| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| |
| package com.android.systemui.statusbar.stack; |
| |
| import android.content.Context; |
| import android.content.res.Configuration; |
| |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| |
| import android.util.AttributeSet; |
| import android.util.Log; |
| |
| import android.view.MotionEvent; |
| import android.view.VelocityTracker; |
| import android.view.View; |
| import android.view.ViewConfiguration; |
| import android.view.ViewGroup; |
| import android.view.ViewTreeObserver; |
| import android.view.animation.AnimationUtils; |
| import android.widget.OverScroller; |
| |
| import com.android.systemui.ExpandHelper; |
| import com.android.systemui.R; |
| import com.android.systemui.SwipeHelper; |
| import com.android.systemui.statusbar.ExpandableNotificationRow; |
| import com.android.systemui.statusbar.ExpandableView; |
| import com.android.systemui.statusbar.stack.StackScrollState.ViewState; |
| import com.android.systemui.statusbar.policy.ScrollAdapter; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * A layout which handles a dynamic amount of notifications and presents them in a scrollable stack. |
| */ |
| public class NotificationStackScrollLayout extends ViewGroup |
| implements SwipeHelper.Callback, ExpandHelper.Callback, ScrollAdapter, |
| ExpandableView.OnHeightChangedListener { |
| |
| private static final String TAG = "NotificationStackScrollLayout"; |
| private static final boolean DEBUG = false; |
| |
| /** |
| * Sentinel value for no current active pointer. Used by {@link #mActivePointerId}. |
| */ |
| private static final int INVALID_POINTER = -1; |
| |
| private SwipeHelper mSwipeHelper; |
| private boolean mSwipingInProgress; |
| private int mCurrentStackHeight = Integer.MAX_VALUE; |
| private int mOwnScrollY; |
| private int mMaxLayoutHeight; |
| |
| private VelocityTracker mVelocityTracker; |
| private OverScroller mScroller; |
| private int mTouchSlop; |
| private int mMinimumVelocity; |
| private int mMaximumVelocity; |
| private int mOverscrollDistance; |
| private int mOverflingDistance; |
| private boolean mIsBeingDragged; |
| private int mLastMotionY; |
| private int mActivePointerId; |
| |
| private int mSidePaddings; |
| private Paint mDebugPaint; |
| private int mContentHeight; |
| private int mCollapsedSize; |
| private int mBottomStackPeekSize; |
| private int mEmptyMarginBottom; |
| private int mPaddingBetweenElements; |
| private int mTopPadding; |
| private boolean mListenForHeightChanges = true; |
| |
| /** |
| * The algorithm which calculates the properties for our children |
| */ |
| private StackScrollAlgorithm mStackScrollAlgorithm; |
| |
| /** |
| * The current State this Layout is in |
| */ |
| private StackScrollState mCurrentStackScrollState = new StackScrollState(this); |
| private ArrayList<View> mChildrenToAddAnimated = new ArrayList<View>(); |
| private ArrayList<View> mChildrenToRemoveAnimated = new ArrayList<View>(); |
| private ArrayList<ChildHierarchyChangeEvent> mAnimationEvents |
| = new ArrayList<ChildHierarchyChangeEvent>(); |
| private ArrayList<View> mSwipedOutViews = new ArrayList<View>(); |
| private final StackStateAnimator mStateAnimator = new StackStateAnimator(this); |
| |
| private OnChildLocationsChangedListener mListener; |
| private ExpandableView.OnHeightChangedListener mOnHeightChangedListener; |
| private boolean mChildHierarchyDirty; |
| private boolean mIsExpanded = true; |
| private ViewTreeObserver.OnPreDrawListener mAfterLayoutPreDrawListener |
| = new ViewTreeObserver.OnPreDrawListener() { |
| @Override |
| public boolean onPreDraw() { |
| updateScrollPositionIfNecessary(); |
| updateChildren(); |
| getViewTreeObserver().removeOnPreDrawListener(this); |
| return true; |
| } |
| }; |
| |
| public NotificationStackScrollLayout(Context context) { |
| this(context, null); |
| } |
| |
| public NotificationStackScrollLayout(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| public NotificationStackScrollLayout(Context context, AttributeSet attrs, int defStyleAttr) { |
| this(context, attrs, defStyleAttr, 0); |
| } |
| |
| public NotificationStackScrollLayout(Context context, AttributeSet attrs, int defStyleAttr, |
| int defStyleRes) { |
| super(context, attrs, defStyleAttr, defStyleRes); |
| initView(context); |
| if (DEBUG) { |
| setWillNotDraw(false); |
| mDebugPaint = new Paint(); |
| mDebugPaint.setColor(0xffff0000); |
| mDebugPaint.setStrokeWidth(2); |
