Speed up All Apps -> Workspace transition

- use HW layers on Views whose alpha is faded
- don't run animation end code until the entire launcher
transition is finished
- be more aggressive about making workspace pages visible
after an animation, potential fix for Bug #5867739

Change-Id: I52a088e551c1636a67725629640286b885070f32
diff --git a/src/com/android/launcher2/Launcher.java b/src/com/android/launcher2/Launcher.java
index ab25780..2b91302 100644
--- a/src/com/android/launcher2/Launcher.java
+++ b/src/com/android/launcher2/Launcher.java
@@ -2158,6 +2158,18 @@
         }
     }
 
+    private void dispatchOnLauncherTransitionStart(View v, boolean animated, boolean toWorkspace) {
+        if (v instanceof LauncherTransitionable) {
+            ((LauncherTransitionable) v).onLauncherTransitionStart(this, animated, toWorkspace);
+        }
+    }
+
+    private void dispatchOnLauncherTransitionEnd(View v, boolean animated, boolean toWorkspace) {
+        if (v instanceof LauncherTransitionable) {
+            ((LauncherTransitionable) v).onLauncherTransitionEnd(this, animated, toWorkspace);
+        }
+    }
+
     /**
      * Things to test when changing the following seven functions.
      *   - Home from workspace
@@ -2203,7 +2215,7 @@
      * Assumes that the view to show is anchored at either the very top or very bottom
      * of the screen.
      */
-    private void showAppsCustomizeHelper(boolean animated, final boolean springLoaded) {
+    private void showAppsCustomizeHelper(final boolean animated, final boolean springLoaded) {
         if (mStateAnimation != null) {
             mStateAnimation.cancel();
             mStateAnimation = null;
@@ -2214,6 +2226,7 @@
         final int duration = res.getInteger(R.integer.config_appsCustomizeZoomInTime);
         final int fadeDuration = res.getInteger(R.integer.config_appsCustomizeFadeInTime);
         final float scale = (float) res.getInteger(R.integer.config_appsCustomizeZoomScaleFactor);
+        final View fromView = mWorkspace;
         final View toView = mAppsCustomizeTabHost;
         final int startDelay =
                 res.getInteger(R.integer.config_workspaceAppsCustomizeAnimationStagger);
@@ -2260,10 +2273,8 @@
                 }
                 @Override
                 public void onAnimationEnd(Animator animation) {
-                    if (toView instanceof LauncherTransitionable) {
-                        ((LauncherTransitionable) toView).onLauncherTransitionEnd(instance,
-                                scaleAnim, false);
-                    }
+                    dispatchOnLauncherTransitionEnd(fromView, animated, false);
+                    dispatchOnLauncherTransitionEnd(toView, animated, false);
 
                     if (!springLoaded && !LauncherApplication.isScreenLarge()) {
                         // Hide the workspace scrollbar
@@ -2286,14 +2297,14 @@
             }
 
             boolean delayAnim = false;
-            LauncherTransitionable lt = (LauncherTransitionable) toView;
             final ViewTreeObserver observer;
 
-            lt.onLauncherTransitionStart(instance, mStateAnimation, false);
+            dispatchOnLauncherTransitionStart(fromView, animated, false);
+            dispatchOnLauncherTransitionStart(toView, animated, false);
 
             // If any of the objects being animated haven't been measured/laid out
             // yet, delay the animation until we get a layout pass
-            if ((lt.getContent().getMeasuredWidth() == 0) ||
+            if ((((LauncherTransitionable) toView).getContent().getMeasuredWidth() == 0) ||
                     (mWorkspace.getMeasuredWidth() == 0) ||
                     (toView.getMeasuredWidth() == 0)) {
                 observer = mWorkspace.getViewTreeObserver();
@@ -2332,16 +2343,16 @@
             toView.setScaleY(1.0f);
             toView.setVisibility(View.VISIBLE);
             toView.bringToFront();
-            if (toView instanceof LauncherTransitionable) {
-                ((LauncherTransitionable) toView).onLauncherTransitionStart(instance, null, false);
-                ((LauncherTransitionable) toView).onLauncherTransitionEnd(instance, null, false);
 
