/*
 * Copyright (C) 2012 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.phone;

import static com.android.systemui.statusbar.notification.ActivityLaunchAnimator.ExpandAnimationParameters;
import static com.android.systemui.statusbar.notification.stack.NotificationStackScrollLayout.ROWS_ALL;
import static com.android.systemui.util.InjectionInflationController.VIEW_CONTEXT;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.app.ActivityManager;
import android.app.Fragment;
import android.app.StatusBarManager;
import android.content.Context;
import android.content.pm.ResolveInfo;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PointF;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.Region;
import android.hardware.biometrics.BiometricSourceType;
import android.os.PowerManager;
import android.os.SystemClock;
import android.provider.DeviceConfig;
import android.provider.Settings;
import android.util.AttributeSet;
import android.util.Log;
import android.util.MathUtils;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowInsets;
import android.view.accessibility.AccessibilityManager;
import android.widget.FrameLayout;

import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.config.sysui.SystemUiDeviceConfigFlags;
import com.android.internal.logging.MetricsLogger;
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.keyguard.KeyguardClockSwitch;
import com.android.keyguard.KeyguardStatusView;
import com.android.keyguard.KeyguardUpdateMonitor;
import com.android.keyguard.KeyguardUpdateMonitorCallback;
import com.android.systemui.DejankUtils;
import com.android.systemui.Dependency;
import com.android.systemui.Interpolators;
import com.android.systemui.R;
import com.android.systemui.doze.DozeLog;
import com.android.systemui.fragments.FragmentHostManager;
import com.android.systemui.fragments.FragmentHostManager.FragmentListener;
import com.android.systemui.plugins.FalsingManager;
import com.android.systemui.plugins.HomeControlsPlugin;
import com.android.systemui.plugins.PluginListener;
import com.android.systemui.plugins.qs.QS;
import com.android.systemui.plugins.statusbar.StatusBarStateController;
import com.android.systemui.plugins.statusbar.StatusBarStateController.StateListener;
import com.android.systemui.qs.QSFragment;
import com.android.systemui.shared.plugins.PluginManager;
import com.android.systemui.statusbar.CommandQueue;
import com.android.systemui.statusbar.FlingAnimationUtils;
import com.android.systemui.statusbar.GestureRecorder;
import com.android.systemui.statusbar.KeyguardAffordanceView;
import com.android.systemui.statusbar.KeyguardIndicationController;
import com.android.systemui.statusbar.NotificationLockscreenUserManager;
import com.android.systemui.statusbar.NotificationShelf;
import com.android.systemui.statusbar.PulseExpansionHandler;
import com.android.systemui.statusbar.RemoteInputController;
import com.android.systemui.statusbar.StatusBarState;
import com.android.systemui.statusbar.SysuiStatusBarStateController;
import com.android.systemui.statusbar.notification.ActivityLaunchAnimator;
import com.android.systemui.statusbar.notification.AnimatableProperty;
import com.android.systemui.statusbar.notification.DynamicPrivacyController;
import com.android.systemui.statusbar.notification.NotificationEntryManager;
import com.android.systemui.statusbar.notification.NotificationWakeUpCoordinator;
import com.android.systemui.statusbar.notification.PropertyAnimator;
import com.android.systemui.statusbar.notification.collection.NotificationEntry;
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.stack.AnimationProperties;
import com.android.systemui.statusbar.notification.stack.NotificationStackScrollLayout;
import com.android.systemui.statusbar.notification.stack.StackStateAnimator;
import com.android.systemui.statusbar.policy.ConfigurationController;
import com.android.systemui.statusbar.policy.KeyguardStateController;
import com.android.systemui.statusbar.policy.KeyguardUserSwitcher;
import com.android.systemui.statusbar.policy.OnHeadsUpChangedListener;
import com.android.systemui.statusbar.policy.ZenModeController;
import com.android.systemui.util.InjectionInflationController;
import com.android.systemui.util.Utils;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.Consumer;

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

public class NotificationPanelView extends PanelView implements
        ExpandableView.OnHeightChangedListener,
        View.OnClickListener, NotificationStackScrollLayout.OnOverscrollTopChangedListener,
        KeyguardAffordanceHelper.Callback, NotificationStackScrollLayout.OnEmptySpaceClickListener,
        OnHeadsUpChangedListener, QS.HeightListener, ZenModeController.Callback,
        ConfigurationController.ConfigurationListener, StateListener,
        PulseExpansionHandler.ExpansionCallback, DynamicPrivacyController.Listener,
        NotificationWakeUpCoordinator.WakeUpListener {

    private static final boolean DEBUG = false;

    /**
     * Fling expanding QS.
     */
    public static final int FLING_EXPAND = 0;

    /**
     * Fling collapsing QS, potentially stopping when QS becomes QQS.
     */
    public static final int FLING_COLLAPSE = 1;

    /**
     * Fling until QS is completely hidden.
     */
    public static final int FLING_HIDE = 2;
    private final DozeParameters mDozeParameters;

    private double mQqsSplitFraction;

    // Cap and total height of Roboto font. Needs to be adjusted when font for the big clock is
    // changed.
    private static final int CAP_HEIGHT = 1456;
    private static final int FONT_HEIGHT = 2163;

    /**
     * Maximum time before which we will expand the panel even for slow motions when getting a
     * touch passed over from launcher.
     */
    private static final int MAX_TIME_TO_OPEN_WHEN_FLINGING_FROM_LAUNCHER = 300;

    static final String COUNTER_PANEL_OPEN = "panel_open";
    static final String COUNTER_PANEL_OPEN_QS = "panel_open_qs";
    private static final String COUNTER_PANEL_OPEN_PEEK = "panel_open_peek";

    private static final Rect mDummyDirtyRect = new Rect(0, 0, 1, 1);
    private static final Rect mEmptyRect = new Rect();

    private static final AnimationProperties CLOCK_ANIMATION_PROPERTIES = new AnimationProperties()
            .setDuration(StackStateAnimator.ANIMATION_DURATION_STANDARD);
    private static final AnimatableProperty KEYGUARD_HEADS_UP_SHOWING_AMOUNT
            = AnimatableProperty.from("KEYGUARD_HEADS_UP_SHOWING_AMOUNT",
            NotificationPanelView::setKeyguardHeadsUpShowingAmount,
            NotificationPanelView::getKeyguardHeadsUpShowingAmount,
            R.id.keyguard_hun_animator_tag,
            R.id.keyguard_hun_animator_end_tag,
            R.id.keyguard_hun_animator_start_tag);
    private static final AnimationProperties KEYGUARD_HUN_PROPERTIES =
            new AnimationProperties().setDuration(StackStateAnimator.ANIMATION_DURATION_STANDARD);
    @VisibleForTesting
    final KeyguardUpdateMonitorCallback mKeyguardUpdateCallback =
            new KeyguardUpdateMonitorCallback() {

                @Override
                public void onBiometricAuthenticated(int userId,
                        BiometricSourceType biometricSourceType) {
                    if (mFirstBypassAttempt && mUpdateMonitor.isUnlockingWithBiometricAllowed()) {
                        mDelayShowingKeyguardStatusBar = true;
                    }
                }

                @Override
                public void onBiometricRunningStateChanged(boolean running,
                        BiometricSourceType biometricSourceType) {
                    boolean keyguardOrShadeLocked = mBarState == StatusBarState.KEYGUARD
                            || mBarState == StatusBarState.SHADE_LOCKED;
                    if (!running && mFirstBypassAttempt && keyguardOrShadeLocked && !mDozing
                            && !mDelayShowingKeyguardStatusBar) {
                        mFirstBypassAttempt = false;
                        animateKeyguardStatusBarIn(StackStateAnimator.ANIMATION_DURATION_STANDARD);
                    }
                }

                @Override
                public void onFinishedGoingToSleep(int why) {
                    mFirstBypassAttempt = mKeyguardBypassController.getBypassEnabled();
                    mDelayShowingKeyguardStatusBar = false;
                }
            };
    private final KeyguardStateController.Callback mKeyguardMonitorCallback =
            new KeyguardStateController.Callback() {
                @Override
                public void onKeyguardFadingAwayChanged() {
                    if (!mKeyguardStateController.isKeyguardFadingAway()) {
                        mFirstBypassAttempt = false;
                        mDelayShowingKeyguardStatusBar = false;
                    }
                }
            };

    private final InjectionInflationController mInjectionInflationController;
    private final PowerManager mPowerManager;
    private final AccessibilityManager mAccessibilityManager;
    private final NotificationWakeUpCoordinator mWakeUpCoordinator;
    private final PulseExpansionHandler mPulseExpansionHandler;
    private final KeyguardBypassController mKeyguardBypassController;
    private final KeyguardUpdateMonitor mUpdateMonitor;

    @VisibleForTesting
    protected KeyguardAffordanceHelper mAffordanceHelper;
    private KeyguardUserSwitcher mKeyguardUserSwitcher;
    @VisibleForTesting
    protected KeyguardStatusBarView mKeyguardStatusBar;
    @VisibleForTesting
    protected ViewGroup mBigClockContainer;
    private QS mQs;
    @VisibleForTesting
    protected FrameLayout mQsFrame;
    @VisibleForTesting
    protected KeyguardStatusView mKeyguardStatusView;
    private View mQsNavbarScrim;
    protected NotificationsQuickSettingsContainer mNotificationContainerParent;
    protected NotificationStackScrollLayout mNotificationStackScroller;
    protected FrameLayout mHomeControlsLayout;
    private boolean mAnimateNextPositionUpdate;

    private int mTrackingPointer;
    private VelocityTracker mQsVelocityTracker;
    private boolean mQsTracking;

    /**
     * If set, the ongoing touch gesture might both trigger the expansion in {@link PanelView} and
     * the expansion for quick settings.
     */
    private boolean mConflictingQsExpansionGesture;

    /**
     * Whether we are currently handling a motion gesture in #onInterceptTouchEvent, but haven't
     * intercepted yet.
     */
    private boolean mIntercepting;
    private boolean mPanelExpanded;
    private boolean mQsExpanded;
    private boolean mQsExpandedWhenExpandingStarted;
    private boolean mQsFullyExpanded;
    private boolean mKeyguardShowing;
    private boolean mDozing;
    private boolean mDozingOnDown;
    protected int mBarState;
    private float mInitialHeightOnTouch;
    private float mInitialTouchX;
    private float mInitialTouchY;
    private float mLastTouchX;
    private float mLastTouchY;
    protected float mQsExpansionHeight;
    protected int mQsMinExpansionHeight;
    protected int mQsMaxExpansionHeight;
    private int mQsPeekHeight;
    private boolean mStackScrollerOverscrolling;
    private boolean mQsExpansionFromOverscroll;
    private float mLastOverscroll;
    protected boolean mQsExpansionEnabled = true;
    private ValueAnimator mQsExpansionAnimator;
    private FlingAnimationUtils mFlingAnimationUtils;
    private int mStatusBarMinHeight;
    private int mNotificationsHeaderCollideDistance;
    private int mUnlockMoveDistance;
    private float mEmptyDragAmount;
    private float mDownX;
    private float mDownY;

    private final KeyguardClockPositionAlgorithm mClockPositionAlgorithm =
            new KeyguardClockPositionAlgorithm();
    private final KeyguardClockPositionAlgorithm.Result mClockPositionResult =
            new KeyguardClockPositionAlgorithm.Result();
    private boolean mIsExpanding;

    private boolean mBlockTouches;
    // Used for two finger gesture as well as accessibility shortcut to QS.
    private boolean mQsExpandImmediate;
    private boolean mTwoFingerQsExpandPossible;

    /**
     * If we are in a panel collapsing motion, we reset scrollY of our scroll view but still
     * need to take this into account in our panel height calculation.
     */
    private boolean mQsAnimatorExpand;
    private boolean mIsLaunchTransitionFinished;
    private boolean mIsLaunchTransitionRunning;
    private Runnable mLaunchAnimationEndRunnable;
    private boolean mOnlyAffordanceInThisMotion;
    private boolean mKeyguardStatusViewAnimating;
    private ValueAnimator mQsSizeChangeAnimator;

    private boolean mShowEmptyShadeView;

    private boolean mQsScrimEnabled = true;
    private boolean mLastAnnouncementWasQuickSettings;
    private boolean mQsTouchAboveFalsingThreshold;
    private int mQsFalsingThreshold;

    private float mKeyguardStatusBarAnimateAlpha = 1f;
    private int mOldLayoutDirection;
    private HeadsUpTouchHelper mHeadsUpTouchHelper;
    private boolean mIsExpansionFromHeadsUp;
    private boolean mListenForHeadsUp;
    private int mNavigationBarBottomHeight;
    private boolean mExpandingFromHeadsUp;
    private boolean mCollapsedOnDown;
    private int mPositionMinSideMargin;
    private int mMaxFadeoutHeight;
    private int mLastOrientation = -1;
    private boolean mClosingWithAlphaFadeOut;
    private boolean mHeadsUpAnimatingAway;
    private boolean mLaunchingAffordance;
    private boolean mAffordanceHasPreview;
    private FalsingManager mFalsingManager;
    private String mLastCameraLaunchSource = KeyguardBottomAreaView.CAMERA_LAUNCH_SOURCE_AFFORDANCE;

    private Runnable mHeadsUpExistenceChangedRunnable = new Runnable() {
        @Override
        public void run() {
            setHeadsUpAnimatingAway(false);
            notifyBarPanelExpansionChanged();
        }
    };
    private NotificationGroupManager mGroupManager;
    private boolean mShowIconsWhenExpanded;
    private int mIndicationBottomPadding;
    private int mAmbientIndicationBottomPadding;
    private boolean mIsFullWidth;
    private boolean mBlockingExpansionForCurrentTouch;

    /**
     * Following variables maintain state of events when input focus transfer may occur.
     */
    private boolean mExpectingSynthesizedDown; // expecting to see synthesized DOWN event
    private boolean mLastEventSynthesizedDown; // last event was synthesized DOWN event

    /**
     * Current dark amount that follows regular interpolation curve of animation.
     */
    private float mInterpolatedDarkAmount;

    /**
     * Dark amount that animates from 0 to 1 or vice-versa in linear manner, even if the
     * interpolation curve is different.
     */
    private float mLinearDarkAmount;

    private boolean mPulsing;
    private LockscreenGestureLogger mLockscreenGestureLogger = new LockscreenGestureLogger();
    private boolean mNoVisibleNotifications = true;
    private boolean mUserSetupComplete;
    private int mQsNotificationTopPadding;
    private float mExpandOffset;
    private boolean mHideIconsDuringNotificationLaunch = true;
    private int mStackScrollerMeasuringPass;
    private ArrayList<Consumer<ExpandableNotificationRow>> mTrackingHeadsUpListeners
            = new ArrayList<>();
    private ArrayList<Runnable> mVerticalTranslationListener = new ArrayList<>();
    private HeadsUpAppearanceController mHeadsUpAppearanceController;

    private int mPanelAlpha;
    private int mCurrentPanelAlpha;
    private final Paint mAlphaPaint = new Paint();
    private Runnable mPanelAlphaEndAction;
    private float mBottomAreaShadeAlpha;
    private final ValueAnimator mBottomAreaShadeAlphaAnimator;
    private AnimatorListenerAdapter mAnimatorListenerAdapter = new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            if (mPanelAlphaEndAction != null) {
                mPanelAlphaEndAction.run();
            }
        }
    };
    private final AnimatableProperty PANEL_ALPHA = AnimatableProperty.from(
            "panelAlpha",
            NotificationPanelView::setPanelAlphaInternal,
            NotificationPanelView::getCurrentPanelAlpha,
            R.id.panel_alpha_animator_tag,
            R.id.panel_alpha_animator_start_tag,
            R.id.panel_alpha_animator_end_tag);
    private final AnimationProperties PANEL_ALPHA_OUT_PROPERTIES = new AnimationProperties()
            .setDuration(150)
            .setCustomInterpolator(PANEL_ALPHA.getProperty(), Interpolators.ALPHA_OUT);
    private final AnimationProperties PANEL_ALPHA_IN_PROPERTIES = new AnimationProperties()
            .setDuration(200)
            .setAnimationFinishListener(mAnimatorListenerAdapter)
            .setCustomInterpolator(PANEL_ALPHA.getProperty(), Interpolators.ALPHA_IN);
    private final NotificationEntryManager mEntryManager;

    private final CommandQueue mCommandQueue;
    private final NotificationLockscreenUserManager mLockscreenUserManager;
    private final ShadeController mShadeController;
    private int mDisplayId;

    /**
     * Cache the resource id of the theme to avoid unnecessary work in onThemeChanged.
     *
     * onThemeChanged is forced when the theme might not have changed. So, to avoid unncessary
     * work, check the current id with the cached id.
     */
    private int mThemeResId;
    private KeyguardIndicationController mKeyguardIndicationController;
    private Consumer<Boolean> mAffordanceLaunchListener;
    private int mShelfHeight;
    private Runnable mOnReinflationListener;
    private int mDarkIconSize;
    private int mHeadsUpInset;
    private boolean mHeadsUpPinnedMode;
    private float mKeyguardHeadsUpShowingAmount = 0.0f;
    private boolean mShowingKeyguardHeadsUp;
    private boolean mAllowExpandForSmallExpansion;
    private Runnable mExpandAfterLayoutRunnable;

    /**
     * If face auth with bypass is running for the first time after you turn on the screen.
     * (From aod or screen off)
     */
    private boolean mFirstBypassAttempt;
    /**
     * If auth happens successfully during {@code mFirstBypassAttempt}, and we should wait until
     * the keyguard is dismissed to show the status bar.
     */
    private boolean mDelayShowingKeyguardStatusBar;

    private PluginManager mPluginManager;
    private FrameLayout mPluginFrame;
    private NPVPluginManager mNPVPluginManager;