| mDebugPaint.setStyle(Paint.Style.STROKE); |
| } |
| } |
| |
| @Override |
| protected void onDraw(Canvas canvas) { |
| if (DEBUG) { |
| int y = mCollapsedSize; |
| canvas.drawLine(0, y, getWidth(), y, mDebugPaint); |
| y = (int) (getLayoutHeight() - mBottomStackPeekSize - mCollapsedSize); |
| canvas.drawLine(0, y, getWidth(), y, mDebugPaint); |
| y = (int) getLayoutHeight(); |
| canvas.drawLine(0, y, getWidth(), y, mDebugPaint); |
| } |
| } |
| |
| private void initView(Context context) { |
| mScroller = new OverScroller(getContext()); |
| setFocusable(true); |
| setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); |
| final ViewConfiguration configuration = ViewConfiguration.get(context); |
| mTouchSlop = configuration.getScaledTouchSlop(); |
| mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); |
| mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); |
| mOverscrollDistance = configuration.getScaledOverscrollDistance(); |
| mOverflingDistance = configuration.getScaledOverflingDistance(); |
| float densityScale = getResources().getDisplayMetrics().density; |
| float pagingTouchSlop = ViewConfiguration.get(getContext()).getScaledPagingTouchSlop(); |
| mSwipeHelper = new SwipeHelper(SwipeHelper.X, this, densityScale, pagingTouchSlop); |
| |
| mSidePaddings = context.getResources() |
| .getDimensionPixelSize(R.dimen.notification_side_padding); |
| mCollapsedSize = context.getResources() |
| .getDimensionPixelSize(R.dimen.notification_min_height); |
| mBottomStackPeekSize = context.getResources() |
| .getDimensionPixelSize(R.dimen.bottom_stack_peek_amount); |
| mEmptyMarginBottom = context.getResources().getDimensionPixelSize( |
| R.dimen.notification_stack_margin_bottom); |
| mPaddingBetweenElements = context.getResources() |
| .getDimensionPixelSize(R.dimen.notification_padding); |
| mStackScrollAlgorithm = new StackScrollAlgorithm(context); |
| } |
| |
| @Override |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| int mode = MeasureSpec.getMode(widthMeasureSpec); |
| int size = MeasureSpec.getSize(widthMeasureSpec); |
| int childMeasureSpec = MeasureSpec.makeMeasureSpec(size - 2 * mSidePaddings, mode); |
| measureChildren(childMeasureSpec, heightMeasureSpec); |
| } |
| |
| @Override |
| protected void onLayout(boolean changed, int l, int t, int r, int b) { |
| |
| // we layout all our children centered on the top |
| float centerX = getWidth() / 2.0f; |
| for (int i = 0; i < getChildCount(); i++) { |
| View child = getChildAt(i); |
| float width = child.getMeasuredWidth(); |
| float height = child.getMeasuredHeight(); |
| child.layout((int) (centerX - width / 2.0f), |
| 0, |
| (int) (centerX + width / 2.0f), |
| (int) height); |
| } |
| setMaxLayoutHeight(getHeight() - mEmptyMarginBottom); |
| updateContentHeight(); |
| getViewTreeObserver().addOnPreDrawListener(mAfterLayoutPreDrawListener); |
| } |
| |
| public void setChildLocationsChangedListener(OnChildLocationsChangedListener listener) { |
| mListener = listener; |
| } |
| |
| /** |
| * Returns the location the given child is currently rendered at. |
| * |
| * @param child the child to get the location for |
| * @return one of {@link ViewState}'s <code>LOCATION_*</code> constants |
| */ |
| public int getChildLocation(View child) { |
| ViewState childViewState = mCurrentStackScrollState.getViewStateForView(child); |
| if (childViewState == null) { |
| return ViewState.LOCATION_UNKNOWN; |
| } |
| return childViewState.location; |
| } |
| |
| private void setMaxLayoutHeight(int maxLayoutHeight) { |
| mMaxLayoutHeight = maxLayoutHeight; |
| updateAlgorithmHeightAndPadding(); |
| } |
| |
| private void updateAlgorithmHeightAndPadding() { |
| mStackScrollAlgorithm.setLayoutHeight(getLayoutHeight()); |
| mStackScrollAlgorithm.setTopPadding(mTopPadding); |
| } |
| |
| /** |
| * @return whether the height of the layout needs to be adapted, in order to ensure that the |
| * last child is not in the bottom stack. |
| */ |
| private boolean needsHeightAdaption() { |
| View lastChild = getLastChildNotGone(); |
| View firstChild = getFirstChildNotGone(); |
| boolean isLastChildExpanded = isViewExpanded(lastChild); |
| return isLastChildExpanded && lastChild != firstChild; |
| } |
| |
| private boolean isViewExpanded(View view) { |
| if (view != null) { |
| ExpandableView expandView = (ExpandableView) view; |
| return expandView.getActualHeight() > mCollapsedSize; |
| } |
| return false; |
| } |
| |
| /** |
