Call onLauncherTransitionPrepare() and End() from pinch.

This makes the pinch transition more consistent with other transitions.
One immediate benefit of this is that it updates adjacent overview
panels during pinch, regardless of whether they are completely visible.

Previously the adjacent panels' alphas weren't always reset to 0.
Specifically, if you made a small pinch from workspace, which
canceled and went back to workspace, adjacent pages retained a
slightly visible panel.

Bug: 27676309
Change-Id: I7e79fddec31cd649e0811e4524b9a9a501c627f9

src/com/android/launcher3/LauncherStateTransitionAnimation.java

@@ -524,11 +524,13 @@ public class LauncherStateTransitionAnimation {
         // Cancel the current animation
         cancelAnimation();
 
+        boolean multiplePagesVisible = toWorkspaceState.hasMultipleVisiblePages;
+
         playCommonTransitionAnimations(toWorkspaceState, fromWorkspace, null,
                 animated, animated, animation, revealDuration, layerViews);
 
         if (animated) {
-            dispatchOnLauncherTransitionPrepare(fromWorkspace, animated, true);
+            dispatchOnLauncherTransitionPrepare(fromWorkspace, animated, multiplePagesVisible);
 
             final AnimatorSet stateAnimation = animation;
             final Runnable startAnimRunnable = new Runnable() {
@@ -577,7 +579,7 @@ public class LauncherStateTransitionAnimation {
             fromWorkspace.post(startAnimRunnable);
             mCurrentAnimation = animation;
         } else /* if (!animated) */ {
-            dispatchOnLauncherTransitionPrepare(fromWorkspace, animated, true);
+            dispatchOnLauncherTransitionPrepare(fromWorkspace, animated, multiplePagesVisible);
             dispatchOnLauncherTransitionStart(fromWorkspace, animated, true);
             dispatchOnLauncherTransitionEnd(fromWorkspace, animated, true);
 
@@ -615,6 +617,8 @@ public class LauncherStateTransitionAnimation {
         // Cancel the current animation
         cancelAnimation();
 
+        boolean multiplePagesVisible = toWorkspaceState.hasMultipleVisiblePages;
+
         playCommonTransitionAnimations(toWorkspaceState, fromView, toView,
                 animated, initialized, animation, revealDuration, layerViews);
 
@@ -725,8 +729,8 @@ public class LauncherStateTransitionAnimation {
                 }
             }
 
-            dispatchOnLauncherTransitionPrepare(fromView, animated, true);
-            dispatchOnLauncherTransitionPrepare(toView, animated, true);
+            dispatchOnLauncherTransitionPrepare(fromView, animated, multiplePagesVisible);
+            dispatchOnLauncherTransitionPrepare(toView, animated, multiplePagesVisible);
 
             animation.addListener(new AnimatorListenerAdapter() {
                 @Override
@@ -789,10 +793,10 @@ public class LauncherStateTransitionAnimation {
             return animation;
         } else /* if (!(animated && initialized)) */ {
             fromView.setVisibility(View.GONE);
-            dispatchOnLauncherTransitionPrepare(fromView, animated, true);
+            dispatchOnLauncherTransitionPrepare(fromView, animated, multiplePagesVisible);
             dispatchOnLauncherTransitionStart(fromView, animated, true);
             dispatchOnLauncherTransitionEnd(fromView, animated, true);
-            dispatchOnLauncherTransitionPrepare(toView, animated, true);
+            dispatchOnLauncherTransitionPrepare(toView, animated, multiplePagesVisible);
             dispatchOnLauncherTransitionStart(toView, animated, true);
             dispatchOnLauncherTransitionEnd(toView, animated, true);
             pCb.onTransitionComplete();
@@ -809,10 +813,11 @@ public class LauncherStateTransitionAnimation {
     /**
      * Dispatches the prepare-transition event to suitable views.
      */
-    void dispatchOnLauncherTransitionPrepare(View v, boolean animated, boolean toWorkspace) {
+    void dispatchOnLauncherTransitionPrepare(View v, boolean animated,
+            boolean multiplePagesVisible) {
         if (v instanceof LauncherTransitionable) {
             ((LauncherTransitionable) v).onLauncherTransitionPrepare(mLauncher, animated,
-                    toWorkspace);
+                    multiplePagesVisible);
         }
     }
 

