Change overview animation to scale instead of translationX

As you swipe up to overview from home, workspace scales down and fades out as before,
and now recents scales down from 1.2f on top of it. The interpolators are set such
that the workspace animation is seen before the recents animation. Also, we don't
scale down all of recents, only the visible pages (current and adjacent).

Change-Id: I5f8bfe8cafeaa41d26873c63549735d7bdff2bce
diff --git a/quickstep/src/com/android/launcher3/uioverrides/AllAppsState.java b/quickstep/src/com/android/launcher3/uioverrides/AllAppsState.java
index 2626e7c..0e3d2a4 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/AllAppsState.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/AllAppsState.java
@@ -88,10 +88,10 @@
     }
 
     @Override
-    public float[] getOverviewTranslationFactor(Launcher launcher) {
-        // Keep the same translation as in overview, so that we don't slide around when
+    public float[] getOverviewScaleAndTranslationYFactor(Launcher launcher) {
+        // Keep the same transition properties as overview, so that we don't move around when
         // transitioning to All Apps.
-        return LauncherState.OVERVIEW.getOverviewTranslationFactor(launcher);
+        return LauncherState.OVERVIEW.getOverviewScaleAndTranslationYFactor(launcher);
     }
 
     @Override
diff --git a/quickstep/src/com/android/launcher3/uioverrides/FastOverviewState.java b/quickstep/src/com/android/launcher3/uioverrides/FastOverviewState.java
index 99bf264..f98f7a5 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/FastOverviewState.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/FastOverviewState.java
@@ -50,7 +50,7 @@
     }
 
     @Override
-    public float[] getOverviewTranslationFactor(Launcher launcher) {
-        return new float[] {0f, 0.5f};
+    public float[] getOverviewScaleAndTranslationYFactor(Launcher launcher) {
+        return new float[] {1f, 0.5f};
     }
 }
diff --git a/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java b/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
index 4b2763b..d97b7b2 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
@@ -58,8 +58,8 @@
     }
 
     @Override
-    public float[] getOverviewTranslationFactor(Launcher launcher) {
-        return new float[] {0f, 0f};
+    public float[] getOverviewScaleAndTranslationYFactor(Launcher launcher) {
+        return new float[] {1f, 0f};
     }
 
     @Override
diff --git a/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java b/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
index 0c34b45..1b65ca0 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
@@ -61,9 +61,6 @@
 
     private InterpolatorWrapper mAllAppsInterpolatorWrapper = new InterpolatorWrapper();
 
-    // If > 0, the animation progress is clamped at that value as long as user is dragging.
-    private float mClampProgressUpdate = -1;
-
     // If true, we will finish the current animation instantly on second touch.
     private boolean mFinishFastOnSecondTouch;
 
@@ -166,15 +163,6 @@
     }
 
     @Override
-    protected void updateProgress(float fraction) {
-        if (mClampProgressUpdate > 0) {
-            mCurrentAnimation.setPlayFraction(Math.min(fraction, mClampProgressUpdate));
-        } else {
-            super.updateProgress(fraction);
-        }
-    }
-
-    @Override
     protected float initCurrentAnimation() {
         float range = getShiftRange();
         long maxAccuracy = (long) (2 * range);
@@ -189,10 +177,8 @@
         if (mFromState == NORMAL && mToState == OVERVIEW && totalShift != 0) {
             builder = getNormalToOverviewAnimation();
             totalShift = totalShift * TOTAL_DISTANCE_MULTIPLIER;
-            mClampProgressUpdate = MAXIMUM_DISTANCE_FACTOR;
         } else {
             builder = new AnimatorSetBuilder();
-            mClampProgressUpdate = -1;
         }
 
         if (mPendingAnimation != null) {
diff --git a/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java b/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
index 9f7fef3..124ec20 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
@@ -15,11 +15,11 @@
  */
 package com.android.launcher3.uioverrides;
 