| * Updates the children views according to the stack scroll algorithm. Call this whenever |
| * modifications to {@link #mOwnScrollY} are performed to reflect it in the view layout. |
| */ |
| private void updateChildren() { |
| mCurrentStackScrollState.setScrollY(mOwnScrollY); |
| mStackScrollAlgorithm.getStackScrollState(mCurrentStackScrollState); |
| if (!isCurrentlyAnimating() && !mChildHierarchyDirty) { |
| applyCurrentState(); |
| if (mListener != null) { |
| mListener.onChildLocationsChanged(this); |
| } |
| } else { |
| startAnimationToState(mCurrentStackScrollState); |
| } |
| } |
| |
| private boolean isCurrentlyAnimating() { |
| return mStateAnimator.isRunning(); |
| } |
| |
| private void updateScrollPositionIfNecessary() { |
| int scrollRange = getScrollRange(); |
| if (scrollRange < mOwnScrollY) { |
| mOwnScrollY = scrollRange; |
| } |
| } |
| |
| public int getTopPadding() { |
| return mTopPadding; |
| } |
| |
| public void setTopPadding(int topPadding) { |
| if (mTopPadding != topPadding) { |
| mTopPadding = topPadding; |
| updateAlgorithmHeightAndPadding(); |
| updateContentHeight(); |
| updateChildren(); |
| } |
| } |
| |
| /** |
| * Update the height of the stack to a new height. |
| * |
| * @param height the new height of the stack |
| */ |
| public void setStackHeight(float height) { |
| setIsExpanded(height > 0.0f); |
| int newStackHeight = (int) height; |
| int itemHeight = getItemHeight(); |
| int bottomStackPeekSize = mBottomStackPeekSize; |
| int minStackHeight = itemHeight + bottomStackPeekSize; |
| int stackHeight; |
| if (newStackHeight - mTopPadding >= minStackHeight) { |
| setTranslationY(0); |
| stackHeight = newStackHeight; |
| } else { |
| |
| // We did not reach the position yet where we actually start growing, |
| // so we translate the stack upwards. |
| int translationY = (newStackHeight - minStackHeight); |
| // A slight parallax effect is introduced in order for the stack to catch up with |
| // the top card. |
| float partiallyThere = (float) (newStackHeight - mTopPadding) / minStackHeight; |
| partiallyThere = Math.max(0, partiallyThere); |
| translationY += (1 - partiallyThere) * bottomStackPeekSize; |
| setTranslationY(translationY - mTopPadding); |
| stackHeight = (int) (height - (translationY - mTopPadding)); |
| } |
| if (stackHeight != mCurrentStackHeight) { |
| mCurrentStackHeight = stackHeight; |
| updateAlgorithmHeightAndPadding(); |
| updateChildren(); |
| } |
| } |
| |
| /** |
| * Get the current height of the view. This is at most the msize of the view given by a the |
| * layout but it can also be made smaller by setting {@link #mCurrentStackHeight} |
| * |
| * @return either the layout height or the externally defined height, whichever is smaller |
| */ |
| private int getLayoutHeight() { |
| return Math.min(mMaxLayoutHeight, mCurrentStackHeight); |
| } |
| |
| public int getItemHeight() { |
| return mCollapsedSize; |
| } |
| |
| public int getBottomStackPeekSize() { |
| return mBottomStackPeekSize; |
| } |
| |
| public void setLongPressListener(View.OnLongClickListener listener) { |
| mSwipeHelper.setLongPressListener(listener); |
| } |
| |
| public void onChildDismissed(View v) { |
| if (DEBUG) Log.v(TAG, "onChildDismissed: " + v); |
| final View veto = v.findViewById(R.id.veto); |
| if (veto != null && veto.getVisibility() != View.GONE) { |
| veto.performClick(); |
| } |
| setSwipingInProgress(false); |
| mSwipedOutViews.add(v); |
| } |
| |
| public void onBeginDrag(View v) { |
| setSwipingInProgress(true); |
| } |
| |
| public void onDragCancelled(View v) { |
| setSwipingInProgress(false); |
| } |
| |
| public View getChildAtPosition(MotionEvent ev) { |
| return getChildAtPosition(ev.getX(), ev.getY()); |
| } |
| |
| public View getChildAtRawPosition(float touchX, float touchY) { |
| int[] location = new int[2]; |
| getLocationOnScreen(location); |
| return getChildAtPosition(touchX - location[0],touchY - location[1]); |
| } |
| |
| public View getChildAtPosition(float touchX, float touchY) { |
| // find the view under the pointer, accounting for GONE views |
| final int count = getChildCount(); |
| for (int childIdx = 0; childIdx < count; childIdx++) { |
| ExpandableView slidingChild = (ExpandableView) getChildAt(childIdx); |
| if (slidingChild.getVisibility() == GONE) { |
| continue; |
| } |
| float top = slidingChild.getTranslationY(); |
| float bottom = top + slidingChild.getActualHeight(); |
| int left = slidingChild.getLeft(); |