src/com/android/launcher3/LauncherTransitionable.java

@@ -20,7 +20,7 @@ package com.android.launcher3;
  * An interface to get callbacks during a launcher transition.
  */
 public interface LauncherTransitionable {
-    void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean toWorkspace);
+    void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean multiplePagesVisible);
     void onLauncherTransitionStart(Launcher l, boolean animated, boolean toWorkspace);
     void onLauncherTransitionStep(Launcher l, float t);
     void onLauncherTransitionEnd(Launcher l, boolean animated, boolean toWorkspace);

src/com/android/launcher3/PinchAnimationManager.java

@@ -51,10 +51,10 @@ public class PinchAnimationManager {
     private static final int THRESHOLD_ANIM_DURATION = 150;
     private static final LinearInterpolator INTERPOLATOR = new LinearInterpolator();
 
-    private static int INDEX_PAGE_INDICATOR = 0;
-    private static int INDEX_HOTSEAT = 1;
-    private static int INDEX_OVERVIEW_PANEL_BUTTONS = 2;
-    private static int INDEX_SCRIM = 3;
+    private static final int INDEX_PAGE_INDICATOR = 0;
+    private static final int INDEX_HOTSEAT = 1;
+    private static final int INDEX_OVERVIEW_PANEL_BUTTONS = 2;
+    private static final int INDEX_SCRIM = 3;
 
     private final Animator[] mAnimators = new Animator[4];
 
@@ -93,20 +93,21 @@ public class PinchAnimationManager {
         }
         ValueAnimator animator = ValueAnimator.ofFloat(currentProgress, toProgress);
         animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
-               @Override
-               public void onAnimationUpdate(ValueAnimator animation) {
-                   float pinchProgress = (Float) animation.getAnimatedValue();
-                   setAnimationProgress(pinchProgress);
-                   thresholdManager.updateAndAnimatePassedThreshold(pinchProgress,
-                           PinchAnimationManager.this);
-               }
-           }
+                @Override
+                public void onAnimationUpdate(ValueAnimator animation) {
+                    float pinchProgress = (Float) animation.getAnimatedValue();
+                    setAnimationProgress(pinchProgress);
+                    thresholdManager.updateAndAnimatePassedThreshold(pinchProgress,
+                            PinchAnimationManager.this);
+                }
+            }
         );
         animator.addListener(new AnimatorListenerAdapter() {
             @Override
             public void onAnimationEnd(Animator animation) {
                 mIsAnimating = false;
                 thresholdManager.reset();
+                mWorkspace.onLauncherTransitionEnd(mLauncher, false, true);
             }
         });
         animator.setDuration(duration).start();
@@ -129,10 +130,6 @@ public class PinchAnimationManager {
         mWorkspace.setScaleY(interpolatedScale);
         mWorkspace.setTranslationY(interpolatedTranslationY);
         setOverviewPanelsAlpha(1f - interpolatedProgress, 0);
-
-        // Make sure adjacent pages, except custom content page, are visible while scaling.
-        mWorkspace.setCustomContentVisibility(View.INVISIBLE);
-        mWorkspace.invalidate();
     }
 
     /**
@@ -168,7 +165,7 @@ public class PinchAnimationManager {
             // Passing threshold 3 ends the pinch and snaps to the new state.
             if (startState == OVERVIEW && goingTowards == NORMAL) {
                 mLauncher.showWorkspace(true);
-                mWorkspace.snapToPage(mWorkspace.getPageNearestToCenterOfScreen());
+                mWorkspace.snapToPage(mWorkspace.getCurrentPage());
             } else if (startState == NORMAL && goingTowards == OVERVIEW) {
                 mLauncher.showOverviewMode(true);
             }

src/com/android/launcher3/PinchToOverviewListener.java

@@ -108,6 +108,7 @@ public class PinchToOverviewListener extends ScaleGestureDetector.SimpleOnScaleG
         mInterpolator = mWorkspace.isInOverviewMode() ? new LogDecelerateInterpolator(100, 0)
                 : new LogAccelerateInterpolator(100, 0);
         mPinchStarted = true;
+        mWorkspace.onLauncherTransitionPrepare(mLauncher, false, true);
         return true;
     }
 