    @Inject
    public NotificationPanelView(@Named(VIEW_CONTEXT) Context context, AttributeSet attrs,
            InjectionInflationController injectionInflationController,
            NotificationWakeUpCoordinator coordinator, PulseExpansionHandler pulseExpansionHandler,
            DynamicPrivacyController dynamicPrivacyController,
            KeyguardBypassController bypassController, FalsingManager falsingManager,
            PluginManager pluginManager, ShadeController shadeController,
            NotificationLockscreenUserManager notificationLockscreenUserManager,
            NotificationEntryManager notificationEntryManager,
            KeyguardStateController keyguardStateController,
            StatusBarStateController statusBarStateController, DozeLog dozeLog,
            DozeParameters dozeParameters, CommandQueue commandQueue) {
        super(context, attrs, falsingManager, dozeLog, keyguardStateController,
                (SysuiStatusBarStateController) statusBarStateController);
        setWillNotDraw(!DEBUG);
        mInjectionInflationController = injectionInflationController;
        mFalsingManager = falsingManager;
        mPowerManager = context.getSystemService(PowerManager.class);
        mWakeUpCoordinator = coordinator;
        mAccessibilityManager = context.getSystemService(AccessibilityManager.class);
        setAccessibilityPaneTitle(determineAccessibilityPaneTitle());
        mAlphaPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
        setPanelAlpha(255, false /* animate */);
        mCommandQueue = commandQueue;
        mDisplayId = context.getDisplayId();
        mPulseExpansionHandler = pulseExpansionHandler;
        mDozeParameters = dozeParameters;
        pulseExpansionHandler.setPulseExpandAbortListener(() -> {
            if (mQs != null) {
                mQs.animateHeaderSlidingOut();
            }
        });
        mThemeResId = context.getThemeResId();
        mKeyguardBypassController = bypassController;
        mUpdateMonitor = Dependency.get(KeyguardUpdateMonitor.class);
        mFirstBypassAttempt = mKeyguardBypassController.getBypassEnabled();
        mKeyguardStateController.addCallback(mKeyguardMonitorCallback);
        dynamicPrivacyController.addListener(this);

        mBottomAreaShadeAlphaAnimator = ValueAnimator.ofFloat(1f, 0);
        mBottomAreaShadeAlphaAnimator.addUpdateListener(animation -> {
            mBottomAreaShadeAlpha = (float) animation.getAnimatedValue();
            updateKeyguardBottomAreaAlpha();
        });
        mBottomAreaShadeAlphaAnimator.setDuration(160);
        mBottomAreaShadeAlphaAnimator.setInterpolator(Interpolators.ALPHA_OUT);
        mPluginManager = pluginManager;
        mShadeController = shadeController;
        mLockscreenUserManager = notificationLockscreenUserManager;
        mEntryManager = notificationEntryManager;

        setBackgroundColor(Color.TRANSPARENT);
    }

    /**
     * Returns if there's a custom clock being presented.
     */
    public boolean hasCustomClock() {
        return mKeyguardStatusView.hasCustomClock();
    }

    private void setStatusBar(StatusBar bar) {
        mStatusBar = bar;
        mKeyguardBottomArea.setStatusBar(mStatusBar);
    }

    /**
     * Call after this view has been fully inflated and had its children attached.
     */
    public void onChildrenAttached() {
        loadDimens();
        mKeyguardStatusBar = findViewById(R.id.keyguard_header);
        mKeyguardStatusView = findViewById(R.id.keyguard_status_view);

        KeyguardClockSwitch keyguardClockSwitch = findViewById(R.id.keyguard_clock_container);
        mBigClockContainer = findViewById(R.id.big_clock_container);
        keyguardClockSwitch.setBigClockContainer(mBigClockContainer);

        mHomeControlsLayout = findViewById(R.id.home_controls_layout);
        mNotificationContainerParent = findViewById(R.id.notification_container_parent);
        mNotificationStackScroller = findViewById(R.id.notification_stack_scroller);
        mNotificationStackScroller.setOnHeightChangedListener(this);
        mNotificationStackScroller.setOverscrollTopChangedListener(this);
        mNotificationStackScroller.setOnEmptySpaceClickListener(this);
        addTrackingHeadsUpListener(mNotificationStackScroller::setTrackingHeadsUp);
        mKeyguardBottomArea = findViewById(R.id.keyguard_bottom_area);
        mQsNavbarScrim = findViewById(R.id.qs_navbar_scrim);
        mLastOrientation = getResources().getConfiguration().orientation;
        mPluginFrame = findViewById(R.id.plugin_frame);
        if (Settings.System.getInt(
                mContext.getContentResolver(), "npv_plugin_flag", 0) == 1) {
            mNPVPluginManager = new NPVPluginManager(mPluginFrame, mPluginManager);
        }


        initBottomArea();

        mWakeUpCoordinator.setStackScroller(mNotificationStackScroller);
        mQsFrame = findViewById(R.id.qs_frame);
        mPulseExpansionHandler.setUp(mNotificationStackScroller, this, mShadeController);
        mWakeUpCoordinator.addListener(new NotificationWakeUpCoordinator.WakeUpListener() {
            @Override
            public void onFullyHiddenChanged(boolean isFullyHidden) {
                updateKeyguardStatusBarForHeadsUp();
            }

            @Override
            public void onPulseExpansionChanged(boolean expandingChanged) {
                if (mKeyguardBypassController.getBypassEnabled()) {
                    // Position the notifications while dragging down while pulsing
                    requestScrollerTopPaddingUpdate(false /* animate */);
                    updateQSPulseExpansion();
                }
            }
        });

        mPluginManager.addPluginListener(
                new PluginListener<HomeControlsPlugin>() {

                    @Override
                    public void onPluginConnected(HomeControlsPlugin plugin,
                                                  Context pluginContext) {
                        plugin.sendParentGroup(mHomeControlsLayout);
                    }

                    @Override
                    public void onPluginDisconnected(HomeControlsPlugin plugin) {

                    }
                }, HomeControlsPlugin.class, false);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        FragmentHostManager.get(this).addTagListener(QS.TAG, mFragmentListener);
        Dependency.get(StatusBarStateController.class).addCallback(this);
        Dependency.get(ZenModeController.class).addCallback(this);
        Dependency.get(ConfigurationController.class).addCallback(this);
        mUpdateMonitor.registerCallback(mKeyguardUpdateCallback);
        // Theme might have changed between inflating this view and attaching it to the window, so
        // force a call to onThemeChanged
        onThemeChanged();
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        FragmentHostManager.get(this).removeTagListener(QS.TAG, mFragmentListener);
        Dependency.get(StatusBarStateController.class).removeCallback(this);
        Dependency.get(ZenModeController.class).removeCallback(this);
        Dependency.get(ConfigurationController.class).removeCallback(this);
        mUpdateMonitor.removeCallback(mKeyguardUpdateCallback);
    }

    @Override
    protected void loadDimens() {
        super.loadDimens();
        mFlingAnimationUtils = new FlingAnimationUtils(getResources().getDisplayMetrics(), 0.4f);
        mStatusBarMinHeight = getResources().getDimensionPixelSize(
                com.android.internal.R.dimen.status_bar_height);
        mQsPeekHeight = getResources().getDimensionPixelSize(R.dimen.qs_peek_height);
        mNotificationsHeaderCollideDistance =
                getResources().getDimensionPixelSize(R.dimen.header_notifications_collide_distance);
        mUnlockMoveDistance = getResources().getDimensionPixelOffset(R.dimen.unlock_move_distance);
        mClockPositionAlgorithm.loadDimens(getResources());
        mQsFalsingThreshold = getResources().getDimensionPixelSize(
                R.dimen.qs_falsing_threshold);
        mPositionMinSideMargin = getResources().getDimensionPixelSize(
                R.dimen.notification_panel_min_side_margin);
        mMaxFadeoutHeight = getResources().getDimensionPixelSize(
                R.dimen.max_notification_fadeout_height);
        mIndicationBottomPadding = getResources().getDimensionPixelSize(
                R.dimen.keyguard_indication_bottom_padding);
        mQsNotificationTopPadding = getResources().getDimensionPixelSize(
                R.dimen.qs_notification_padding);
        mShelfHeight = getResources().getDimensionPixelSize(R.dimen.notification_shelf_height);
        mDarkIconSize = getResources().getDimensionPixelSize(
                R.dimen.status_bar_icon_drawing_size_dark);
        int statusbarHeight = getResources().getDimensionPixelSize(
                com.android.internal.R.dimen.status_bar_height);
        mHeadsUpInset = statusbarHeight + getResources().getDimensionPixelSize(
                R.dimen.heads_up_status_bar_padding);
        mQqsSplitFraction = ((float) getResources().getInteger(R.integer.qqs_split_fraction)) / (
                getResources().getInteger(R.integer.qqs_split_fraction)
                        + getResources().getInteger(R.integer.qs_split_fraction));
    }

    /**
     * @see #launchCamera(boolean, int)
     * @see #setLaunchingAffordance(boolean)
     */
    public void setLaunchAffordanceListener(Consumer<Boolean> listener) {
        mAffordanceLaunchListener = listener;
    }

    public void updateResources() {
        Resources res = getResources();
        int qsWidth = res.getDimensionPixelSize(R.dimen.qs_panel_width);
        int panelGravity = getResources().getInteger(R.integer.notification_panel_layout_gravity);
        FrameLayout.LayoutParams lp =
                (FrameLayout.LayoutParams) mQsFrame.getLayoutParams();
        if (lp.width != qsWidth || lp.gravity != panelGravity) {
            lp.width = qsWidth;
            lp.gravity = panelGravity;
            mQsFrame.setLayoutParams(lp);
        }

        int panelWidth = res.getDimensionPixelSize(R.dimen.notification_panel_width);
        lp = (FrameLayout.LayoutParams) mNotificationStackScroller.getLayoutParams();
        if (lp.width != panelWidth || lp.gravity != panelGravity) {
            lp.width = panelWidth;
            lp.gravity = panelGravity;
            mNotificationStackScroller.setLayoutParams(lp);
        }
        int sideMargin = res.getDimensionPixelOffset(R.dimen.notification_side_paddings);
        int topMargin = sideMargin;
        lp = (FrameLayout.LayoutParams) mPluginFrame.getLayoutParams();
        if (lp.width != qsWidth || lp.gravity != panelGravity || lp.leftMargin != sideMargin
                || lp.rightMargin != sideMargin || lp.topMargin != topMargin) {
            lp.width = qsWidth;
            lp.gravity = panelGravity;
            lp.leftMargin = sideMargin;
            lp.rightMargin = sideMargin;
            lp.topMargin = topMargin;
            mPluginFrame.setLayoutParams(lp);
        }
    }

    @Override
    public void onDensityOrFontScaleChanged() {
        updateShowEmptyShadeView();
    }

    @Override
    public void onThemeChanged() {
        final int themeResId = getContext().getThemeResId();
        if (mThemeResId == themeResId) {
            return;
        }
        mThemeResId = themeResId;

        reInflateViews();
    }

    @Override
    public void onOverlayChanged() {
        reInflateViews();
    }

    private void reInflateViews() {
        updateShowEmptyShadeView();

        // Re-inflate the status view group.
        int index = indexOfChild(mKeyguardStatusView);
        removeView(mKeyguardStatusView);
        mKeyguardStatusView = (KeyguardStatusView) mInjectionInflationController
                .injectable(LayoutInflater.from(mContext)).inflate(
                        R.layout.keyguard_status_view,
                        this,
                        false);
        addView(mKeyguardStatusView, index);

        // Re-associate the clock container with the keyguard clock switch.
        mBigClockContainer.removeAllViews();
        KeyguardClockSwitch keyguardClockSwitch = findViewById(R.id.keyguard_clock_container);
        keyguardClockSwitch.setBigClockContainer(mBigClockContainer);

        // Update keyguard bottom area
        index = indexOfChild(mKeyguardBottomArea);
        removeView(mKeyguardBottomArea);
        KeyguardBottomAreaView oldBottomArea = mKeyguardBottomArea;
        mKeyguardBottomArea = (KeyguardBottomAreaView) mInjectionInflationController
                .injectable(LayoutInflater.from(mContext)).inflate(
                        R.layout.keyguard_bottom_area,
                        this,
                        false);
        mKeyguardBottomArea.initFrom(oldBottomArea);
        addView(mKeyguardBottomArea, index);
        initBottomArea();
        mKeyguardIndicationController.setIndicationArea(mKeyguardBottomArea);
        onDozeAmountChanged(mStatusBarStateController.getDozeAmount(),
                mStatusBarStateController.getInterpolatedDozeAmount());

        if (mKeyguardStatusBar != null) {
            mKeyguardStatusBar.onThemeChanged();
        }

        setKeyguardStatusViewVisibility(mBarState, false, false);
        setKeyguardBottomAreaVisibility(mBarState, false);
        if (mOnReinflationListener != null) {
            mOnReinflationListener.run();
        }
        reinflatePluginContainer();
    }

    @Override
    public void onUiModeChanged() {
        reinflatePluginContainer();
    }

    private void reinflatePluginContainer() {
        int index = indexOfChild(mPluginFrame);
        removeView(mPluginFrame);
        mPluginFrame = (FrameLayout) mInjectionInflationController
                .injectable(LayoutInflater.from(mContext)).inflate(
                        R.layout.status_bar_expanded_plugin_frame,
                        this,
                        false);
        addView(mPluginFrame, index);

        Resources res = getResources();
        int qsWidth = res.getDimensionPixelSize(R.dimen.qs_panel_width);
        int panelGravity = getResources().getInteger(R.integer.notification_panel_layout_gravity);
        FrameLayout.LayoutParams lp;
        int sideMargin = res.getDimensionPixelOffset(R.dimen.notification_side_paddings);
        int topMargin =
                res.getDimensionPixelOffset(com.android.internal.R.dimen.quick_qs_total_height);
        if (Utils.useQsMediaPlayer(mContext)) {
            topMargin = res.getDimensionPixelOffset(
                    com.android.internal.R.dimen.quick_qs_total_height_with_media);
        }
        lp = (FrameLayout.LayoutParams) mPluginFrame.getLayoutParams();
        if (lp.width != qsWidth || lp.gravity != panelGravity || lp.leftMargin != sideMargin
                || lp.rightMargin != sideMargin || lp.topMargin != topMargin) {
            lp.width = qsWidth;
            lp.gravity = panelGravity;
            lp.leftMargin = sideMargin;
            lp.rightMargin = sideMargin;
            lp.topMargin = topMargin;
            mPluginFrame.setLayoutParams(lp);
        }

        if (mNPVPluginManager != null) mNPVPluginManager.replaceFrameLayout(mPluginFrame);
    }

    private void initBottomArea() {
        mAffordanceHelper = new KeyguardAffordanceHelper(this, getContext(), mFalsingManager);
        mKeyguardBottomArea.setAffordanceHelper(mAffordanceHelper);
        mKeyguardBottomArea.setStatusBar(mStatusBar);
        mKeyguardBottomArea.setUserSetupComplete(mUserSetupComplete);
    }

    public void setKeyguardIndicationController(KeyguardIndicationController indicationController) {
        mKeyguardIndicationController = indicationController;
        mKeyguardIndicationController.setIndicationArea(mKeyguardBottomArea);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        DejankUtils.startDetectingBlockingIpcs("NVP#onLayout");
        super.onLayout(changed, left, top, right, bottom);
        setIsFullWidth(mNotificationStackScroller.getWidth() == getWidth());

        // Update Clock Pivot
        mKeyguardStatusView.setPivotX(getWidth() / 2);
        mKeyguardStatusView.setPivotY((FONT_HEIGHT - CAP_HEIGHT) / 2048f *
                mKeyguardStatusView.getClockTextSize());

        // Calculate quick setting heights.
        int oldMaxHeight = mQsMaxExpansionHeight;
        if (mQs != null) {
            mQsMinExpansionHeight = mKeyguardShowing ? 0 : mQs.getQsMinExpansionHeight();
            if (mNPVPluginManager != null) {
                mNPVPluginManager.setYOffset(mQsMinExpansionHeight);
                mQsMinExpansionHeight += mNPVPluginManager.getHeight();
            }
            mQsMaxExpansionHeight = mQs.getDesiredHeight();
            mNotificationStackScroller.setMaxTopPadding(
                    mQsMaxExpansionHeight + mQsNotificationTopPadding);
        }
        positionClockAndNotifications();
        if (mQsExpanded && mQsFullyExpanded) {
            mQsExpansionHeight = mQsMaxExpansionHeight;
            requestScrollerTopPaddingUpdate(false /* animate */);
            requestPanelHeightUpdate();

            // Size has changed, start an animation.
            if (mQsMaxExpansionHeight != oldMaxHeight) {
                startQsSizeChangeAnimation(oldMaxHeight, mQsMaxExpansionHeight);
            }
        } else if (!mQsExpanded) {
            setQsExpansion(mQsMinExpansionHeight + mLastOverscroll);
        }
        updateExpandedHeight(getExpandedHeight());
        updateHeader();