| int right = slidingChild.getRight(); |
| |
| if (touchY >= top && touchY <= bottom && touchX >= left && touchX <= right) { |
| return slidingChild; |
| } |
| } |
| return null; |
| } |
| |
| public boolean canChildBeExpanded(View v) { |
| return v instanceof ExpandableNotificationRow |
| && ((ExpandableNotificationRow) v).isExpandable(); |
| } |
| |
| public void setUserExpandedChild(View v, boolean userExpanded) { |
| if (v instanceof ExpandableNotificationRow) { |
| ((ExpandableNotificationRow) v).setUserExpanded(userExpanded); |
| } |
| } |
| |
| public void setUserLockedChild(View v, boolean userLocked) { |
| if (v instanceof ExpandableNotificationRow) { |
| ((ExpandableNotificationRow) v).setUserLocked(userLocked); |
| } |
| } |
| |
| public View getChildContentView(View v) { |
| return v; |
| } |
| |
| public boolean canChildBeDismissed(View v) { |
| final View veto = v.findViewById(R.id.veto); |
| return (veto != null && veto.getVisibility() != View.GONE); |
| } |
| |
| private void setSwipingInProgress(boolean isSwiped) { |
| mSwipingInProgress = isSwiped; |
| if(isSwiped) { |
| requestDisallowInterceptTouchEvent(true); |
| } |
| } |
| |
| @Override |
| protected void onConfigurationChanged(Configuration newConfig) { |
| super.onConfigurationChanged(newConfig); |
| float densityScale = getResources().getDisplayMetrics().density; |
| mSwipeHelper.setDensityScale(densityScale); |
| float pagingTouchSlop = ViewConfiguration.get(getContext()).getScaledPagingTouchSlop(); |
| mSwipeHelper.setPagingTouchSlop(pagingTouchSlop); |
| initView(getContext()); |
| } |
| |
| public void dismissRowAnimated(View child, int vel) { |
| mSwipeHelper.dismissChild(child, vel); |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent ev) { |
| boolean scrollerWantsIt = false; |
| if (!mSwipingInProgress) { |
| scrollerWantsIt = onScrollTouch(ev); |
| } |
| boolean horizontalSwipeWantsIt = false; |
| if (!mIsBeingDragged) { |
| horizontalSwipeWantsIt = mSwipeHelper.onTouchEvent(ev); |
| } |
| return horizontalSwipeWantsIt || scrollerWantsIt || super.onTouchEvent(ev); |
| } |
| |
| private boolean onScrollTouch(MotionEvent ev) { |
| initVelocityTrackerIfNotExists(); |
| mVelocityTracker.addMovement(ev); |
| |
| final int action = ev.getAction(); |
| |
| switch (action & MotionEvent.ACTION_MASK) { |
| case MotionEvent.ACTION_DOWN: { |
| if (getChildCount() == 0) { |
| return false; |
| } |
| boolean isBeingDragged = !mScroller.isFinished(); |
| setIsBeingDragged(isBeingDragged); |
| |
| /* |
| * If being flinged and user touches, stop the fling. isFinished |
| * will be false if being flinged. |
| */ |
| if (!mScroller.isFinished()) { |
| mScroller.abortAnimation(); |
| } |
| |
| // Remember where the motion event started |
| mLastMotionY = (int) ev.getY(); |
| mActivePointerId = ev.getPointerId(0); |
| break; |
| } |
| case MotionEvent.ACTION_MOVE: |
| final int activePointerIndex = ev.findPointerIndex(mActivePointerId); |
| if (activePointerIndex == -1) { |
| Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); |
| break; |
| } |
| |
| final int y = (int) ev.getY(activePointerIndex); |
| int deltaY = mLastMotionY - y; |
| if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) { |
| setIsBeingDragged(true); |
| if (deltaY > 0) { |
| deltaY -= mTouchSlop; |
| } else { |
| deltaY += mTouchSlop; |
| } |
| } |
| if (mIsBeingDragged) { |
| // Scroll to follow the motion event |
| mLastMotionY = y; |
| |
| final int oldX = mScrollX; |
| final int oldY = mOwnScrollY; |
| final int range = getScrollRange(); |
| final int overscrollMode = getOverScrollMode(); |
| final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || |
| (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); |
| |
| // Calling overScrollBy will call onOverScrolled, which |
| // calls onScrollChanged if applicable. |
| if (overScrollBy(0, deltaY, 0, mOwnScrollY, |
| 0, range, 0, mOverscrollDistance, true)) { |
| // Break our velocity if we hit a scroll barrier. |
| mVelocityTracker.clear(); |
| } |
| // TODO: Overscroll |
| // if (canOverscroll) { |
| // final int pulledToY = oldY + deltaY; |
| // if (pulledToY < 0) { |
| // mEdgeGlowTop.onPull((float) deltaY / getHeight()); |
| // if (!mEdgeGlowBottom.isFinished()) { |
| // mEdgeGlowBottom.onRelease(); |
| // } |
| // } else if (pulledToY > range) { |
| // mEdgeGlowBottom.onPull((float) deltaY / getHeight()); |
| // if (!mEdgeGlowTop.isFinished()) { |
| // mEdgeGlowTop.onRelease(); |
| // } |
| // } |
