Make popup window enter animation more like app transition enter

Merges the translate and clip reveal so that we can adjust the clip
position based on the current translate position. This ensures the
clip appears to expand from the center of the translated popup and
never extends outside the window bounds.

Change-Id: I8bbb9c0e2293a25f7807d71d9b8779bb782d4784

5 files changed, 341 insertions, 441 deletions

diff --git a/core/java/com/android/internal/transition/EpicenterClipReveal.java b/core/java/com/android/internal/transition/EpicenterClipReveal.java
deleted file mode 100644
index 1a6736a..0000000
--- a/core/java/com/android/internal/transition/EpicenterClipReveal.java
+++ /dev/null
@@ -1,233 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.android.internal.transition;
-
-import android.animation.Animator;
-import android.animation.AnimatorListenerAdapter;
-import android.animation.AnimatorSet;
-import android.animation.ObjectAnimator;
-import android.animation.RectEvaluator;
-import android.animation.TimeInterpolator;
-import android.content.Context;
-import android.content.res.TypedArray;
-import android.graphics.Rect;
-import android.transition.TransitionValues;
-import android.transition.Visibility;
-import android.util.AttributeSet;
-import android.util.Property;
-import android.view.View;
-import android.view.ViewGroup;
-import android.view.animation.AnimationUtils;
-import android.view.animation.PathInterpolator;
-
-import com.android.internal.R;
-
-/**
- * EpicenterClipReveal captures the {@link View#getClipBounds()} before and
- * after the scene change and animates between those and the epicenter bounds
- * during a visibility transition.
- */
-public class EpicenterClipReveal extends Visibility {
-    private static final String PROPNAME_CLIP = "android:epicenterReveal:clip";
-    private static final String PROPNAME_BOUNDS = "android:epicenterReveal:bounds";
-
-    private final TimeInterpolator mInterpolatorX;
-    private final TimeInterpolator mInterpolatorY;
-    private final boolean mCenterClipBounds;
-
-    public EpicenterClipReveal() {
-        mInterpolatorX = null;
-        mInterpolatorY = null;
-        mCenterClipBounds = false;
-    }
-
-    public EpicenterClipReveal(Context context, AttributeSet attrs) {
-        super(context, attrs);
-
-        final TypedArray a = context.obtainStyledAttributes(attrs,
-                R.styleable.EpicenterClipReveal, 0, 0);
-
-        mCenterClipBounds = a.getBoolean(R.styleable.EpicenterClipReveal_centerClipBounds, false);
-
-        final int interpolatorX = a.getResourceId(R.styleable.EpicenterClipReveal_interpolatorX, 0);
-        if (interpolatorX != 0) {
-            mInterpolatorX = AnimationUtils.loadInterpolator(context, interpolatorX);
-        } else {
-            mInterpolatorX = TransitionConstants.LINEAR_OUT_SLOW_IN;
-        }
-
-        final int interpolatorY = a.getResourceId(R.styleable.EpicenterClipReveal_interpolatorY, 0);
-        if (interpolatorY != 0) {
-            mInterpolatorY = AnimationUtils.loadInterpolator(context, interpolatorY);
-        } else {
-            mInterpolatorY = TransitionConstants.FAST_OUT_SLOW_IN;
-        }
-
-        a.recycle();
-    }
-
-    @Override
-    public void captureStartValues(TransitionValues transitionValues) {
-        super.captureStartValues(transitionValues);
-        captureValues(transitionValues);
-    }
-
-    @Override
-    public void captureEndValues(TransitionValues transitionValues) {
-        super.captureEndValues(transitionValues);
-        captureValues(transitionValues);
-    }
-
-    private void captureValues(TransitionValues values) {
-        final View view = values.view;
-        if (view.getVisibility() == View.GONE) {
-            return;
-        }
-
-        final Rect clip = view.getClipBounds();
-        values.values.put(PROPNAME_CLIP, clip);
-
-        if (clip == null) {
-            final Rect bounds = new Rect(0, 0, view.getWidth(), view.getHeight());
-            values.values.put(PROPNAME_BOUNDS, bounds);
-        }
-    }
-
-    @Override
-    public Animator onAppear(ViewGroup sceneRoot, View view,
-            TransitionValues startValues, TransitionValues endValues) {
-        if (endValues == null) {
-            return null;
-        }
