.contains(child)) {
                // Generate Animations
                mChildrenToRemoveAnimated.add(child);
                mNeedsAnimation = true;
                return true;
            } else {
                mChildrenToAddAnimated.remove(child);
                mFromMoreCardAdditions.remove(child);
                return false;
            }
        }
        return false;
    }

    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    private boolean isClickedHeadsUp(View child) {
        return HeadsUpUtil.isClickedHeadsUpNotification(child);
    }

    /**
     * Remove a removed child view from the heads up animations if it was just added there
     *
     * @return whether any child was removed from the list to animate
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private boolean removeRemovedChildFromHeadsUpChangeAnimations(View child) {
        boolean hasAddEvent = false;
        for (Pair<ExpandableNotificationRow, Boolean> eventPair : mHeadsUpChangeAnimations) {
            ExpandableNotificationRow row = eventPair.first;
            boolean isHeadsUp = eventPair.second;
            if (child == row) {
                mTmpList.add(eventPair);
                hasAddEvent |= isHeadsUp;
            }
        }
        if (hasAddEvent) {
            // This child was just added lets remove all events.
            mHeadsUpChangeAnimations.removeAll(mTmpList);
            ((ExpandableNotificationRow) child).setHeadsUpAnimatingAway(false);
        }
        mTmpList.clear();
        return hasAddEvent;
    }

    /**
     * @param child the child to query
     * @return whether a view is not a top level child but a child notification and that group is
     * not expanded
     */
    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    private boolean isChildInInvisibleGroup(View child) {
        if (child instanceof ExpandableNotificationRow) {
            ExpandableNotificationRow row = (ExpandableNotificationRow) child;
            NotificationEntry groupSummary =
                    mGroupManager.getGroupSummary(row.getEntry().getSbn());
            if (groupSummary != null && groupSummary.getRow() != row) {
                return row.getVisibility() == View.INVISIBLE;
            }
        }
        return false;
    }

    /**
     * Updates the scroll position when a child was removed
     *
     * @param removedChild the removed child
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateScrollStateForRemovedChild(ExpandableView removedChild) {
        if (ANCHOR_SCROLLING) {
            if (removedChild == mScrollAnchorView) {
                ExpandableView firstChild = getFirstChildNotGone();
                if (firstChild != null) {
                    mScrollAnchorView = firstChild;
                } else {
                    mScrollAnchorView = mShelf;
                }
                // Adjust anchor view Y by the distance between the old and new anchors
                // so that there's no visible change.
                mScrollAnchorViewY +=
                        mScrollAnchorView.getTranslationY() - removedChild.getTranslationY();
            }
            updateScrollAnchor();
            // TODO: once we're recycling this will need to check the adapter position of the child
            if (mScrollAnchorView == getFirstChildNotGone() && mScrollAnchorViewY > 0) {
                mScrollAnchorViewY = 0;
            }
            updateOnScrollChange();
        } else {
            int startingPosition = getPositionInLinearLayout(removedChild);
            float increasedPaddingAmount = removedChild.getIncreasedPaddingAmount();
            int padding;
            if (increasedPaddingAmount >= 0) {
                padding = (int) NotificationUtils.interpolate(
                        mPaddingBetweenElements,
                        mIncreasedPaddingBetweenElements,
                        increasedPaddingAmount);
            } else {
                padding = (int) NotificationUtils.interpolate(
                        0,
                        mPaddingBetweenElements,
                        1.0f + increasedPaddingAmount);
            }
            int childHeight = getIntrinsicHeight(removedChild) + padding;
            int endPosition = startingPosition + childHeight;
            if (endPosition <= mOwnScrollY) {
                // This child is fully scrolled of the top, so we have to deduct its height from the
                // scrollPosition
                setOwnScrollY(mOwnScrollY - childHeight);
            } else if (startingPosition < mOwnScrollY) {
                // This child is currently being scrolled into, set the scroll position to the
                // start of this child
                setOwnScrollY(startingPosition);
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private int getIntrinsicHeight(View view) {
        if (view instanceof ExpandableView) {
            ExpandableView expandableView = (ExpandableView) view;
            return expandableView.getIntrinsicHeight();
        }
        return view.getHeight();
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public int getPositionInLinearLayout(View requestedView) {
        ExpandableNotificationRow childInGroup = null;
        ExpandableNotificationRow requestedRow = null;
        if (isChildInGroup(requestedView)) {
            // We're asking for a child in a group. Calculate the position of the parent first,
            // then within the parent.
            childInGroup = (ExpandableNotificationRow) requestedView;
            requestedView = requestedRow = childInGroup.getNotificationParent();
        }
        int position = 0;
        float previousPaddingRequest = mPaddingBetweenElements;
        float previousPaddingAmount = 0.0f;
        for (int i = 0; i < getChildCount(); i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            boolean notGone = child.getVisibility() != View.GONE;
            if (notGone && !child.hasNoContentHeight()) {
                float increasedPaddingAmount = child.getIncreasedPaddingAmount();
                float padding;
                if (increasedPaddingAmount >= 0.0f) {
                    padding = (int) NotificationUtils.interpolate(
                            previousPaddingRequest,
                            mIncreasedPaddingBetweenElements,
                            increasedPaddingAmount);
                    previousPaddingRequest = (int) NotificationUtils.interpolate(
                            mPaddingBetweenElements,
                            mIncreasedPaddingBetweenElements,
                            increasedPaddingAmount);
                } else {
                    int ownPadding = (int) NotificationUtils.interpolate(
                            0,
                            mPaddingBetweenElements,
                            1.0f + increasedPaddingAmount);
                    if (previousPaddingAmount > 0.0f) {
                        padding = (int) NotificationUtils.interpolate(
                                ownPadding,
                                mIncreasedPaddingBetweenElements,
                                previousPaddingAmount);
                    } else {
                        padding = ownPadding;
                    }
                    previousPaddingRequest = ownPadding;
                }
                if (position != 0) {
                    position += padding;
                }
                previousPaddingAmount = increasedPaddingAmount;
            }
            if (child == requestedView) {
                if (requestedRow != null) {
                    position += requestedRow.getPositionOfChild(childInGroup);
                }
                return position;
            }
            if (notGone) {
                position += getIntrinsicHeight(child);
            }
        }
        return 0;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void onViewAdded(View child) {
        super.onViewAdded(child);
        onViewAddedInternal((ExpandableView) child);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateFirstAndLastBackgroundViews() {
        NotificationSection firstSection = getFirstVisibleSection();
        NotificationSection lastSection = getLastVisibleSection();
        ActivatableNotificationView previousFirstChild =
                firstSection == null ? null : firstSection.getFirstVisibleChild();
        ActivatableNotificationView previousLastChild =
                lastSection == null ? null : lastSection.getLastVisibleChild();

        ActivatableNotificationView firstChild = getFirstChildWithBackground();
        ActivatableNotificationView lastChild = getLastChildWithBackground();
        boolean sectionViewsChanged = mSectionsManager.updateFirstAndLastViewsForAllSections(
                mSections, getChildrenWithBackground());

        if (mAnimationsEnabled && mIsExpanded) {
            mAnimateNextBackgroundTop = firstChild != previousFirstChild;
            mAnimateNextBackgroundBottom = lastChild != previousLastChild || mAnimateBottomOnLayout;
            mAnimateNextSectionBoundsChange = sectionViewsChanged;
        } else {
            mAnimateNextBackgroundTop = false;
            mAnimateNextBackgroundBottom = false;
            mAnimateNextSectionBoundsChange = false;
        }
        mAmbientState.setLastVisibleBackgroundChild(lastChild);
        mRoundnessManager.updateRoundedChildren(mSections);
        mAnimateBottomOnLayout = false;
        invalidate();
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void onViewAddedInternal(ExpandableView child) {
        updateHideSensitiveForChild(child);
        child.setOnHeightChangedListener(this);
        generateAddAnimation(child, false /* fromMoreCard */);
        updateAnimationState(child);
        updateChronometerForChild(child);
        if (child instanceof ExpandableNotificationRow) {
            ((ExpandableNotificationRow) child).setDismissRtl(mDismissRtl);
        }
        if (ANCHOR_SCROLLING) {
            // TODO: once we're recycling this will need to check the adapter position of the child
            if (child == getFirstChildNotGone() && (isScrolledToTop() || !mIsExpanded)) {
                // New child was added at the top while we're scrolled to the top;
                // make it the new anchor view so that we stay at the top.
                mScrollAnchorView = child;
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void updateHideSensitiveForChild(ExpandableView child) {
        child.setHideSensitiveForIntrinsicHeight(mAmbientState.isHideSensitive());
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void notifyGroupChildRemoved(ExpandableView row, ViewGroup childrenContainer) {
        onViewRemovedInternal(row, childrenContainer);
    }

    @Override
    public void notifyGroupChildRemoved(View child, ViewGroup parent) {
        notifyGroupChildRemoved((ExpandableView) child, parent);
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void notifyGroupChildAdded(ExpandableView row) {
        onViewAddedInternal(row);
    }

    @Override
    public void notifyGroupChildAdded(View view) {
        notifyGroupChildAdded((ExpandableView) view);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void setAnimationsEnabled(boolean animationsEnabled) {
        mAnimationsEnabled = animationsEnabled;
        updateNotificationAnimationStates();
        if (!animationsEnabled) {
            mSwipedOutViews.clear();
            mChildrenToRemoveAnimated.clear();
            clearTemporaryViewsInGroup(this);
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateNotificationAnimationStates() {
        boolean running = mAnimationsEnabled || hasPulsingNotifications();
        mShelf.setAnimationsEnabled(running);
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = getChildAt(i);
            running &= mIsExpanded || isPinnedHeadsUp(child);
            updateAnimationState(running, child);
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateAnimationState(View child) {
        updateAnimationState((mAnimationsEnabled || hasPulsingNotifications())
                && (mIsExpanded || isPinnedHeadsUp(child)), child);
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setExpandingNotification(ExpandableNotificationRow row) {
        mAmbientState.setExpandingNotification(row);
        requestChildrenUpdate();
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    public void bindRow(ExpandableNotificationRow row) {
        row.setHeadsUpAnimatingAwayListener(animatingAway -> {
            mRoundnessManager.onHeadsupAnimatingAwayChanged(row, animatingAway);
            mHeadsUpAppearanceController.updateHeader(row.getEntry());
        });
    }

    @Override
    public boolean containsView(View v) {
        return v.getParent() == this;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void applyExpandAnimationParams(ExpandAnimationParameters params) {
        mAmbientState.setExpandAnimationTopChange(params == null ? 0 : params.getTopChange());
        requestChildrenUpdate();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateAnimationState(boolean running, View child) {
        if (child instanceof ExpandableNotificationRow) {
            ExpandableNotificationRow row = (ExpandableNotificationRow) child;
            row.setIconAnimationRunning(running);
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public boolean isAddOrRemoveAnimationPending() {
        return mNeedsAnimation
                && (!mChildrenToAddAnimated.isEmpty() || !mChildrenToRemoveAnimated.isEmpty());
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void generateAddAnimation(ExpandableView child, boolean fromMoreCard) {
        if (mIsExpanded && mAnimationsEnabled && !mChangePositionInProgress && !isFullyHidden()) {
            // Generate Animations
            mChildrenToAddAnimated.add(child);
            if (fromMoreCard) {
                mFromMoreCardAdditions.add(child);
            }
            mNeedsAnimation = true;
        }
        if (isHeadsUp(child) && mAnimationsEnabled && !mChangePositionInProgress
                && !isFullyHidden()) {
            mAddedHeadsUpChildren.add(child);
            mChildrenToAddAnimated.remove(child);
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void changeViewPosition(ExpandableView child, int newIndex) {
        Assert.isMainThread();
        if (mChangePositionInProgress) {
            throw new IllegalStateException("Reentrant call to changeViewPosition");
        }

        int currentIndex = indexOfChild(child);

        if (currentIndex == -1) {
            boolean isTransient = false;
            if (child instanceof ExpandableNotificationRow
                    && child.getTransientContainer() != null) {
                isTransient = true;
            }
            Log.e(TAG, "Attempting to re-position "
                    + (isTransient ? "transient" : "")
                    + " view {"
                    + child
                    + "}");
            return;
        }

        if (child != null && child.getParent() == this && currentIndex != newIndex) {
            mChangePositionInProgress = true;
            child.setChangingPosition(true);
            removeView(child);
            addView(child, newIndex);
            child.setChangingPosition(false);
            mChangePositionInProgress = false;
            if (mIsExpanded && mAnimationsEnabled && child.getVisibility() != View.GONE) {
                mChildrenChangingPositions.add(child);
                mNeedsAnimation = true;
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void startAnimationToState() {
        if (mNeedsAnimation) {
            generateAllAnimationEvents();
            mNeedsAnimation = false;
        }
        if (!mAnimationEvents.isEmpty() || isCurrentlyAnimating()) {
            setAnimationRunning(true);
            mStateAnimator.startAnimationForEvents(mAnimationEvents, mGoToFullShadeDelay);
            mAnimationEvents.clear();
            updateBackground();
            updateViewShadows();
            updateClippingToTopRoundedCorner();
        } else {
            applyCurrentState();
        }
        mGoToFullShadeDelay = 0;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateAllAnimationEvents() {
        generateHeadsUpAnimationEvents();
        generateChildRemovalEvents();
        generateChildAdditionEvents();
        generatePositionChangeEvents();
        generateTopPaddingEvent();
        generateActivateEvent();
        generateDimmedEvent();
        generateHideSensitiveEvent();
        generateGoToFullShadeEvent();
        generateViewResizeEvent();
        generateGroupExpansionEvent();
        generateAnimateEverythingEvent();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateHeadsUpAnimationEvents() {
        for (Pair<ExpandableNotificationRow, Boolean> eventPair : mHeadsUpChangeAnimations) {
            ExpandableNotificationRow row = eventPair.first;
            boolean isHeadsUp = eventPair.second;
            if (isHeadsUp != row.isHeadsUp()) {
                // For cases where we have a heads up showing and appearing again we shouldn't
                // do the animations at all.
                continue;
            }
            int type = AnimationEvent.ANIMATION_TYPE_HEADS_UP_OTHER;
            boolean onBottom = false;
            boolean pinnedAndClosed = row.isPinned() && !mIsExpanded;
            boolean performDisappearAnimation = !mIsExpanded
                    // Only animate if we still have pinned heads up, otherwise we just have the
                    // regular collapse animation of the lock screen
                    || (mKeyguardBypassController.getBypassEnabled() && onKeyguard()
                            && mHeadsUpManager.hasPinnedHeadsUp());
            if (performDisappearAnimation && !isHeadsUp) {
                type = row.wasJustClicked()
                        ? AnimationEvent.ANIMATION_TYPE_HEADS_UP_DISAPPEAR_CLICK
                        : AnimationEvent.ANIMATION_TYPE_HEADS_UP_DISAPPEAR;
                if (row.isChildInGroup()) {
                    // We can otherwise get stuck in there if it was just isolated
                    row.setHeadsUpAnimatingAway(false);
                    continue;
                }
            } else {
                ExpandableViewState viewState = row.getViewState();
                if (viewState == null) {
                    // A view state was never generated for this view, so we don't need to animate
                    // this. This may happen with notification children.
                    continue;
                }
                if (isHeadsUp && (mAddedHeadsUpChildren.contains(row) || pinnedAndClosed)) {
                    if (pinnedAndClosed || shouldHunAppearFromBottom(viewState)) {
                        // Our custom add animation
                        type = AnimationEvent.ANIMATION_TYPE_HEADS_UP_APPEAR;
                    } else {
                        // Normal add animation
                        type = AnimationEvent.ANIMATION_TYPE_ADD;
                    }
                    onBottom = !pinnedAndClosed;
                }
            }
            AnimationEvent event = new AnimationEvent(row, type);
            event.headsUpFromBottom = onBottom;
            mAnimationEvents.add(event);
        }
        mHeadsUpChangeAnimations.clear();
        mAddedHeadsUpChildren.clear();
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private boolean shouldHunAppearFromBottom(ExpandableViewState viewState) {
        if (viewState.yTranslation + viewState.height < mAmbientState.getMaxHeadsUpTranslation()) {
            return false;
        }
        return true;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateGroupExpansionEvent() {
        // Generate a group expansion/collapsing event if there is such a group at all
        if (mExpandedGroupView != null) {
            mAnimationEvents.add(new AnimationEvent(mExpandedGroupView,
                    AnimationEvent.ANIMATION_TYPE_GROUP_EXPANSION_CHANGED));
            mExpandedGroupView = null;
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateViewResizeEvent() {
        if (mNeedViewResizeAnimation) {
            boolean hasDisappearAnimation = false;
            for (AnimationEvent animationEvent : mAnimationEvents) {
                final int type = animationEvent.animationType;
                if (type == AnimationEvent.ANIMATION_TYPE_HEADS_UP_DISAPPEAR_CLICK
                        || type == AnimationEvent.ANIMATION_TYPE_HEADS_UP_DISAPPEAR) {
                    hasDisappearAnimation = true;
                    break;
                }
            }