| // if (mEdgeGlowTop != null |
| // && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())){ |
| // postInvalidateOnAnimation(); |
| // } |
| // } |
| } |
| break; |
| case MotionEvent.ACTION_UP: |
| if (mIsBeingDragged) { |
| final VelocityTracker velocityTracker = mVelocityTracker; |
| velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); |
| int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); |
| |
| if (getChildCount() > 0) { |
| if ((Math.abs(initialVelocity) > mMinimumVelocity)) { |
| fling(-initialVelocity); |
| } else { |
| if (mScroller.springBack(mScrollX, mOwnScrollY, 0, 0, 0, |
| getScrollRange())) { |
| postInvalidateOnAnimation(); |
| } |
| } |
| } |
| |
| mActivePointerId = INVALID_POINTER; |
| endDrag(); |
| } |
| break; |
| case MotionEvent.ACTION_CANCEL: |
| if (mIsBeingDragged && getChildCount() > 0) { |
| if (mScroller.springBack(mScrollX, mOwnScrollY, 0, 0, 0, getScrollRange())) { |
| postInvalidateOnAnimation(); |
| } |
| mActivePointerId = INVALID_POINTER; |
| endDrag(); |
| } |
| break; |
| case MotionEvent.ACTION_POINTER_DOWN: { |
| final int index = ev.getActionIndex(); |
| mLastMotionY = (int) ev.getY(index); |
| mActivePointerId = ev.getPointerId(index); |
| break; |
| } |
| case MotionEvent.ACTION_POINTER_UP: |
| onSecondaryPointerUp(ev); |
| mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); |
| break; |
| } |
| return true; |
| } |
| |
| private void onSecondaryPointerUp(MotionEvent ev) { |
| final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> |
| MotionEvent.ACTION_POINTER_INDEX_SHIFT; |
| final int pointerId = ev.getPointerId(pointerIndex); |
| if (pointerId == mActivePointerId) { |
| // This was our active pointer going up. Choose a new |
| // active pointer and adjust accordingly. |
| // TODO: Make this decision more intelligent. |
| final int newPointerIndex = pointerIndex == 0 ? 1 : 0; |
| mLastMotionY = (int) ev.getY(newPointerIndex); |
| mActivePointerId = ev.getPointerId(newPointerIndex); |
| if (mVelocityTracker != null) { |
| mVelocityTracker.clear(); |
| } |
| } |
| } |
| |
| private void initVelocityTrackerIfNotExists() { |
| if (mVelocityTracker == null) { |
| mVelocityTracker = VelocityTracker.obtain(); |
| } |
| } |
| |
| private void recycleVelocityTracker() { |
| if (mVelocityTracker != null) { |
| mVelocityTracker.recycle(); |
| mVelocityTracker = null; |
| } |
| } |
| |
| private void initOrResetVelocityTracker() { |
| if (mVelocityTracker == null) { |
| mVelocityTracker = VelocityTracker.obtain(); |
| } else { |
| mVelocityTracker.clear(); |
| } |
| } |
| |
| @Override |
| public void computeScroll() { |
| if (mScroller.computeScrollOffset()) { |
| // This is called at drawing time by ViewGroup. |
| int oldX = mScrollX; |
| int oldY = mOwnScrollY; |
| int x = mScroller.getCurrX(); |
| int y = mScroller.getCurrY(); |
| |
| if (oldX != x || oldY != y) { |
| final int range = getScrollRange(); |
| final int overscrollMode = getOverScrollMode(); |
| final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || |
| (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); |
| |
| overScrollBy(x - oldX, y - oldY, oldX, oldY, 0, range, |
| 0, mOverflingDistance, false); |
| onScrollChanged(mScrollX, mOwnScrollY, oldX, oldY); |
| |
| if (canOverscroll) { |
| // TODO: Overscroll |
| // if (y < 0 && oldY >= 0) { |
| // mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); |
| // } else if (y > range && oldY <= range) { |
| // mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); |
| // } |
| } |
| updateChildren(); |
| } |
| |
| // Keep on drawing until the animation has finished. |
| postInvalidateOnAnimation(); |
| } |
| } |
| |
| public void customScrollBy(int y) { |
| mOwnScrollY += y; |
| updateChildren(); |
| } |
| |
| public void customScrollTo(int y) { |
| mOwnScrollY = y; |
| updateChildren(); |
| } |
| |
| @Override |
| protected void onOverScrolled(int scrollX, int scrollY, |
| boolean clampedX, boolean clampedY) { |
| // Treat animating scrolls differently; see #computeScroll() for why. |
| if (!mScroller.isFinished()) { |
| final int oldX = mScrollX; |
| final int oldY = mOwnScrollY; |
| mScrollX = scrollX; |
| mOwnScrollY = scrollY; |
| invalidateParentIfNeeded(); |
| onScrollChanged(mScrollX, mOwnScrollY, oldX, oldY); |
| if (clampedY) { |
| mScroller.springBack(mScrollX, mOwnScrollY, 0, 0, 0, getScrollRange()); |
| } |
| updateChildren(); |
| } else { |
| customScrollTo(scrollY); |