        // If we are running a size change animation, the animation takes care of the height of
        // the container. However, if we are not animating, we always need to make the QS container
        // the desired height so when closing the QS detail, it stays smaller after the size change
        // animation is finished but the detail view is still being animated away (this animation
        // takes longer than the size change animation).
        if (mQsSizeChangeAnimator == null && mQs != null) {
            mQs.setHeightOverride(mQs.getDesiredHeight());
        }
        updateMaxHeadsUpTranslation();
        updateGestureExclusionRect();
        if (mExpandAfterLayoutRunnable != null) {
            mExpandAfterLayoutRunnable.run();
            mExpandAfterLayoutRunnable = null;
        }
        DejankUtils.stopDetectingBlockingIpcs("NVP#onLayout");
    }

    private void updateGestureExclusionRect() {
        Rect exclusionRect = calculateGestureExclusionRect();
        setSystemGestureExclusionRects(exclusionRect.isEmpty()
                ? Collections.EMPTY_LIST
                : Collections.singletonList(exclusionRect));
    }

    private Rect calculateGestureExclusionRect() {
        Rect exclusionRect = null;
        Region touchableRegion = mHeadsUpManager.calculateTouchableRegion();
        if (isFullyCollapsed() && touchableRegion != null) {
            // Note: The heads up manager also calculates the non-pinned touchable region
            exclusionRect = touchableRegion.getBounds();
        }
        return exclusionRect != null
                ? exclusionRect
                : mEmptyRect;
    }

    private void setIsFullWidth(boolean isFullWidth) {
        mIsFullWidth = isFullWidth;
        mNotificationStackScroller.setIsFullWidth(isFullWidth);
    }

    private void startQsSizeChangeAnimation(int oldHeight, final int newHeight) {
        if (mQsSizeChangeAnimator != null) {
            oldHeight = (int) mQsSizeChangeAnimator.getAnimatedValue();
            mQsSizeChangeAnimator.cancel();
        }
        mQsSizeChangeAnimator = ValueAnimator.ofInt(oldHeight, newHeight);
        mQsSizeChangeAnimator.setDuration(300);
        mQsSizeChangeAnimator.setInterpolator(Interpolators.FAST_OUT_SLOW_IN);
        mQsSizeChangeAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                requestScrollerTopPaddingUpdate(false /* animate */);
                requestPanelHeightUpdate();
                int height = (int) mQsSizeChangeAnimator.getAnimatedValue();
                mQs.setHeightOverride(height);
            }
        });
        mQsSizeChangeAnimator.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                mQsSizeChangeAnimator = null;
            }
        });
        mQsSizeChangeAnimator.start();
    }

    /**
     * Positions the clock and notifications dynamically depending on how many notifications are
     * showing.
     */
    private void positionClockAndNotifications() {
        boolean animate = mNotificationStackScroller.isAddOrRemoveAnimationPending();
        boolean animateClock = animate || mAnimateNextPositionUpdate;
        int stackScrollerPadding;
        if (mBarState != StatusBarState.KEYGUARD) {
            stackScrollerPadding = getUnlockedStackScrollerPadding();
        } else {
            int totalHeight = getHeight();
            int bottomPadding = Math.max(mIndicationBottomPadding, mAmbientIndicationBottomPadding);
            int clockPreferredY = mKeyguardStatusView.getClockPreferredY(totalHeight);
            boolean bypassEnabled = mKeyguardBypassController.getBypassEnabled();
            final boolean hasVisibleNotifications =
                    !bypassEnabled && mNotificationStackScroller.getVisibleNotificationCount() != 0;
            mKeyguardStatusView.setHasVisibleNotifications(hasVisibleNotifications);
            mClockPositionAlgorithm.setup(
                    mStatusBarMinHeight,
                    totalHeight - bottomPadding,
                    mNotificationStackScroller.getIntrinsicContentHeight(),
                    getExpandedFraction(),
                    totalHeight,
                    (int) (mKeyguardStatusView.getHeight()
                            - mShelfHeight / 2.0f - mDarkIconSize / 2.0f),
                    clockPreferredY,
                    hasCustomClock(),
                    hasVisibleNotifications,
                    mInterpolatedDarkAmount,
                    mEmptyDragAmount,
                    bypassEnabled,
                    getUnlockedStackScrollerPadding());
            mClockPositionAlgorithm.run(mClockPositionResult);
            PropertyAnimator.setProperty(mKeyguardStatusView, AnimatableProperty.X,
                    mClockPositionResult.clockX, CLOCK_ANIMATION_PROPERTIES, animateClock);
            PropertyAnimator.setProperty(mKeyguardStatusView, AnimatableProperty.Y,
                    mClockPositionResult.clockY, CLOCK_ANIMATION_PROPERTIES, animateClock);
            updateNotificationTranslucency();
            updateClock();
            stackScrollerPadding = mClockPositionResult.stackScrollerPaddingExpanded;
        }
        mNotificationStackScroller.setIntrinsicPadding(stackScrollerPadding);
        mKeyguardBottomArea.setAntiBurnInOffsetX(mClockPositionResult.clockX);

        mStackScrollerMeasuringPass++;
        requestScrollerTopPaddingUpdate(animate);
        mStackScrollerMeasuringPass = 0;
        mAnimateNextPositionUpdate = false;
    }

    /**
     * @return the padding of the stackscroller when unlocked
     */
    private int getUnlockedStackScrollerPadding() {
        return (mQs != null ? mQs.getHeader().getHeight() : 0) + mQsPeekHeight
                + mQsNotificationTopPadding;
    }

    /**
     * @param maximum the maximum to return at most
     * @return the maximum keyguard notifications that can fit on the screen
     */
    public int computeMaxKeyguardNotifications(int maximum) {
        float minPadding = mClockPositionAlgorithm.getMinStackScrollerPadding();
        int notificationPadding = Math.max(1, getResources().getDimensionPixelSize(
                R.dimen.notification_divider_height));
        NotificationShelf shelf = mNotificationStackScroller.getNotificationShelf();
        float shelfSize = shelf.getVisibility() == GONE ? 0
                : shelf.getIntrinsicHeight() + notificationPadding;
        float availableSpace = mNotificationStackScroller.getHeight() - minPadding - shelfSize
                - Math.max(mIndicationBottomPadding, mAmbientIndicationBottomPadding)
                - mKeyguardStatusView.getLogoutButtonHeight();
        int count = 0;
        for (int i = 0; i < mNotificationStackScroller.getChildCount(); i++) {
            ExpandableView child = (ExpandableView) mNotificationStackScroller.getChildAt(i);
            if (!(child instanceof ExpandableNotificationRow)) {
                continue;
            }
            ExpandableNotificationRow row = (ExpandableNotificationRow) child;
            boolean suppressedSummary = mGroupManager != null
                    && mGroupManager.isSummaryOfSuppressedGroup(row.getEntry().getSbn());
            if (suppressedSummary) {
                continue;
            }
            if (!mLockscreenUserManager.shouldShowOnKeyguard(row.getEntry())) {
                continue;
            }
            if (row.isRemoved()) {
                continue;
            }
            availableSpace -= child.getMinHeight(true /* ignoreTemporaryStates */)
                    + notificationPadding;
            if (availableSpace >= 0 && count < maximum) {
                count++;
            } else if (availableSpace > -shelfSize) {
                // if we are exactly the last view, then we can show us still!
                for (int j = i + 1; j < mNotificationStackScroller.getChildCount(); j++) {
                    if (mNotificationStackScroller.getChildAt(j)
                            instanceof ExpandableNotificationRow) {
                        return count;
                    }
                }
                count++;
                return count;
            } else {
                return count;
            }
        }
        return count;
    }

    private void updateClock() {
        if (!mKeyguardStatusViewAnimating) {
            mKeyguardStatusView.setAlpha(mClockPositionResult.clockAlpha);
        }
    }

    public void animateToFullShade(long delay) {
        mNotificationStackScroller.goToFullShade(delay);
        requestLayout();
        mAnimateNextPositionUpdate = true;
    }

    public void setQsExpansionEnabled(boolean qsExpansionEnabled) {
        mQsExpansionEnabled = qsExpansionEnabled;
        if (mQs == null) return;
        mQs.setHeaderClickable(qsExpansionEnabled);
    }

    @Override
    public void resetViews(boolean animate) {
        mIsLaunchTransitionFinished = false;
        mBlockTouches = false;
        if (!mLaunchingAffordance) {
            mAffordanceHelper.reset(false);
            mLastCameraLaunchSource = KeyguardBottomAreaView.CAMERA_LAUNCH_SOURCE_AFFORDANCE;
        }
        mStatusBar.getGutsManager().closeAndSaveGuts(true /* leavebehind */, true /* force */,
                true /* controls */, -1 /* x */, -1 /* y */, true /* resetMenu */);
        if (animate) {
            animateCloseQs(true /* animateAway */);
        } else {
            closeQs();
        }
        mNotificationStackScroller.setOverScrollAmount(0f, true /* onTop */, animate,
                !animate /* cancelAnimators */);
        mNotificationStackScroller.resetScrollPosition();
    }

    @Override
    public void collapse(boolean delayed, float speedUpFactor) {
        if (!canPanelBeCollapsed()) {
            return;
        }

        if (mQsExpanded) {
            mQsExpandImmediate = true;
            mNotificationStackScroller.setShouldShowShelfOnly(true);
        }
        super.collapse(delayed, speedUpFactor);
    }

    public void closeQs() {
        cancelQsAnimation();
        setQsExpansion(mQsMinExpansionHeight);
    }

    /**
     * Animate QS closing by flinging it.
     * If QS is expanded, it will collapse into QQS and stop.
     *
     * @param animateAway Do not stop when QS becomes QQS. Fling until QS isn't visible anymore.
     */
    public void animateCloseQs(boolean animateAway) {
        if (mQsExpansionAnimator != null) {
            if (!mQsAnimatorExpand) {
                return;
            }
            float height = mQsExpansionHeight;
            mQsExpansionAnimator.cancel();
            setQsExpansion(height);
        }
        flingSettings(0 /* vel */, animateAway ? FLING_HIDE : FLING_COLLAPSE);
    }

    public void expandWithQs() {
        if (mQsExpansionEnabled) {
            mQsExpandImmediate = true;
            mNotificationStackScroller.setShouldShowShelfOnly(true);
        }
        if (isFullyCollapsed()) {
            expand(true /* animate */);
        } else {
            flingSettings(0 /* velocity */, FLING_EXPAND);
        }
    }

    public void expandWithoutQs() {
        if (isQsExpanded()) {
            flingSettings(0 /* velocity */, FLING_COLLAPSE);
        } else {
            expand(true /* animate */);
        }
    }

    @Override
    public void fling(float vel, boolean expand) {
        GestureRecorder gr = ((PhoneStatusBarView) mBar).mBar.getGestureRecorder();
        if (gr != null) {
            gr.tag("fling " + ((vel > 0) ? "open" : "closed"), "notifications,v=" + vel);
        }
        super.fling(vel, expand);
    }

    @Override
    protected void flingToHeight(float vel, boolean expand, float target,
            float collapseSpeedUpFactor, boolean expandBecauseOfFalsing) {
        mHeadsUpTouchHelper.notifyFling(!expand);
        setClosingWithAlphaFadeout(!expand && !isOnKeyguard() && getFadeoutAlpha() == 1.0f);
        super.flingToHeight(vel, expand, target, collapseSpeedUpFactor, expandBecauseOfFalsing);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        if (mBlockTouches || mQsFullyExpanded && mQs.onInterceptTouchEvent(event)) {
            return false;
        }
        initDownStates(event);
        // Do not let touches go to shade or QS if the bouncer is visible,
        // but still let user swipe down to expand the panel, dismissing the bouncer.
        if (mStatusBar.isBouncerShowing()) {
            return true;
        }
        if (mBar.panelEnabled() && mHeadsUpTouchHelper.onInterceptTouchEvent(event)) {
            mIsExpansionFromHeadsUp = true;
            MetricsLogger.count(mContext, COUNTER_PANEL_OPEN, 1);
            MetricsLogger.count(mContext, COUNTER_PANEL_OPEN_PEEK, 1);
            return true;
        }
        if (!shouldQuickSettingsIntercept(mDownX, mDownY, 0)
                && mPulseExpansionHandler.onInterceptTouchEvent(event)) {
            return true;
        }

        if (!isFullyCollapsed() && onQsIntercept(event)) {
            return true;
        }
        return super.onInterceptTouchEvent(event);
    }

    private boolean onQsIntercept(MotionEvent event) {
        int pointerIndex = event.findPointerIndex(mTrackingPointer);
        if (pointerIndex < 0) {
            pointerIndex = 0;
            mTrackingPointer = event.getPointerId(pointerIndex);
        }
        final float x = event.getX(pointerIndex);
        final float y = event.getY(pointerIndex);

        switch (event.getActionMasked()) {
            case MotionEvent.ACTION_DOWN:
                mIntercepting = true;
                mInitialTouchY = y;
                mInitialTouchX = x;
                initVelocityTracker();
                trackMovement(event);
                if (shouldQuickSettingsIntercept(mInitialTouchX, mInitialTouchY, 0)) {
                    getParent().requestDisallowInterceptTouchEvent(true);
                }
                if (mQsExpansionAnimator != null) {
                    onQsExpansionStarted();
                    mInitialHeightOnTouch = mQsExpansionHeight;
                    mQsTracking = true;
                    mIntercepting = false;
                    mNotificationStackScroller.cancelLongPress();
                }
                break;
            case MotionEvent.ACTION_POINTER_UP:
                final int upPointer = event.getPointerId(event.getActionIndex());
                if (mTrackingPointer == upPointer) {
                    // gesture is ongoing, find a new pointer to track
                    final int newIndex = event.getPointerId(0) != upPointer ? 0 : 1;
                    mTrackingPointer = event.getPointerId(newIndex);
                    mInitialTouchX = event.getX(newIndex);
                    mInitialTouchY = event.getY(newIndex);
                }
                break;

            case MotionEvent.ACTION_MOVE:
                final float h = y - mInitialTouchY;
                trackMovement(event);
                if (mQsTracking) {

                    // Already tracking because onOverscrolled was called. We need to update here
                    // so we don't stop for a frame until the next touch event gets handled in
                    // onTouchEvent.
                    setQsExpansion(h + mInitialHeightOnTouch);
                    trackMovement(event);
                    mIntercepting = false;
                    return true;
                }
                if (Math.abs(h) > mTouchSlop && Math.abs(h) > Math.abs(x - mInitialTouchX)
                        && shouldQuickSettingsIntercept(mInitialTouchX, mInitialTouchY, h)) {
                    mQsTracking = true;
                    onQsExpansionStarted();
                    notifyExpandingFinished();
                    mInitialHeightOnTouch = mQsExpansionHeight;
                    mInitialTouchY = y;
                    mInitialTouchX = x;
                    mIntercepting = false;
                    mNotificationStackScroller.cancelLongPress();
                    return true;
                }
                break;

            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                trackMovement(event);
                if (mQsTracking) {
                    flingQsWithCurrentVelocity(y,
                            event.getActionMasked() == MotionEvent.ACTION_CANCEL);
                    mQsTracking = false;
                }
                mIntercepting = false;
                break;
        }
        return false;
    }

    @Override
    protected boolean isInContentBounds(float x, float y) {
        float stackScrollerX = mNotificationStackScroller.getX();
        return !mNotificationStackScroller.isBelowLastNotification(x - stackScrollerX, y)
                && stackScrollerX < x && x < stackScrollerX + mNotificationStackScroller.getWidth();
    }

    private void initDownStates(MotionEvent event) {
        if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
            mOnlyAffordanceInThisMotion = false;
            mQsTouchAboveFalsingThreshold = mQsFullyExpanded;
            mDozingOnDown = isDozing();
            mDownX = event.getX();
            mDownY = event.getY();
            mCollapsedOnDown = isFullyCollapsed();
            mListenForHeadsUp = mCollapsedOnDown && mHeadsUpManager.hasPinnedHeadsUp();
            mAllowExpandForSmallExpansion = mExpectingSynthesizedDown;
            mTouchSlopExceededBeforeDown = mExpectingSynthesizedDown;
            if (mExpectingSynthesizedDown) {
                mLastEventSynthesizedDown = true;
            } else {
                // down but not synthesized motion event.
                mLastEventSynthesizedDown = false;
            }
        } else {
            // not down event at all.
            mLastEventSynthesizedDown = false;
        }
    }

    private void flingQsWithCurrentVelocity(float y, boolean isCancelMotionEvent) {
        float vel = getCurrentQSVelocity();
        final boolean expandsQs = flingExpandsQs(vel);
        if (expandsQs) {
            logQsSwipeDown(y);
        }
        flingSettings(vel, expandsQs && !isCancelMotionEvent ? FLING_EXPAND : FLING_COLLAPSE);
    }

    private void logQsSwipeDown(float y) {
        float vel = getCurrentQSVelocity();
        final int gesture = mBarState == StatusBarState.KEYGUARD
                ? MetricsEvent.ACTION_LS_QS
                : MetricsEvent.ACTION_SHADE_QS_PULL;
        mLockscreenGestureLogger.write(gesture,
                (int) ((y - mInitialTouchY) / mStatusBar.getDisplayDensity()),
                (int) (vel / mStatusBar.getDisplayDensity()));
    }

    private boolean flingExpandsQs(float vel) {
        if (mFalsingManager.isUnlockingDisabled() || isFalseTouch()) {
            return false;
        }
        if (Math.abs(vel) < mFlingAnimationUtils.getMinVelocityPxPerSecond()) {
            return getQsExpansionFraction() > 0.5f;
        } else {
            return vel > 0;
        }
    }

    private boolean isFalseTouch() {
        if (!needsAntiFalsing()) {
            return false;
        }
        if (mFalsingManager.isClassifierEnabled()) {
            return mFalsingManager.isFalseTouch();
        }
        return !mQsTouchAboveFalsingThreshold;
    }

    private float getQsExpansionFraction() {
        return Math.min(1f, (mQsExpansionHeight - mQsMinExpansionHeight)
                / (mQsMaxExpansionHeight - mQsMinExpansionHeight));
    }