            if (!hasDisappearAnimation) {
                mAnimationEvents.add(
                        new AnimationEvent(null, AnimationEvent.ANIMATION_TYPE_VIEW_RESIZE));
            }
        }
        mNeedViewResizeAnimation = false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateChildRemovalEvents() {
        for (ExpandableView child : mChildrenToRemoveAnimated) {
            boolean childWasSwipedOut = mSwipedOutViews.contains(child);

            // we need to know the view after this one
            float removedTranslation = child.getTranslationY();
            boolean ignoreChildren = true;
            if (child instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) child;
                if (row.isRemoved() && row.wasChildInGroupWhenRemoved()) {
                    removedTranslation = row.getTranslationWhenRemoved();
                    ignoreChildren = false;
                }
                childWasSwipedOut |= Math.abs(row.getTranslation()) == row.getWidth();
            }
            if (!childWasSwipedOut) {
                Rect clipBounds = child.getClipBounds();
                childWasSwipedOut = clipBounds != null && clipBounds.height() == 0;

                if (childWasSwipedOut && child instanceof ExpandableView) {
                    // Clean up any potential transient views if the child has already been swiped
                    // out, as we won't be animating it further (due to its height already being
                    // clipped to 0.
                    ViewGroup transientContainer = ((ExpandableView) child).getTransientContainer();
                    if (transientContainer != null) {
                        transientContainer.removeTransientView(child);
                    }
                }
            }
            int animationType = childWasSwipedOut
                    ? AnimationEvent.ANIMATION_TYPE_REMOVE_SWIPED_OUT
                    : AnimationEvent.ANIMATION_TYPE_REMOVE;
            AnimationEvent event = new AnimationEvent(child, animationType);
            event.viewAfterChangingView = getFirstChildBelowTranlsationY(removedTranslation,
                    ignoreChildren);
            mAnimationEvents.add(event);
            mSwipedOutViews.remove(child);
        }
        mChildrenToRemoveAnimated.clear();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generatePositionChangeEvents() {
        for (ExpandableView child : mChildrenChangingPositions) {
            mAnimationEvents.add(new AnimationEvent(child,
                    AnimationEvent.ANIMATION_TYPE_CHANGE_POSITION));
        }
        mChildrenChangingPositions.clear();
        if (mGenerateChildOrderChangedEvent) {
            mAnimationEvents.add(new AnimationEvent(null,
                    AnimationEvent.ANIMATION_TYPE_CHANGE_POSITION));
            mGenerateChildOrderChangedEvent = false;
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateChildAdditionEvents() {
        for (ExpandableView child : mChildrenToAddAnimated) {
            if (mFromMoreCardAdditions.contains(child)) {
                mAnimationEvents.add(new AnimationEvent(child,
                        AnimationEvent.ANIMATION_TYPE_ADD,
                        StackStateAnimator.ANIMATION_DURATION_STANDARD));
            } else {
                mAnimationEvents.add(new AnimationEvent(child,
                        AnimationEvent.ANIMATION_TYPE_ADD));
            }
        }
        mChildrenToAddAnimated.clear();
        mFromMoreCardAdditions.clear();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateTopPaddingEvent() {
        if (mTopPaddingNeedsAnimation) {
            AnimationEvent event;
            if (mAmbientState.isDozing()) {
                event = new AnimationEvent(null /* view */,
                        AnimationEvent.ANIMATION_TYPE_TOP_PADDING_CHANGED,
                        KeyguardSliceView.DEFAULT_ANIM_DURATION);
            } else {
                event = new AnimationEvent(null /* view */,
                        AnimationEvent.ANIMATION_TYPE_TOP_PADDING_CHANGED);
            }
            mAnimationEvents.add(event);
        }
        mTopPaddingNeedsAnimation = false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateActivateEvent() {
        if (mActivateNeedsAnimation) {
            mAnimationEvents.add(
                    new AnimationEvent(null, AnimationEvent.ANIMATION_TYPE_ACTIVATED_CHILD));
        }
        mActivateNeedsAnimation = false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateAnimateEverythingEvent() {
        if (mEverythingNeedsAnimation) {
            mAnimationEvents.add(
                    new AnimationEvent(null, AnimationEvent.ANIMATION_TYPE_EVERYTHING));
        }
        mEverythingNeedsAnimation = false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateDimmedEvent() {
        if (mDimmedNeedsAnimation) {
            mAnimationEvents.add(
                    new AnimationEvent(null, AnimationEvent.ANIMATION_TYPE_DIMMED));
        }
        mDimmedNeedsAnimation = false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateHideSensitiveEvent() {
        if (mHideSensitiveNeedsAnimation) {
            mAnimationEvents.add(
                    new AnimationEvent(null, AnimationEvent.ANIMATION_TYPE_HIDE_SENSITIVE));
        }
        mHideSensitiveNeedsAnimation = false;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void generateGoToFullShadeEvent() {
        if (mGoToFullShadeNeedsAnimation) {
            mAnimationEvents.add(
                    new AnimationEvent(null, AnimationEvent.ANIMATION_TYPE_GO_TO_FULL_SHADE));
        }
        mGoToFullShadeNeedsAnimation = false;
    }

    @ShadeViewRefactor(RefactorComponent.LAYOUT_ALGORITHM)
    protected StackScrollAlgorithm createStackScrollAlgorithm(Context context) {
        return new StackScrollAlgorithm(context, this);
    }

    /**
     * @return Whether a y coordinate is inside the content.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean isInContentBounds(float y) {
        return y < getHeight() - getEmptyBottomMargin();
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    public void setLongPressListener(ExpandableNotificationRow.LongPressListener listener) {
        mLongPressListener = listener;
    }

    private float getTouchSlop(MotionEvent event) {
        // Adjust the touch slop if another gesture may be being performed.
        return event.getClassification() == MotionEvent.CLASSIFICATION_AMBIGUOUS_GESTURE
                ? mTouchSlop * mSlopMultiplier
                : mTouchSlop;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.INPUT)
    public boolean onTouchEvent(MotionEvent ev) {
        NotificationGuts guts = mNotificationGutsManager.getExposedGuts();
        boolean isCancelOrUp = ev.getActionMasked() == MotionEvent.ACTION_CANCEL
                || ev.getActionMasked() == MotionEvent.ACTION_UP;
        handleEmptySpaceClick(ev);
        boolean expandWantsIt = false;
        boolean swipingInProgress = mSwipingInProgress;
        if (mIsExpanded && !swipingInProgress && !mOnlyScrollingInThisMotion && guts == null) {
            if (isCancelOrUp) {
                mExpandHelper.onlyObserveMovements(false);
            }
            boolean wasExpandingBefore = mExpandingNotification;
            expandWantsIt = mExpandHelper.onTouchEvent(ev);
            if (mExpandedInThisMotion && !mExpandingNotification && wasExpandingBefore
                    && !mDisallowScrollingInThisMotion) {
                dispatchDownEventToScroller(ev);
            }
        }
        boolean scrollerWantsIt = false;
        if (mIsExpanded && !swipingInProgress && !mExpandingNotification
                && !mDisallowScrollingInThisMotion) {
            scrollerWantsIt = onScrollTouch(ev);
        }
        boolean horizontalSwipeWantsIt = false;
        if (!mIsBeingDragged
                && !mExpandingNotification
                && !mExpandedInThisMotion
                && !mOnlyScrollingInThisMotion
                && !mDisallowDismissInThisMotion) {
            horizontalSwipeWantsIt = mSwipeHelper.onTouchEvent(ev);
        }

        // Check if we need to clear any snooze leavebehinds
        if (guts != null && !NotificationSwipeHelper.isTouchInView(ev, guts)
                && guts.getGutsContent() instanceof NotificationSnooze) {
            NotificationSnooze ns = (NotificationSnooze) guts.getGutsContent();
            if ((ns.isExpanded() && isCancelOrUp)
                    || (!horizontalSwipeWantsIt && scrollerWantsIt)) {
                // If the leavebehind is expanded we clear it on the next up event, otherwise we
                // clear it on the next non-horizontal swipe or expand event.
                checkSnoozeLeavebehind();
            }
        }
        if (ev.getActionMasked() == MotionEvent.ACTION_UP) {
            mCheckForLeavebehind = true;
        }
        return horizontalSwipeWantsIt || scrollerWantsIt || expandWantsIt || super.onTouchEvent(ev);
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private void dispatchDownEventToScroller(MotionEvent ev) {
        MotionEvent downEvent = MotionEvent.obtain(ev);
        downEvent.setAction(MotionEvent.ACTION_DOWN);
        onScrollTouch(downEvent);
        downEvent.recycle();
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.INPUT)
    public boolean onGenericMotionEvent(MotionEvent event) {
        if (!isScrollingEnabled() || !mIsExpanded || mSwipingInProgress || mExpandingNotification
                || mDisallowScrollingInThisMotion) {
            return false;
        }
        if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_SCROLL: {
                    if (!mIsBeingDragged) {
                        final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL);
                        if (vscroll != 0) {
                            final int delta = (int) (vscroll * getVerticalScrollFactor());
                            if (ANCHOR_SCROLLING) {
                                mScrollAnchorViewY -= delta;
                                updateScrollAnchor();
                                clampScrollPosition();
                                updateOnScrollChange();
                            } else {
                                final int range = getScrollRange();
                                int oldScrollY = mOwnScrollY;
                                int newScrollY = oldScrollY - delta;
                                if (newScrollY < 0) {
                                    newScrollY = 0;
                                } else if (newScrollY > range) {
                                    newScrollY = range;
                                }
                                if (newScrollY != oldScrollY) {
                                    setOwnScrollY(newScrollY);
                                    return true;
                                }
                            }
                        }
                    }
                }
            }
        }
        return super.onGenericMotionEvent(event);
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private boolean onScrollTouch(MotionEvent ev) {
        if (!isScrollingEnabled()) {
            return false;
        }
        if (isInsideQsContainer(ev) && !mIsBeingDragged) {
            return false;
        }
        mForcedScroll = null;
        initVelocityTrackerIfNotExists();
        mVelocityTracker.addMovement(ev);

        final int action = ev.getAction();

        switch (action & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN: {
                if (getChildCount() == 0 || !isInContentBounds(ev)) {
                    return false;
                }
                boolean isBeingDragged = !mScroller.isFinished();
                setIsBeingDragged(isBeingDragged);
                /*
                 * If being flinged and user touches, stop the fling. isFinished
                 * will be false if being flinged.
                 */
                if (!mScroller.isFinished()) {
                    mScroller.forceFinished(true);
                }

                // Remember where the motion event started
                mLastMotionY = (int) ev.getY();
                mDownX = (int) ev.getX();
                mActivePointerId = ev.getPointerId(0);
                break;
            }
            case MotionEvent.ACTION_MOVE:
                final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
                if (activePointerIndex == -1) {
                    Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent");
                    break;
                }

                final int y = (int) ev.getY(activePointerIndex);
                final int x = (int) ev.getX(activePointerIndex);
                int deltaY = mLastMotionY - y;
                final int xDiff = Math.abs(x - mDownX);
                final int yDiff = Math.abs(deltaY);
                final float touchSlop = getTouchSlop(ev);
                if (!mIsBeingDragged && yDiff > touchSlop && yDiff > xDiff) {
                    setIsBeingDragged(true);
                    if (deltaY > 0) {
                        deltaY -= touchSlop;
                    } else {
                        deltaY += touchSlop;
                    }
                }
                if (mIsBeingDragged) {
                    // Scroll to follow the motion event
                    mLastMotionY = y;
                    float scrollAmount;
                    int range;
                    if (ANCHOR_SCROLLING) {
                        range = 0;  // unused in the methods it's being passed to
                    } else {
                        range = getScrollRange();
                        if (mExpandedInThisMotion) {
                            range = Math.min(range, mMaxScrollAfterExpand);
                        }
                    }
                    if (deltaY < 0) {
                        scrollAmount = overScrollDown(deltaY);
                    } else {
                        scrollAmount = overScrollUp(deltaY, range);
                    }