| scrollTo(scrollX, mScrollY); |
| } |
| } |
| |
| private int getScrollRange() { |
| int scrollRange = 0; |
| ExpandableView firstChild = (ExpandableView) getFirstChildNotGone(); |
| if (firstChild != null) { |
| int contentHeight = getContentHeight(); |
| int firstChildMaxExpandHeight = getMaxExpandHeight(firstChild); |
| |
| scrollRange = Math.max(0, contentHeight - mMaxLayoutHeight + mBottomStackPeekSize); |
| if (scrollRange > 0) { |
| View lastChild = getLastChildNotGone(); |
| if (isViewExpanded(lastChild)) { |
| // last child is expanded, so we have to ensure that it can exit the |
| // bottom stack |
| scrollRange += mCollapsedSize + mPaddingBetweenElements; |
| } |
| // We want to at least be able collapse the first item and not ending in a weird |
| // end state. |
| scrollRange = Math.max(scrollRange, firstChildMaxExpandHeight - mCollapsedSize); |
| } |
| } |
| return scrollRange; |
| } |
| |
| /** |
| * @return the first child which has visibility unequal to GONE |
| */ |
| private View getFirstChildNotGone() { |
| int childCount = getChildCount(); |
| for (int i = 0; i < childCount; i++) { |
| View child = getChildAt(i); |
| if (child.getVisibility() != View.GONE) { |
| return child; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * @return the last child which has visibility unequal to GONE |
| */ |
| private View getLastChildNotGone() { |
| int childCount = getChildCount(); |
| for (int i = childCount - 1; i >= 0; i--) { |
| View child = getChildAt(i); |
| if (child.getVisibility() != View.GONE) { |
| return child; |
| } |
| } |
| return null; |
| } |
| |
| private int getMaxExpandHeight(View view) { |
| if (view instanceof ExpandableNotificationRow) { |
| ExpandableNotificationRow row = (ExpandableNotificationRow) view; |
| return row.getMaximumAllowedExpandHeight(); |
| } |
| return view.getHeight(); |
| } |
| |
| private int getContentHeight() { |
| return mContentHeight; |
| } |
| |
| private void updateContentHeight() { |
| int height = 0; |
| for (int i = 0; i < getChildCount(); i++) { |
| View child = getChildAt(i); |
| if (child.getVisibility() != View.GONE) { |
| if (height != 0) { |
| // add the padding before this element |
| height += mPaddingBetweenElements; |
| } |
| if (child instanceof ExpandableNotificationRow) { |
| ExpandableNotificationRow row = (ExpandableNotificationRow) child; |
| height += row.getMaximumAllowedExpandHeight(); |
| } else if (child instanceof ExpandableView) { |
| ExpandableView expandableView = (ExpandableView) child; |
| height += expandableView.getActualHeight(); |
| } |
| } |
| } |
| mContentHeight = height + mTopPadding; |
| } |
| |
| /** |
| * Fling the scroll view |
| * |
| * @param velocityY The initial velocity in the Y direction. Positive |
| * numbers mean that the finger/cursor is moving down the screen, |
| * which means we want to scroll towards the top. |
| */ |
| private void fling(int velocityY) { |
| if (getChildCount() > 0) { |
| int height = (int) getLayoutHeight(); |
| int bottom = getContentHeight(); |
| |
| mScroller.fling(mScrollX, mOwnScrollY, 0, velocityY, 0, 0, 0, |
| Math.max(0, bottom - height), 0, height/2); |
| |
| postInvalidateOnAnimation(); |
| } |
| } |
| |
| private void endDrag() { |
| setIsBeingDragged(false); |
| |
| recycleVelocityTracker(); |
| |
| // TODO: Overscroll |
| // if (mEdgeGlowTop != null) { |
| // mEdgeGlowTop.onRelease(); |
| // mEdgeGlowBottom.onRelease(); |
| // } |
| } |
| |
| @Override |
| public boolean onInterceptTouchEvent(MotionEvent ev) { |
| boolean scrollWantsIt = false; |
| if (!mSwipingInProgress) { |
| scrollWantsIt = onInterceptTouchEventScroll(ev); |
| } |
| boolean swipeWantsIt = false; |
| if (!mIsBeingDragged) { |
| swipeWantsIt = mSwipeHelper.onInterceptTouchEvent(ev); |
| } |
| return swipeWantsIt || scrollWantsIt || |
| super.onInterceptTouchEvent(ev); |
| } |
| |
| @Override |
| protected void onViewRemoved(View child) { |
| super.onViewRemoved(child); |
| ((ExpandableView) child).setOnHeightChangedListener(null); |
| mCurrentStackScrollState.removeViewStateForView(child); |
| mStackScrollAlgorithm.notifyChildrenChanged(this); |
| updateScrollStateForRemovedChild(child); |
| if (mIsExpanded) { |
| |
| // Generate Animations |
| mChildrenToRemoveAnimated.add(child); |
| mChildHierarchyDirty = true; |
| } |
| } |
| |
| /** |
| * Updates the scroll position when a child was removed |
| * |
| * @param removedChild the removed child |
| */ |
| private void updateScrollStateForRemovedChild(View removedChild) { |