-import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_OVERVIEW_TRANSLATION;
+import static com.android.launcher3.anim.Interpolators.AGGRESSIVE_EASE_IN_OUT;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
-import static com.android.quickstep.views.LauncherRecentsView.TRANSLATION_X_FACTOR;
 import static com.android.quickstep.views.LauncherRecentsView.TRANSLATION_Y_FACTOR;
+import static com.android.quickstep.views.RecentsView.ADJACENT_SCALE;
 import static com.android.quickstep.views.RecentsView.CONTENT_ALPHA;
 
 import android.animation.ValueAnimator;
@@ -30,7 +30,6 @@
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.LauncherStateManager.AnimationConfig;
 import com.android.launcher3.LauncherStateManager.StateHandler;
-import com.android.launcher3.PagedView;
 import com.android.launcher3.anim.AnimatorSetBuilder;
 import com.android.launcher3.anim.PropertySetter;
 import com.android.quickstep.views.LauncherRecentsView;
@@ -49,9 +48,9 @@
     @Override
     public void setState(LauncherState state) {
         mRecentsView.setContentAlpha(state.overviewUi ? 1 : 0);
-        float[] translationFactor = state.getOverviewTranslationFactor(mLauncher);
-        mRecentsView.setTranslationXFactor(translationFactor[0]);
-        mRecentsView.setTranslationYFactor(translationFactor[1]);
+        float[] scaleTranslationYFactor = state.getOverviewScaleAndTranslationYFactor(mLauncher);
+        mRecentsView.setAdjacentScale(scaleTranslationYFactor[0]);
+        mRecentsView.setTranslationYFactor(scaleTranslationYFactor[1]);
         if (state.overviewUi) {
             mRecentsView.updateEmptyMessage();
             mRecentsView.resetTaskVisuals();
@@ -61,28 +60,18 @@
     @Override
     public void setStateWithAnimation(final LauncherState toState,
             AnimatorSetBuilder builder, AnimationConfig config) {
-
-        // Scroll to the workspace card before changing to the NORMAL state.
-        LauncherState fromState = mLauncher.getStateManager().getState();
-        int currPage = mRecentsView.getCurrentPage();
-        if (fromState.overviewUi && toState == NORMAL && currPage != 0 && !config.userControlled) {
-            int maxSnapDuration = PagedView.SLOW_PAGE_SNAP_ANIMATION_DURATION;
-            int durationPerPage = maxSnapDuration / 10;
-            int snapDuration = Math.min(maxSnapDuration, durationPerPage * currPage);
-            mRecentsView.snapToPage(0, snapDuration);
-            // Let the snapping animation play for a bit before we translate off screen.
-            builder.setStartDelay(snapDuration / 4);
-        }
-
         PropertySetter setter = config.getProperSetter(builder);
-        float[] translationFactor = toState.getOverviewTranslationFactor(mLauncher);
-        setter.setFloat(mRecentsView, TRANSLATION_X_FACTOR,
-                translationFactor[0],
+        float[] scaleTranslationYFactor = toState.getOverviewScaleAndTranslationYFactor(mLauncher);
+        setter.setFloat(mRecentsView, ADJACENT_SCALE, scaleTranslationYFactor[0],
                 builder.getInterpolator(ANIM_OVERVIEW_TRANSLATION, LINEAR));
-        setter.setFloat(mRecentsView, TRANSLATION_Y_FACTOR,
-                translationFactor[1],
+        setter.setFloat(mRecentsView, TRANSLATION_Y_FACTOR, scaleTranslationYFactor[1],
                 builder.getInterpolator(ANIM_OVERVIEW_TRANSLATION, LINEAR));
-        setter.setFloat(mRecentsView, CONTENT_ALPHA, toState.overviewUi ? 1 : 0, LINEAR);
+        setter.setFloat(mRecentsView, CONTENT_ALPHA, toState.overviewUi ? 1 : 0,
+                AGGRESSIVE_EASE_IN_OUT);
+
+        if (!toState.overviewUi) {
+            builder.addOnFinishRunnable(mRecentsView::resetTaskVisuals);
+        }
 
         if (toState.overviewUi) {
             ValueAnimator updateAnim = ValueAnimator.ofFloat(0, 1);
diff --git a/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java b/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
index d428f23..6788827 100644
--- a/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
@@ -20,7 +20,6 @@
 import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.allapps.AllAppsTransitionController.ALL_APPS_PROGRESS;
 