-                if (!springLoaded && !LauncherApplication.isScreenLarge()) {
-                    // Hide the workspace scrollbar
-                    mWorkspace.hideScrollingIndicator(true);
-                    hideDockDivider();
-                }
+            if (!springLoaded && !LauncherApplication.isScreenLarge()) {
+                // Hide the workspace scrollbar
+                mWorkspace.hideScrollingIndicator(true);
+                hideDockDivider();
             }
+            dispatchOnLauncherTransitionStart(fromView, animated, false);
+            dispatchOnLauncherTransitionEnd(fromView, animated, false);
+            dispatchOnLauncherTransitionStart(toView, animated, false);
+            dispatchOnLauncherTransitionEnd(toView, animated, false);
             updateWallpaperVisibility(false);
         }
     }
@@ -2352,13 +2363,12 @@
      * @param animated If true, the transition will be animated.
      */
     private void hideAppsCustomizeHelper(
-            State toState, boolean animated, final boolean springLoaded) {
+            State toState, final boolean animated, final boolean springLoaded) {
         if (mStateAnimation != null) {
             mStateAnimation.cancel();
             mStateAnimation = null;
         }
         Resources res = getResources();
-        final Launcher instance = this;
 
         final int duration = res.getInteger(R.integer.config_appsCustomizeZoomOutTime);
         final int fadeOutDuration =
@@ -2366,6 +2376,7 @@
         final float scaleFactor = (float)
                 res.getInteger(R.integer.config_appsCustomizeZoomScaleFactor);
         final View fromView = mAppsCustomizeTabHost;
+        final View toView = mWorkspace;
         Animator workspaceAnim = null;
 
         if (toState == State.WORKSPACE) {
@@ -2396,24 +2407,22 @@
                 .setDuration(fadeOutDuration);
             alphaAnim.setInterpolator(new AccelerateDecelerateInterpolator());
 
-            if (fromView instanceof LauncherTransitionable) {
-                ((LauncherTransitionable) fromView).onLauncherTransitionStart(instance, alphaAnim,
-                        true);
-            }
-            alphaAnim.addListener(new AnimatorListenerAdapter() {
+            mStateAnimation = new AnimatorSet();
+
+            dispatchOnLauncherTransitionStart(fromView, animated, true);
+            dispatchOnLauncherTransitionStart(toView, animated, true);
+
+            mStateAnimation.addListener(new AnimatorListenerAdapter() {
                 @Override
                 public void onAnimationEnd(Animator animation) {
                     updateWallpaperVisibility(true);
                     fromView.setVisibility(View.GONE);
-                    if (fromView instanceof LauncherTransitionable) {
-                        ((LauncherTransitionable) fromView).onLauncherTransitionEnd(instance,
-                                alphaAnim, true);
-                    }
+                    dispatchOnLauncherTransitionEnd(fromView, animated, true);
+                    dispatchOnLauncherTransitionEnd(toView, animated, true);
                     mWorkspace.hideScrollingIndicator(false);
                 }
             });
 
-            mStateAnimation = new AnimatorSet();
             mStateAnimation.playTogether(scaleAnim, alphaAnim);
             if (workspaceAnim != null) {
                 mStateAnimation.play(workspaceAnim);
@@ -2421,10 +2430,10 @@
             mStateAnimation.start();
         } else {
             fromView.setVisibility(View.GONE);
-            if (fromView instanceof LauncherTransitionable) {
-                ((LauncherTransitionable) fromView).onLauncherTransitionStart(instance, null, true);
-                ((LauncherTransitionable) fromView).onLauncherTransitionEnd(instance, null, true);
-            }
+            dispatchOnLauncherTransitionStart(fromView, animated, false);
+            dispatchOnLauncherTransitionEnd(fromView, animated, false);
+            dispatchOnLauncherTransitionStart(toView, animated, false);
+            dispatchOnLauncherTransitionEnd(toView, animated, false);
             mWorkspace.hideScrollingIndicator(false);
         }
     }
@@ -3366,6 +3375,6 @@
 
 interface LauncherTransitionable {
     View getContent();
-    void onLauncherTransitionStart(Launcher l, Animator animation, boolean toWorkspace);
-    void onLauncherTransitionEnd(Launcher l, Animator animation, boolean toWorkspace);
+    void onLauncherTransitionStart(Launcher l, boolean animated, boolean toWorkspace);
+    void onLauncherTransitionEnd(Launcher l, boolean animated, boolean toWorkspace);
 }