                    // Calling customOverScrollBy will call onCustomOverScrolled, which
                    // sets the scrolling if applicable.
                    if (scrollAmount != 0.0f) {
                        // The scrolling motion could not be compensated with the
                        // existing overScroll, we have to scroll the view
                        customOverScrollBy((int) scrollAmount, mOwnScrollY,
                                range, getHeight() / 2);
                        // If we're scrolling, leavebehinds should be dismissed
                        checkSnoozeLeavebehind();
                    }
                }
                break;
            case MotionEvent.ACTION_UP:
                if (mIsBeingDragged) {
                    final VelocityTracker velocityTracker = mVelocityTracker;
                    velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
                    int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId);

                    if (shouldOverScrollFling(initialVelocity)) {
                        onOverScrollFling(true, initialVelocity);
                    } else {
                        if (getChildCount() > 0) {
                            if ((Math.abs(initialVelocity) > mMinimumVelocity)) {
                                float currentOverScrollTop = getCurrentOverScrollAmount(true);
                                if (currentOverScrollTop == 0.0f || initialVelocity > 0) {
                                    fling(-initialVelocity);
                                } else {
                                    onOverScrollFling(false, initialVelocity);
                                }
                            } else {
                                if (ANCHOR_SCROLLING) {
                                    // TODO
                                } else {
                                    if (mScroller.springBack(mScrollX, mOwnScrollY, 0, 0, 0,
                                            getScrollRange())) {
                                        animateScroll();
                                    }
                                }
                            }
                        }
                    }
                    mActivePointerId = INVALID_POINTER;
                    endDrag();
                }

                break;
            case MotionEvent.ACTION_CANCEL:
                if (mIsBeingDragged && getChildCount() > 0) {
                    if (ANCHOR_SCROLLING) {
                        // TODO
                    } else {
                        if (mScroller.springBack(mScrollX, mOwnScrollY, 0, 0, 0,
                                getScrollRange())) {
                            animateScroll();
                        }
                    }
                    mActivePointerId = INVALID_POINTER;
                    endDrag();
                }
                break;
            case MotionEvent.ACTION_POINTER_DOWN: {
                final int index = ev.getActionIndex();
                mLastMotionY = (int) ev.getY(index);
                mDownX = (int) ev.getX(index);
                mActivePointerId = ev.getPointerId(index);
                break;
            }
            case MotionEvent.ACTION_POINTER_UP:
                onSecondaryPointerUp(ev);
                mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId));
                mDownX = (int) ev.getX(ev.findPointerIndex(mActivePointerId));
                break;
        }
        return true;
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    protected boolean isInsideQsContainer(MotionEvent ev) {
        return ev.getY() < mQsContainer.getBottom();
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private void onOverScrollFling(boolean open, int initialVelocity) {
        if (mOverscrollTopChangedListener != null) {
            mOverscrollTopChangedListener.flingTopOverscroll(initialVelocity, open);
        }
        mDontReportNextOverScroll = true;
        setOverScrollAmount(0.0f, true, false);
    }


    @ShadeViewRefactor(RefactorComponent.INPUT)
    private void onSecondaryPointerUp(MotionEvent ev) {
        final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >>
                MotionEvent.ACTION_POINTER_INDEX_SHIFT;
        final int pointerId = ev.getPointerId(pointerIndex);
        if (pointerId == mActivePointerId) {
            // This was our active pointer going up. Choose a new
            // active pointer and adjust accordingly.
            // TODO: Make this decision more intelligent.
            final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
            mLastMotionY = (int) ev.getY(newPointerIndex);
            mActivePointerId = ev.getPointerId(newPointerIndex);
            if (mVelocityTracker != null) {
                mVelocityTracker.clear();
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private void endDrag() {
        setIsBeingDragged(false);

        recycleVelocityTracker();

        if (getCurrentOverScrollAmount(true /* onTop */) > 0) {
            setOverScrollAmount(0, true /* onTop */, true /* animate */);
        }
        if (getCurrentOverScrollAmount(false /* onTop */) > 0) {
            setOverScrollAmount(0, false /* onTop */, true /* animate */);
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.INPUT)
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        initDownStates(ev);
        handleEmptySpaceClick(ev);

        NotificationGuts guts = mNotificationGutsManager.getExposedGuts();
        boolean expandWantsIt = false;
        boolean swipingInProgress = mSwipingInProgress;
        if (!swipingInProgress && !mOnlyScrollingInThisMotion && guts == null) {
            expandWantsIt = mExpandHelper.onInterceptTouchEvent(ev);
        }
        boolean scrollWantsIt = false;
        if (!swipingInProgress && !mExpandingNotification) {
            scrollWantsIt = onInterceptTouchEventScroll(ev);
        }
        boolean swipeWantsIt = false;
        if (!mIsBeingDragged
                && !mExpandingNotification
                && !mExpandedInThisMotion
                && !mOnlyScrollingInThisMotion
                && !mDisallowDismissInThisMotion) {
            swipeWantsIt = mSwipeHelper.onInterceptTouchEvent(ev);
        }
        // Check if we need to clear any snooze leavebehinds
        boolean isUp = ev.getActionMasked() == MotionEvent.ACTION_UP;
        if (!NotificationSwipeHelper.isTouchInView(ev, guts) && isUp && !swipeWantsIt &&
                !expandWantsIt && !scrollWantsIt) {
            mCheckForLeavebehind = false;
            mNotificationGutsManager.closeAndSaveGuts(true /* removeLeavebehind */,
                    false /* force */, false /* removeControls */, -1 /* x */, -1 /* y */,
                    false /* resetMenu */);
        }
        if (ev.getActionMasked() == MotionEvent.ACTION_UP) {
            mCheckForLeavebehind = true;
        }
        return swipeWantsIt || scrollWantsIt || expandWantsIt || super.onInterceptTouchEvent(ev);
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private void handleEmptySpaceClick(MotionEvent ev) {
        switch (ev.getActionMasked()) {
            case MotionEvent.ACTION_MOVE:
                final float touchSlop = getTouchSlop(ev);
                if (mTouchIsClick && (Math.abs(ev.getY() - mInitialTouchY) > touchSlop
                        || Math.abs(ev.getX() - mInitialTouchX) > touchSlop)) {
                    mTouchIsClick = false;
                }
                break;
            case MotionEvent.ACTION_UP:
                if (mStatusBarState != StatusBarState.KEYGUARD && mTouchIsClick &&
                        isBelowLastNotification(mInitialTouchX, mInitialTouchY)) {
                    mOnEmptySpaceClickListener.onEmptySpaceClicked(mInitialTouchX, mInitialTouchY);
                }
                break;
        }
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private void initDownStates(MotionEvent ev) {
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            mExpandedInThisMotion = false;
            mOnlyScrollingInThisMotion = !mScroller.isFinished();
            mDisallowScrollingInThisMotion = false;
            mDisallowDismissInThisMotion = false;
            mTouchIsClick = true;
            mInitialTouchX = ev.getX();
            mInitialTouchY = ev.getY();
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.INPUT)
    public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
        super.requestDisallowInterceptTouchEvent(disallowIntercept);
        if (disallowIntercept) {
            cancelLongPress();
        }
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private boolean onInterceptTouchEventScroll(MotionEvent ev) {
        if (!isScrollingEnabled()) {
            return false;
        }
        /*
         * This method JUST determines whether we want to intercept the motion.
         * If we return true, onMotionEvent will be called and we do the actual
         * scrolling there.
         */

        /*
         * Shortcut the most recurring case: the user is in the dragging
         * state and is moving their finger.  We want to intercept this
         * motion.
         */
        final int action = ev.getAction();
        if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) {
            return true;
        }

        switch (action & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_MOVE: {
                /*
                 * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
                 * whether the user has moved far enough from the original down touch.
                 */

                /*
                 * Locally do absolute value. mLastMotionY is set to the y value
                 * of the down event.
                 */
                final int activePointerId = mActivePointerId;
                if (activePointerId == INVALID_POINTER) {
                    // If we don't have a valid id, the touch down wasn't on content.
                    break;
                }

                final int pointerIndex = ev.findPointerIndex(activePointerId);
                if (pointerIndex == -1) {
                    Log.e(TAG, "Invalid pointerId=" + activePointerId
                            + " in onInterceptTouchEvent");
                    break;
                }

                final int y = (int) ev.getY(pointerIndex);
                final int x = (int) ev.getX(pointerIndex);
                final int yDiff = Math.abs(y - mLastMotionY);
                final int xDiff = Math.abs(x - mDownX);
                if (yDiff > getTouchSlop(ev) && yDiff > xDiff) {
                    setIsBeingDragged(true);
                    mLastMotionY = y;
                    mDownX = x;
                    initVelocityTrackerIfNotExists();
                    mVelocityTracker.addMovement(ev);
                }
                break;
            }

            case MotionEvent.ACTION_DOWN: {
                final int y = (int) ev.getY();
                mScrolledToTopOnFirstDown = isScrolledToTop();
                final ExpandableView childAtTouchPos = getChildAtPosition(
                        ev.getX(), y, false /* requireMinHeight */, false /* ignoreDecors */);
                if (childAtTouchPos == null) {
                    setIsBeingDragged(false);
                    recycleVelocityTracker();
                    break;
                }

                /*
                 * Remember location of down touch.
                 * ACTION_DOWN always refers to pointer index 0.
                 */
                mLastMotionY = y;
                mDownX = (int) ev.getX();
                mActivePointerId = ev.getPointerId(0);

                initOrResetVelocityTracker();
                mVelocityTracker.addMovement(ev);
                /*
                 * If being flinged and user touches the screen, initiate drag;
                 * otherwise don't.  mScroller.isFinished should be false when
                 * being flinged.
                 */
                boolean isBeingDragged = !mScroller.isFinished();
                setIsBeingDragged(isBeingDragged);
                break;
            }

            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                /* Release the drag */
                setIsBeingDragged(false);
                mActivePointerId = INVALID_POINTER;
                recycleVelocityTracker();
                if (ANCHOR_SCROLLING) {
                    // TODO
                } else {
                    if (mScroller.springBack(mScrollX, mOwnScrollY, 0, 0, 0, getScrollRange())) {
                        animateScroll();
                    }
                }
                break;
            case MotionEvent.ACTION_POINTER_UP:
                onSecondaryPointerUp(ev);
                break;
        }

        /*
         * The only time we want to intercept motion events is if we are in the
         * drag mode.
         */
        return mIsBeingDragged;
    }

    /**
     * @return Whether the specified motion event is actually happening over the content.
     */
    @ShadeViewRefactor(RefactorComponent.INPUT)
    private boolean isInContentBounds(MotionEvent event) {
        return isInContentBounds(event.getY());
    }


    @VisibleForTesting
    @ShadeViewRefactor(RefactorComponent.INPUT)
    void setIsBeingDragged(boolean isDragged) {
        mIsBeingDragged = isDragged;
        if (isDragged) {
            requestDisallowInterceptTouchEvent(true);
            cancelLongPress();
            resetExposedMenuView(true /* animate */, true /* force */);
        }
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    public void requestDisallowLongPress() {
        cancelLongPress();
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    public void requestDisallowDismiss() {
        mDisallowDismissInThisMotion = true;
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    public void cancelLongPress() {
        mSwipeHelper.cancelLongPress();
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    public void setOnEmptySpaceClickListener(OnEmptySpaceClickListener listener) {
        mOnEmptySpaceClickListener = listener;
    }

    /** @hide */
    @Override
    @ShadeViewRefactor(RefactorComponent.INPUT)
    public boolean performAccessibilityActionInternal(int action, Bundle arguments) {
        if (super.performAccessibilityActionInternal(action, arguments)) {
            return true;
        }
        if (!isEnabled()) {
            return false;
        }
        int direction = -1;
        switch (action) {
            case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD:
                // fall through
            case android.R.id.accessibilityActionScrollDown:
                direction = 1;
                // fall through
            case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD:
                // fall through
            case android.R.id.accessibilityActionScrollUp:
                if (ANCHOR_SCROLLING) {
                    // TODO
                } else {
                    final int viewportHeight =
                            getHeight() - mPaddingBottom - mTopPadding - mPaddingTop
                                    - mShelf.getIntrinsicHeight();
                    final int targetScrollY = Math.max(0,
                            Math.min(mOwnScrollY + direction * viewportHeight, getScrollRange()));
                    if (targetScrollY != mOwnScrollY) {
                        mScroller.startScroll(mScrollX, mOwnScrollY, 0,
                                targetScrollY - mOwnScrollY);
                        animateScroll();
                        return true;
                    }
                }
                break;
        }
        return false;
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    public void closeControlsIfOutsideTouch(MotionEvent ev) {
        NotificationGuts guts = mNotificationGutsManager.getExposedGuts();
        NotificationMenuRowPlugin menuRow = mSwipeHelper.getCurrentMenuRow();
        View translatingParentView = mSwipeHelper.getTranslatingParentView();
        View view = null;
        if (guts != null && !guts.getGutsContent().isLeavebehind()) {
            // Only close visible guts if they're not a leavebehind.
            view = guts;
        } else if (menuRow != null && menuRow.isMenuVisible()
                && translatingParentView != null) {
            // Checking menu
            view = translatingParentView;
        }
        if (view != null && !NotificationSwipeHelper.isTouchInView(ev, view)) {
            // Touch was outside visible guts / menu notification, close what's visible
            mNotificationGutsManager.closeAndSaveGuts(false /* removeLeavebehind */,
                    false /* force */, true /* removeControls */, -1 /* x */, -1 /* y */,
                    false /* resetMenu */);
            resetExposedMenuView(true /* animate */, true /* force */);
        }
    }