-import android.animation.Animator;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.annotation.TargetApi;
@@ -45,20 +44,6 @@
 @TargetApi(Build.VERSION_CODES.O)
 public class LauncherRecentsView extends RecentsView<Launcher> implements Insettable {
 
-    public static final FloatProperty<LauncherRecentsView> TRANSLATION_X_FACTOR =
-            new FloatProperty<LauncherRecentsView>("translationXFactor") {
-
-                @Override
-                public void setValue(LauncherRecentsView view, float v) {
-                    view.setTranslationXFactor(v);
-                }
-
-                @Override
-                public Float get(LauncherRecentsView view) {
-                    return view.mTranslationXFactor;
-                }
-            };
-
     public static final FloatProperty<LauncherRecentsView> TRANSLATION_Y_FACTOR =
             new FloatProperty<LauncherRecentsView>("translationYFactor") {
 
@@ -74,8 +59,6 @@
             };
 
     @ViewDebug.ExportedProperty(category = "launcher")
-    private float mTranslationXFactor;
-    @ViewDebug.ExportedProperty(category = "launcher")
     private float mTranslationYFactor;
 
     private Rect mPagePadding = new Rect();
@@ -114,11 +97,6 @@
         setTranslationYFactor(mTranslationYFactor);
     }
 
-    public void setTranslationXFactor(float translationFactor) {
-        mTranslationXFactor = translationFactor;
-        invalidate();
-    }
-
     public void setTranslationYFactor(float translationFactor) {
         mTranslationYFactor = translationFactor;
         setTranslationY(mTranslationYFactor * (mPagePadding.bottom - mPagePadding.top));
@@ -127,10 +105,7 @@
     @Override
     public void draw(Canvas canvas) {
         maybeDrawEmptyMessage(canvas);
-        int count = canvas.save();
-        canvas.translate(mTranslationXFactor * (mIsRtl ? -getWidth() : getWidth()), 0);
         super.draw(canvas);
-        canvas.restoreToCount(count);
     }
 
     @Override
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index e7f69b7..f6b6abd 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -59,8 +59,8 @@
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.anim.PropertyListBuilder;
 import com.android.launcher3.config.FeatureFlags;
-import com.android.launcher3.util.Themes;
 import com.android.launcher3.util.PendingAnimation;
+import com.android.launcher3.util.Themes;
 import com.android.quickstep.QuickScrubController;
 import com.android.quickstep.RecentsAnimationInterpolator;
 import com.android.quickstep.RecentsAnimationInterpolator.TaskWindowBounds;
@@ -85,8 +85,6 @@
 
     public static final FloatProperty<RecentsView> CONTENT_ALPHA =
             new FloatProperty<RecentsView>("contentAlpha") {
-
-
         @Override
         public void setValue(RecentsView recentsView, float v) {
             recentsView.setContentAlpha(v);
@@ -98,6 +96,20 @@
         }
     };
 
+
+
+    public static final FloatProperty<RecentsView> ADJACENT_SCALE =
+            new FloatProperty<RecentsView>("adjacentScale") {
+        @Override
+        public void setValue(RecentsView recentsView, float v) {
+            recentsView.setAdjacentScale(v);
+        }
+
+        @Override
+        public Float get(RecentsView recentsView) {
+            return recentsView.mAdjacentScale;
+        }
+    };
     private static final String PREF_FLIP_RECENTS = "pref_flip_recents";
     private static final int DISMISS_TASK_DURATION = 300;
 
@@ -145,6 +157,8 @@
 
     @ViewDebug.ExportedProperty(category = "launcher")
     private float mContentAlpha = 1;
+    @ViewDebug.ExportedProperty(category = "launcher")
+    private float mAdjacentScale = 1;
 