    @Override
    protected boolean shouldExpandWhenNotFlinging() {
        if (super.shouldExpandWhenNotFlinging()) {
            return true;
        }
        if (mAllowExpandForSmallExpansion) {
            // When we get a touch that came over from launcher, the velocity isn't always correct
            // Let's err on expanding if the gesture has been reasonably slow
            long timeSinceDown = SystemClock.uptimeMillis() - mDownTime;
            return timeSinceDown <= MAX_TIME_TO_OPEN_WHEN_FLINGING_FROM_LAUNCHER;
        }
        return false;
    }

    @Override
    protected float getOpeningHeight() {
        return mNotificationStackScroller.getOpeningHeight();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (mBlockTouches || (mQs != null && mQs.isCustomizing())) {
            return false;
        }

        // Do not allow panel expansion if bouncer is scrimmed, otherwise user would be able to
        // pull down QS or expand the shade.
        if (mStatusBar.isBouncerShowingScrimmed()) {
            return false;
        }

        // Make sure the next touch won't the blocked after the current ends.
        if (event.getAction() == MotionEvent.ACTION_UP
                || event.getAction() == MotionEvent.ACTION_CANCEL) {
            mBlockingExpansionForCurrentTouch = false;
        }
        // When touch focus transfer happens, ACTION_DOWN->ACTION_UP may happen immediately
        // without any ACTION_MOVE event.
        // In such case, simply expand the panel instead of being stuck at the bottom bar.
        if (mLastEventSynthesizedDown && event.getAction() == MotionEvent.ACTION_UP) {
            expand(true /* animate */);
        }
        initDownStates(event);
        if (!mIsExpanding && !shouldQuickSettingsIntercept(mDownX, mDownY, 0)
                && mPulseExpansionHandler.onTouchEvent(event)) {
            // We're expanding all the other ones shouldn't get this anymore
            return true;
        }
        if (mListenForHeadsUp && !mHeadsUpTouchHelper.isTrackingHeadsUp()
                && mHeadsUpTouchHelper.onInterceptTouchEvent(event)) {
            mIsExpansionFromHeadsUp = true;
            MetricsLogger.count(mContext, COUNTER_PANEL_OPEN_PEEK, 1);
        }
        boolean handled = false;
        if ((!mIsExpanding || mHintAnimationRunning)
                && !mQsExpanded
                && mBarState != StatusBarState.SHADE
                && !mDozing) {
            handled |= mAffordanceHelper.onTouchEvent(event);
        }
        if (mOnlyAffordanceInThisMotion) {
            return true;
        }
        handled |= mHeadsUpTouchHelper.onTouchEvent(event);

        if (!mHeadsUpTouchHelper.isTrackingHeadsUp() && handleQsTouch(event)) {
            return true;
        }
        if (event.getActionMasked() == MotionEvent.ACTION_DOWN && isFullyCollapsed()) {
            MetricsLogger.count(mContext, COUNTER_PANEL_OPEN, 1);
            updateVerticalPanelPosition(event.getX());
            handled = true;
        }
        handled |= super.onTouchEvent(event);
        return !mDozing || mPulsing || handled;
    }

    private boolean handleQsTouch(MotionEvent event) {
        final int action = event.getActionMasked();
        if (action == MotionEvent.ACTION_DOWN && getExpandedFraction() == 1f
                && mBarState != StatusBarState.KEYGUARD && !mQsExpanded
                && mQsExpansionEnabled) {

            // Down in the empty area while fully expanded - go to QS.
            mQsTracking = true;
            mConflictingQsExpansionGesture = true;
            onQsExpansionStarted();
            mInitialHeightOnTouch = mQsExpansionHeight;
            mInitialTouchY = event.getX();
            mInitialTouchX = event.getY();
        }
        if (!isFullyCollapsed()) {
            handleQsDown(event);
        }
        if (!mQsExpandImmediate && mQsTracking) {
            onQsTouch(event);
            if (!mConflictingQsExpansionGesture) {
                return true;
            }
        }
        if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
            mConflictingQsExpansionGesture = false;
        }
        if (action == MotionEvent.ACTION_DOWN && isFullyCollapsed()
                && mQsExpansionEnabled) {
            mTwoFingerQsExpandPossible = true;
        }
        if (mTwoFingerQsExpandPossible && isOpenQsEvent(event)
                && event.getY(event.getActionIndex()) < mStatusBarMinHeight) {
            MetricsLogger.count(mContext, COUNTER_PANEL_OPEN_QS, 1);
            mQsExpandImmediate = true;
            mNotificationStackScroller.setShouldShowShelfOnly(true);
            requestPanelHeightUpdate();

            // Normally, we start listening when the panel is expanded, but here we need to start
            // earlier so the state is already up to date when dragging down.
            setListening(true);
        }
        if (isQsSplitEnabled() && !mKeyguardShowing) {
            if (mQsExpandImmediate) {
                mNotificationStackScroller.setVisibility(View.GONE);
                mQsFrame.setVisibility(View.VISIBLE);
                mHomeControlsLayout.setVisibility(View.VISIBLE);
            } else {
                mNotificationStackScroller.setVisibility(View.VISIBLE);
                mQsFrame.setVisibility(View.GONE);
                mHomeControlsLayout.setVisibility(View.GONE);
            }
        }
        return false;
    }

    private boolean isInQsArea(float x, float y) {
        return (x >= mQsFrame.getX()
                && x <= mQsFrame.getX() + mQsFrame.getWidth())
                && (y <= mNotificationStackScroller.getBottomMostNotificationBottom()
                || y <= mQs.getView().getY() + mQs.getView().getHeight());
    }

    private boolean isOnQsEndArea(float x) {
        if (!isQsSplitEnabled()) return false;
        if (getLayoutDirection() == LAYOUT_DIRECTION_LTR) {
            return x >= mQsFrame.getX() + mQqsSplitFraction * mQsFrame.getWidth()
                    && x <= mQsFrame.getX() + mQsFrame.getWidth();
        } else {
            return x >= mQsFrame.getX()
                    && x <= mQsFrame.getX() + (1 - mQqsSplitFraction) * mQsFrame.getWidth();
        }
    }

    private boolean isOpenQsEvent(MotionEvent event) {
        final int pointerCount = event.getPointerCount();
        final int action = event.getActionMasked();

        final boolean twoFingerDrag = action == MotionEvent.ACTION_POINTER_DOWN
                && pointerCount == 2;

        final boolean stylusButtonClickDrag = action == MotionEvent.ACTION_DOWN
                && (event.isButtonPressed(MotionEvent.BUTTON_STYLUS_PRIMARY)
                || event.isButtonPressed(MotionEvent.BUTTON_STYLUS_SECONDARY));

        final boolean mouseButtonClickDrag = action == MotionEvent.ACTION_DOWN
                && (event.isButtonPressed(MotionEvent.BUTTON_SECONDARY)
                || event.isButtonPressed(MotionEvent.BUTTON_TERTIARY));

        final boolean onHeaderRight = isOnQsEndArea(event.getX());

        return twoFingerDrag || stylusButtonClickDrag || mouseButtonClickDrag || onHeaderRight;
    }

    private void handleQsDown(MotionEvent event) {
        if (event.getActionMasked() == MotionEvent.ACTION_DOWN
                && shouldQuickSettingsIntercept(event.getX(), event.getY(), -1)) {
            mFalsingManager.onQsDown();
            mQsTracking = true;
            onQsExpansionStarted();
            mInitialHeightOnTouch = mQsExpansionHeight;
            mInitialTouchY = event.getX();
            mInitialTouchX = event.getY();

            // If we interrupt an expansion gesture here, make sure to update the state correctly.
            notifyExpandingFinished();
        }
    }

    /**
     * Input focus transfer is about to happen.
     */
    public void startWaitingForOpenPanelGesture() {
        if (!isFullyCollapsed()) {
            return;
        }
        mExpectingSynthesizedDown = true;
        onTrackingStarted();
        updatePanelExpanded();
    }

    /**
     * Called when this view is no longer waiting for input focus transfer.
     *
     * There are two scenarios behind this function call. First, input focus transfer
     * has successfully happened and this view already received synthetic DOWN event.
     * (mExpectingSynthesizedDown == false). Do nothing.
     *
     * Second, before input focus transfer finished, user may have lifted finger
     * in previous window and this window never received synthetic DOWN event.
     * (mExpectingSynthesizedDown == true).
     * In this case, we use the velocity to trigger fling event.
     *
     * @param velocity unit is in px / millis
     */
    public void stopWaitingForOpenPanelGesture(final float velocity) {
        if (mExpectingSynthesizedDown) {
            mExpectingSynthesizedDown = false;
            maybeVibrateOnOpening();
            Runnable runnable = () -> fling(velocity > 1f ? 1000f * velocity : 0,
                    true /* expand */);
            if (mStatusBar.getStatusBarWindow().getHeight()
                    != mStatusBar.getStatusBarHeight()) {
                // The panel is already expanded to its full size, let's expand directly
                runnable.run();
            } else {
                mExpandAfterLayoutRunnable = runnable;
            }
            onTrackingStopped(false);
        }
    }

    @Override
    protected boolean flingExpands(float vel, float vectorVel, float x, float y) {
        boolean expands = super.flingExpands(vel, vectorVel, x, y);

        // If we are already running a QS expansion, make sure that we keep the panel open.
        if (mQsExpansionAnimator != null) {
            expands = true;
        }
        return expands;
    }

    @Override
    protected boolean shouldGestureWaitForTouchSlop() {
        if (mExpectingSynthesizedDown) {
            mExpectingSynthesizedDown = false;
            return false;
        }
        return isFullyCollapsed() || mBarState != StatusBarState.SHADE;
    }

    @Override
    protected boolean shouldGestureIgnoreXTouchSlop(float x, float y) {
        return !mAffordanceHelper.isOnAffordanceIcon(x, y);
    }

    private void onQsTouch(MotionEvent event) {
        int pointerIndex = event.findPointerIndex(mTrackingPointer);
        if (pointerIndex < 0) {
            pointerIndex = 0;
            mTrackingPointer = event.getPointerId(pointerIndex);
        }
        final float y = event.getY(pointerIndex);
        final float x = event.getX(pointerIndex);
        final float h = y - mInitialTouchY;

        switch (event.getActionMasked()) {
            case MotionEvent.ACTION_DOWN:
                mQsTracking = true;
                mInitialTouchY = y;
                mInitialTouchX = x;
                onQsExpansionStarted();
                mInitialHeightOnTouch = mQsExpansionHeight;
                initVelocityTracker();
                trackMovement(event);
                break;

            case MotionEvent.ACTION_POINTER_UP:
                final int upPointer = event.getPointerId(event.getActionIndex());
                if (mTrackingPointer == upPointer) {
                    // gesture is ongoing, find a new pointer to track
                    final int newIndex = event.getPointerId(0) != upPointer ? 0 : 1;
                    final float newY = event.getY(newIndex);
                    final float newX = event.getX(newIndex);
                    mTrackingPointer = event.getPointerId(newIndex);
                    mInitialHeightOnTouch = mQsExpansionHeight;
                    mInitialTouchY = newY;
                    mInitialTouchX = newX;
                }
                break;

            case MotionEvent.ACTION_MOVE:
                setQsExpansion(h + mInitialHeightOnTouch);
                if (h >= getFalsingThreshold()) {
                    mQsTouchAboveFalsingThreshold = true;
                }
                trackMovement(event);
                break;

            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                mQsTracking = false;
                mTrackingPointer = -1;
                trackMovement(event);
                float fraction = getQsExpansionFraction();
                if (fraction != 0f || y >= mInitialTouchY) {
                    flingQsWithCurrentVelocity(y,
                            event.getActionMasked() == MotionEvent.ACTION_CANCEL);
                }
                if (mQsVelocityTracker != null) {
                    mQsVelocityTracker.recycle();
                    mQsVelocityTracker = null;
                }
                break;
        }
    }

    private int getFalsingThreshold() {
        float factor = mStatusBar.isWakeUpComingFromTouch() ? 1.5f : 1.0f;
        return (int) (mQsFalsingThreshold * factor);
    }

    @Override
    public void onOverscrollTopChanged(float amount, boolean isRubberbanded) {
        cancelQsAnimation();
        if (!mQsExpansionEnabled) {
            amount = 0f;
        }
        float rounded = amount >= 1f ? amount : 0f;
        setOverScrolling(rounded != 0f && isRubberbanded);
        mQsExpansionFromOverscroll = rounded != 0f;
        mLastOverscroll = rounded;
        updateQsState();
        setQsExpansion(mQsMinExpansionHeight + rounded);
    }

    @Override
    public void flingTopOverscroll(float velocity, boolean open) {
        mLastOverscroll = 0f;
        mQsExpansionFromOverscroll = false;
        setQsExpansion(mQsExpansionHeight);
        flingSettings(!mQsExpansionEnabled && open ? 0f : velocity,
                open && mQsExpansionEnabled ? FLING_EXPAND : FLING_COLLAPSE,
                new Runnable() {
                    @Override
                    public void run() {
                        mStackScrollerOverscrolling = false;
                        setOverScrolling(false);
                        updateQsState();
                    }
                }, false /* isClick */);
    }

    private void setOverScrolling(boolean overscrolling) {
        mStackScrollerOverscrolling = overscrolling;
        if (mQs == null) return;
        mQs.setOverscrolling(overscrolling);
    }

    private void onQsExpansionStarted() {
        onQsExpansionStarted(0);
    }

    protected void onQsExpansionStarted(int overscrollAmount) {
        cancelQsAnimation();
        cancelHeightAnimator();

        // Reset scroll position and apply that position to the expanded height.
        float height = mQsExpansionHeight - overscrollAmount;
        setQsExpansion(height);
        requestPanelHeightUpdate();
        mNotificationStackScroller.checkSnoozeLeavebehind();

        // When expanding QS, let's authenticate the user if possible,
        // this will speed up notification actions.
        if (height == 0) {
            mStatusBar.requestFaceAuth();
        }
    }

    private void setQsExpanded(boolean expanded) {
        boolean changed = mQsExpanded != expanded;
        if (changed) {
            mQsExpanded = expanded;
            updateQsState();
            requestPanelHeightUpdate();
            mFalsingManager.setQsExpanded(expanded);
            mStatusBar.setQsExpanded(expanded);
            mNotificationContainerParent.setQsExpanded(expanded);
            mPulseExpansionHandler.setQsExpanded(expanded);
            mKeyguardBypassController.setQSExpanded(expanded);
        }
    }

    @Override
    public void onStateChanged(int statusBarState) {
        boolean goingToFullShade = mStatusBarStateController.goingToFullShade();
        boolean keyguardFadingAway = mKeyguardStateController.isKeyguardFadingAway();
        int oldState = mBarState;
        boolean keyguardShowing = statusBarState == StatusBarState.KEYGUARD;
        setKeyguardStatusViewVisibility(statusBarState, keyguardFadingAway, goingToFullShade);
        setKeyguardBottomAreaVisibility(statusBarState, goingToFullShade);

        mBarState = statusBarState;
        mKeyguardShowing = keyguardShowing;
        if (mKeyguardShowing && isQsSplitEnabled()) {
            mNotificationStackScroller.setVisibility(View.VISIBLE);
            mQsFrame.setVisibility(View.VISIBLE);
            mHomeControlsLayout.setVisibility(View.GONE);
        }

        if (oldState == StatusBarState.KEYGUARD
                && (goingToFullShade || statusBarState == StatusBarState.SHADE_LOCKED)) {
            animateKeyguardStatusBarOut();
            long delay = mBarState == StatusBarState.SHADE_LOCKED
                    ? 0 : mKeyguardStateController.calculateGoingToFullShadeDelay();
            mQs.animateHeaderSlidingIn(delay);
        } else if (oldState == StatusBarState.SHADE_LOCKED
                && statusBarState == StatusBarState.KEYGUARD) {
            animateKeyguardStatusBarIn(StackStateAnimator.ANIMATION_DURATION_STANDARD);
            mNotificationStackScroller.resetScrollPosition();
            // Only animate header if the header is visible. If not, it will partially animate out
            // the top of QS
            if (!mQsExpanded) {
                mQs.animateHeaderSlidingOut();
            }
        } else {
            mKeyguardStatusBar.setAlpha(1f);
            mKeyguardStatusBar.setVisibility(keyguardShowing ? View.VISIBLE : View.INVISIBLE);
            ((PhoneStatusBarView) mBar).maybeShowDivider(keyguardShowing);
            if (keyguardShowing && oldState != mBarState) {
                if (mQs != null) {
                    mQs.hideImmediately();
                }
            }
        }
        updateKeyguardStatusBarForHeadsUp();
        if (keyguardShowing) {
            updateDozingVisibilities(false /* animate */);
        }
        // THe update needs to happen after the headerSlide in above, otherwise the translation
        // would reset
        updateQSPulseExpansion();
        maybeAnimateBottomAreaAlpha();
        resetHorizontalPanelPosition();
        updateQsState();
    }

    private void maybeAnimateBottomAreaAlpha() {
        mBottomAreaShadeAlphaAnimator.cancel();
        if (mBarState == StatusBarState.SHADE_LOCKED) {
            mBottomAreaShadeAlphaAnimator.start();
        } else {
            mBottomAreaShadeAlpha = 1f;
        }
    }