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private void setSwipingInProgress(boolean swiping) {
        mSwipingInProgress = swiping;
        if (swiping) {
            requestDisallowInterceptTouchEvent(true);
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void onWindowFocusChanged(boolean hasWindowFocus) {
        super.onWindowFocusChanged(hasWindowFocus);
        if (!hasWindowFocus) {
            cancelLongPress();
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void clearChildFocus(View child) {
        super.clearChildFocus(child);
        if (mForcedScroll == child) {
            mForcedScroll = null;
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public boolean isScrolledToTop() {
        if (ANCHOR_SCROLLING) {
            updateScrollAnchor();
            // TODO: once we're recycling this will need to check the adapter position of the child
            return mScrollAnchorView == getFirstChildNotGone() && mScrollAnchorViewY >= 0;
        } else {
            return mOwnScrollY == 0;
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public boolean isScrolledToBottom() {
        if (ANCHOR_SCROLLING) {
            return getMaxPositiveScrollAmount() <= 0;
        } else {
            return mOwnScrollY >= getScrollRange();
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public View getHostView() {
        return this;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public int getEmptyBottomMargin() {
        return Math.max(mMaxLayoutHeight - mContentHeight, 0);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void checkSnoozeLeavebehind() {
        if (mCheckForLeavebehind) {
            mNotificationGutsManager.closeAndSaveGuts(true /* removeLeavebehind */,
                    false /* force */, false /* removeControls */, -1 /* x */, -1 /* y */,
                    false /* resetMenu */);
            mCheckForLeavebehind = false;
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void resetCheckSnoozeLeavebehind() {
        mCheckForLeavebehind = true;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void onExpansionStarted() {
        mIsExpansionChanging = true;
        mAmbientState.setExpansionChanging(true);
        checkSnoozeLeavebehind();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void onExpansionStopped() {
        mIsExpansionChanging = false;
        resetCheckSnoozeLeavebehind();
        mAmbientState.setExpansionChanging(false);
        if (!mIsExpanded) {
            resetScrollPosition();
            mStatusBar.resetUserExpandedStates();
            clearTemporaryViews();
            clearUserLockedViews();
            ArrayList<ExpandableView> draggedViews = mAmbientState.getDraggedViews();
            if (draggedViews.size() > 0) {
                draggedViews.clear();
                updateContinuousShadowDrawing();
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void clearUserLockedViews() {
        for (int i = 0; i < getChildCount(); i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            if (child instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) child;
                row.setUserLocked(false);
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void clearTemporaryViews() {
        // lets make sure nothing is transient anymore
        clearTemporaryViewsInGroup(this);
        for (int i = 0; i < getChildCount(); i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            if (child instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) child;
                clearTemporaryViewsInGroup(row.getChildrenContainer());
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void clearTemporaryViewsInGroup(ViewGroup viewGroup) {
        while (viewGroup != null && viewGroup.getTransientViewCount() != 0) {
            viewGroup.removeTransientView(viewGroup.getTransientView(0));
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void onPanelTrackingStarted() {
        mPanelTracking = true;
        mAmbientState.setPanelTracking(true);
        resetExposedMenuView(true /* animate */, true /* force */);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void onPanelTrackingStopped() {
        mPanelTracking = false;
        mAmbientState.setPanelTracking(false);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void resetScrollPosition() {
        mScroller.abortAnimation();
        if (ANCHOR_SCROLLING) {
            // TODO: once we're recycling this will need to modify the adapter position instead
            mScrollAnchorView = getFirstChildNotGone();
            mScrollAnchorViewY = 0;
            updateOnScrollChange();
        } else {
            setOwnScrollY(0);
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void setIsExpanded(boolean isExpanded) {
        boolean changed = isExpanded != mIsExpanded;
        mIsExpanded = isExpanded;
        mStackScrollAlgorithm.setIsExpanded(isExpanded);
        mAmbientState.setShadeExpanded(isExpanded);
        mStateAnimator.setShadeExpanded(isExpanded);
        mSwipeHelper.setIsExpanded(isExpanded);
        if (changed) {
            mWillExpand = false;
            if (!mIsExpanded) {
                mGroupManager.collapseAllGroups();
                mExpandHelper.cancelImmediately();
            }
            updateNotificationAnimationStates();
            updateChronometers();
            requestChildrenUpdate();
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void updateChronometers() {
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            updateChronometerForChild(getChildAt(i));
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void updateChronometerForChild(View child) {
        if (child instanceof ExpandableNotificationRow) {
            ExpandableNotificationRow row = (ExpandableNotificationRow) child;
            row.setChronometerRunning(mIsExpanded);
        }
    }

    @Override
    public void onHeightChanged(ExpandableView view, boolean needsAnimation) {
        updateContentHeight();
        updateScrollPositionOnExpandInBottom(view);
        clampScrollPosition();
        notifyHeightChangeListener(view, needsAnimation);
        ExpandableNotificationRow row = view instanceof ExpandableNotificationRow
                ? (ExpandableNotificationRow) view
                : null;
        NotificationSection firstSection = getFirstVisibleSection();
        ActivatableNotificationView firstVisibleChild =
                firstSection == null ? null : firstSection.getFirstVisibleChild();
        if (row != null) {
            if (row == firstVisibleChild
                    || row.getNotificationParent() == firstVisibleChild) {
                updateAlgorithmLayoutMinHeight();
            }
        }
        if (needsAnimation) {
            requestAnimationOnViewResize(row);
        }
        requestChildrenUpdate();
    }

    @Override
    public void onReset(ExpandableView view) {
        updateAnimationState(view);
        updateChronometerForChild(view);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateScrollPositionOnExpandInBottom(ExpandableView view) {
        if (view instanceof ExpandableNotificationRow && !onKeyguard()) {
            ExpandableNotificationRow row = (ExpandableNotificationRow) view;
            // TODO: once we're recycling this will need to check the adapter position of the child
            if (row.isUserLocked() && row != getFirstChildNotGone()) {
                if (row.isSummaryWithChildren()) {
                    return;
                }
                // We are actually expanding this view
                float endPosition = row.getTranslationY() + row.getActualHeight();
                if (row.isChildInGroup()) {
                    endPosition += row.getNotificationParent().getTranslationY();
                }
                int layoutEnd = mMaxLayoutHeight + (int) mStackTranslation;
                NotificationSection lastSection = getLastVisibleSection();
                ActivatableNotificationView lastVisibleChild =
                        lastSection == null ? null : lastSection.getLastVisibleChild();
                if (row != lastVisibleChild && mShelf.getVisibility() != GONE) {
                    layoutEnd -= mShelf.getIntrinsicHeight() + mPaddingBetweenElements;
                }
                if (endPosition > layoutEnd) {
                    if (ANCHOR_SCROLLING) {
                        mScrollAnchorViewY -= (endPosition - layoutEnd);
                        updateScrollAnchor();
                        updateOnScrollChange();
                    } else {
                        setOwnScrollY((int) (mOwnScrollY + endPosition - layoutEnd));
                    }
                    mDisallowScrollingInThisMotion = true;
                }
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setOnHeightChangedListener(
            ExpandableView.OnHeightChangedListener onHeightChangedListener) {
        this.mOnHeightChangedListener = onHeightChangedListener;
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void onChildAnimationFinished() {
        setAnimationRunning(false);
        requestChildrenUpdate();
        runAnimationFinishedRunnables();
        clearTransient();
        clearHeadsUpDisappearRunning();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void clearHeadsUpDisappearRunning() {
        for (int i = 0; i < getChildCount(); i++) {
            View view = getChildAt(i);
            if (view instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) view;
                row.setHeadsUpAnimatingAway(false);
                if (row.isSummaryWithChildren()) {
                    for (ExpandableNotificationRow child : row.getNotificationChildren()) {
                        child.setHeadsUpAnimatingAway(false);
                    }
                }
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void clearTransient() {
        for (ExpandableView view : mClearTransientViewsWhenFinished) {
            StackStateAnimator.removeTransientView(view);
        }
        mClearTransientViewsWhenFinished.clear();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void runAnimationFinishedRunnables() {
        for (Runnable runnable : mAnimationFinishedRunnables) {
            runnable.run();
        }
        mAnimationFinishedRunnables.clear();
    }

    /**
     * See {@link AmbientState#setDimmed}.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setDimmed(boolean dimmed, boolean animate) {
        dimmed &= onKeyguard();
        mAmbientState.setDimmed(dimmed);
        if (animate && mAnimationsEnabled) {
            mDimmedNeedsAnimation = true;
            mNeedsAnimation = true;
            animateDimmed(dimmed);
        } else {
            setDimAmount(dimmed ? 1.0f : 0.0f);
        }
        requestChildrenUpdate();
    }

    @VisibleForTesting
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    boolean isDimmed() {
        return mAmbientState.isDimmed();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void setDimAmount(float dimAmount) {
        mDimAmount = dimAmount;
        updateBackgroundDimming();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void animateDimmed(boolean dimmed) {
        if (mDimAnimator != null) {
            mDimAnimator.cancel();
        }
        float target = dimmed ? 1.0f : 0.0f;
        if (target == mDimAmount) {
            return;
        }
        mDimAnimator = TimeAnimator.ofFloat(mDimAmount, target);
        mDimAnimator.setDuration(StackStateAnimator.ANIMATION_DURATION_DIMMED_ACTIVATED);
        mDimAnimator.setInterpolator(Interpolators.FAST_OUT_SLOW_IN);
        mDimAnimator.addListener(mDimEndListener);
        mDimAnimator.addUpdateListener(mDimUpdateListener);
        mDimAnimator.start();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void updateSensitiveness(boolean animate) {
        boolean hideSensitive = mLockscreenUserManager.isAnyProfilePublicMode();
        if (hideSensitive != mAmbientState.isHideSensitive()) {
            int childCount = getChildCount();
            for (int i = 0; i < childCount; i++) {
                ExpandableView v = (ExpandableView) getChildAt(i);
                v.setHideSensitiveForIntrinsicHeight(hideSensitive);
            }
            mAmbientState.setHideSensitive(hideSensitive);
            if (animate && mAnimationsEnabled) {
                mHideSensitiveNeedsAnimation = true;
                mNeedsAnimation = true;
            }
            updateContentHeight();
            requestChildrenUpdate();
        }
    }

    /**
     * See {@link AmbientState#setActivatedChild}.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setActivatedChild(ActivatableNotificationView activatedChild) {
        mAmbientState.setActivatedChild(activatedChild);
        if (mAnimationsEnabled) {
            mActivateNeedsAnimation = true;
            mNeedsAnimation = true;
        }
        requestChildrenUpdate();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public ActivatableNotificationView getActivatedChild() {
        return mAmbientState.getActivatedChild();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void applyCurrentState() {
        int numChildren = getChildCount();
        for (int i = 0; i < numChildren; i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            child.applyViewState();
        }

        if (mListener != null) {
            mListener.onChildLocationsChanged();
        }
        runAnimationFinishedRunnables();
        setAnimationRunning(false);
        updateBackground();
        updateViewShadows();
        updateClippingToTopRoundedCorner();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateViewShadows() {
        // we need to work around an issue where the shadow would not cast between siblings when
        // their z difference is between 0 and 0.1

        // Lefts first sort by Z difference
        for (int i = 0; i < getChildCount(); i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            if (child.getVisibility() != GONE) {
                mTmpSortedChildren.add(child);
            }
        }
        Collections.sort(mTmpSortedChildren, mViewPositionComparator);

        // Now lets update the shadow for the views
        ExpandableView previous = null;
        for (int i = 0; i < mTmpSortedChildren.size(); i++) {
            ExpandableView expandableView = mTmpSortedChildren.get(i);
            float translationZ = expandableView.getTranslationZ();
            float otherZ = previous == null ? translationZ : previous.getTranslationZ();
            float diff = otherZ - translationZ;
            if (diff <= 0.0f || diff >= FakeShadowView.SHADOW_SIBLING_TRESHOLD) {
                // There is no fake shadow to be drawn
                expandableView.setFakeShadowIntensity(0.0f, 0.0f, 0, 0);
            } else {
                float yLocation = previous.getTranslationY() + previous.getActualHeight() -
                        expandableView.getTranslationY() - previous.getExtraBottomPadding();
                expandableView.setFakeShadowIntensity(
                        diff / FakeShadowView.SHADOW_SIBLING_TRESHOLD,
                        previous.getOutlineAlpha(), (int) yLocation,
                        previous.getOutlineTranslation());
            }
            previous = expandableView;
        }

        mTmpSortedChildren.clear();
    }

    /**
     * Update colors of "dismiss" and "empty shade" views.
     *
     * @param lightTheme True if light theme should be used.
     */
    @ShadeViewRefactor(RefactorComponent.DECORATOR)
    public void updateDecorViews(boolean lightTheme) {
        if (lightTheme == mUsingLightTheme) {
            return;
        }
        mUsingLightTheme = lightTheme;
        Context context = new ContextThemeWrapper(mContext,
                lightTheme ? R.style.Theme_SystemUI_Light : R.style.Theme_SystemUI);
        final int textColor = Utils.getColorAttrDefaultColor(context, R.attr.wallpaperTextColor);
        mFooterView.setTextColor(textColor);
        mEmptyShadeView.setTextColor(textColor);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void goToFullShade(long delay) {
        mGoToFullShadeNeedsAnimation = true;
        mGoToFullShadeDelay = delay;
        mNeedsAnimation = true;
        requestChildrenUpdate();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void cancelExpandHelper() {
        mExpandHelper.cancel();
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public void setIntrinsicPadding(int intrinsicPadding) {
        mIntrinsicPadding = intrinsicPadding;
        mAmbientState.setIntrinsicPadding(intrinsicPadding);
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public int getIntrinsicPadding() {
        return mIntrinsicPadding;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean shouldDelayChildPressedState() {
        return true;
    }

    /**
     * See {@link AmbientState#setDozing}.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setDozing(boolean dozing, boolean animate,
            @Nullable PointF touchWakeUpScreenLocation) {
        if (mAmbientState.isDozing() == dozing) {
            return;
        }
        mAmbientState.setDozing(dozing);
        requestChildrenUpdate();
        notifyHeightChangeListener(mShelf);
    }

    /**
     * Sets the current hide amount.
     *
     * @param linearHideAmount       The hide amount that follows linear interpoloation in the
     *                               animation,
     *                               i.e. animates from 0 to 1 or vice-versa in a linear manner.
     * @param interpolatedHideAmount The hide amount that follows the actual interpolation of the
     *                               animation curve.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setHideAmount(float linearHideAmount, float interpolatedHideAmount) {
        mLinearHideAmount = linearHideAmount;
        mInterpolatedHideAmount = interpolatedHideAmount;
        boolean wasFullyHidden = mAmbientState.isFullyHidden();
        boolean wasHiddenAtAll = mAmbientState.isHiddenAtAll();
        mAmbientState.setHideAmount(interpolatedHideAmount);
        boolean nowFullyHidden = mAmbientState.isFullyHidden();
        boolean nowHiddenAtAll = mAmbientState.isHiddenAtAll();
        if (nowFullyHidden != wasFullyHidden) {
            updateVisibility();
        }
        if (!wasHiddenAtAll && nowHiddenAtAll) {
            resetExposedMenuView(true /* animate */, true /* animate */);
        }
        if (nowFullyHidden != wasFullyHidden || wasHiddenAtAll != nowHiddenAtAll) {
            invalidateOutline();
        }
        updateAlgorithmHeightAndPadding();
        updateBackgroundDimming();
        requestChildrenUpdate();
        updateOwnTranslationZ();
    }

    private void updateOwnTranslationZ() {
        // Since we are clipping to the outline we need to make sure that the shadows aren't
        // clipped when pulsing
        float ownTranslationZ = 0;
        if (mKeyguardBypassController.getBypassEnabled() && mAmbientState.isHiddenAtAll()) {
            ExpandableView firstChildNotGone = getFirstChildNotGone();
            if (firstChildNotGone != null && firstChildNotGone.showingPulsing()) {
                ownTranslationZ = firstChildNotGone.getTranslationZ();
            }
        }
        setTranslationZ(ownTranslationZ);
    }

    private void updateVisibility() {
        boolean shouldShow = !mAmbientState.isFullyHidden() || !onKeyguard();
        setVisibility(shouldShow ? View.VISIBLE : View.INVISIBLE);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void notifyHideAnimationStart(boolean hide) {
        // We only swap the scaling factor if we're fully hidden or fully awake to avoid
        // interpolation issues when playing with the power button.
        if (mInterpolatedHideAmount == 0 || mInterpolatedHideAmount == 1) {
            mBackgroundXFactor = hide ? 1.8f : 1.5f;
            mHideXInterpolator = hide
                    ? Interpolators.FAST_OUT_SLOW_IN_REVERSE
                    : Interpolators.FAST_OUT_SLOW_IN;
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private int getNotGoneIndex(View child) {
        int count = getChildCount();
        int notGoneIndex = 0;
        for (int i = 0; i < count; i++) {
            View v = getChildAt(i);
            if (child == v) {
                return notGoneIndex;
            }
            if (v.getVisibility() != View.GONE) {
                notGoneIndex++;
            }
        }
        return -1;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setFooterView(@NonNull FooterView footerView) {
        int index = -1;
        if (mFooterView != null) {
            index = indexOfChild(mFooterView);
            removeView(mFooterView);
        }
        mFooterView = footerView;
        addView(mFooterView, index);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setEmptyShadeView(EmptyShadeView emptyShadeView) {
        int index = -1;
        if (mEmptyShadeView != null) {
            index = indexOfChild(mEmptyShadeView);
            removeView(mEmptyShadeView);
        }
        mEmptyShadeView = emptyShadeView;
        addView(mEmptyShadeView, index);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void updateEmptyShadeView(boolean visible) {
        mEmptyShadeView.setVisible(visible, mIsExpanded && mAnimationsEnabled);

        int oldTextRes = mEmptyShadeView.getTextResource();
        int newTextRes = mZenController.areNotificationsHiddenInShade()
                ? R.string.dnd_suppressing_shade_text : R.string.empty_shade_text;
        if (oldTextRes != newTextRes) {
            mEmptyShadeView.setText(newTextRes);
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void updateFooterView(boolean visible, boolean showDismissView) {
        if (mFooterView == null) {
            return;
        }
        boolean animate = mIsExpanded && mAnimationsEnabled;
        mFooterView.setVisible(visible, animate);
        mFooterView.setSecondaryVisible(showDismissView, animate);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setDismissAllInProgress(boolean dismissAllInProgress) {
        mDismissAllInProgress = dismissAllInProgress;
        mAmbientState.setDismissAllInProgress(dismissAllInProgress);
        handleDismissAllClipping();
    }