     // Keeps track of task views whose visual state should not be reset
     private ArraySet<TaskView> mIgnoreResetTaskViews = new ArraySet<>();
@@ -803,10 +817,58 @@
         setVisibility(alpha > 0 ? VISIBLE : GONE);
     }
 
+    public void setAdjacentScale(float adjacentScale) {
+        if (mAdjacentScale == adjacentScale) {
+            return;
+        }
+        mAdjacentScale = adjacentScale;
+        TaskView currTask = getPageAt(mCurrentPage);
+        if (currTask == null) {
+            return;
+        }
+        currTask.setScaleX(mAdjacentScale);
+        currTask.setScaleY(mAdjacentScale);
+
+        if (mCurrentPage - 1 >= 0) {
+            TaskView adjacentTask = getPageAt(mCurrentPage - 1);
+            float[] scaleAndTranslation = getAdjacentScaleAndTranslation(currTask, adjacentTask,
+                    mAdjacentScale, 0);
+            adjacentTask.setScaleX(scaleAndTranslation[0]);
+            adjacentTask.setScaleY(scaleAndTranslation[0]);
+            adjacentTask.setTranslationX(-scaleAndTranslation[1]);
+            adjacentTask.setTranslationY(scaleAndTranslation[2]);
+        }
+        if (mCurrentPage + 1 < getChildCount()) {
+            TaskView adjacentTask = getPageAt(mCurrentPage + 1);
+            float[] scaleAndTranslation = getAdjacentScaleAndTranslation(currTask, adjacentTask,
+                    mAdjacentScale, 0);
+            adjacentTask.setScaleX(scaleAndTranslation[0]);
+            adjacentTask.setScaleY(scaleAndTranslation[0]);
+            adjacentTask.setTranslationX(scaleAndTranslation[1]);
+            adjacentTask.setTranslationY(scaleAndTranslation[2]);
+        }
+    }
+
+    private float[] getAdjacentScaleAndTranslation(TaskView currTask, TaskView adjacentTask,
+            float currTaskToScale, float currTaskToTranslationY) {
+        float displacement = currTask.getWidth() * (currTaskToScale - currTask.getCurveScale());
+        return new float[] {
+                currTaskToScale * adjacentTask.getCurveScale(),
+                mIsRtl ? -displacement : displacement,
+                currTaskToTranslationY
+        };
+    }
+
     @Override
     public void onViewAdded(View child) {
         super.onViewAdded(child);
         child.setAlpha(mContentAlpha);
+        setAdjacentScale(mAdjacentScale);
+    }
+
+    @Override
+    public TaskView getPageAt(int index) {
+        return (TaskView) getChildAt(index);
     }
 
     public void updateEmptyMessage() {
@@ -884,18 +946,24 @@
         float toScale = endInterpolation.taskScale;
         float toTranslationY = endInterpolation.taskY;
 
-        float displacementX = tv.getWidth() * (toScale - tv.getScaleX());
         if (launchingCenterTask) {
+            TaskView centerTask = getPageAt(centerTaskIndex);
             if (taskIndex - 1 >= 0) {
-                anim.play(createAnimForChild(
-                        taskIndex - 1, toScale, displacementX, toTranslationY));
+                TaskView adjacentTask = getPageAt(taskIndex - 1);
+                float[] scaleAndTranslation = getAdjacentScaleAndTranslation(centerTask,
+                        adjacentTask, toScale, toTranslationY);
+                scaleAndTranslation[1] = -scaleAndTranslation[1];
+                anim.play(createAnimForChild(adjacentTask, scaleAndTranslation));
             }
             if (taskIndex + 1 < getPageCount()) {
-                anim.play(createAnimForChild(
-                        taskIndex + 1, toScale, -displacementX, toTranslationY));
+                TaskView adjacentTask = getPageAt(taskIndex + 1);
+                float[] scaleAndTranslation = getAdjacentScaleAndTranslation(centerTask,
+                        adjacentTask, toScale, toTranslationY);
+                anim.play(createAnimForChild(adjacentTask, scaleAndTranslation));
             }
         } else {
             // We are launching an adjacent task, so parallax the center and other adjacent task.
+            float displacementX = tv.getWidth() * (toScale - tv.getCurveScale());
             anim.play(ObjectAnimator.ofFloat(getPageAt(centerTaskIndex), TRANSLATION_X,
                     mIsRtl ? -displacementX : displacementX));
 