    private final Runnable mAnimateKeyguardStatusViewInvisibleEndRunnable = new Runnable() {
        @Override
        public void run() {
            mKeyguardStatusViewAnimating = false;
            mKeyguardStatusView.setVisibility(View.INVISIBLE);
        }
    };

    private final Runnable mAnimateKeyguardStatusViewGoneEndRunnable = new Runnable() {
        @Override
        public void run() {
            mKeyguardStatusViewAnimating = false;
            mKeyguardStatusView.setVisibility(View.GONE);
        }
    };

    private final Runnable mAnimateKeyguardStatusViewVisibleEndRunnable = new Runnable() {
        @Override
        public void run() {
            mKeyguardStatusViewAnimating = false;
        }
    };

    private final Runnable mAnimateKeyguardStatusBarInvisibleEndRunnable = new Runnable() {
        @Override
        public void run() {
            mKeyguardStatusBar.setVisibility(View.INVISIBLE);
            mKeyguardStatusBar.setAlpha(1f);
            mKeyguardStatusBarAnimateAlpha = 1f;
        }
    };

    private void animateKeyguardStatusBarOut() {
        ValueAnimator anim = ValueAnimator.ofFloat(mKeyguardStatusBar.getAlpha(), 0f);
        anim.addUpdateListener(mStatusBarAnimateAlphaListener);
        anim.setStartDelay(mKeyguardStateController.isKeyguardFadingAway()
                ? mKeyguardStateController.getKeyguardFadingAwayDelay()
                : 0);

        long duration;
        if (mKeyguardStateController.isKeyguardFadingAway()) {
            duration = mKeyguardStateController.getShortenedFadingAwayDuration();
        } else {
            duration = StackStateAnimator.ANIMATION_DURATION_STANDARD;
        }
        anim.setDuration(duration);

        anim.setInterpolator(Interpolators.LINEAR_OUT_SLOW_IN);
        anim.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                mAnimateKeyguardStatusBarInvisibleEndRunnable.run();
            }
        });
        anim.start();
    }

    private final ValueAnimator.AnimatorUpdateListener mStatusBarAnimateAlphaListener =
            new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    mKeyguardStatusBarAnimateAlpha = (float) animation.getAnimatedValue();
                    updateHeaderKeyguardAlpha();
                }
            };

    private void animateKeyguardStatusBarIn(long duration) {
        mKeyguardStatusBar.setVisibility(View.VISIBLE);
        mKeyguardStatusBar.setAlpha(0f);
        ValueAnimator anim = ValueAnimator.ofFloat(0f, 1f);
        anim.addUpdateListener(mStatusBarAnimateAlphaListener);
        anim.setDuration(duration);
        anim.setInterpolator(Interpolators.LINEAR_OUT_SLOW_IN);
        anim.start();
    }

    private final Runnable mAnimateKeyguardBottomAreaInvisibleEndRunnable = new Runnable() {
        @Override
        public void run() {
            mKeyguardBottomArea.setVisibility(View.GONE);
        }
    };

    private void setKeyguardBottomAreaVisibility(int statusBarState, boolean goingToFullShade) {
        mKeyguardBottomArea.animate().cancel();
        if (goingToFullShade) {
            mKeyguardBottomArea.animate()
                    .alpha(0f)
                    .setStartDelay(mKeyguardStateController.getKeyguardFadingAwayDelay())
                    .setDuration(mKeyguardStateController.getShortenedFadingAwayDuration())
                    .setInterpolator(Interpolators.ALPHA_OUT)
                    .withEndAction(mAnimateKeyguardBottomAreaInvisibleEndRunnable)
                    .start();
        } else if (statusBarState == StatusBarState.KEYGUARD
                || statusBarState == StatusBarState.SHADE_LOCKED) {
            mKeyguardBottomArea.setVisibility(View.VISIBLE);
            mKeyguardBottomArea.setAlpha(1f);
        } else {
            mKeyguardBottomArea.setVisibility(View.GONE);
        }
    }

    private void setKeyguardStatusViewVisibility(int statusBarState, boolean keyguardFadingAway,
            boolean goingToFullShade) {
        mKeyguardStatusView.animate().cancel();
        mKeyguardStatusViewAnimating = false;
        if ((!keyguardFadingAway && mBarState == StatusBarState.KEYGUARD
                && statusBarState != StatusBarState.KEYGUARD) || goingToFullShade) {
            mKeyguardStatusViewAnimating = true;
            mKeyguardStatusView.animate()
                    .alpha(0f)
                    .setStartDelay(0)
                    .setDuration(160)
                    .setInterpolator(Interpolators.ALPHA_OUT)
                    .withEndAction(mAnimateKeyguardStatusViewGoneEndRunnable);
            if (keyguardFadingAway) {
                mKeyguardStatusView.animate()
                        .setStartDelay(mKeyguardStateController.getKeyguardFadingAwayDelay())
                        .setDuration(mKeyguardStateController.getShortenedFadingAwayDuration())
                        .start();
            }
        } else if (mBarState == StatusBarState.SHADE_LOCKED
                && statusBarState == StatusBarState.KEYGUARD) {
            mKeyguardStatusView.setVisibility(View.VISIBLE);
            mKeyguardStatusViewAnimating = true;
            mKeyguardStatusView.setAlpha(0f);
            mKeyguardStatusView.animate()
                    .alpha(1f)
                    .setStartDelay(0)
                    .setDuration(320)
                    .setInterpolator(Interpolators.ALPHA_IN)
                    .withEndAction(mAnimateKeyguardStatusViewVisibleEndRunnable);
        } else if (statusBarState == StatusBarState.KEYGUARD) {
            if (keyguardFadingAway) {
                mKeyguardStatusViewAnimating = true;
                mKeyguardStatusView.animate()
                        .alpha(0)
                        .translationYBy(-getHeight() * 0.05f)
                        .setInterpolator(Interpolators.FAST_OUT_LINEAR_IN)
                        .setDuration(125)
                        .setStartDelay(0)
                        .withEndAction(mAnimateKeyguardStatusViewInvisibleEndRunnable)
                        .start();
            } else {
                mKeyguardStatusView.setVisibility(View.VISIBLE);
                mKeyguardStatusView.setAlpha(1f);
            }
        } else {
            mKeyguardStatusView.setVisibility(View.GONE);
            mKeyguardStatusView.setAlpha(1f);
        }
    }

    private void updateQsState() {
        mNotificationStackScroller.setQsExpanded(mQsExpanded);
        mNotificationStackScroller.setScrollingEnabled(
                mBarState != StatusBarState.KEYGUARD && (!mQsExpanded
                        || mQsExpansionFromOverscroll));
        updateEmptyShadeView();
        if (mNPVPluginManager != null) {
            mNPVPluginManager.changeVisibility((mBarState != StatusBarState.KEYGUARD)
                    ? View.VISIBLE
                    : View.INVISIBLE);
        }
        mQsNavbarScrim.setVisibility(mBarState == StatusBarState.SHADE && mQsExpanded
                && !mStackScrollerOverscrolling && mQsScrimEnabled
                ? View.VISIBLE
                : View.INVISIBLE);
        if (mKeyguardUserSwitcher != null && mQsExpanded && !mStackScrollerOverscrolling) {
            mKeyguardUserSwitcher.hideIfNotSimple(true /* animate */);
        }
        if (mQs == null) return;
        mQs.setExpanded(mQsExpanded);
    }

    private void setQsExpansion(float height) {
        height = Math.min(Math.max(height, mQsMinExpansionHeight), mQsMaxExpansionHeight);
        mQsFullyExpanded = height == mQsMaxExpansionHeight && mQsMaxExpansionHeight != 0;
        if (height > mQsMinExpansionHeight && !mQsExpanded && !mStackScrollerOverscrolling
                && !mDozing) {
            setQsExpanded(true);
        } else if (height <= mQsMinExpansionHeight && mQsExpanded) {
            setQsExpanded(false);
        }
        mQsExpansionHeight = height;
        updateQsExpansion();
        requestScrollerTopPaddingUpdate(false /* animate */);
        updateHeaderKeyguardAlpha();
        if (mBarState == StatusBarState.SHADE_LOCKED
                || mBarState == StatusBarState.KEYGUARD) {
            updateKeyguardBottomAreaAlpha();
            updateBigClockAlpha();
        }
        if (mBarState == StatusBarState.SHADE && mQsExpanded
                && !mStackScrollerOverscrolling && mQsScrimEnabled) {
            mQsNavbarScrim.setAlpha(getQsExpansionFraction());
        }

        if (mAccessibilityManager.isEnabled()) {
            setAccessibilityPaneTitle(determineAccessibilityPaneTitle());
        }

        if (!mFalsingManager.isUnlockingDisabled() && mQsFullyExpanded
                && mFalsingManager.shouldEnforceBouncer()) {
            mStatusBar.executeRunnableDismissingKeyguard(null, null /* cancelAction */,
                    false /* dismissShade */, true /* afterKeyguardGone */, false /* deferred */);
        }
        for (int i = 0; i < mExpansionListeners.size(); i++) {
            mExpansionListeners.get(i).onQsExpansionChanged(mQsMaxExpansionHeight != 0
                    ? mQsExpansionHeight / mQsMaxExpansionHeight : 0);
        }
        if (DEBUG) {
            invalidate();
        }
    }

    protected void updateQsExpansion() {
        if (mQs == null) return;
        float qsExpansionFraction = getQsExpansionFraction();
        mQs.setQsExpansion(qsExpansionFraction, getHeaderTranslation());
        int heightDiff = mQs.getDesiredHeight() - mQs.getQsMinExpansionHeight();
        if (mNPVPluginManager != null) {
            mNPVPluginManager.setExpansion(qsExpansionFraction, getHeaderTranslation(), heightDiff);
        }
        mNotificationStackScroller.setQsExpansionFraction(qsExpansionFraction);
    }

    private String determineAccessibilityPaneTitle() {
        if (mQs != null && mQs.isCustomizing()) {
            return getContext().getString(R.string.accessibility_desc_quick_settings_edit);
        } else if (mQsExpansionHeight != 0.0f && mQsFullyExpanded) {
            // Upon initialisation when we are not layouted yet we don't want to announce that we
            // are fully expanded, hence the != 0.0f check.
            return getContext().getString(R.string.accessibility_desc_quick_settings);
        } else if (mBarState == StatusBarState.KEYGUARD) {
            return getContext().getString(R.string.accessibility_desc_lock_screen);
        } else {
            return getContext().getString(R.string.accessibility_desc_notification_shade);
        }
    }

    private float calculateQsTopPadding() {
        if (mKeyguardShowing
                && (mQsExpandImmediate || mIsExpanding && mQsExpandedWhenExpandingStarted)) {

            // Either QS pushes the notifications down when fully expanded, or QS is fully above the
            // notifications (mostly on tablets). maxNotificationPadding denotes the normal top
            // padding on Keyguard, maxQsPadding denotes the top padding from the quick settings
            // panel. We need to take the maximum and linearly interpolate with the panel expansion
            // for a nice motion.
            int maxNotificationPadding = getKeyguardNotificationStaticPadding();
            int maxQsPadding = mQsMaxExpansionHeight + mQsNotificationTopPadding;
            int max = mBarState == StatusBarState.KEYGUARD
                    ? Math.max(maxNotificationPadding, maxQsPadding)
                    : maxQsPadding;
            return (int) MathUtils.lerp((float) mQsMinExpansionHeight, (float) max,
                    getExpandedFraction());
        } else if (mQsSizeChangeAnimator != null) {
            return Math.max((int) mQsSizeChangeAnimator.getAnimatedValue(),
                    getKeyguardNotificationStaticPadding());
        } else if (mKeyguardShowing) {
            // We can only do the smoother transition on Keyguard when we also are not collapsing
            // from a scrolled quick settings.
            return MathUtils.lerp((float) getKeyguardNotificationStaticPadding(),
                    (float) (mQsMaxExpansionHeight + mQsNotificationTopPadding),
                    getQsExpansionFraction());
        } else {
            return mQsExpansionHeight + mQsNotificationTopPadding;
        }
    }

    /**
     * @return the topPadding of notifications when on keyguard not respecting quick settings
     *         expansion
     */
    private int getKeyguardNotificationStaticPadding() {
        if (!mKeyguardShowing) {
            return 0;
        }
        if (!mKeyguardBypassController.getBypassEnabled()) {
            return mClockPositionResult.stackScrollerPadding;
        }
        int collapsedPosition = mHeadsUpInset;
        if (!mNotificationStackScroller.isPulseExpanding()) {
            return collapsedPosition;
        } else {
            int expandedPosition = mClockPositionResult.stackScrollerPadding;
            return (int) MathUtils.lerp(collapsedPosition, expandedPosition,
                    mNotificationStackScroller.calculateAppearFractionBypass());
        }
    }


    protected void requestScrollerTopPaddingUpdate(boolean animate) {
        mNotificationStackScroller.updateTopPadding(calculateQsTopPadding(), animate);
        if (mKeyguardShowing && mKeyguardBypassController.getBypassEnabled()) {
            // update the position of the header
            updateQsExpansion();
        }
    }


    private void updateQSPulseExpansion() {
        if (mQs != null) {
            mQs.setShowCollapsedOnKeyguard(mKeyguardShowing
                    && mKeyguardBypassController.getBypassEnabled()
                    && mNotificationStackScroller.isPulseExpanding());
        }
    }

    private void trackMovement(MotionEvent event) {
        if (mQsVelocityTracker != null) mQsVelocityTracker.addMovement(event);
        mLastTouchX = event.getX();
        mLastTouchY = event.getY();
    }

    private void initVelocityTracker() {
        if (mQsVelocityTracker != null) {
            mQsVelocityTracker.recycle();
        }
        mQsVelocityTracker = VelocityTracker.obtain();
    }

    private float getCurrentQSVelocity() {
        if (mQsVelocityTracker == null) {
            return 0;
        }
        mQsVelocityTracker.computeCurrentVelocity(1000);
        return mQsVelocityTracker.getYVelocity();
    }

    private void cancelQsAnimation() {
        if (mQsExpansionAnimator != null) {
            mQsExpansionAnimator.cancel();
        }
    }

    /**
     * @see #flingSettings(float, int, Runnable, boolean)
     */
    public void flingSettings(float vel, int type) {
        flingSettings(vel, type, null, false /* isClick */);
    }

    /**
     * Animates QS or QQS as if the user had swiped up or down.
     *
     * @param vel Finger velocity or 0 when not initiated by touch events.
     * @param type Either {@link #FLING_EXPAND}, {@link #FLING_COLLAPSE} or {@link #FLING_HIDE}.
     * @param onFinishRunnable Runnable to be executed at the end of animation.
     * @param isClick If originated by click (different interpolator and duration.)
     */
    protected void flingSettings(float vel, int type, final Runnable onFinishRunnable,
            boolean isClick) {
        float target;
        switch (type) {
            case FLING_EXPAND:
                target = mQsMaxExpansionHeight;
                break;
            case FLING_COLLAPSE:
                target = mQsMinExpansionHeight;
                break;
            case FLING_HIDE:
            default:
                target = 0;
        }
        if (target == mQsExpansionHeight) {
            if (onFinishRunnable != null) {
                onFinishRunnable.run();
            }
            return;
        }

        // If we move in the opposite direction, reset velocity and use a different duration.
        boolean oppositeDirection = false;
        boolean expanding = type == FLING_EXPAND;
        if (vel > 0 && !expanding || vel < 0 && expanding) {
            vel = 0;
            oppositeDirection = true;
        }
        ValueAnimator animator = ValueAnimator.ofFloat(mQsExpansionHeight, target);
        if (isClick) {
            animator.setInterpolator(Interpolators.TOUCH_RESPONSE);
            animator.setDuration(368);
        } else {
            mFlingAnimationUtils.apply(animator, mQsExpansionHeight, target, vel);
        }
        if (oppositeDirection) {
            animator.setDuration(350);
        }
        animator.addUpdateListener(animation -> {
            setQsExpansion((Float) animation.getAnimatedValue());
        });
        animator.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                mNotificationStackScroller.resetCheckSnoozeLeavebehind();
                mQsExpansionAnimator = null;
                if (onFinishRunnable != null) {
                    onFinishRunnable.run();
                }
            }
        });
        animator.start();
        mQsExpansionAnimator = animator;
        mQsAnimatorExpand = expanding;
    }

    /**
     * @return Whether we should intercept a gesture to open Quick Settings.
     */
    private boolean shouldQuickSettingsIntercept(float x, float y, float yDiff) {
        if (!mQsExpansionEnabled || mCollapsedOnDown
                || (mKeyguardShowing && mKeyguardBypassController.getBypassEnabled())) {
            return false;
        }
        View header = mKeyguardShowing || mQs == null ? mKeyguardStatusBar : mQs.getHeader();
        final boolean onHeader = x >= mQsFrame.getX()
                && x <= mQsFrame.getX() + mQsFrame.getWidth()
                && y >= header.getTop() && y <= header.getBottom();
        if (mQsExpanded) {
            return onHeader || (yDiff < 0 && isInQsArea(x, y));
        } else {
            return onHeader;
        }
    }

    @Override
    protected boolean isScrolledToBottom() {
        if (!isInSettings()) {
            return mBarState == StatusBarState.KEYGUARD
                    || mNotificationStackScroller.isScrolledToBottom();
        } else {
            return true;
        }
    }