    @ShadeViewRefactor(RefactorComponent.ADAPTER)
    private void handleDismissAllClipping() {
        final int count = getChildCount();
        boolean previousChildWillBeDismissed = false;
        for (int i = 0; i < count; i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            if (child.getVisibility() == GONE) {
                continue;
            }
            if (mDismissAllInProgress && previousChildWillBeDismissed) {
                child.setMinClipTopAmount(child.getClipTopAmount());
            } else {
                child.setMinClipTopAmount(0);
            }
            previousChildWillBeDismissed = canChildBeDismissed(child);
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean isFooterViewNotGone() {
        return mFooterView != null
                && mFooterView.getVisibility() != View.GONE
                && !mFooterView.willBeGone();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean isFooterViewContentVisible() {
        return mFooterView != null && mFooterView.isContentVisible();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public int getFooterViewHeight() {
        return mFooterView == null ? 0 : mFooterView.getHeight() + mPaddingBetweenElements;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public int getEmptyShadeViewHeight() {
        return mEmptyShadeView.getHeight();
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public float getBottomMostNotificationBottom() {
        final int count = getChildCount();
        float max = 0;
        for (int childIdx = 0; childIdx < count; childIdx++) {
            ExpandableView child = (ExpandableView) getChildAt(childIdx);
            if (child.getVisibility() == GONE) {
                continue;
            }
            float bottom = child.getTranslationY() + child.getActualHeight()
                    - child.getClipBottomAmount();
            if (bottom > max) {
                max = bottom;
            }
        }
        return max + getStackTranslation();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setStatusBar(StatusBar statusBar) {
        this.mStatusBar = statusBar;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setGroupManager(NotificationGroupManager groupManager) {
        this.mGroupManager = groupManager;
        mGroupManager.addOnGroupChangeListener(mOnGroupChangeListener);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void requestAnimateEverything() {
        if (mIsExpanded && mAnimationsEnabled) {
            mEverythingNeedsAnimation = true;
            mNeedsAnimation = true;
            requestChildrenUpdate();
        }
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public boolean isBelowLastNotification(float touchX, float touchY) {
        int childCount = getChildCount();
        for (int i = childCount - 1; i >= 0; i--) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            if (child.getVisibility() != View.GONE) {
                float childTop = child.getY();
                if (childTop > touchY) {
                    // we are above a notification entirely let's abort
                    return false;
                }
                boolean belowChild = touchY > childTop + child.getActualHeight()
                        - child.getClipBottomAmount();
                if (child == mFooterView) {
                    if (!belowChild && !mFooterView.isOnEmptySpace(touchX - mFooterView.getX(),
                            touchY - childTop)) {
                        // We clicked on the dismiss button
                        return false;
                    }
                } else if (child == mEmptyShadeView) {
                    // We arrived at the empty shade view, for which we accept all clicks
                    return true;
                } else if (!belowChild) {
                    // We are on a child
                    return false;
                }
            }
        }
        return touchY > mTopPadding + mStackTranslation;
    }

    /** @hide */
    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
        super.onInitializeAccessibilityEventInternal(event);
        event.setScrollable(mScrollable);
        event.setMaxScrollX(mScrollX);
        if (ANCHOR_SCROLLING) {
            // TODO
        } else {
            event.setScrollY(mOwnScrollY);
            event.setMaxScrollY(getScrollRange());
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
        super.onInitializeAccessibilityNodeInfoInternal(info);
        if (mScrollable) {
            info.setScrollable(true);
            if (mBackwardScrollable) {
                info.addAction(
                        AccessibilityNodeInfo.AccessibilityAction.ACTION_SCROLL_BACKWARD);
                info.addAction(AccessibilityNodeInfo.AccessibilityAction.ACTION_SCROLL_UP);
            }
            if (mForwardScrollable) {
                info.addAction(AccessibilityNodeInfo.AccessibilityAction.ACTION_SCROLL_FORWARD);
                info.addAction(AccessibilityNodeInfo.AccessibilityAction.ACTION_SCROLL_DOWN);
            }
        }
        // Talkback only listenes to scroll events of certain classes, let's make us a scrollview
        info.setClassName(ScrollView.class.getName());
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public void generateChildOrderChangedEvent() {
        if (mIsExpanded && mAnimationsEnabled) {
            mGenerateChildOrderChangedEvent = true;
            mNeedsAnimation = true;
            requestChildrenUpdate();
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public int getContainerChildCount() {
        return getChildCount();
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public View getContainerChildAt(int i) {
        return getChildAt(i);
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void removeContainerView(View v) {
        Assert.isMainThread();
        removeView(v);
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void removeListItem(NotificationListItem v) {
        removeContainerView(v.getView());
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void addContainerView(View v) {
        Assert.isMainThread();
        addView(v);
    }

    @Override
    public void addListItem(NotificationListItem v) {
        addContainerView(v.getView());
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void runAfterAnimationFinished(Runnable runnable) {
        mAnimationFinishedRunnables.add(runnable);
    }

    public void generateHeadsUpAnimation(NotificationEntry entry, boolean isHeadsUp) {
        ExpandableNotificationRow row = entry.getHeadsUpAnimationView();
        generateHeadsUpAnimation(row, isHeadsUp);
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void generateHeadsUpAnimation(ExpandableNotificationRow row, boolean isHeadsUp) {
        if (mAnimationsEnabled && (isHeadsUp || mHeadsUpGoingAwayAnimationsAllowed)) {
            mHeadsUpChangeAnimations.add(new Pair<>(row, isHeadsUp));
            mNeedsAnimation = true;
            if (!mIsExpanded && !mWillExpand && !isHeadsUp) {
                row.setHeadsUpAnimatingAway(true);
            }
            requestChildrenUpdate();
        }
    }

    /**
     * Set the boundary for the bottom heads up position. The heads up will always be above this
     * position.
     *
     * @param height          the height of the screen
     * @param bottomBarHeight the height of the bar on the bottom
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setHeadsUpBoundaries(int height, int bottomBarHeight) {
        mAmbientState.setMaxHeadsUpTranslation(height - bottomBarHeight);
        mStateAnimator.setHeadsUpAppearHeightBottom(height);
        requestChildrenUpdate();
    }

    @Override
    public void setWillExpand(boolean willExpand) {
        mWillExpand = willExpand;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setTrackingHeadsUp(ExpandableNotificationRow row) {
        mTrackingHeadsUp = row != null;
        mRoundnessManager.setTrackingHeadsUp(row);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setScrimController(ScrimController scrimController) {
        mScrimController = scrimController;
        mScrimController.setScrimBehindChangeRunnable(this::updateBackgroundDimming);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void forceNoOverlappingRendering(boolean force) {
        mForceNoOverlappingRendering = force;
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean hasOverlappingRendering() {
        return !mForceNoOverlappingRendering && super.hasOverlappingRendering();
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void setAnimationRunning(boolean animationRunning) {
        if (animationRunning != mAnimationRunning) {
            if (animationRunning) {
                getViewTreeObserver().addOnPreDrawListener(mRunningAnimationUpdater);
            } else {
                getViewTreeObserver().removeOnPreDrawListener(mRunningAnimationUpdater);
            }
            mAnimationRunning = animationRunning;
            updateContinuousShadowDrawing();
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean isExpanded() {
        return mIsExpanded;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setPulsing(boolean pulsing, boolean animated) {
        if (!mPulsing && !pulsing) {
            return;
        }
        mPulsing = pulsing;
        mAmbientState.setPulsing(pulsing);
        mSwipeHelper.setPulsing(pulsing);
        updateNotificationAnimationStates();
        updateAlgorithmHeightAndPadding();
        updateContentHeight();
        requestChildrenUpdate();
        notifyHeightChangeListener(null, animated);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setQsExpanded(boolean qsExpanded) {
        mQsExpanded = qsExpanded;
        updateAlgorithmLayoutMinHeight();
        updateScrollability();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setQsExpansionFraction(float qsExpansionFraction) {
        mQsExpansionFraction = qsExpansionFraction;
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    private void setOwnScrollY(int ownScrollY) {
        assert !ANCHOR_SCROLLING;
        if (ownScrollY != mOwnScrollY) {
            // We still want to call the normal scrolled changed for accessibility reasons
            onScrollChanged(mScrollX, ownScrollY, mScrollX, mOwnScrollY);
            mOwnScrollY = ownScrollY;
            updateOnScrollChange();
        }
    }

    private void updateOnScrollChange() {
        updateForwardAndBackwardScrollability();
        requestChildrenUpdate();
    }

    private void updateScrollAnchor() {
        int anchorIndex = indexOfChild(mScrollAnchorView);
        // If the anchor view has been scrolled off the top, move to the next view.
        while (mScrollAnchorViewY < 0) {
            View nextAnchor = null;
            for (int i = anchorIndex + 1; i < getChildCount(); i++) {
                View child = getChildAt(i);
                if (child.getVisibility() != View.GONE
                        && child instanceof ExpandableNotificationRow) {
                    anchorIndex = i;
                    nextAnchor = child;
                    break;
                }
            }
            if (nextAnchor == null) {
                break;
            }
            mScrollAnchorViewY +=
                    (int) (nextAnchor.getTranslationY() - mScrollAnchorView.getTranslationY());
            mScrollAnchorView = nextAnchor;
        }
        // If the view above the anchor view is fully visible, make it the anchor view.
        while (anchorIndex > 0 && mScrollAnchorViewY > 0) {
            View prevAnchor = null;
            for (int i = anchorIndex - 1; i >= 0; i--) {
                View child = getChildAt(i);
                if (child.getVisibility() != View.GONE
                        && child instanceof ExpandableNotificationRow) {
                    anchorIndex = i;
                    prevAnchor = child;
                    break;
                }
            }
            if (prevAnchor == null) {
                break;
            }
            float distanceToPreviousAnchor =
                    mScrollAnchorView.getTranslationY() - prevAnchor.getTranslationY();
            if (distanceToPreviousAnchor < mScrollAnchorViewY) {
                mScrollAnchorViewY -= (int) distanceToPreviousAnchor;
                mScrollAnchorView = prevAnchor;
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setShelf(NotificationShelf shelf) {
        int index = -1;
        if (mShelf != null) {
            index = indexOfChild(mShelf);
            removeView(mShelf);
        }
        mShelf = shelf;
        addView(mShelf, index);
        mAmbientState.setShelf(shelf);
        mStateAnimator.setShelf(shelf);
        shelf.bind(mAmbientState, this);
        if (ANCHOR_SCROLLING) {
            mScrollAnchorView = mShelf;
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public NotificationShelf getNotificationShelf() {
        return mShelf;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setMaxDisplayedNotifications(int maxDisplayedNotifications) {
        if (mMaxDisplayedNotifications != maxDisplayedNotifications) {
            mMaxDisplayedNotifications = maxDisplayedNotifications;
            updateContentHeight();
            notifyHeightChangeListener(mShelf);
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setShouldShowShelfOnly(boolean shouldShowShelfOnly) {
        mShouldShowShelfOnly = shouldShowShelfOnly;
        updateAlgorithmLayoutMinHeight();
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public int getMinExpansionHeight() {
        return mShelf.getIntrinsicHeight()
                - (mShelf.getIntrinsicHeight() - mStatusBarHeight + mWaterfallTopInset) / 2
                + mWaterfallTopInset;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setInHeadsUpPinnedMode(boolean inHeadsUpPinnedMode) {
        mInHeadsUpPinnedMode = inHeadsUpPinnedMode;
        updateClipping();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setHeadsUpAnimatingAway(boolean headsUpAnimatingAway) {
        mHeadsUpAnimatingAway = headsUpAnimatingAway;
        updateClipping();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    @VisibleForTesting
    protected void setStatusBarState(int statusBarState) {
        mStatusBarState = statusBarState;
        mAmbientState.setStatusBarState(statusBarState);
    }

    private void onStatePostChange() {
        boolean onKeyguard = onKeyguard();

        if (mHeadsUpAppearanceController != null) {
            mHeadsUpAppearanceController.onStateChanged();
        }

        SysuiStatusBarStateController state = (SysuiStatusBarStateController)
                Dependency.get(StatusBarStateController.class);
        updateSensitiveness(state.goingToFullShade() /* animate */);
        setDimmed(onKeyguard, state.fromShadeLocked() /* animate */);
        setExpandingEnabled(!onKeyguard);
        ActivatableNotificationView activatedChild = getActivatedChild();
        setActivatedChild(null);
        if (activatedChild != null) {
            activatedChild.makeInactive(false /* animate */);
        }
        updateFooter();
        requestChildrenUpdate();
        onUpdateRowStates();

        mEntryManager.updateNotifications("StatusBar state changed");
        updateVisibility();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setExpandingVelocity(float expandingVelocity) {
        mAmbientState.setExpandingVelocity(expandingVelocity);
    }