@@ -137,6 +138,7 @@ public class PinchToOverviewListener extends ScaleGestureDetector.SimpleOnScaleG
                     mThresholdManager);
         } else {
             mThresholdManager.reset();
+            mWorkspace.onLauncherTransitionEnd(mLauncher, false, true);
         }
         mPinchStarted = false;
         mPinchCanceled = false;
@@ -206,6 +208,4 @@ public class PinchToOverviewListener extends ScaleGestureDetector.SimpleOnScaleG
         mPreviousTimeMillis = System.currentTimeMillis();
         return false;
     }
-
-
 }

src/com/android/launcher3/Workspace.java

@@ -179,18 +179,21 @@ public class Workspace extends PagedView
     // in all apps or customize mode)
 
     enum State {
-        NORMAL          (SearchDropTargetBar.State.SEARCH_BAR, false),
-        NORMAL_HIDDEN   (SearchDropTargetBar.State.INVISIBLE_TRANSLATED, false),
-        SPRING_LOADED   (SearchDropTargetBar.State.DROP_TARGET, false),
-        OVERVIEW        (SearchDropTargetBar.State.INVISIBLE, true),
-        OVERVIEW_HIDDEN (SearchDropTargetBar.State.INVISIBLE, true);
+        NORMAL          (SearchDropTargetBar.State.SEARCH_BAR, false, false),
+        NORMAL_HIDDEN   (SearchDropTargetBar.State.INVISIBLE_TRANSLATED, false, false),
+        SPRING_LOADED   (SearchDropTargetBar.State.DROP_TARGET, false, true),
+        OVERVIEW        (SearchDropTargetBar.State.INVISIBLE, true, true),
+        OVERVIEW_HIDDEN (SearchDropTargetBar.State.INVISIBLE, true, false);
 
         public final SearchDropTargetBar.State searchDropTargetBarState;
         public final boolean shouldUpdateWidget;
+        public final boolean hasMultipleVisiblePages;
 
-        State(SearchDropTargetBar.State searchBarState, boolean shouldUpdateWidget) {
+        State(SearchDropTargetBar.State searchBarState, boolean shouldUpdateWidget,
+                boolean hasMultipleVisiblePages) {
             searchDropTargetBarState = searchBarState;
             this.shouldUpdateWidget = shouldUpdateWidget;
+            this.hasMultipleVisiblePages = hasMultipleVisiblePages;
         }
     }
 
@@ -1838,7 +1841,7 @@ public class Workspace extends PagedView
         int end = getChildCount() - 1;
 
         range[0] = Math.max(0, Math.min(start, getChildCount() - 1));
-        range[1] = Math.max(0,  end);
+        range[1] = Math.max(0, end);
     }
 
     public void onStartReordering() {
@@ -1921,11 +1924,6 @@ public class Workspace extends PagedView
         // Update the current state
         mState = toState;
         updateAccessibilityFlags();
-        if (mState == State.OVERVIEW || mState == State.SPRING_LOADED) {
-            // Redraw pages, as we might want to draw pages which were not visible.
-            mForceDrawAdjacentPages = true;
-            invalidate(); // This will call dispatchDraw(), which calls getVisiblePages().
-        }
 
         if (shouldNotifyWidgetChange) {
             mLauncher.notifyWidgetProvidersChanged();
@@ -1978,12 +1976,15 @@ public class Workspace extends PagedView
     }
 
     @Override
-    public void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean toWorkspace) {
+    public void onLauncherTransitionPrepare(Launcher l, boolean animated,
+            boolean multiplePagesVisible) {
         mIsSwitchingState = true;
         mTransitionProgress = 0;
 
-        // Invalidate here to ensure that the pages are rendered during the state change transition.
-        invalidate();
+        if (multiplePagesVisible) {
+            mForceDrawAdjacentPages = true;
+        }
+        invalidate(); // This will call dispatchDraw(), which calls getVisiblePages().
 
         updateChildrenLayersEnabled(false);
         hideCustomContentIfNecessary();

src/com/android/launcher3/allapps/AllAppsContainerView.java

@@ -514,7 +514,8 @@ public class AllAppsContainerView extends BaseContainerView implements DragSourc
     }
 
     @Override
-    public void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean toWorkspace) {
+    public void onLauncherTransitionPrepare(Launcher l, boolean animated,
+            boolean multiplePagesVisible) {
         // Do nothing
     }