    @Override
    protected int getMaxPanelHeight() {
        if (mKeyguardBypassController.getBypassEnabled() && mBarState == StatusBarState.KEYGUARD) {
            return getMaxPanelHeightBypass();
        } else {
            return getMaxPanelHeightNonBypass();
        }
    }

    private int getMaxPanelHeightNonBypass() {
        int min = mStatusBarMinHeight;
        if (!(mBarState == StatusBarState.KEYGUARD)
                && mNotificationStackScroller.getNotGoneChildCount() == 0) {
            int minHeight = (int) (mQsMinExpansionHeight + getOverExpansionAmount());
            min = Math.max(min, minHeight);
        }
        int maxHeight;
        if (mQsExpandImmediate || mQsExpanded || mIsExpanding && mQsExpandedWhenExpandingStarted
                || mPulsing) {
            maxHeight = calculatePanelHeightQsExpanded();
        } else {
            maxHeight = calculatePanelHeightShade();
        }
        maxHeight = Math.max(maxHeight, min);
        return maxHeight;
    }

    private int getMaxPanelHeightBypass() {
        int position = mClockPositionAlgorithm.getExpandedClockPosition()
                + mKeyguardStatusView.getHeight();
        if (mNotificationStackScroller.getVisibleNotificationCount() != 0) {
            position += mShelfHeight / 2.0f + mDarkIconSize / 2.0f;
        }
        return position;
    }

    public boolean isInSettings() {
        return mQsExpanded;
    }

    public boolean isExpanding() {
        return mIsExpanding;
    }

    @Override
    protected void onHeightUpdated(float expandedHeight) {
        if (!mQsExpanded || mQsExpandImmediate || mIsExpanding && mQsExpandedWhenExpandingStarted) {
            // Updating the clock position will set the top padding which might
            // trigger a new panel height and re-position the clock.
            // This is a circular dependency and should be avoided, otherwise we'll have
            // a stack overflow.
            if (mStackScrollerMeasuringPass > 2) {
                if (DEBUG) Log.d(TAG, "Unstable notification panel height. Aborting.");
            } else {
                positionClockAndNotifications();
            }
        }
        if (mQsExpandImmediate || mQsExpanded && !mQsTracking && mQsExpansionAnimator == null
                && !mQsExpansionFromOverscroll) {
            float t;
            if (mKeyguardShowing) {

                // On Keyguard, interpolate the QS expansion linearly to the panel expansion
                t = expandedHeight / (getMaxPanelHeight());
            } else {
                // In Shade, interpolate linearly such that QS is closed whenever panel height is
                // minimum QS expansion + minStackHeight
                float panelHeightQsCollapsed = mNotificationStackScroller.getIntrinsicPadding()
                        + mNotificationStackScroller.getLayoutMinHeight();
                float panelHeightQsExpanded = calculatePanelHeightQsExpanded();
                t = (expandedHeight - panelHeightQsCollapsed)
                        / (panelHeightQsExpanded - panelHeightQsCollapsed);
            }
            float targetHeight = mQsMinExpansionHeight
                    + t * (mQsMaxExpansionHeight - mQsMinExpansionHeight);
            setQsExpansion(targetHeight);
            mHomeControlsLayout.setTranslationY(targetHeight);
        }
        updateExpandedHeight(expandedHeight);
        updateHeader();
        updateNotificationTranslucency();
        updatePanelExpanded();
        updateGestureExclusionRect();
        if (DEBUG) {
            invalidate();
        }
    }

    private void updatePanelExpanded() {
        boolean isExpanded = !isFullyCollapsed() || mExpectingSynthesizedDown;
        if (mPanelExpanded != isExpanded) {
            mHeadsUpManager.setIsPanelExpanded(isExpanded);
            mStatusBar.setPanelExpanded(isExpanded);
            mPanelExpanded = isExpanded;
        }
    }

    private int calculatePanelHeightShade() {
        int emptyBottomMargin = mNotificationStackScroller.getEmptyBottomMargin();
        int maxHeight = mNotificationStackScroller.getHeight() - emptyBottomMargin;
        maxHeight += mNotificationStackScroller.getTopPaddingOverflow();

        if (mBarState == StatusBarState.KEYGUARD) {
            int minKeyguardPanelBottom = mClockPositionAlgorithm.getExpandedClockPosition()
                    + mKeyguardStatusView.getHeight()
                    + mNotificationStackScroller.getIntrinsicContentHeight();
            return Math.max(maxHeight, minKeyguardPanelBottom);
        } else {
            return maxHeight;
        }
    }

    private int calculatePanelHeightQsExpanded() {
        float notificationHeight = mNotificationStackScroller.getHeight()
                - mNotificationStackScroller.getEmptyBottomMargin()
                - mNotificationStackScroller.getTopPadding();

        // When only empty shade view is visible in QS collapsed state, simulate that we would have
        // it in expanded QS state as well so we don't run into troubles when fading the view in/out
        // and expanding/collapsing the whole panel from/to quick settings.
        if (mNotificationStackScroller.getNotGoneChildCount() == 0
                && mShowEmptyShadeView) {
            notificationHeight = mNotificationStackScroller.getEmptyShadeViewHeight();
        }
        int maxQsHeight = mQsMaxExpansionHeight;

        if (mKeyguardShowing) {
            maxQsHeight += mQsNotificationTopPadding;
        }

        // If an animation is changing the size of the QS panel, take the animated value.
        if (mQsSizeChangeAnimator != null) {
            maxQsHeight = (int) mQsSizeChangeAnimator.getAnimatedValue();
        }
        float totalHeight = Math.max(
                maxQsHeight, mBarState == StatusBarState.KEYGUARD
                        ? mClockPositionResult.stackScrollerPadding : 0)
                + notificationHeight + mNotificationStackScroller.getTopPaddingOverflow();
        if (totalHeight > mNotificationStackScroller.getHeight()) {
            float fullyCollapsedHeight = maxQsHeight
                    + mNotificationStackScroller.getLayoutMinHeight();
            totalHeight = Math.max(fullyCollapsedHeight, mNotificationStackScroller.getHeight());
        }
        return (int) totalHeight;
    }

    private void updateNotificationTranslucency() {
        float alpha = 1f;
        if (mClosingWithAlphaFadeOut && !mExpandingFromHeadsUp &&
                !mHeadsUpManager.hasPinnedHeadsUp()) {
            alpha = getFadeoutAlpha();
        }
        if (mBarState == StatusBarState.KEYGUARD && !mHintAnimationRunning
                && !mKeyguardBypassController.getBypassEnabled()) {
            alpha *= mClockPositionResult.clockAlpha;
        }
        mNotificationStackScroller.setAlpha(alpha);
    }

    private float getFadeoutAlpha() {
        float alpha;
        if (mQsMinExpansionHeight == 0) {
            return 1.0f;
        }
        alpha = getExpandedHeight() / mQsMinExpansionHeight;
        alpha = Math.max(0, Math.min(alpha, 1));
        alpha = (float) Math.pow(alpha, 0.75);
        return alpha;
    }

    @Override
    protected float getOverExpansionAmount() {
        return mNotificationStackScroller.getCurrentOverScrollAmount(true /* top */);
    }

    @Override
    protected float getOverExpansionPixels() {
        return mNotificationStackScroller.getCurrentOverScrolledPixels(true /* top */);
    }

    /**
     * Hides the header when notifications are colliding with it.
     */
    private void updateHeader() {
        if (mBarState == StatusBarState.KEYGUARD) {
            updateHeaderKeyguardAlpha();
        }
        updateQsExpansion();
    }

    protected float getHeaderTranslation() {
        if (mBarState == StatusBarState.KEYGUARD && !mKeyguardBypassController.getBypassEnabled()) {
            return -mQs.getQsMinExpansionHeight();
        }
        float appearAmount = mNotificationStackScroller.calculateAppearFraction(mExpandedHeight);
        float startHeight = -mQsExpansionHeight;
        if (mKeyguardBypassController.getBypassEnabled() && isOnKeyguard()
                && mNotificationStackScroller.isPulseExpanding()) {
            if (!mPulseExpansionHandler.isExpanding()
                    && !mPulseExpansionHandler.getLeavingLockscreen()) {
                // If we aborted the expansion we need to make sure the header doesn't reappear
                // again after the header has animated away
                appearAmount = 0;
            } else {
                appearAmount = mNotificationStackScroller.calculateAppearFractionBypass();
            }
            startHeight = -mQs.getQsMinExpansionHeight();
            if (mNPVPluginManager != null) startHeight -= mNPVPluginManager.getHeight();
        }
        float translation = MathUtils.lerp(startHeight, 0,
                Math.min(1.0f, appearAmount))
                + mExpandOffset;
        return Math.min(0, translation);
    }

    /**
     * @return the alpha to be used to fade out the contents on Keyguard (status bar, bottom area)
     *         during swiping up
     */
    private float getKeyguardContentsAlpha() {
        float alpha;
        if (mBarState == StatusBarState.KEYGUARD) {

            // When on Keyguard, we hide the header as soon as we expanded close enough to the
            // header
            alpha = getExpandedHeight()
                    /
                    (mKeyguardStatusBar.getHeight() + mNotificationsHeaderCollideDistance);
        } else {

            // In SHADE_LOCKED, the top card is already really close to the header. Hide it as
            // soon as we start translating the stack.
            alpha = getExpandedHeight() / mKeyguardStatusBar.getHeight();
        }
        alpha = MathUtils.saturate(alpha);
        alpha = (float) Math.pow(alpha, 0.75);
        return alpha;
    }

    private void updateHeaderKeyguardAlpha() {
        if (!mKeyguardShowing) {
            return;
        }
        float alphaQsExpansion = 1 - Math.min(1, getQsExpansionFraction() * 2);
        float newAlpha = Math.min(getKeyguardContentsAlpha(), alphaQsExpansion)
                * mKeyguardStatusBarAnimateAlpha;
        newAlpha *= 1.0f - mKeyguardHeadsUpShowingAmount;
        mKeyguardStatusBar.setAlpha(newAlpha);
        boolean hideForBypass = mFirstBypassAttempt && mUpdateMonitor.shouldListenForFace()
                || mDelayShowingKeyguardStatusBar;
        mKeyguardStatusBar.setVisibility(newAlpha != 0f && !mDozing && !hideForBypass
                ? VISIBLE : INVISIBLE);
    }

    private void updateKeyguardBottomAreaAlpha() {
        // There are two possible panel expansion behaviors:
        // • User dragging up to unlock: we want to fade out as quick as possible
        //   (ALPHA_EXPANSION_THRESHOLD) to avoid seeing the bouncer over the bottom area.
        // • User tapping on lock screen: bouncer won't be visible but panel expansion will
        //   change due to "unlock hint animation." In this case, fading out the bottom area
        //   would also hide the message that says "swipe to unlock," we don't want to do that.
        float expansionAlpha = MathUtils.map(isUnlockHintRunning()
                        ? 0 : KeyguardBouncer.ALPHA_EXPANSION_THRESHOLD, 1f,
                0f, 1f, getExpandedFraction());
        float alpha = Math.min(expansionAlpha, 1 - getQsExpansionFraction());
        alpha *= mBottomAreaShadeAlpha;
        mKeyguardBottomArea.setAffordanceAlpha(alpha);
        mKeyguardBottomArea.setImportantForAccessibility(alpha == 0f
                ? IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
                : IMPORTANT_FOR_ACCESSIBILITY_AUTO);
        View ambientIndicationContainer = mStatusBar.getAmbientIndicationContainer();
        if (ambientIndicationContainer != null) {
            ambientIndicationContainer.setAlpha(alpha);
        }
    }

    /**
     * Custom clock fades away when user drags up to unlock or pulls down quick settings.
     *
     * Updates alpha of custom clock to match the alpha of the KeyguardBottomArea. See
     * {@link updateKeyguardBottomAreaAlpha}.
     */
    private void updateBigClockAlpha() {
        float expansionAlpha = MathUtils.map(isUnlockHintRunning()
                ? 0 : KeyguardBouncer.ALPHA_EXPANSION_THRESHOLD, 1f, 0f, 1f, getExpandedFraction());
        float alpha = Math.min(expansionAlpha, 1 - getQsExpansionFraction());
        mBigClockContainer.setAlpha(alpha);
    }

    @Override
    protected void onExpandingStarted() {
        super.onExpandingStarted();
        mNotificationStackScroller.onExpansionStarted();
        mIsExpanding = true;
        mQsExpandedWhenExpandingStarted = mQsFullyExpanded;
        if (mQsExpanded) {
            onQsExpansionStarted();
        }
        // Since there are QS tiles in the header now, we need to make sure we start listening
        // immediately so they can be up to date.
        if (mQs == null) return;
        mQs.setHeaderListening(true);
    }

    @Override
    protected void onExpandingFinished() {
        super.onExpandingFinished();
        mNotificationStackScroller.onExpansionStopped();
        mHeadsUpManager.onExpandingFinished();
        mIsExpanding = false;
        if (isFullyCollapsed()) {
            DejankUtils.postAfterTraversal(new Runnable() {
                @Override
                public void run() {
                    setListening(false);
                }
            });

            // Workaround b/22639032: Make sure we invalidate something because else RenderThread
            // thinks we are actually drawing a frame put in reality we don't, so RT doesn't go
            // ahead with rendering and we jank.
            postOnAnimation(new Runnable() {
                @Override
                public void run() {
                    getParent().invalidateChild(NotificationPanelView.this, mDummyDirtyRect);
                }
            });
        } else {
            setListening(true);
        }
        mQsExpandImmediate = false;
        mNotificationStackScroller.setShouldShowShelfOnly(false);
        mTwoFingerQsExpandPossible = false;
        mIsExpansionFromHeadsUp = false;
        notifyListenersTrackingHeadsUp(null);
        mExpandingFromHeadsUp = false;
        setPanelScrimMinFraction(0.0f);
    }

    private void notifyListenersTrackingHeadsUp(ExpandableNotificationRow pickedChild) {
        for (int i = 0; i < mTrackingHeadsUpListeners.size(); i++) {
            Consumer<ExpandableNotificationRow> listener
                    = mTrackingHeadsUpListeners.get(i);
            listener.accept(pickedChild);
        }
    }

    private void setListening(boolean listening) {
        mKeyguardStatusBar.setListening(listening);
        if (mQs == null) return;
        mQs.setListening(listening);
        if (mNPVPluginManager != null) mNPVPluginManager.setListening(listening);
    }

    @Override
    public void expand(boolean animate) {
        super.expand(animate);
        setListening(true);
    }

    @Override
    protected void setOverExpansion(float overExpansion, boolean isPixels) {
        if (mConflictingQsExpansionGesture || mQsExpandImmediate) {
            return;
        }
        if (mBarState != StatusBarState.KEYGUARD) {
            mNotificationStackScroller.setOnHeightChangedListener(null);
            if (isPixels) {
                mNotificationStackScroller.setOverScrolledPixels(
                        overExpansion, true /* onTop */, false /* animate */);
            } else {
                mNotificationStackScroller.setOverScrollAmount(
                        overExpansion, true /* onTop */, false /* animate */);
            }
            mNotificationStackScroller.setOnHeightChangedListener(this);
        }
    }

    @Override
    protected void onTrackingStarted() {
        mFalsingManager.onTrackingStarted(!mKeyguardStateController.canDismissLockScreen());
        super.onTrackingStarted();
        if (mQsFullyExpanded) {
            mQsExpandImmediate = true;
            mNotificationStackScroller.setShouldShowShelfOnly(true);
        }
        if (mBarState == StatusBarState.KEYGUARD
                || mBarState == StatusBarState.SHADE_LOCKED) {
            mAffordanceHelper.animateHideLeftRightIcon();
        }
        mNotificationStackScroller.onPanelTrackingStarted();
    }

    @Override
    protected void onTrackingStopped(boolean expand) {
        mFalsingManager.onTrackingStopped();
        super.onTrackingStopped(expand);
        if (expand) {
            mNotificationStackScroller.setOverScrolledPixels(
                    0.0f, true /* onTop */, true /* animate */);
        }
        mNotificationStackScroller.onPanelTrackingStopped();
        if (expand && (mBarState == StatusBarState.KEYGUARD
                || mBarState == StatusBarState.SHADE_LOCKED)) {
            if (!mHintAnimationRunning) {
                mAffordanceHelper.reset(true);
            }
        }
    }

    @Override
    public void onHeightChanged(ExpandableView view, boolean needsAnimation) {

        // Block update if we are in quick settings and just the top padding changed
        // (i.e. view == null).
        if (view == null && mQsExpanded) {
            return;
        }
        if (needsAnimation && mInterpolatedDarkAmount == 0) {
            mAnimateNextPositionUpdate = true;
        }
        ExpandableView firstChildNotGone = mNotificationStackScroller.getFirstChildNotGone();
        ExpandableNotificationRow firstRow = firstChildNotGone instanceof ExpandableNotificationRow
                ? (ExpandableNotificationRow) firstChildNotGone
                : null;
        if (firstRow != null
                && (view == firstRow || (firstRow.getNotificationParent() == firstRow))) {
            requestScrollerTopPaddingUpdate(false /* animate */);
        }
        requestPanelHeightUpdate();
    }

    @Override
    public void onReset(ExpandableView view) {
    }

    public void onQsHeightChanged() {
        mQsMaxExpansionHeight = mQs != null ? mQs.getDesiredHeight() : 0;
        if (mQsExpanded && mQsFullyExpanded) {
            mQsExpansionHeight = mQsMaxExpansionHeight;
            requestScrollerTopPaddingUpdate(false /* animate */);
            requestPanelHeightUpdate();
        }
        if (mAccessibilityManager.isEnabled()) {
            setAccessibilityPaneTitle(determineAccessibilityPaneTitle());
        }
        mNotificationStackScroller.setMaxTopPadding(
                mQsMaxExpansionHeight + mQsNotificationTopPadding);
    }