    @ShadeViewRefactor(RefactorComponent.COORDINATOR)
    public float getOpeningHeight() {
        if (mEmptyShadeView.getVisibility() == GONE) {
            return getMinExpansionHeight();
        } else {
            return getAppearEndPosition();
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setIsFullWidth(boolean isFullWidth) {
        mAmbientState.setPanelFullWidth(isFullWidth);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setUnlockHintRunning(boolean running) {
        mAmbientState.setUnlockHintRunning(running);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setQsCustomizerShowing(boolean isShowing) {
        mAmbientState.setQsCustomizerShowing(isShowing);
        requestChildrenUpdate();
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setHeadsUpGoingAwayAnimationsAllowed(boolean headsUpGoingAwayAnimationsAllowed) {
        mHeadsUpGoingAwayAnimationsAllowed = headsUpGoingAwayAnimationsAllowed;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        pw.println(String.format("[%s: pulsing=%s qsCustomizerShowing=%s visibility=%s"
                        + " alpha:%f scrollY:%d maxTopPadding:%d showShelfOnly=%s"
                        + " qsExpandFraction=%f]",
                this.getClass().getSimpleName(),
                mPulsing ? "T" : "f",
                mAmbientState.isQsCustomizerShowing() ? "T" : "f",
                getVisibility() == View.VISIBLE ? "visible"
                        : getVisibility() == View.GONE ? "gone"
                                : "invisible",
                getAlpha(),
                mAmbientState.getScrollY(),
                mMaxTopPadding,
                mShouldShowShelfOnly ? "T" : "f",
                mQsExpansionFraction));
        int childCount = getChildCount();
        pw.println("  Number of children: " + childCount);
        pw.println();

        for (int i = 0; i < childCount; i++) {
            ExpandableView child = (ExpandableView) getChildAt(i);
            child.dump(fd, pw, args);
            if (!(child instanceof ExpandableNotificationRow)) {
                pw.println("  " + child.getClass().getSimpleName());
                // Notifications dump it's viewstate as part of their dump to support children
                ExpandableViewState viewState = child.getViewState();
                if (viewState == null) {
                    pw.println("    no viewState!!!");
                } else {
                    pw.print("    ");
                    viewState.dump(fd, pw, args);
                    pw.println();
                    pw.println();
                }
            }
        }
        int transientViewCount = getTransientViewCount();
        pw.println("  Transient Views: " + transientViewCount);
        for (int i = 0; i < transientViewCount; i++) {
            ExpandableView child = (ExpandableView) getTransientView(i);
            child.dump(fd, pw, args);
        }
        ArrayList<ExpandableView> draggedViews = mAmbientState.getDraggedViews();
        int draggedCount = draggedViews.size();
        pw.println("  Dragged Views: " + draggedCount);
        for (int i = 0; i < draggedCount; i++) {
            ExpandableView child = (ExpandableView) draggedViews.get(i);
            child.dump(fd, pw, args);
        }
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public boolean isFullyHidden() {
        return mAmbientState.isFullyHidden();
    }

    /**
     * Add a listener whenever the expanded height changes. The first value passed as an
     * argument is the expanded height and the second one is the appearFraction.
     *
     * @param listener the listener to notify.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void addOnExpandedHeightChangedListener(BiConsumer<Float, Float> listener) {
        mExpandedHeightListeners.add(listener);
    }

    /**
     * Stop a listener from listening to the expandedHeight.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void removeOnExpandedHeightChangedListener(BiConsumer<Float, Float> listener) {
        mExpandedHeightListeners.remove(listener);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setHeadsUpAppearanceController(
            HeadsUpAppearanceController headsUpAppearanceController) {
        mHeadsUpAppearanceController = headsUpAppearanceController;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setIconAreaController(NotificationIconAreaController controller) {
        mIconAreaController = controller;
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void manageNotifications(View v) {
        Intent intent = new Intent(Settings.ACTION_NOTIFICATION_HISTORY);
        mStatusBar.startActivity(intent, true, true, Intent.FLAG_ACTIVITY_SINGLE_TOP);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    @VisibleForTesting
    void clearNotifications(
            @SelectedRows int selection,
            boolean closeShade) {
        // animate-swipe all dismissable notifications, then animate the shade closed
        int numChildren = getChildCount();

        final ArrayList<View> viewsToHide = new ArrayList<>(numChildren);
        final ArrayList<ExpandableNotificationRow> viewsToRemove = new ArrayList<>(numChildren);
        for (int i = 0; i < numChildren; i++) {
            final View child = getChildAt(i);
            if (child instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) child;
                boolean parentVisible = false;
                boolean hasClipBounds = child.getClipBounds(mTmpRect);
                if (includeChildInDismissAll(row, selection)) {
                    viewsToRemove.add(row);
                    if (child.getVisibility() == View.VISIBLE
                            && (!hasClipBounds || mTmpRect.height() > 0)) {
                        viewsToHide.add(child);
                        parentVisible = true;
                    }
                } else if (child.getVisibility() == View.VISIBLE
                        && (!hasClipBounds || mTmpRect.height() > 0)) {
                    parentVisible = true;
                }
                List<ExpandableNotificationRow> children = row.getNotificationChildren();
                if (children != null) {
                    for (ExpandableNotificationRow childRow : children) {
                        if (includeChildInDismissAll(row, selection)) {
                            viewsToRemove.add(childRow);
                            if (parentVisible && row.areChildrenExpanded()) {
                                hasClipBounds = childRow.getClipBounds(mTmpRect);
                                if (childRow.getVisibility() == View.VISIBLE
                                        && (!hasClipBounds || mTmpRect.height() > 0)) {
                                    viewsToHide.add(childRow);
                                }
                            }
                        }
                    }
                }
            }
        }

        // Log dismiss event even if there's nothing to dismiss
        mUiEventLogger.log(NotificationPanelEvent.fromSelection(selection));

        if (viewsToRemove.isEmpty()) {
            if (closeShade) {
                Dependency.get(ShadeController.class).animateCollapsePanels(
                        CommandQueue.FLAG_EXCLUDE_NONE);
            }
            return;
        }

        performDismissAllAnimations(
                viewsToHide,
                closeShade,
                () -> onDismissAllAnimationsEnd(viewsToRemove, selection));
    }

    private boolean includeChildInDismissAll(
            ExpandableNotificationRow row,
            @SelectedRows int selection) {
        return canChildBeDismissed(row) && matchesSelection(row, selection);
    }

    /**
     * Given a list of rows, animates them away in a staggered fashion as if they were dismissed.
     * Doesn't actually dismiss them, though -- that must be done in the onAnimationComplete
     * handler.
     *
     * @param hideAnimatedList List of rows to animated away. Should only be views that are
     *                         currently visible, or else the stagger will look funky.
     * @param closeShade Whether to close the shade after the stagger animation completes.
     * @param onAnimationComplete Called after the entire animation completes (including the shade
     *                            closing if appropriate). The rows must be dismissed for real here.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void performDismissAllAnimations(
            final ArrayList<View> hideAnimatedList,
            final boolean closeShade,
            final Runnable onAnimationComplete) {

        final Runnable onSlideAwayAnimationComplete = () -> {
            if (closeShade) {
                Dependency.get(ShadeController.class).addPostCollapseAction(() -> {
                    setDismissAllInProgress(false);
                    onAnimationComplete.run();
                });
                Dependency.get(ShadeController.class).animateCollapsePanels(
                        CommandQueue.FLAG_EXCLUDE_NONE);
            } else {
                setDismissAllInProgress(false);
                onAnimationComplete.run();
            }
        };

        if (hideAnimatedList.isEmpty()) {
            onSlideAwayAnimationComplete.run();
            return;
        }

        // let's disable our normal animations
        setDismissAllInProgress(true);

        // Decrease the delay for every row we animate to give the sense of
        // accelerating the swipes
        int rowDelayDecrement = 10;
        int currentDelay = 140;
        int totalDelay = 180;
        int numItems = hideAnimatedList.size();
        for (int i = numItems - 1; i >= 0; i--) {
            View view = hideAnimatedList.get(i);
            Runnable endRunnable = null;
            if (i == 0) {
                endRunnable = onSlideAwayAnimationComplete;
            }
            dismissViewAnimated(view, endRunnable, totalDelay, ANIMATION_DURATION_SWIPE);
            currentDelay = Math.max(50, currentDelay - rowDelayDecrement);
            totalDelay += currentDelay;
        }
    }

    @VisibleForTesting
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    protected void inflateFooterView() {
        FooterView footerView = (FooterView) LayoutInflater.from(mContext).inflate(
                R.layout.status_bar_notification_footer, this, false);
        footerView.setDismissButtonClickListener(v -> {
            mMetricsLogger.action(MetricsEvent.ACTION_DISMISS_ALL_NOTES);
            clearNotifications(ROWS_ALL, true /* closeShade */);
        });
        footerView.setManageButtonClickListener(this::manageNotifications);
        setFooterView(footerView);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private void inflateEmptyShadeView() {
        EmptyShadeView view = (EmptyShadeView) LayoutInflater.from(mContext).inflate(
                R.layout.status_bar_no_notifications, this, false);
        view.setText(R.string.empty_shade_text);
        setEmptyShadeView(view);
    }

    /**
     * Updates expanded, dimmed and locked states of notification rows.
     */
    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    public void onUpdateRowStates() {

        // The following views will be moved to the end of mStackScroller. This counter represents
        // the offset from the last child. Initialized to 1 for the very last position. It is post-
        // incremented in the following "changeViewPosition" calls so that its value is correct for
        // subsequent calls.
        int offsetFromEnd = 1;
        if (mFgsSectionView != null) {
            changeViewPosition(mFgsSectionView, getChildCount() - offsetFromEnd++);
        }
        changeViewPosition(mFooterView, getChildCount() - offsetFromEnd++);
        changeViewPosition(mEmptyShadeView, getChildCount() - offsetFromEnd++);

        // No post-increment for this call because it is the last one. Make sure to add one if
        // another "changeViewPosition" call is ever added.
        changeViewPosition(mShelf,
                getChildCount() - offsetFromEnd);
    }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void setNotificationPanelController(
            NotificationPanelViewController notificationPanelViewController) {
        mNotificationPanelController = notificationPanelViewController;
    }

    public void updateIconAreaViews() {
        mIconAreaController.updateNotificationIcons();
    }

    /**
     * Set how far the wake up is when waking up from pulsing. This is a height and will adjust the
     * notification positions accordingly.
     * @param height the new wake up height
     * @return the overflow how much the height is further than he lowest notification
     */
    public float setPulseHeight(float height) {
        mAmbientState.setPulseHeight(height);
        if (mKeyguardBypassController.getBypassEnabled()) {
            notifyAppearChangedListeners();
        }
        requestChildrenUpdate();
        return Math.max(0, height - mAmbientState.getInnerHeight(true /* ignorePulseHeight */));
    }

    public float getPulseHeight() {
        return mAmbientState.getPulseHeight();
    }

    /**
     * Set the amount how much we're dozing. This is different from how hidden the shade is, when
     * the notification is pulsing.
     */
    public void setDozeAmount(float dozeAmount) {
        mAmbientState.setDozeAmount(dozeAmount);
        updateContinuousBackgroundDrawing();
        requestChildrenUpdate();
    }

    public void wakeUpFromPulse() {
        setPulseHeight(getWakeUpHeight());
        // Let's place the hidden views at the end of the pulsing notification to make sure we have
        // a smooth animation
        boolean firstVisibleView = true;
        float wakeUplocation = -1f;
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            ExpandableView view = (ExpandableView) getChildAt(i);
            if (view.getVisibility() == View.GONE) {
                continue;
            }
            boolean isShelf = view == mShelf;
            if (!(view instanceof ExpandableNotificationRow) && !isShelf) {
                continue;
            }
            if (view.getVisibility() == View.VISIBLE && !isShelf) {
                if (firstVisibleView) {
                    firstVisibleView = false;
                    wakeUplocation = view.getTranslationY()
                            + view.getActualHeight() - mShelf.getIntrinsicHeight();
                }
            } else if (!firstVisibleView) {
                view.setTranslationY(wakeUplocation);
            }
        }
        mDimmedNeedsAnimation = true;
    }

    @Override
    public void onDynamicPrivacyChanged() {
        if (mIsExpanded) {
            // The bottom might change because we're using the final actual height of the view
            mAnimateBottomOnLayout = true;
        }
        // Let's update the footer once the notifications have been updated (in the next frame)
        post(() -> {
            updateFooter();
            updateSectionBoundaries();
        });
    }

    public void setOnPulseHeightChangedListener(Runnable listener) {
        mAmbientState.setOnPulseHeightChangedListener(listener);
    }

    public float calculateAppearFractionBypass() {
        float pulseHeight = getPulseHeight();
        float wakeUpHeight = getWakeUpHeight();
        float dragDownAmount = pulseHeight - wakeUpHeight;

        // The total distance required to fully reveal the header
        float totalDistance = getIntrinsicPadding();
        return MathUtils.smoothStep(0, totalDistance, dragDownAmount);
    }

    /**
     * A listener that is notified when the empty space below the notifications is clicked on
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public interface OnEmptySpaceClickListener {
        void onEmptySpaceClicked(float x, float y);
    }

    /**
     * A listener that gets notified when the overscroll at the top has changed.
     */
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public interface OnOverscrollTopChangedListener {

    /**
     * Notifies a listener that the overscroll has changed.
     *
     * @param amount         the amount of overscroll, in pixels
     * @param isRubberbanded if true, this is a rubberbanded overscroll; if false, this is an
     *                       unrubberbanded motion to directly expand overscroll view (e.g
     *                       expand
     *                       QS)
     */
    void onOverscrollTopChanged(float amount, boolean isRubberbanded);

    /**
     * Notify a listener that the scroller wants to escape from the scrolling motion and
     * start a fling animation to the expanded or collapsed overscroll view (e.g expand the QS)
     *
     * @param velocity The velocity that the Scroller had when over flinging
     * @param open     Should the fling open or close the overscroll view.
     */
    void flingTopOverscroll(float velocity, boolean open);
  }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void updateSpeedBumpIndex() {
        int speedBumpIndex = 0;
        int currentIndex = 0;
        final int N = getChildCount();
        for (int i = 0; i < N; i++) {
            View view = getChildAt(i);
            if (view.getVisibility() == View.GONE || !(view instanceof ExpandableNotificationRow)) {
                continue;
            }
            ExpandableNotificationRow row = (ExpandableNotificationRow) view;
            currentIndex++;
            boolean beforeSpeedBump;
            if (mHighPriorityBeforeSpeedBump) {
                beforeSpeedBump = row.getEntry().getBucket() < BUCKET_SILENT;
            } else {
                beforeSpeedBump = !row.getEntry().isAmbient();
            }
            if (beforeSpeedBump) {
                speedBumpIndex = currentIndex;
            }
        }
        boolean noAmbient = speedBumpIndex == N;
        updateSpeedBumpIndex(speedBumpIndex, noAmbient);
    }

    /** Updates the indices of the boundaries between sections. */
    @ShadeViewRefactor(RefactorComponent.INPUT)
    public void updateSectionBoundaries() {
        mSectionsManager.updateSectionBoundaries();
    }

    private void updateContinuousBackgroundDrawing() {
        boolean continuousBackground = !mAmbientState.isFullyAwake()
                && !mAmbientState.getDraggedViews().isEmpty();
        if (continuousBackground != mContinuousBackgroundUpdate) {
            mContinuousBackgroundUpdate = continuousBackground;
            if (continuousBackground) {
                getViewTreeObserver().addOnPreDrawListener(mBackgroundUpdater);
            } else {
                getViewTreeObserver().removeOnPreDrawListener(mBackgroundUpdater);
            }
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private void updateContinuousShadowDrawing() {
        boolean continuousShadowUpdate = mAnimationRunning
                || !mAmbientState.getDraggedViews().isEmpty();
        if (continuousShadowUpdate != mContinuousShadowUpdate) {
            if (continuousShadowUpdate) {
                getViewTreeObserver().addOnPreDrawListener(mShadowUpdater);
            } else {
                getViewTreeObserver().removeOnPreDrawListener(mShadowUpdater);
            }
            mContinuousShadowUpdate = continuousShadowUpdate;
        }
    }