@@ -911,13 +979,12 @@
         return anim;
     }
 
-    private ObjectAnimator createAnimForChild(int childIndex, float toScale, float tx, float ty) {
-        View child = getChildAt(childIndex);
+    private ObjectAnimator createAnimForChild(View child, float[] toScaleAndTranslation) {
         return ObjectAnimator.ofPropertyValuesHolder(child,
                         new PropertyListBuilder()
-                                .scale(child.getScaleX() * toScale)
-                                .translationY(ty)
-                                .translationX(mIsRtl ? tx : -tx)
+                                .scale(child.getScaleX() * toScaleAndTranslation[0])
+                                .translationX(toScaleAndTranslation[1])
+                                .translationY(toScaleAndTranslation[2])
                                 .build());
     }
 
diff --git a/quickstep/src/com/android/quickstep/views/TaskView.java b/quickstep/src/com/android/quickstep/views/TaskView.java
index 57516b0..42da472 100644
--- a/quickstep/src/com/android/quickstep/views/TaskView.java
+++ b/quickstep/src/com/android/quickstep/views/TaskView.java
@@ -70,6 +70,7 @@
     private Task mTask;
     private TaskThumbnailView mSnapshotView;
     private ImageView mIconView;
+    private float mCurveScale;
 
     public TaskView(Context context) {
         this(context, null);
@@ -178,9 +179,13 @@
 
         mSnapshotView.setDimAlpha(1 - curveInterpolation * MAX_PAGE_SCRIM_ALPHA);
 
-        float scale = 1 - curveInterpolation * EDGE_SCALE_DOWN_FACTOR;
-        setScaleX(scale);
-        setScaleY(scale);
+        mCurveScale = 1 - curveInterpolation * EDGE_SCALE_DOWN_FACTOR;
+        setScaleX(mCurveScale);
+        setScaleY(mCurveScale);
+    }
+
+    public float getCurveScale() {
+        return mCurveScale;
     }
 
     @Override
diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index fdb6f48..4697b82 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -181,12 +181,12 @@
     }
 
     /**
-     * Returns 2 floats designating how much to translate overview:
-     *   X factor is based on width, e.g. 0 is fully onscreen and 1 is fully offscreen
-     *   Y factor is based on padding, e.g. 0 is top aligned and 0.5 is centered vertically
+     * Returns 2 floats designating how to transition overview:
+     *   scale for the current and adjacent pages
+     *   translationY factor where 0 is top aligned and 0.5 is centered vertically
      */
-    public float[] getOverviewTranslationFactor(Launcher launcher) {
-        return new float[] {1f, 0f};
+    public float[] getOverviewScaleAndTranslationYFactor(Launcher launcher) {
+        return new float[] {1.2f, 0.2f};
     }
 
     public void onStateEnabled(Launcher launcher) {
diff --git a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
index fa86906..420a7c4 100644
--- a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
+++ b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
@@ -31,7 +31,6 @@
 import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.anim.PropertySetter;
 import com.android.launcher3.graphics.ViewScrim;
-import com.android.launcher3.uioverrides.UiFactory;
 
 /**
  * Manages the animations between each of the workspace states.
@@ -74,11 +73,11 @@
                     propertySetter);
         }
 