    @Override
    protected void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        mAffordanceHelper.onConfigurationChanged();
        if (newConfig.orientation != mLastOrientation) {
            resetHorizontalPanelPosition();
        }
        mLastOrientation = newConfig.orientation;
    }

    @Override
    public WindowInsets onApplyWindowInsets(WindowInsets insets) {
        mNavigationBarBottomHeight = insets.getStableInsetBottom();
        updateMaxHeadsUpTranslation();
        return insets;
    }

    private void updateMaxHeadsUpTranslation() {
        mNotificationStackScroller.setHeadsUpBoundaries(getHeight(), mNavigationBarBottomHeight);
    }

    @Override
    public void onRtlPropertiesChanged(int layoutDirection) {
        if (layoutDirection != mOldLayoutDirection) {
            mAffordanceHelper.onRtlPropertiesChanged();
            mOldLayoutDirection = layoutDirection;
        }
    }

    @Override
    public void onClick(View v) {
        onQsExpansionStarted();
        if (mQsExpanded) {
            flingSettings(0 /* vel */, FLING_COLLAPSE, null /* onFinishRunnable */,
                    true /* isClick */);
        } else if (mQsExpansionEnabled) {
            mLockscreenGestureLogger.write(MetricsEvent.ACTION_SHADE_QS_TAP, 0, 0);
            flingSettings(0 /* vel */, FLING_EXPAND, null /* onFinishRunnable */,
                    true /* isClick */);
        }
    }

    @Override
    public void onAnimationToSideStarted(boolean rightPage, float translation, float vel) {
        boolean start = getLayoutDirection() == LAYOUT_DIRECTION_RTL ? rightPage : !rightPage;
        mIsLaunchTransitionRunning = true;
        mLaunchAnimationEndRunnable = null;
        float displayDensity = mStatusBar.getDisplayDensity();
        int lengthDp = Math.abs((int) (translation / displayDensity));
        int velocityDp = Math.abs((int) (vel / displayDensity));
        if (start) {
            mLockscreenGestureLogger.write(MetricsEvent.ACTION_LS_DIALER, lengthDp, velocityDp);

            mFalsingManager.onLeftAffordanceOn();
            if (mFalsingManager.shouldEnforceBouncer()) {
                mStatusBar.executeRunnableDismissingKeyguard(new Runnable() {
                    @Override
                    public void run() {
                        mKeyguardBottomArea.launchLeftAffordance();
                    }
                }, null, true /* dismissShade */, false /* afterKeyguardGone */,
                        true /* deferred */);
            } else {
                mKeyguardBottomArea.launchLeftAffordance();
            }
        } else {
            if (KeyguardBottomAreaView.CAMERA_LAUNCH_SOURCE_AFFORDANCE.equals(
                    mLastCameraLaunchSource)) {
                mLockscreenGestureLogger.write(MetricsEvent.ACTION_LS_CAMERA, lengthDp, velocityDp);
            }
            mFalsingManager.onCameraOn();
            if (mFalsingManager.shouldEnforceBouncer()) {
                mStatusBar.executeRunnableDismissingKeyguard(new Runnable() {
                    @Override
                    public void run() {
                        mKeyguardBottomArea.launchCamera(mLastCameraLaunchSource);
                    }
                }, null, true /* dismissShade */, false /* afterKeyguardGone */,
                    true /* deferred */);
            }
            else {
                mKeyguardBottomArea.launchCamera(mLastCameraLaunchSource);
            }
        }
        mStatusBar.startLaunchTransitionTimeout();
        mBlockTouches = true;
    }

    @Override
    public void onAnimationToSideEnded() {
        mIsLaunchTransitionRunning = false;
        mIsLaunchTransitionFinished = true;
        if (mLaunchAnimationEndRunnable != null) {
            mLaunchAnimationEndRunnable.run();
            mLaunchAnimationEndRunnable = null;
        }
        mStatusBar.readyForKeyguardDone();
    }

    @Override
    protected void startUnlockHintAnimation() {
        if (mPowerManager.isPowerSaveMode()) {
            onUnlockHintStarted();
            onUnlockHintFinished();
            return;
        }
        super.startUnlockHintAnimation();
    }

    @Override
    public float getMaxTranslationDistance() {
        return (float) Math.hypot(getWidth(), getHeight());
    }

    @Override
    public void onSwipingStarted(boolean rightIcon) {
        mFalsingManager.onAffordanceSwipingStarted(rightIcon);
        boolean camera = getLayoutDirection() == LAYOUT_DIRECTION_RTL ? !rightIcon
                : rightIcon;
        if (camera) {
            mKeyguardBottomArea.bindCameraPrewarmService();
        }
        requestDisallowInterceptTouchEvent(true);
        mOnlyAffordanceInThisMotion = true;
        mQsTracking = false;
    }

    @Override
    public void onSwipingAborted() {
        mFalsingManager.onAffordanceSwipingAborted();
        mKeyguardBottomArea.unbindCameraPrewarmService(false /* launched */);
    }

    @Override
    public void onIconClicked(boolean rightIcon) {
        if (mHintAnimationRunning) {
            return;
        }
        mHintAnimationRunning = true;
        mAffordanceHelper.startHintAnimation(rightIcon, new Runnable() {
            @Override
            public void run() {
                mHintAnimationRunning = false;
                mStatusBar.onHintFinished();
            }
        });
        rightIcon = getLayoutDirection() == LAYOUT_DIRECTION_RTL ? !rightIcon : rightIcon;
        if (rightIcon) {
            mStatusBar.onCameraHintStarted();
        } else {
            if (mKeyguardBottomArea.isLeftVoiceAssist()) {
                mStatusBar.onVoiceAssistHintStarted();
            } else {
                mStatusBar.onPhoneHintStarted();
            }
        }
    }

    @Override
    protected void onUnlockHintFinished() {
        super.onUnlockHintFinished();
        mNotificationStackScroller.setUnlockHintRunning(false);
    }

    @Override
    protected void onUnlockHintStarted() {
        super.onUnlockHintStarted();
        mNotificationStackScroller.setUnlockHintRunning(true);
    }

    @Override
    public KeyguardAffordanceView getLeftIcon() {
        return getLayoutDirection() == LAYOUT_DIRECTION_RTL
                ? mKeyguardBottomArea.getRightView()
                : mKeyguardBottomArea.getLeftView();
    }

    @Override
    public KeyguardAffordanceView getRightIcon() {
        return getLayoutDirection() == LAYOUT_DIRECTION_RTL
                ? mKeyguardBottomArea.getLeftView()
                : mKeyguardBottomArea.getRightView();
    }

    @Override
    public View getLeftPreview() {
        return getLayoutDirection() == LAYOUT_DIRECTION_RTL
                ? mKeyguardBottomArea.getRightPreview()
                : mKeyguardBottomArea.getLeftPreview();
    }

    @Override
    public View getRightPreview() {
        return getLayoutDirection() == LAYOUT_DIRECTION_RTL
                ? mKeyguardBottomArea.getLeftPreview()
                : mKeyguardBottomArea.getRightPreview();
    }

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

    @Override
    public boolean needsAntiFalsing() {
        return mBarState == StatusBarState.KEYGUARD;
    }

    @Override
    protected float getPeekHeight() {
        if (mNotificationStackScroller.getNotGoneChildCount() > 0) {
            return mNotificationStackScroller.getPeekHeight();
        } else {
            return mQsMinExpansionHeight;
        }
    }

    @Override
    protected boolean shouldUseDismissingAnimation() {
        return mBarState != StatusBarState.SHADE
                && (mKeyguardStateController.canDismissLockScreen() || !isTracking());
    }

    @Override
    protected boolean fullyExpandedClearAllVisible() {
        return mNotificationStackScroller.isFooterViewNotGone()
                && mNotificationStackScroller.isScrolledToBottom() && !mQsExpandImmediate;
    }

    @Override
    protected boolean isClearAllVisible() {
        return mNotificationStackScroller.isFooterViewContentVisible();
    }

    @Override
    protected int getClearAllHeight() {
        return mNotificationStackScroller.getFooterViewHeight();
    }

    @Override
    protected boolean isTrackingBlocked() {
        return mConflictingQsExpansionGesture && mQsExpanded || mBlockingExpansionForCurrentTouch;
    }

    public boolean isQsExpanded() {
        return mQsExpanded;
    }

    public boolean isQsDetailShowing() {
        return mQs.isShowingDetail();
    }

    public void closeQsDetail() {
        mQs.closeDetail();
    }

    @Override
    public boolean shouldDelayChildPressedState() {
        return true;
    }

    public boolean isLaunchTransitionFinished() {
        return mIsLaunchTransitionFinished;
    }

    public boolean isLaunchTransitionRunning() {
        return mIsLaunchTransitionRunning;
    }

    public void setLaunchTransitionEndRunnable(Runnable r) {
        mLaunchAnimationEndRunnable = r;
    }

    public void setEmptyDragAmount(float amount) {
        mEmptyDragAmount = amount * 0.2f;
        positionClockAndNotifications();
    }

    private void updateDozingVisibilities(boolean animate) {
        mKeyguardBottomArea.setDozing(mDozing, animate);
        if (!mDozing && animate) {
            animateKeyguardStatusBarIn(StackStateAnimator.ANIMATION_DURATION_STANDARD);
        }
    }

    @Override
    public boolean isDozing() {
        return mDozing;
    }

    public void showEmptyShadeView(boolean emptyShadeViewVisible) {
        mShowEmptyShadeView = emptyShadeViewVisible;
        updateEmptyShadeView();
    }

    private void updateEmptyShadeView() {
        // Hide "No notifications" in QS.
        mNotificationStackScroller.updateEmptyShadeView(mShowEmptyShadeView && !mQsExpanded);
    }

    public void setQsScrimEnabled(boolean qsScrimEnabled) {
        boolean changed = mQsScrimEnabled != qsScrimEnabled;
        mQsScrimEnabled = qsScrimEnabled;
        if (changed) {
            updateQsState();
        }
    }

    public void setKeyguardUserSwitcher(KeyguardUserSwitcher keyguardUserSwitcher) {
        mKeyguardUserSwitcher = keyguardUserSwitcher;
    }

    public void onScreenTurningOn() {
        mKeyguardStatusView.dozeTimeTick();
    }

    @Override
    public void onEmptySpaceClicked(float x, float y) {
        onEmptySpaceClick(x);
    }

    @Override
    protected boolean onMiddleClicked() {
        switch (mBarState) {
            case StatusBarState.KEYGUARD:
                if (!mDozingOnDown) {
                    if (mKeyguardBypassController.getBypassEnabled()) {
                        mUpdateMonitor.requestFaceAuth();
                    } else {
                        mLockscreenGestureLogger.write(
                                MetricsEvent.ACTION_LS_HINT,
                                0 /* lengthDp - N/A */, 0 /* velocityDp - N/A */);
                        startUnlockHintAnimation();
                    }
                }
                return true;
            case StatusBarState.SHADE_LOCKED:
                if (!mQsExpanded) {
                    mStatusBarStateController.setState(StatusBarState.KEYGUARD);
                }
                return true;
            case StatusBarState.SHADE:

                // This gets called in the middle of the touch handling, where the state is still
                // that we are tracking the panel. Collapse the panel after this is done.
                post(mPostCollapseRunnable);
                return false;
            default:
                return true;
        }
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        if (mCurrentPanelAlpha != 255) {
            canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), mAlphaPaint);
        }
    }

    public float getCurrentPanelAlpha() {
        return mCurrentPanelAlpha;
    }

    public boolean setPanelAlpha(int alpha, boolean animate) {
        if (mPanelAlpha != alpha) {
            mPanelAlpha = alpha;
            PropertyAnimator.setProperty(this, PANEL_ALPHA, alpha,
                    alpha == 255 ? PANEL_ALPHA_IN_PROPERTIES : PANEL_ALPHA_OUT_PROPERTIES, animate);
            return true;
        }
        return false;
    }

    public void setPanelAlphaInternal(float alpha) {
        mCurrentPanelAlpha = (int) alpha;
        mAlphaPaint.setARGB(mCurrentPanelAlpha, 255, 255, 255);
        invalidate();
    }

    public void setPanelAlphaEndAction(Runnable r) {
        mPanelAlphaEndAction = r;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        if (DEBUG) {
            Paint p = new Paint();
            p.setColor(Color.RED);
            p.setStrokeWidth(2);
            p.setStyle(Paint.Style.STROKE);
            canvas.drawLine(0, getMaxPanelHeight(), getWidth(), getMaxPanelHeight(), p);
            p.setColor(Color.BLUE);
            canvas.drawLine(0, getExpandedHeight(), getWidth(), getExpandedHeight(), p);
            p.setColor(Color.GREEN);
            canvas.drawLine(0, calculatePanelHeightQsExpanded(), getWidth(),
                    calculatePanelHeightQsExpanded(), p);
            p.setColor(Color.YELLOW);
            canvas.drawLine(0, calculatePanelHeightShade(), getWidth(),
                    calculatePanelHeightShade(), p);
            p.setColor(Color.MAGENTA);
            canvas.drawLine(0, calculateQsTopPadding(), getWidth(),
                    calculateQsTopPadding(), p);
            p.setColor(Color.CYAN);
            canvas.drawLine(0, mClockPositionResult.stackScrollerPadding, getWidth(),
                    mNotificationStackScroller.getTopPadding(), p);
            p.setColor(Color.GRAY);
            canvas.drawLine(0, mClockPositionResult.clockY, getWidth(),
                    mClockPositionResult.clockY, p);
        }
    }

    @Override
    public void onHeadsUpPinnedModeChanged(final boolean inPinnedMode) {
        mNotificationStackScroller.setInHeadsUpPinnedMode(inPinnedMode);
        if (inPinnedMode) {
            mHeadsUpExistenceChangedRunnable.run();
            updateNotificationTranslucency();
        } else {
            setHeadsUpAnimatingAway(true);
            mNotificationStackScroller.runAfterAnimationFinished(
                    mHeadsUpExistenceChangedRunnable);
        }
        updateGestureExclusionRect();
        mHeadsUpPinnedMode = inPinnedMode;
        updateHeadsUpVisibility();
        updateKeyguardStatusBarForHeadsUp();
    }

    private void updateKeyguardStatusBarForHeadsUp() {
        boolean showingKeyguardHeadsUp = mKeyguardShowing
                && mHeadsUpAppearanceController.shouldBeVisible();
        if (mShowingKeyguardHeadsUp != showingKeyguardHeadsUp) {
            mShowingKeyguardHeadsUp = showingKeyguardHeadsUp;
            if (mKeyguardShowing) {
                PropertyAnimator.setProperty(this, KEYGUARD_HEADS_UP_SHOWING_AMOUNT,
                        showingKeyguardHeadsUp ? 1.0f : 0.0f, KEYGUARD_HUN_PROPERTIES,
                        true /* animate */);
            } else {
                PropertyAnimator.applyImmediately(this, KEYGUARD_HEADS_UP_SHOWING_AMOUNT, 0.0f);
            }
        }
    }

    private void setKeyguardHeadsUpShowingAmount(float amount) {
        mKeyguardHeadsUpShowingAmount = amount;
        updateHeaderKeyguardAlpha();
    }

    private float getKeyguardHeadsUpShowingAmount() {
        return mKeyguardHeadsUpShowingAmount;
    }

    public void setHeadsUpAnimatingAway(boolean headsUpAnimatingAway) {
        mHeadsUpAnimatingAway = headsUpAnimatingAway;
        mNotificationStackScroller.setHeadsUpAnimatingAway(headsUpAnimatingAway);
        updateHeadsUpVisibility();
    }

    private void updateHeadsUpVisibility() {
        ((PhoneStatusBarView) mBar).setHeadsUpVisible(mHeadsUpAnimatingAway || mHeadsUpPinnedMode);
    }

    @Override
    public void onHeadsUpPinned(NotificationEntry entry) {
        if (!isOnKeyguard()) {
            mNotificationStackScroller.generateHeadsUpAnimation(entry.getHeadsUpAnimationView(),
                    true);
        }
    }

    @Override
    public void onHeadsUpUnPinned(NotificationEntry entry) {

        // When we're unpinning the notification via active edge they remain heads-upped,
        // we need to make sure that an animation happens in this case, otherwise the notification
        // will stick to the top without any interaction.
        if (isFullyCollapsed() && entry.isRowHeadsUp() && !isOnKeyguard()) {
            mNotificationStackScroller.generateHeadsUpAnimation(
                    entry.getHeadsUpAnimationView(), false);
            entry.setHeadsUpIsVisible();
        }
    }

    @Override
    public void onHeadsUpStateChanged(NotificationEntry entry, boolean isHeadsUp) {
        mNotificationStackScroller.generateHeadsUpAnimation(entry, isHeadsUp);
    }

    @Override
    public void setHeadsUpManager(HeadsUpManagerPhone headsUpManager) {
        super.setHeadsUpManager(headsUpManager);
        mHeadsUpTouchHelper = new HeadsUpTouchHelper(headsUpManager,
                mNotificationStackScroller.getHeadsUpCallback(), this);
    }

    public void setTrackedHeadsUp(ExpandableNotificationRow pickedChild) {
        if (pickedChild != null) {
            notifyListenersTrackingHeadsUp(pickedChild);
            mExpandingFromHeadsUp = true;
        }
        // otherwise we update the state when the expansion is finished
    }

    @Override
    protected void onClosingFinished() {
        super.onClosingFinished();
        resetHorizontalPanelPosition();
        setClosingWithAlphaFadeout(false);
    }

    private void setClosingWithAlphaFadeout(boolean closing) {
        mClosingWithAlphaFadeOut = closing;
        mNotificationStackScroller.forceNoOverlappingRendering(closing);
    }

