Fixing issue with swipe-dismiss animation clobbering home animation.

- Finish all dismiss animations when a dismiss-to-home animation is 
  started, and prevent lingering deferred layout animation requests
  from running as they will be overwritten anyways.

Bug: 28287904
Change-Id: Ie40c66c0f25705b56f6808607d2b7b8ae4e5a112

packages/SystemUI/src/com/android/systemui/recents/views/TaskStackLayoutAlgorithm.java

@@ -416,7 +416,7 @@ public class TaskStackLayoutAlgorithm {
         int prevFocusState = mFocusState;
         mFocusState = focusState;
         updateFrontBackTransforms();
-        if (mCb != null) {
+        if (mCb != null && (prevFocusState != focusState)) {
             mCb.onFocusStateChanged(prevFocusState, focusState);
         }
     }

packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java

@@ -647,7 +647,7 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
      */
     private void relayoutTaskViews(AnimationProps animation, boolean ignoreTaskOverrides) {
         // If we had a deferred animation, cancel that
-        mDeferredTaskViewLayoutAnimation = null;
+        cancelDeferredTaskViewLayoutAnimation();
 
         // Synchronize the current set of TaskViews
         bindVisibleTaskViews(mStackScroller.getStackScroll(),
@@ -739,23 +739,12 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
 
     /**
      * Cancels all {@link TaskView} animations.
-     *
-     * @see #cancelAllTaskViewAnimations(ArraySet<Task.TaskKey>)
      */
     void cancelAllTaskViewAnimations() {
-        cancelAllTaskViewAnimations(mIgnoreTasks);
-    }
-
-    /**
-     * Cancels all {@link TaskView} animations.
-     *
-     * @param ignoreTasksSet The set of tasks to continue running their animations.
-     */
-    void cancelAllTaskViewAnimations(ArraySet<Task.TaskKey> ignoreTasksSet) {
         List<TaskView> taskViews = getTaskViews();
         for (int i = taskViews.size() - 1; i >= 0; i--) {
             final TaskView tv = taskViews.get(i);
-            if (!ignoreTasksSet.contains(tv.getTask().key)) {
+            if (!mIgnoreTasks.contains(tv.getTask().key)) {
                 tv.cancelTransformAnimation();
             }
         }
@@ -1675,8 +1664,10 @@ public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCal
 
     public final void onBusEvent(DismissRecentsToHomeAnimationStarted event) {
         // Stop any scrolling
+        cancelDeferredTaskViewLayoutAnimation();
         mStackScroller.stopScroller();
         mStackScroller.stopBoundScrollAnimation();
+        mTouchHandler.finishAnimations();
 
         // Start the task animations
         mAnimationHelper.startExitToHomeAnimation(event.animated, event.getAnimationTrigger());

packages/SystemUI/src/com/android/systemui/recents/views/TaskStackViewTouchHandler.java

@@ -188,6 +188,18 @@ class TaskStackViewTouchHandler implements SwipeHelper.Callback {
         return true;
     }
 
+    /**
+     * Finishes all scroll-fling and swipe animations currently running.
+     */
+    public void finishAnimations() {
+        Utilities.cancelAnimationWithoutCallbacks(mScrollFlingAnimator);
+        ArrayMap<View, Animator> existingAnimators = new ArrayMap<>(mSwipeHelperAnimations);
+        for (int i = 0; i < existingAnimators.size(); i++) {
+            existingAnimators.get(existingAnimators.keyAt(i)).end();
+        }
+        mSwipeHelperAnimations.clear();
+    }
+
     private boolean handleTouchEvent(MotionEvent ev) {
         // Short circuit if we have no children
         if (mSv.getTaskViews().size() == 0) {
@@ -207,19 +219,11 @@ class TaskStackViewTouchHandler implements SwipeHelper.Callback {
                 mActiveTaskView = findViewAtPoint(mDownX, mDownY);
 
                 // Stop the current scroll if it is still flinging
+                mSv.cancelDeferredTaskViewLayoutAnimation();
                 mScroller.stopScroller();
                 mScroller.stopBoundScrollAnimation();
                 mScroller.resetDeltaScroll();
-                Utilities.cancelAnimationWithoutCallbacks(mScrollFlingAnimator);
+                finishAnimations();
-
-                // Finish any existing task animations from the delete
-                mSv.cancelAllTaskViewAnimations();
-                // Finish any of the swipe helper animations
-                ArrayMap<View, Animator> existingAnimators = new ArrayMap<>(mSwipeHelperAnimations);
-                for (int i = 0; i < existingAnimators.size(); i++) {
-                    existingAnimators.get(existingAnimators.keyAt(i)).end();
-                }
-                mSwipeHelperAnimations.clear();
 
                 // Initialize the velocity tracker
                 initOrResetVelocityTracker();