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

4 files changed, 34 insertions, 16 deletions

diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index fdb6f482a..4697b82f8 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -181,12 +181,12 @@ public class LauncherState {
     }
 
     /**
-     * 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 fa86906cf..420a7c418 100644
--- a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
+++ b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
@@ -31,7 +31,6 @@ import com.android.launcher3.anim.AnimatorSetBuilder;
 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 @@ public class WorkspaceStateTransitionAnimation {
                     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 @@ public class WorkspaceStateTransitionAnimation {
         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 919104886..b209a2dee 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 android.view.animation.Interpolator;
 import com.android.launcher3.LauncherAnimUtils;
 
 import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Utility class for building animator set
@@ -35,7 +37,7 @@ public class AnimatorSetBuilder {
     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 @@ public class AnimatorSetBuilder {
         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 6078776e0..06ddf2208 100644
--- a/src/com/android/launcher3/anim/Interpolators.java
+++ b/src/com/android/launcher3/anim/Interpolators.java
@@ -65,15 +65,22 @@ public class Interpolators {
             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);
         }
 
         /**