    @Override
    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    public void resetExposedMenuView(boolean animate, boolean force) {
        mSwipeHelper.resetExposedMenuView(animate, force);
    }

    private static boolean matchesSelection(
            ExpandableNotificationRow row,
            @SelectedRows int selection) {
        switch (selection) {
            case ROWS_ALL:
                return true;
            case ROWS_HIGH_PRIORITY:
                return row.getEntry().getBucket() < BUCKET_SILENT;
            case ROWS_GENTLE:
                return row.getEntry().getBucket() == BUCKET_SILENT;
            default:
                throw new IllegalArgumentException("Unknown selection: " + selection);
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    static class AnimationEvent {

        static AnimationFilter[] FILTERS = new AnimationFilter[]{

                // ANIMATION_TYPE_ADD
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ()
                        .hasDelays(),

                // ANIMATION_TYPE_REMOVE
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ()
                        .hasDelays(),

                // ANIMATION_TYPE_REMOVE_SWIPED_OUT
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ()
                        .hasDelays(),

                // ANIMATION_TYPE_TOP_PADDING_CHANGED
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateDimmed()
                        .animateZ(),

                // ANIMATION_TYPE_ACTIVATED_CHILD
                new AnimationFilter()
                        .animateZ(),

                // ANIMATION_TYPE_DIMMED
                new AnimationFilter()
                        .animateDimmed(),

                // ANIMATION_TYPE_CHANGE_POSITION
                new AnimationFilter()
                        .animateAlpha() // maybe the children change positions
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ(),

                // ANIMATION_TYPE_GO_TO_FULL_SHADE
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateDimmed()
                        .animateZ()
                        .hasDelays(),

                // ANIMATION_TYPE_HIDE_SENSITIVE
                new AnimationFilter()
                        .animateHideSensitive(),

                // ANIMATION_TYPE_VIEW_RESIZE
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ(),

                // ANIMATION_TYPE_GROUP_EXPANSION_CHANGED
                new AnimationFilter()
                        .animateAlpha()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ(),

                // ANIMATION_TYPE_HEADS_UP_APPEAR
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ(),

                // ANIMATION_TYPE_HEADS_UP_DISAPPEAR
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ()
                        .hasDelays(),

                // ANIMATION_TYPE_HEADS_UP_DISAPPEAR_CLICK
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ()
                        .hasDelays(),

                // ANIMATION_TYPE_HEADS_UP_OTHER
                new AnimationFilter()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ(),

                // ANIMATION_TYPE_EVERYTHING
                new AnimationFilter()
                        .animateAlpha()
                        .animateDimmed()
                        .animateHideSensitive()
                        .animateHeight()
                        .animateTopInset()
                        .animateY()
                        .animateZ(),
        };

        static int[] LENGTHS = new int[]{

                // ANIMATION_TYPE_ADD
                StackStateAnimator.ANIMATION_DURATION_APPEAR_DISAPPEAR,

                // ANIMATION_TYPE_REMOVE
                StackStateAnimator.ANIMATION_DURATION_APPEAR_DISAPPEAR,

                // ANIMATION_TYPE_REMOVE_SWIPED_OUT
                StackStateAnimator.ANIMATION_DURATION_STANDARD,

                // ANIMATION_TYPE_TOP_PADDING_CHANGED
                StackStateAnimator.ANIMATION_DURATION_STANDARD,

                // ANIMATION_TYPE_ACTIVATED_CHILD
                StackStateAnimator.ANIMATION_DURATION_DIMMED_ACTIVATED,

                // ANIMATION_TYPE_DIMMED
                StackStateAnimator.ANIMATION_DURATION_DIMMED_ACTIVATED,

                // ANIMATION_TYPE_CHANGE_POSITION
                StackStateAnimator.ANIMATION_DURATION_STANDARD,

                // ANIMATION_TYPE_GO_TO_FULL_SHADE
                StackStateAnimator.ANIMATION_DURATION_GO_TO_FULL_SHADE,

                // ANIMATION_TYPE_HIDE_SENSITIVE
                StackStateAnimator.ANIMATION_DURATION_STANDARD,

                // ANIMATION_TYPE_VIEW_RESIZE
                StackStateAnimator.ANIMATION_DURATION_STANDARD,

                // ANIMATION_TYPE_GROUP_EXPANSION_CHANGED
                StackStateAnimator.ANIMATION_DURATION_STANDARD,

                // ANIMATION_TYPE_HEADS_UP_APPEAR
                StackStateAnimator.ANIMATION_DURATION_HEADS_UP_APPEAR,

                // ANIMATION_TYPE_HEADS_UP_DISAPPEAR
                StackStateAnimator.ANIMATION_DURATION_HEADS_UP_DISAPPEAR,

                // ANIMATION_TYPE_HEADS_UP_DISAPPEAR_CLICK
                StackStateAnimator.ANIMATION_DURATION_HEADS_UP_DISAPPEAR,

                // ANIMATION_TYPE_HEADS_UP_OTHER
                StackStateAnimator.ANIMATION_DURATION_STANDARD,

                // ANIMATION_TYPE_EVERYTHING
                StackStateAnimator.ANIMATION_DURATION_STANDARD,
        };

        static final int ANIMATION_TYPE_ADD = 0;
        static final int ANIMATION_TYPE_REMOVE = 1;
        static final int ANIMATION_TYPE_REMOVE_SWIPED_OUT = 2;
        static final int ANIMATION_TYPE_TOP_PADDING_CHANGED = 3;
        static final int ANIMATION_TYPE_ACTIVATED_CHILD = 4;
        static final int ANIMATION_TYPE_DIMMED = 5;
        static final int ANIMATION_TYPE_CHANGE_POSITION = 6;
        static final int ANIMATION_TYPE_GO_TO_FULL_SHADE = 7;
        static final int ANIMATION_TYPE_HIDE_SENSITIVE = 8;
        static final int ANIMATION_TYPE_VIEW_RESIZE = 9;
        static final int ANIMATION_TYPE_GROUP_EXPANSION_CHANGED = 10;
        static final int ANIMATION_TYPE_HEADS_UP_APPEAR = 11;
        static final int ANIMATION_TYPE_HEADS_UP_DISAPPEAR = 12;
        static final int ANIMATION_TYPE_HEADS_UP_DISAPPEAR_CLICK = 13;
        static final int ANIMATION_TYPE_HEADS_UP_OTHER = 14;
        static final int ANIMATION_TYPE_EVERYTHING = 15;

        final long eventStartTime;
        final ExpandableView mChangingView;
        final int animationType;
        final AnimationFilter filter;
        final long length;
        View viewAfterChangingView;
        boolean headsUpFromBottom;

        AnimationEvent(ExpandableView view, int type) {
            this(view, type, LENGTHS[type]);
        }

        AnimationEvent(ExpandableView view, int type, AnimationFilter filter) {
            this(view, type, LENGTHS[type], filter);
        }

        AnimationEvent(ExpandableView view, int type, long length) {
            this(view, type, length, FILTERS[type]);
        }

        AnimationEvent(ExpandableView view, int type, long length, AnimationFilter filter) {
            eventStartTime = AnimationUtils.currentAnimationTimeMillis();
            mChangingView = view;
            animationType = type;
            this.length = length;
            this.filter = filter;
        }

        /**
         * Combines the length of several animation events into a single value.
         *
         * @param events The events of the lengths to combine.
         * @return The combined length. Depending on the event types, this might be the maximum of
         * all events or the length of a specific event.
         */
        static long combineLength(ArrayList<AnimationEvent> events) {
            long length = 0;
            int size = events.size();
            for (int i = 0; i < size; i++) {
                AnimationEvent event = events.get(i);
                length = Math.max(length, event.length);
                if (event.animationType == ANIMATION_TYPE_GO_TO_FULL_SHADE) {
                    return event.length;
                }
            }
            return length;
        }
    }

    @ShadeViewRefactor(RefactorComponent.STATE_RESOLVER)
    private final StateListener mStateListener = new StateListener() {
        @Override
        public void onStatePreChange(int oldState, int newState) {
            if (oldState == StatusBarState.SHADE_LOCKED && newState == StatusBarState.KEYGUARD) {
                requestAnimateEverything();
            }
        }

        @Override
        public void onStateChanged(int newState) {
            setStatusBarState(newState);
        }

        @Override
        public void onStatePostChange() {
          NotificationStackScrollLayout.this.onStatePostChange();
      }
    };

    @VisibleForTesting
    @ShadeViewRefactor(RefactorComponent.INPUT)
    protected final OnMenuEventListener mMenuEventListener = new OnMenuEventListener() {
        @Override
        public void onMenuClicked(View view, int x, int y, MenuItem item) {
            if (mLongPressListener == null) {
                return;
            }
            if (view instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) view;
                mMetricsLogger.write(row.getEntry().getSbn().getLogMaker()
                        .setCategory(MetricsEvent.ACTION_TOUCH_GEAR)
                        .setType(MetricsEvent.TYPE_ACTION)
                        );
            }
            mLongPressListener.onLongPress(view, x, y, item);
        }

        @Override
        public void onMenuReset(View row) {
            View translatingParentView = mSwipeHelper.getTranslatingParentView();
            if (translatingParentView != null && row == translatingParentView) {
                mSwipeHelper.clearExposedMenuView();
                mSwipeHelper.clearTranslatingParentView();
                if (row instanceof ExpandableNotificationRow) {
                    mHeadsUpManager.setMenuShown(
                            ((ExpandableNotificationRow) row).getEntry(), false);

                }
            }
        }

        @Override
        public void onMenuShown(View row) {
            if (row instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow notificationRow = (ExpandableNotificationRow) row;
                mMetricsLogger.write(notificationRow.getEntry().getSbn().getLogMaker()
                        .setCategory(MetricsEvent.ACTION_REVEAL_GEAR)
                        .setType(MetricsEvent.TYPE_ACTION));
                mHeadsUpManager.setMenuShown(notificationRow.getEntry(), true);
                mSwipeHelper.onMenuShown(row);
                mNotificationGutsManager.closeAndSaveGuts(true /* removeLeavebehind */,
                        false /* force */, false /* removeControls */, -1 /* x */, -1 /* y */,
                        false /* resetMenu */);

                // Check to see if we want to go directly to the notfication guts
                NotificationMenuRowPlugin provider = notificationRow.getProvider();
                if (provider.shouldShowGutsOnSnapOpen()) {
                    MenuItem item = provider.menuItemToExposeOnSnap();
                    if (item != null) {
                        Point origin = provider.getRevealAnimationOrigin();
                        mNotificationGutsManager.openGuts(row, origin.x, origin.y, item);
                    } else  {
                        Log.e(TAG, "Provider has shouldShowGutsOnSnapOpen, but provided no "
                                + "menu item in menuItemtoExposeOnSnap. Skipping.");
                    }

                    // Close the menu row since we went directly to the guts
                    resetExposedMenuView(false, true);
                }
            }
        }
    };

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private final NotificationSwipeHelper.NotificationCallback mNotificationCallback =
            new NotificationSwipeHelper.NotificationCallback() {
        @Override
        public void onDismiss() {
            mNotificationGutsManager.closeAndSaveGuts(true /* removeLeavebehind */,
                    false /* force */, false /* removeControls */, -1 /* x */, -1 /* y */,
                    false /* resetMenu */);
        }

        @Override
        public void onSnooze(StatusBarNotification sbn,
                NotificationSwipeActionHelper.SnoozeOption snoozeOption) {
            mStatusBar.setNotificationSnoozed(sbn, snoozeOption);
        }

        @Override
        public void onSnooze(StatusBarNotification sbn, int hours) {
            mStatusBar.setNotificationSnoozed(sbn, hours);
        }

        @Override
        public boolean shouldDismissQuickly() {
            return NotificationStackScrollLayout.this.isExpanded() && mAmbientState.isFullyAwake();
        }

        @Override
        public void onDragCancelled(View v) {
            setSwipingInProgress(false);
            mFalsingManager.onNotificatonStopDismissing();
        }

        /**
         * Handles cleanup after the given {@code view} has been fully swiped out (including
         * re-invoking dismiss logic in case the notification has not made its way out yet).
         */
        @Override
        public void onChildDismissed(View view) {
            if (!(view instanceof ActivatableNotificationView)) {
                return;
            }
            ActivatableNotificationView row = (ActivatableNotificationView) view;
            if (!row.isDismissed()) {
                handleChildViewDismissed(view);
            }
            ViewGroup transientContainer = row.getTransientContainer();
            if (transientContainer != null) {
                transientContainer.removeTransientView(view);
            }
        }

        /**
         * Starts up notification dismiss and tells the notification, if any, to remove itself from
         * layout.
         *
         * @param view view (e.g. notification) to dismiss from the layout
         */

        public void handleChildViewDismissed(View view) {
            setSwipingInProgress(false);
            if (mDismissAllInProgress) {
                return;
            }

            boolean isBlockingHelperShown = false;

            mAmbientState.onDragFinished(view);
            updateContinuousShadowDrawing();

            if (view instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) view;
                if (row.isHeadsUp()) {
                    mHeadsUpManager.addSwipedOutNotification(
                            row.getEntry().getSbn().getKey());
                }
                isBlockingHelperShown =
                        row.performDismissWithBlockingHelper(false /* fromAccessibility */);
            }

            if (view instanceof PeopleHubView) {
                mSectionsManager.hidePeopleRow();
            }

            if (!isBlockingHelperShown) {
                mSwipedOutViews.add(view);
            }
            mFalsingManager.onNotificationDismissed();
            if (mFalsingManager.shouldEnforceBouncer()) {
                mStatusBar.executeRunnableDismissingKeyguard(
                        null,
                        null /* cancelAction */,
                        false /* dismissShade */,
                        true /* afterKeyguardGone */,
                        false /* deferred */);
            }
        }

        @Override
        public boolean isAntiFalsingNeeded() {
            return onKeyguard();
        }

        @Override
        public View getChildAtPosition(MotionEvent ev) {
            View child = NotificationStackScrollLayout.this.getChildAtPosition(
                    ev.getX(),
                    ev.getY(),
                    true /* requireMinHeight */,
                    false /* ignoreDecors */);
            if (child instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) child;
                ExpandableNotificationRow parent = row.getNotificationParent();
                if (parent != null && parent.areChildrenExpanded()
                        && (parent.areGutsExposed()
                        || mSwipeHelper.getExposedMenuView() == parent
                        || (parent.getNotificationChildren().size() == 1
                        && parent.getEntry().isClearable()))) {
                    // In this case the group is expanded and showing the menu for the
                    // group, further interaction should apply to the group, not any
                    // child notifications so we use the parent of the child. We also do the same
                    // if we only have a single child.
                    child = parent;
                }
            }
            return child;
        }