| int startingPosition = getPositionInLinearLayout(removedChild); |
| int childHeight = removedChild.getHeight() + mPaddingBetweenElements; |
| int endPosition = startingPosition + childHeight; |
| if (endPosition <= mOwnScrollY) { |
| // This child is fully scrolled of the top, so we have to deduct its height from the |
| // scrollPosition |
| mOwnScrollY -= childHeight; |
| } else if (startingPosition < mOwnScrollY) { |
| // This child is currently being scrolled into, set the scroll position to the start of |
| // this child |
| mOwnScrollY = startingPosition; |
| } |
| } |
| |
| private int getPositionInLinearLayout(View requestedChild) { |
| int position = 0; |
| for (int i = 0; i < getChildCount(); i++) { |
| View child = getChildAt(i); |
| if (child == requestedChild) { |
| return position; |
| } |
| if (child.getVisibility() != View.GONE) { |
| position += child.getHeight(); |
| if (i < getChildCount()-1) { |
| position += mPaddingBetweenElements; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| @Override |
| protected void onViewAdded(View child) { |
| super.onViewAdded(child); |
| mStackScrollAlgorithm.notifyChildrenChanged(this); |
| ((ExpandableView) child).setOnHeightChangedListener(this); |
| if (child.getVisibility() != View.GONE) { |
| generateAddAnimation(child); |
| } |
| } |
| |
| public void generateAddAnimation(View child) { |
| if (mIsExpanded) { |
| |
| // Generate Animations |
| mChildrenToAddAnimated.add(child); |
| mChildHierarchyDirty = true; |
| } |
| } |
| |
| /** |
| * Change the position of child to a new location |
| * |
| * @param child the view to change the position for |
| * @param newIndex the new index |
| */ |
| public void changeViewPosition(View child, int newIndex) { |
| if (child != null && child.getParent() == this) { |
| // TODO: handle this |
| } |
| } |
| |
| private void startAnimationToState(StackScrollState finalState) { |
| if (mChildHierarchyDirty) { |
| generateChildHierarchyEvents(); |
| mChildHierarchyDirty = false; |
| } |
| mStateAnimator.startAnimationForEvents(mAnimationEvents, finalState); |
| } |
| |
| private void generateChildHierarchyEvents() { |
| generateChildAdditionEvents(); |
| generateChildRemovalEvents(); |
| mChildHierarchyDirty = false; |
| } |
| |
| private void generateChildRemovalEvents() { |
| for (View child : mChildrenToRemoveAnimated) { |
| boolean childWasSwipedOut = mSwipedOutViews.contains(child); |
| int animationType = childWasSwipedOut |
| ? ChildHierarchyChangeEvent.ANIMATION_TYPE_REMOVE_SWIPED_OUT |
| : ChildHierarchyChangeEvent.ANIMATION_TYPE_REMOVE; |
| mAnimationEvents.add(new ChildHierarchyChangeEvent(child, animationType)); |
| } |
| mSwipedOutViews.clear(); |
| mChildrenToRemoveAnimated.clear(); |
| } |
| |
| private void generateChildAdditionEvents() { |
| for (View child : mChildrenToAddAnimated) { |
| mAnimationEvents.add(new ChildHierarchyChangeEvent(child, |
| ChildHierarchyChangeEvent.ANIMATION_TYPE_ADD)); |
| } |
| mChildrenToAddAnimated.clear(); |
| } |
| |
| private boolean onInterceptTouchEventScroll(MotionEvent ev) { |
| /* |
| * This method JUST determines whether we want to intercept the motion. |
| * If we return true, onMotionEvent will be called and we do the actual |
| * scrolling there. |
| */ |
| |
| /* |
| * Shortcut the most recurring case: the user is in the dragging |
| * state and he is moving his finger. We want to intercept this |
| * motion. |
| */ |
| final int action = ev.getAction(); |
| if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { |
| return true; |
| } |
| |
| /* |
| * Don't try to intercept touch if we can't scroll anyway. |
| */ |
| if (mOwnScrollY == 0 && getScrollRange() == 0) { |
| return false; |
| } |
| |
| switch (action & MotionEvent.ACTION_MASK) { |
| case MotionEvent.ACTION_MOVE: { |
| /* |
| * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check |
| * whether the user has moved far enough from his original down touch. |
| */ |
| |
| /* |
| * Locally do absolute value. mLastMotionY is set to the y value |
| * of the down event. |
| */ |
| final int activePointerId = mActivePointerId; |
| if (activePointerId == INVALID_POINTER) { |
| // If we don't have a valid id, the touch down wasn't on content. |
| break; |
| } |
| |
| final int pointerIndex = ev.findPointerIndex(activePointerId); |
| if (pointerIndex == -1) { |
| Log.e(TAG, "Invalid pointerId=" + activePointerId |
| + " in onInterceptTouchEvent"); |