-        propertySetter.setFloat(mWorkspace, SCALE_PROPERTY, mNewScale, Interpolators.ZOOM_IN);
+        propertySetter.setFloat(mWorkspace, SCALE_PROPERTY, mNewScale, Interpolators.ZOOM_OUT);
         propertySetter.setFloat(mWorkspace, View.TRANSLATION_X,
-                scaleAndTranslation[1], Interpolators.ZOOM_IN);
+                scaleAndTranslation[1], Interpolators.ZOOM_OUT);
         propertySetter.setFloat(mWorkspace, View.TRANSLATION_Y,
-                scaleAndTranslation[2], Interpolators.ZOOM_IN);
+                scaleAndTranslation[2], Interpolators.ZOOM_OUT);
 
         int elements = state.getVisibleElements(mLauncher);
         float hotseatIconsAlpha = (elements & HOTSEAT_ICONS) != 0 ? 1 : 0;
@@ -113,7 +112,7 @@
         int drawableAlpha = Math.round(pageAlpha * (state.hasWorkspacePageBackground ? 255 : 0));
 
         propertySetter.setInt(cl.getScrimBackground(),
-                DRAWABLE_ALPHA, drawableAlpha, Interpolators.ZOOM_IN);
+                DRAWABLE_ALPHA, drawableAlpha, Interpolators.ZOOM_OUT);
         propertySetter.setFloat(cl.getShortcutsAndWidgets(), View.ALPHA,
                 pageAlpha, pageAlphaProvider.interpolator);
     }
diff --git a/src/com/android/launcher3/anim/AnimatorSetBuilder.java b/src/com/android/launcher3/anim/AnimatorSetBuilder.java
index 9191048..b209a2d 100644
--- a/src/com/android/launcher3/anim/AnimatorSetBuilder.java
+++ b/src/com/android/launcher3/anim/AnimatorSetBuilder.java
@@ -16,6 +16,7 @@
 package com.android.launcher3.anim;
 
 import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.util.SparseArray;
 import android.view.animation.Interpolator;
@@ -23,6 +24,7 @@
 import com.android.launcher3.LauncherAnimUtils;
 
 import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Utility class for building animator set
@@ -35,7 +37,7 @@
     protected final ArrayList<Animator> mAnims = new ArrayList<>();
 
     private final SparseArray<Interpolator> mInterpolators = new SparseArray<>();
-    private long mStartDelay = 0;
+    private List<Runnable> mOnFinishRunnables = new ArrayList<>();
 
     /**
      * Associates a tag with all the animations added after this call.
@@ -46,14 +48,24 @@
         mAnims.add(anim);
     }
 
-    public void setStartDelay(long startDelay) {
-        mStartDelay = startDelay;
+    public void addOnFinishRunnable(Runnable onFinishRunnable) {
+        mOnFinishRunnables.add(onFinishRunnable);
     }
 
     public AnimatorSet build() {
         AnimatorSet anim = LauncherAnimUtils.createAnimatorSet();
         anim.playTogether(mAnims);
-        anim.setStartDelay(mStartDelay);
+        if (!mOnFinishRunnables.isEmpty()) {
+            anim.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    for (Runnable onFinishRunnable : mOnFinishRunnables) {
+                        onFinishRunnable.run();
+                    }
+                    mOnFinishRunnables.clear();
+                }
+            });
+        }
         return anim;
     }
 
diff --git a/src/com/android/launcher3/anim/Interpolators.java b/src/com/android/launcher3/anim/Interpolators.java
index 6078776..06ddf22 100644
--- a/src/com/android/launcher3/anim/Interpolators.java
+++ b/src/com/android/launcher3/anim/Interpolators.java
@@ -65,15 +65,22 @@
             new PathInterpolator(0.3f, 0f, 0.1f, 1f);
 
     /**
-     * Inversion of zInterpolate, compounded with an ease-out.
+     * Inversion of ZOOM_OUT, compounded with an ease-out.
      */
     public static final Interpolator ZOOM_IN = new Interpolator() {
+        @Override
+        public float getInterpolation(float v) {
+            return DEACCEL_3.getInterpolation(1 - ZOOM_OUT.getInterpolation(1 - v));
+        }
+    };
+
+    public static final Interpolator ZOOM_OUT = new Interpolator() {
 
         private static final float FOCAL_LENGTH = 0.35f;
 
         @Override
         public float getInterpolation(float v) {
-            return DEACCEL_3.getInterpolation(1 - zInterpolate(1 - v));
+            return zInterpolate(v);
         }
 
         /**