        @Override
        public void onBeginDrag(View v) {
            mFalsingManager.onNotificatonStartDismissing();
            setSwipingInProgress(true);
            mAmbientState.onBeginDrag((ExpandableView) v);
            updateContinuousShadowDrawing();
            updateContinuousBackgroundDrawing();
            requestChildrenUpdate();
        }

        @Override
        public void onChildSnappedBack(View animView, float targetLeft) {
            mAmbientState.onDragFinished(animView);
            updateContinuousShadowDrawing();
            updateContinuousBackgroundDrawing();
            if (animView instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) animView;
                if (row.isPinned() && !canChildBeDismissed(row)
                        && row.getEntry().getSbn().getNotification().fullScreenIntent
                                == null) {
                    mHeadsUpManager.removeNotification(row.getEntry().getSbn().getKey(),
                            true /* removeImmediately */);
                }
            }
        }

        @Override
        public boolean updateSwipeProgress(View animView, boolean dismissable,
                float swipeProgress) {
            // Returning true prevents alpha fading.
            return !mFadeNotificationsOnDismiss;
        }

        @Override
        public float getFalsingThresholdFactor() {
            return mStatusBar.isWakeUpComingFromTouch() ? 1.5f : 1.0f;
        }

        @Override
        public int getConstrainSwipeStartPosition() {
            NotificationMenuRowPlugin menuRow = mSwipeHelper.getCurrentMenuRow();
            if (menuRow != null) {
                return Math.abs(menuRow.getMenuSnapTarget());
            }
            return 0;
        }

        @Override
        public boolean canChildBeDismissed(View v) {
            return NotificationStackScrollLayout.canChildBeDismissed(v);
        }

        @Override
        public boolean canChildBeDismissedInDirection(View v, boolean isRightOrDown) {
            //TODO: b/131242807 for why this doesn't do anything with direction
            return canChildBeDismissed(v);
        }
    };

    private static boolean canChildBeDismissed(View v) {
        if (v instanceof ExpandableNotificationRow) {
            ExpandableNotificationRow row = (ExpandableNotificationRow) v;
            if (row.isBlockingHelperShowingAndTranslationFinished()) {
                return true;
            }
            if (row.areGutsExposed() || !row.getEntry().hasFinishedInitialization()) {
                return false;
            }
            return row.canViewBeDismissed();
        }
        if (v instanceof PeopleHubView) {
            return true;
        }
        return false;
    }

    // --------------------- NotificationEntryManager/NotifPipeline methods ------------------------

    private void onEntryUpdated(NotificationEntry entry) {
        // If the row already exists, the user may have performed a dismiss action on the
        // notification. Since it's not clearable we should snap it back.
        if (entry.rowExists() && !entry.getSbn().isClearable()) {
            snapViewIfNeeded(entry);
        }
    }

    private boolean hasActiveNotifications() {
        if (mFeatureFlags.isNewNotifPipelineRenderingEnabled()) {
            return !mNotifPipeline.getShadeList().isEmpty();
        } else {
            return mEntryManager.hasActiveNotifications();
        }
    }

    /**
     * Called after the animations for a "clear all notifications" action has ended.
     */
    private void onDismissAllAnimationsEnd(
            List<ExpandableNotificationRow> viewsToRemove,
            @SelectedRows int selectedRows) {
        if (mFeatureFlags.isNewNotifPipelineRenderingEnabled()) {
            if (selectedRows == ROWS_ALL) {
                mNotifCollection.dismissAllNotifications(mLockscreenUserManager.getCurrentUserId());
            } else {
                final List<Pair<NotificationEntry, DismissedByUserStats>>
                        entriesWithRowsDismissedFromShade = new ArrayList<>();
                final List<DismissedByUserStats> dismissalUserStats = new ArrayList<>();
                final int numVisibleEntries = mNotifPipeline.getShadeListCount();
                for (int i = 0; i < viewsToRemove.size(); i++) {
                    final NotificationEntry entry = viewsToRemove.get(i).getEntry();
                    final DismissedByUserStats stats =
                            new DismissedByUserStats(
                                    DISMISSAL_SHADE,
                                    DISMISS_SENTIMENT_NEUTRAL,
                                    NotificationVisibility.obtain(
                                            entry.getKey(),
                                            entry.getRanking().getRank(),
                                            numVisibleEntries,
                                            true,
                                            NotificationLogger.getNotificationLocation(entry)));
                    entriesWithRowsDismissedFromShade.add(
                            new Pair<NotificationEntry, DismissedByUserStats>(entry, stats));
                }
                mNotifCollection.dismissNotifications(entriesWithRowsDismissedFromShade);
            }
        } else {
            for (ExpandableNotificationRow rowToRemove : viewsToRemove) {
                if (canChildBeDismissed(rowToRemove)) {
                    if (selectedRows == ROWS_ALL) {
                        // TODO: This is a listener method; we shouldn't be calling it. Can we just
                        // call performRemoveNotification as below?
                        mEntryManager.removeNotification(
                                rowToRemove.getEntry().getKey(),
                                null /* ranking */,
                                NotificationListenerService.REASON_CANCEL_ALL);
                    } else {
                        mEntryManager.performRemoveNotification(
                                rowToRemove.getEntry().getSbn(),
                                NotificationListenerService.REASON_CANCEL_ALL);
                    }
                } else {
                    rowToRemove.resetTranslation();
                }
            }
            if (selectedRows == ROWS_ALL) {
                try {
                    mBarService.onClearAllNotifications(mLockscreenUserManager.getCurrentUserId());
                } catch (Exception ex) {
                }
            }
        }
    }

    // ---------------------- DragDownHelper.OnDragDownListener ------------------------------------

    @ShadeViewRefactor(RefactorComponent.INPUT)
    private final DragDownCallback mDragDownCallback = new DragDownCallback() {

        /* Only ever called as a consequence of a lockscreen expansion gesture. */
        @Override
        public boolean onDraggedDown(View startingChild, int dragLengthY) {
            if (mStatusBarState == StatusBarState.KEYGUARD && hasActiveNotifications()) {
                mLockscreenGestureLogger.write(
                        MetricsEvent.ACTION_LS_SHADE,
                        (int) (dragLengthY / mDisplayMetrics.density),
                        0 /* velocityDp - N/A */);

                if (!mAmbientState.isDozing() || startingChild != null) {
                    // We have notifications, go to locked shade.
                    Dependency.get(ShadeController.class).goToLockedShade(startingChild);
                    if (startingChild instanceof ExpandableNotificationRow) {
                        ExpandableNotificationRow row = (ExpandableNotificationRow) startingChild;
                        row.onExpandedByGesture(true /* drag down is always an open */);
                    }
                }

                return true;
            } else if (mDynamicPrivacyController.isInLockedDownShade()) {
                mStatusbarStateController.setLeaveOpenOnKeyguardHide(true);
                mStatusBar.dismissKeyguardThenExecute(() -> false /* dismissAction */,
                        null /* cancelRunnable */, false /* afterKeyguardGone */);
                return true;
            } else {
                // abort gesture.
                return false;
            }
        }

        @Override
        public void onDragDownReset() {
            setDimmed(true /* dimmed */, true /* animated */);
            resetScrollPosition();
            resetCheckSnoozeLeavebehind();
        }

        @Override
        public void onCrossedThreshold(boolean above) {
            setDimmed(!above /* dimmed */, true /* animate */);
        }

        @Override
        public void onTouchSlopExceeded() {
            cancelLongPress();
            checkSnoozeLeavebehind();
        }

        @Override
        public void setEmptyDragAmount(float amount) {
            mNotificationPanelController.setEmptyDragAmount(amount);
        }

        @Override
        public boolean isFalsingCheckNeeded() {
            return mStatusBarState == StatusBarState.KEYGUARD;
        }

        @Override
        public boolean isDragDownEnabledForView(ExpandableView view) {
            if (isDragDownAnywhereEnabled()) {
                return true;
            }
            if (mDynamicPrivacyController.isInLockedDownShade()) {
                if (view == null) {
                    // Dragging down is allowed in general
                    return true;
                }
                if (view instanceof ExpandableNotificationRow) {
                    // Only drag down on sensitive views, otherwise the ExpandHelper will take this
                    return ((ExpandableNotificationRow) view).getEntry().isSensitive();
                }
            }
            return false;
        }

        @Override
        public boolean isDragDownAnywhereEnabled() {
            return mStatusbarStateController.getState() == StatusBarState.KEYGUARD
                    && !mKeyguardBypassController.getBypassEnabled();
        }
    };

    public DragDownCallback getDragDownCallback() { return mDragDownCallback; }

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private final HeadsUpTouchHelper.Callback mHeadsUpCallback = new HeadsUpTouchHelper.Callback() {
        @Override
        public ExpandableView getChildAtRawPosition(float touchX, float touchY) {
            return NotificationStackScrollLayout.this.getChildAtRawPosition(touchX, touchY);
        }

        @Override
        public boolean isExpanded() {
            return mIsExpanded;
        }

        @Override
        public Context getContext() {
            return mContext;
        }
    };

    public HeadsUpTouchHelper.Callback getHeadsUpCallback() { return mHeadsUpCallback; }


    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private final OnGroupChangeListener mOnGroupChangeListener = new OnGroupChangeListener() {
        @Override
        public void onGroupExpansionChanged(ExpandableNotificationRow changedRow, boolean expanded) {
            boolean animated = !mGroupExpandedForMeasure && mAnimationsEnabled
                    && (mIsExpanded || changedRow.isPinned());
            if (animated) {
                mExpandedGroupView = changedRow;
                mNeedsAnimation = true;
            }
            changedRow.setChildrenExpanded(expanded, animated);
            if (!mGroupExpandedForMeasure) {
                onHeightChanged(changedRow, false /* needsAnimation */);
            }
            runAfterAnimationFinished(new Runnable() {
                @Override
                public void run() {
                    changedRow.onFinishedExpansionChange();
                }
            });
        }

        @Override
        public void onGroupCreatedFromChildren(NotificationGroupManager.NotificationGroup group) {
            mStatusBar.requestNotificationUpdate("onGroupCreatedFromChildren");
        }

        @Override
        public void onGroupsChanged() {
            mStatusBar.requestNotificationUpdate("onGroupsChanged");
        }
    };

    @ShadeViewRefactor(RefactorComponent.SHADE_VIEW)
    private ExpandHelper.Callback mExpandHelperCallback = new ExpandHelper.Callback() {
        @Override
        public ExpandableView getChildAtPosition(float touchX, float touchY) {
            return NotificationStackScrollLayout.this.getChildAtPosition(touchX, touchY);
        }

        @Override
        public ExpandableView getChildAtRawPosition(float touchX, float touchY) {
            return NotificationStackScrollLayout.this.getChildAtRawPosition(touchX, touchY);
        }

        @Override
        public boolean canChildBeExpanded(View v) {
            return v instanceof ExpandableNotificationRow
                    && ((ExpandableNotificationRow) v).isExpandable()
                    && !((ExpandableNotificationRow) v).areGutsExposed()
                    && (mIsExpanded || !((ExpandableNotificationRow) v).isPinned());
        }

        /* Only ever called as a consequence of an expansion gesture in the shade. */
        @Override
        public void setUserExpandedChild(View v, boolean userExpanded) {
            if (v instanceof ExpandableNotificationRow) {
                ExpandableNotificationRow row = (ExpandableNotificationRow) v;
                if (userExpanded && onKeyguard()) {
                    // Due to a race when locking the screen while touching, a notification may be
                    // expanded even after we went back to keyguard. An example of this happens if
                    // you click in the empty space while expanding a group.

                    // We also need to un-user lock it here, since otherwise the content height
                    // calculated might be wrong. We also can't invert the two calls since
                    // un-userlocking it will trigger a layout switch in the content view.
                    row.setUserLocked(false);
                    updateContentHeight();
                    notifyHeightChangeListener(row);
                    return;
                }
                row.setUserExpanded(userExpanded, true /* allowChildrenExpansion */);
                row.onExpandedByGesture(userExpanded);
            }
        }

        @Override
        public void setExpansionCancelled(View v) {
            if (v instanceof ExpandableNotificationRow) {
                ((ExpandableNotificationRow) v).setGroupExpansionChanging(false);
            }
        }

        @Override
        public void setUserLockedChild(View v, boolean userLocked) {
            if (v instanceof ExpandableNotificationRow) {
                ((ExpandableNotificationRow) v).setUserLocked(userLocked);
            }
            cancelLongPress();
            requestDisallowInterceptTouchEvent(true);
        }

        @Override
        public void expansionStateChanged(boolean isExpanding) {
            mExpandingNotification = isExpanding;
            if (!mExpandedInThisMotion) {
                if (ANCHOR_SCROLLING) {
                    // TODO
                } else {
                    mMaxScrollAfterExpand = mOwnScrollY;
                }
                mExpandedInThisMotion = true;
            }
        }

        @Override
        public int getMaxExpandHeight(ExpandableView view) {
            return view.getMaxContentHeight();
        }
    };

    public ExpandHelper.Callback getExpandHelperCallback() {
        return mExpandHelperCallback;
    }

    /** Enum for selecting some or all notification rows (does not included non-notif views). */
    @Retention(SOURCE)
    @IntDef({ROWS_ALL, ROWS_HIGH_PRIORITY, ROWS_GENTLE})
    public @interface SelectedRows {}
    /** All rows representing notifs. */
    public static final int ROWS_ALL = 0;
    /** Only rows where entry.isHighPriority() is true. */
    public static final int ROWS_HIGH_PRIORITY = 1;
    /** Only rows where entry.isHighPriority() is false. */
    public static final int ROWS_GENTLE = 2;

    /**
     * Enum for UiEvent logged from this class
     */
    enum NotificationPanelEvent implements UiEventLogger.UiEventEnum {
        INVALID(0),
        @UiEvent(doc = "User dismissed all notifications from notification panel.")
        DISMISS_ALL_NOTIFICATIONS_PANEL(312),
        @UiEvent(doc = "User dismissed all silent notifications from notification panel.")
        DISMISS_SILENT_NOTIFICATIONS_PANEL(314);
        private final int mId;
        NotificationPanelEvent(int id) {
            mId = id;
        }
        @Override public int getId() {
            return mId;
        }

        public static UiEventLogger.UiEventEnum fromSelection(@SelectedRows int selection) {
            if (selection == ROWS_ALL) {
                return DISMISS_ALL_NOTIFICATIONS_PANEL;
            }
            if (selection == ROWS_GENTLE) {
                return DISMISS_SILENT_NOTIFICATIONS_PANEL;
            }
            if (NotificationStackScrollLayout.DEBUG) {
                throw new IllegalArgumentException("Unexpected selection" + selection);
            }
            return INVALID;
        }
    }
}