| break; |
| } |
| |
| final int y = (int) ev.getY(pointerIndex); |
| final int yDiff = Math.abs(y - mLastMotionY); |
| if (yDiff > mTouchSlop) { |
| setIsBeingDragged(true); |
| mLastMotionY = y; |
| initVelocityTrackerIfNotExists(); |
| mVelocityTracker.addMovement(ev); |
| } |
| break; |
| } |
| |
| case MotionEvent.ACTION_DOWN: { |
| final int y = (int) ev.getY(); |
| if (getChildAtPosition(ev.getX(), y) == null) { |
| setIsBeingDragged(false); |
| recycleVelocityTracker(); |
| break; |
| } |
| |
| /* |
| * Remember location of down touch. |
| * ACTION_DOWN always refers to pointer index 0. |
| */ |
| mLastMotionY = y; |
| mActivePointerId = ev.getPointerId(0); |
| |
| initOrResetVelocityTracker(); |
| mVelocityTracker.addMovement(ev); |
| /* |
| * If being flinged and user touches the screen, initiate drag; |
| * otherwise don't. mScroller.isFinished should be false when |
| * being flinged. |
| */ |
| boolean isBeingDragged = !mScroller.isFinished(); |
| setIsBeingDragged(isBeingDragged); |
| break; |
| } |
| |
| case MotionEvent.ACTION_CANCEL: |
| case MotionEvent.ACTION_UP: |
| /* Release the drag */ |
| setIsBeingDragged(false); |
| mActivePointerId = INVALID_POINTER; |
| recycleVelocityTracker(); |
| if (mScroller.springBack(mScrollX, mOwnScrollY, 0, 0, 0, getScrollRange())) { |
| postInvalidateOnAnimation(); |
| } |
| break; |
| case MotionEvent.ACTION_POINTER_UP: |
| onSecondaryPointerUp(ev); |
| break; |
| } |
| |
| /* |
| * The only time we want to intercept motion events is if we are in the |
| * drag mode. |
| */ |
| return mIsBeingDragged; |
| } |
| |
| private void setIsBeingDragged(boolean isDragged) { |
| mIsBeingDragged = isDragged; |
| if (isDragged) { |
| requestDisallowInterceptTouchEvent(true); |
| mSwipeHelper.removeLongPressCallback(); |
| } |
| } |
| |
| @Override |
| public void onWindowFocusChanged(boolean hasWindowFocus) { |
| super.onWindowFocusChanged(hasWindowFocus); |
| if (!hasWindowFocus) { |
| mSwipeHelper.removeLongPressCallback(); |
| } |
| } |
| |
| @Override |
| public boolean isScrolledToTop() { |
| return mOwnScrollY == 0; |
| } |
| |
| @Override |
| public boolean isScrolledToBottom() { |
| return mOwnScrollY >= getScrollRange(); |
| } |
| |
| @Override |
| public View getHostView() { |
| return this; |
| } |
| |
| public int getEmptyBottomMargin() { |
| int emptyMargin = mMaxLayoutHeight - mContentHeight; |
| if (needsHeightAdaption()) { |
| emptyMargin = emptyMargin - mCollapsedSize - mBottomStackPeekSize; |
| } |
| return Math.max(emptyMargin, 0); |
| } |
| |
| public void onExpansionStarted() { |
| mStackScrollAlgorithm.onExpansionStarted(mCurrentStackScrollState); |
| } |
| |
| public void onExpansionStopped() { |
| mStackScrollAlgorithm.onExpansionStopped(); |
| } |
| |
| private void setIsExpanded(boolean isExpanded) { |
| mIsExpanded = isExpanded; |
| mStackScrollAlgorithm.setIsExpanded(isExpanded); |
| if (!isExpanded) { |
| mOwnScrollY = 0; |
| } |
| } |
| |
| @Override |
| public void onHeightChanged(ExpandableView view) { |
| if (mListenForHeightChanges && !isCurrentlyAnimating()) { |
| updateContentHeight(); |
| updateScrollPositionIfNecessary(); |
| if (mOnHeightChangedListener != null) { |
| mOnHeightChangedListener.onHeightChanged(view); |
| } |
| updateChildren(); |
| } |
| } |
| |
| public void setOnHeightChangedListener( |
| ExpandableView.OnHeightChangedListener mOnHeightChangedListener) { |
| this.mOnHeightChangedListener = mOnHeightChangedListener; |
| } |
| |
| public void onChildAnimationFinished() { |
| applyCurrentState(); |
| mAnimationEvents.clear(); |
| } |
| |
| private void applyCurrentState() { |
| mListenForHeightChanges = false; |
| mCurrentStackScrollState.apply(); |
| mListenForHeightChanges = true; |
| } |
| |
| /** |
| * A listener that is notified when some child locations might have changed. |
| */ |
| public interface OnChildLocationsChangedListener { |
| public void onChildLocationsChanged(NotificationStackScrollLayout stackScrollLayout); |
| } |
| |
| static class ChildHierarchyChangeEvent { |
| |
| static int ANIMATION_TYPE_ADD = 1; |
| static int ANIMATION_TYPE_REMOVE = 2; |
| static int ANIMATION_TYPE_REMOVE_SWIPED_OUT = 3; |
| final long eventStartTime; |
| final View changingView; |
| final int animationType; |
| |
| ChildHierarchyChangeEvent(View view, int type) { |
| eventStartTime = AnimationUtils.currentAnimationTimeMillis(); |
| changingView = view; |
| animationType = type; |
| } |
| } |
| |
| } |