    /**
     * Updates the vertical position of the panel so it is positioned closer to the touch
     * responsible for opening the panel.
     *
     * @param x the x-coordinate the touch event
     */
    protected void updateVerticalPanelPosition(float x) {
        if (mNotificationStackScroller.getWidth() * 1.75f > getWidth()) {
            resetHorizontalPanelPosition();
            return;
        }
        float leftMost = mPositionMinSideMargin + mNotificationStackScroller.getWidth() / 2;
        float rightMost = getWidth() - mPositionMinSideMargin
                - mNotificationStackScroller.getWidth() / 2;
        if (Math.abs(x - getWidth() / 2) < mNotificationStackScroller.getWidth() / 4) {
            x = getWidth() / 2;
        }
        x = Math.min(rightMost, Math.max(leftMost, x));
        float center =
                mNotificationStackScroller.getLeft() + mNotificationStackScroller.getWidth() / 2;
        setHorizontalPanelTranslation(x - center);
    }

    private void resetHorizontalPanelPosition() {
        setHorizontalPanelTranslation(0f);
    }

    protected void setHorizontalPanelTranslation(float translation) {
        mNotificationStackScroller.setTranslationX(translation);
        mQsFrame.setTranslationX(translation);
        int size = mVerticalTranslationListener.size();
        for (int i = 0; i < size; i++) {
            mVerticalTranslationListener.get(i).run();
        }
    }

    protected void updateExpandedHeight(float expandedHeight) {
        if (mTracking) {
            mNotificationStackScroller.setExpandingVelocity(getCurrentExpandVelocity());
        }
        if (mKeyguardBypassController.getBypassEnabled() && isOnKeyguard()) {
            // The expandedHeight is always the full panel Height when bypassing
            expandedHeight = getMaxPanelHeightNonBypass();
        }
        mNotificationStackScroller.setExpandedHeight(expandedHeight);
        updateKeyguardBottomAreaAlpha();
        updateBigClockAlpha();
        updateStatusBarIcons();
    }

    /**
     * @return whether the notifications are displayed full width and don't have any margins on
     *         the side.
     */
    public boolean isFullWidth() {
        return mIsFullWidth;
    }

    private void updateStatusBarIcons() {
        boolean showIconsWhenExpanded = (isPanelVisibleBecauseOfHeadsUp() || isFullWidth())
                && getExpandedHeight() < getOpeningHeight();
        if (showIconsWhenExpanded && mNoVisibleNotifications && isOnKeyguard()) {
            showIconsWhenExpanded = false;
        }
        if (showIconsWhenExpanded != mShowIconsWhenExpanded) {
            mShowIconsWhenExpanded = showIconsWhenExpanded;
            mCommandQueue.recomputeDisableFlags(mDisplayId, false);
        }
    }

    private boolean isOnKeyguard() {
        return mBarState == StatusBarState.KEYGUARD;
    }

    public void setPanelScrimMinFraction(float minFraction) {
        mBar.panelScrimMinFractionChanged(minFraction);
    }

    public void clearNotificationEffects() {
        mStatusBar.clearNotificationEffects();
    }

    @Override
    protected boolean isPanelVisibleBecauseOfHeadsUp() {
        return (mHeadsUpManager.hasPinnedHeadsUp() || mHeadsUpAnimatingAway)
                && mBarState == StatusBarState.SHADE;
    }

    @Override
    public boolean hasOverlappingRendering() {
        return !mDozing;
    }

    public void launchCamera(boolean animate, int source) {
        if (source == StatusBarManager.CAMERA_LAUNCH_SOURCE_POWER_DOUBLE_TAP) {
            mLastCameraLaunchSource = KeyguardBottomAreaView.CAMERA_LAUNCH_SOURCE_POWER_DOUBLE_TAP;
        } else if (source == StatusBarManager.CAMERA_LAUNCH_SOURCE_WIGGLE) {
            mLastCameraLaunchSource = KeyguardBottomAreaView.CAMERA_LAUNCH_SOURCE_WIGGLE;
        } else if (source == StatusBarManager.CAMERA_LAUNCH_SOURCE_LIFT_TRIGGER) {
            mLastCameraLaunchSource = KeyguardBottomAreaView.CAMERA_LAUNCH_SOURCE_LIFT_TRIGGER;
        } else {

            // Default.
            mLastCameraLaunchSource = KeyguardBottomAreaView.CAMERA_LAUNCH_SOURCE_AFFORDANCE;
        }

        // If we are launching it when we are occluded already we don't want it to animate,
        // nor setting these flags, since the occluded state doesn't change anymore, hence it's
        // never reset.
        if (!isFullyCollapsed()) {
            setLaunchingAffordance(true);
        } else {
            animate = false;
        }
        mAffordanceHasPreview = mKeyguardBottomArea.getRightPreview() != null;
        mAffordanceHelper.launchAffordance(animate, getLayoutDirection() == LAYOUT_DIRECTION_RTL);
    }

    public void onAffordanceLaunchEnded() {
        setLaunchingAffordance(false);
    }

    /**
     * Set whether we are currently launching an affordance. This is currently only set when
     * launched via a camera gesture.
     */
    private void setLaunchingAffordance(boolean launchingAffordance) {
        mLaunchingAffordance = launchingAffordance;
        getLeftIcon().setLaunchingAffordance(launchingAffordance);
        getRightIcon().setLaunchingAffordance(launchingAffordance);
        mKeyguardBypassController.setLaunchingAffordance(launchingAffordance);
        if (mAffordanceLaunchListener != null) {
            mAffordanceLaunchListener.accept(launchingAffordance);
        }
    }

    /**
     * Return true when a bottom affordance is launching an occluded activity with a splash screen.
     */
    public boolean isLaunchingAffordanceWithPreview() {
        return mLaunchingAffordance && mAffordanceHasPreview;
    }

    /**
     * Whether the camera application can be launched for the camera launch gesture.
     */
    public boolean canCameraGestureBeLaunched() {
        if (!mStatusBar.isCameraAllowedByAdmin()) {
            return false;
        }

        ResolveInfo resolveInfo = mKeyguardBottomArea.resolveCameraIntent();
        String packageToLaunch = (resolveInfo == null || resolveInfo.activityInfo == null)
                ? null : resolveInfo.activityInfo.packageName;
        return packageToLaunch != null &&
                (mBarState != StatusBarState.SHADE || !isForegroundApp(packageToLaunch))
                && !mAffordanceHelper.isSwipingInProgress();
    }

    /**
     * Return true if the applications with the package name is running in foreground.
     *
     * @param pkgName application package name.
     */
    private boolean isForegroundApp(String pkgName) {
        ActivityManager am = getContext().getSystemService(ActivityManager.class);
        List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);
        return !tasks.isEmpty() && pkgName.equals(tasks.get(0).topActivity.getPackageName());
    }

    private void setGroupManager(NotificationGroupManager groupManager) {
        mGroupManager = groupManager;
    }

    public boolean hideStatusBarIconsWhenExpanded() {
        if (mLaunchingNotification) {
            return mHideIconsDuringNotificationLaunch;
        }
        if (mHeadsUpAppearanceController != null
                && mHeadsUpAppearanceController.shouldBeVisible()) {
            return false;
        }
        return !isFullWidth() || !mShowIconsWhenExpanded;
    }

    private final FragmentListener mFragmentListener = new FragmentListener() {
        @Override
        public void onFragmentViewCreated(String tag, Fragment fragment) {
            mQs = (QS) fragment;
            mQs.setPanelView(NotificationPanelView.this);
            mQs.setExpandClickListener(NotificationPanelView.this);
            mQs.setHeaderClickable(mQsExpansionEnabled);
            updateQSPulseExpansion();
            mQs.setOverscrolling(mStackScrollerOverscrolling);

            // recompute internal state when qspanel height changes
            mQs.getView().addOnLayoutChangeListener(
                    (v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom) -> {
                        final int height = bottom - top;
                        final int oldHeight = oldBottom - oldTop;
                        if (height != oldHeight) {
                            onQsHeightChanged();
                        }
                    });
            mNotificationStackScroller.setQsContainer((ViewGroup) mQs.getView());
            if (mQs instanceof QSFragment) {
                mKeyguardStatusBar.setQSPanel(((QSFragment) mQs).getQsPanel());
            }
            updateQsExpansion();
        }

        @Override
        public void onFragmentViewDestroyed(String tag, Fragment fragment) {
            // Manual handling of fragment lifecycle is only required because this bridges
            // non-fragment and fragment code. Once we are using a fragment for the notification
            // panel, mQs will not need to be null cause it will be tied to the same lifecycle.
            if (fragment == mQs) {
                mQs = null;
            }
        }
    };

    @Override
    public void setTouchAndAnimationDisabled(boolean disabled) {
        super.setTouchAndAnimationDisabled(disabled);
        if (disabled && mAffordanceHelper.isSwipingInProgress() && !mIsLaunchTransitionRunning) {
            mAffordanceHelper.reset(false /* animate */);
        }
        mNotificationStackScroller.setAnimationsEnabled(!disabled);
    }

    /**
     * Sets the dozing state.
     *
     * @param dozing {@code true} when dozing.
     * @param animate if transition should be animated.
     * @param wakeUpTouchLocation touch event location - if woken up by SLPI sensor.
     */
    public void setDozing(boolean dozing, boolean animate, PointF wakeUpTouchLocation) {
        if (dozing == mDozing) return;
        mDozing = dozing;
        mNotificationStackScroller.setDozing(mDozing, animate, wakeUpTouchLocation);
        mKeyguardBottomArea.setDozing(mDozing, animate);

        if (dozing) {
            mBottomAreaShadeAlphaAnimator.cancel();
        }

        if (mBarState == StatusBarState.KEYGUARD
                || mBarState == StatusBarState.SHADE_LOCKED) {
            updateDozingVisibilities(animate);
        }

        final float dozeAmount = dozing ? 1 : 0;
        mStatusBarStateController.setDozeAmount(dozeAmount, animate);
    }

    @Override
    public void onDozeAmountChanged(float linearAmount, float amount) {
        mInterpolatedDarkAmount = amount;
        mLinearDarkAmount = linearAmount;
        mKeyguardStatusView.setDarkAmount(mInterpolatedDarkAmount);
        mKeyguardBottomArea.setDarkAmount(mInterpolatedDarkAmount);
        positionClockAndNotifications();
    }

    public void setPulsing(boolean pulsing) {
        mPulsing = pulsing;
        final boolean animatePulse = !mDozeParameters.getDisplayNeedsBlanking()
                && mDozeParameters.getAlwaysOn();
        if (animatePulse) {
            mAnimateNextPositionUpdate = true;
        }
        // Do not animate the clock when waking up from a pulse.
        // The height callback will take care of pushing the clock to the right position.
        if (!mPulsing && !mDozing) {
            mAnimateNextPositionUpdate = false;
        }
        mNotificationStackScroller.setPulsing(pulsing, animatePulse);
        mKeyguardStatusView.setPulsing(pulsing);
    }

    public void setAmbientIndicationBottomPadding(int ambientIndicationBottomPadding) {
        if (mAmbientIndicationBottomPadding != ambientIndicationBottomPadding) {
            mAmbientIndicationBottomPadding = ambientIndicationBottomPadding;
            mStatusBar.updateKeyguardMaxNotifications();
        }
    }

    public void dozeTimeTick() {
        mKeyguardBottomArea.dozeTimeTick();
        mKeyguardStatusView.dozeTimeTick();
        if (mInterpolatedDarkAmount > 0) {
            positionClockAndNotifications();
        }
    }

    public void setStatusAccessibilityImportance(int mode) {
        mKeyguardStatusView.setImportantForAccessibility(mode);
    }

    /**
     * TODO: this should be removed.
     * It's not correct to pass this view forward because other classes will end up adding
     * children to it. Theme will be out of sync.
     *
     * @return bottom area view
     */
    public KeyguardBottomAreaView getKeyguardBottomAreaView() {
        return mKeyguardBottomArea;
    }

    public void setUserSetupComplete(boolean userSetupComplete) {
        mUserSetupComplete = userSetupComplete;
        mKeyguardBottomArea.setUserSetupComplete(userSetupComplete);
    }

    public void applyExpandAnimationParams(ExpandAnimationParameters params) {
        mExpandOffset = params != null ? params.getTopChange() : 0;
        updateQsExpansion();
        if (params != null) {
            boolean hideIcons = params.getProgress(
                    ActivityLaunchAnimator.ANIMATION_DELAY_ICON_FADE_IN, 100) == 0.0f;
            if (hideIcons != mHideIconsDuringNotificationLaunch) {
                mHideIconsDuringNotificationLaunch = hideIcons;
                if (!hideIcons) {
                    mCommandQueue.recomputeDisableFlags(mDisplayId, true /* animate */);
                }
            }
        }
    }

    public void addTrackingHeadsUpListener(Consumer<ExpandableNotificationRow> listener) {
        mTrackingHeadsUpListeners.add(listener);
    }

    public void removeTrackingHeadsUpListener(Consumer<ExpandableNotificationRow> listener) {
        mTrackingHeadsUpListeners.remove(listener);
    }

    public void addVerticalTranslationListener(Runnable verticalTranslationListener) {
        mVerticalTranslationListener.add(verticalTranslationListener);
    }

    public void removeVerticalTranslationListener(Runnable verticalTranslationListener) {
        mVerticalTranslationListener.remove(verticalTranslationListener);
    }

    public void setHeadsUpAppearanceController(
            HeadsUpAppearanceController headsUpAppearanceController) {
        mHeadsUpAppearanceController = headsUpAppearanceController;
    }

    /**
     * Starts the animation before we dismiss Keyguard, i.e. an disappearing animation on the
     * security view of the bouncer.
     */
    public void onBouncerPreHideAnimation() {
        setKeyguardStatusViewVisibility(mBarState, true /* keyguardFadingAway */,
                false /* goingToFullShade */);
    }

    /**
     * Do not let the user drag the shade up and down for the current touch session.
     * This is necessary to avoid shade expansion while/after the bouncer is dismissed.
     */
    public void blockExpansionForCurrentTouch() {
        mBlockingExpansionForCurrentTouch = mTracking;
    }

    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        super.dump(fd, pw, args);
        pw.println("    gestureExclusionRect: " + calculateGestureExclusionRect());
        if (mKeyguardStatusBar != null) {
            mKeyguardStatusBar.dump(fd, pw, args);
        }
        if (mKeyguardStatusView != null) {
            mKeyguardStatusView.dump(fd, pw, args);
        }
    }

    public boolean hasActiveClearableNotifications() {
        return mNotificationStackScroller.hasActiveClearableNotifications(ROWS_ALL);
    }

    @Override
    public void onZenChanged(int zen) {
        updateShowEmptyShadeView();
    }

    private void updateShowEmptyShadeView() {
        boolean showEmptyShadeView =
                mBarState != StatusBarState.KEYGUARD && !mEntryManager.hasActiveNotifications();
        showEmptyShadeView(showEmptyShadeView);
    }

    public RemoteInputController.Delegate createRemoteInputDelegate() {
        return mNotificationStackScroller.createDelegate();
    }

    public void updateNotificationViews() {
        mNotificationStackScroller.updateSectionBoundaries();
        mNotificationStackScroller.updateSpeedBumpIndex();
        mNotificationStackScroller.updateFooter();
        updateShowEmptyShadeView();
        mNotificationStackScroller.updateIconAreaViews();
    }

    public void onUpdateRowStates() {
        mNotificationStackScroller.onUpdateRowStates();
    }

    public boolean hasPulsingNotifications() {
        return mNotificationStackScroller.hasPulsingNotifications();
    }

    public ActivatableNotificationView getActivatedChild() {
        return mNotificationStackScroller.getActivatedChild();
    }

    public void setActivatedChild(ActivatableNotificationView o) {
        mNotificationStackScroller.setActivatedChild(o);
    }

    public void runAfterAnimationFinished(Runnable r) {
        mNotificationStackScroller.runAfterAnimationFinished(r);
    }

    public void setScrollingEnabled(boolean b) {
        mNotificationStackScroller.setScrollingEnabled(b);
    }

    public void initDependencies(StatusBar statusBar, NotificationGroupManager groupManager,
            NotificationShelf notificationShelf,
            HeadsUpManagerPhone headsUpManager,
            NotificationIconAreaController notificationIconAreaController,
            ScrimController scrimController) {
        setStatusBar(statusBar);
        setGroupManager(mGroupManager);
        mNotificationStackScroller.setNotificationPanel(this);
        mNotificationStackScroller.setIconAreaController(notificationIconAreaController);
        mNotificationStackScroller.setStatusBar(statusBar);
        mNotificationStackScroller.setGroupManager(groupManager);
        mNotificationStackScroller.setShelf(notificationShelf);
        mNotificationStackScroller.setScrimController(scrimController);
        updateShowEmptyShadeView();
    }

    public void showTransientIndication(int id) {
        mKeyguardIndicationController.showTransientIndication(id);
    }

    @Override
    public void onDynamicPrivacyChanged() {
        // Do not request animation when pulsing or waking up, otherwise the clock wiill be out
        // of sync with the notification panel.
        if (mLinearDarkAmount != 0) {
            return;
        }
        mAnimateNextPositionUpdate = true;
    }

    public void setOnReinflationListener(Runnable onReinflationListener) {
        mOnReinflationListener = onReinflationListener;
    }

    public static boolean isQsSplitEnabled() {
        return DeviceConfig.getBoolean(DeviceConfig.NAMESPACE_SYSTEMUI,
                SystemUiDeviceConfigFlags.QS_SPLIT_ENABLED, false);
    }
}