-
-        final Rect end = getBestRect(endValues);
-        final Rect start = getEpicenterOrCenter(end);
-
-        // Prepare the view.
-        view.setClipBounds(start);
-
-        return createRectAnimator(view, start, end, endValues, mInterpolatorX, mInterpolatorY);
-    }
-
-    @Override
-    public Animator onDisappear(ViewGroup sceneRoot, View view,
-            TransitionValues startValues, TransitionValues endValues) {
-        if (startValues == null) {
-            return null;
-        }
-
-        final Rect start = getBestRect(startValues);
-        final Rect end = getEpicenterOrCenter(start);
-
-        // Prepare the view.
-        view.setClipBounds(start);
-
-        return createRectAnimator(view, start, end, endValues, mInterpolatorX, mInterpolatorY);
-    }
-
-    private Rect getEpicenterOrCenter(Rect bestRect) {
-        final Rect epicenter = getEpicenter();
-        if (epicenter != null) {
-            // Translate the clip bounds to be centered within the target bounds.
-            if (mCenterClipBounds) {
-                final int offsetX = bestRect.centerX() - epicenter.centerX();
-                final int offsetY = bestRect.centerY() - epicenter.centerY();
-                epicenter.offset(offsetX, offsetY);
-            }
-            return epicenter;
-        }
-
-        final int centerX = bestRect.centerX();
-        final int centerY = bestRect.centerY();
-        return new Rect(centerX, centerY, centerX, centerY);
-    }
-
-    private Rect getBestRect(TransitionValues values) {
-        final Rect clipRect = (Rect) values.values.get(PROPNAME_CLIP);
-        if (clipRect == null) {
-            return (Rect) values.values.get(PROPNAME_BOUNDS);
-        }
-        return clipRect;
-    }
-
-    private static Animator createRectAnimator(final View view, Rect start, Rect end,
-            TransitionValues endValues, TimeInterpolator interpolatorX,
-            TimeInterpolator interpolatorY) {
-        final RectEvaluator evaluator = new RectEvaluator(new Rect());
-        final Rect terminalClip = (Rect) endValues.values.get(PROPNAME_CLIP);
-
-        final ClipDimenProperty propX = new ClipDimenProperty(ClipDimenProperty.TARGET_X);
-        final ObjectAnimator animX = ObjectAnimator.ofObject(view, propX, evaluator, start, end);
-        if (interpolatorX != null) {
-            animX.setInterpolator(interpolatorX);
-        }
-
-        final ClipDimenProperty propY = new ClipDimenProperty(ClipDimenProperty.TARGET_Y);
-        final ObjectAnimator animY = ObjectAnimator.ofObject(view, propY, evaluator, start, end);
-        if (interpolatorY != null) {
-            animY.setInterpolator(interpolatorY);
-        }
-
-        final AnimatorSet animSet = new AnimatorSet();
-        animSet.playTogether(animX, animY);
-        animSet.addListener(new AnimatorListenerAdapter() {
-            @Override
-            public void onAnimationEnd(Animator animation) {
-                view.setClipBounds(terminalClip);
-            }
-        });
-        return animSet;
-    }
-
-    private static class ClipDimenProperty extends Property<View, Rect> {
-        public static final char TARGET_X = 'x';
-        public static final char TARGET_Y = 'y';
-
-        private final Rect mTempRect = new Rect();
-
-        private final int mTargetDimension;
-
-        public ClipDimenProperty(char targetDimension) {
-            super(Rect.class, "clip_bounds_" + targetDimension);
-
-            mTargetDimension = targetDimension;
-        }
-
-        @Override
-        public Rect get(View object) {
-            final Rect tempRect = mTempRect;
-            if (!object.getClipBounds(tempRect)) {
-                tempRect.setEmpty();
-            }
-            return tempRect;
-        }
-
-        @Override
-        public void set(View object, Rect value) {
-            final Rect tempRect = mTempRect;
-            if (object.getClipBounds(tempRect)) {
-                if (mTargetDimension == TARGET_X) {
-                    tempRect.left = value.left;
-                    tempRect.right = value.right;
-                } else {
-                    tempRect.top = value.top;
-                    tempRect.bottom = value.bottom;
-                }
-                object.setClipBounds(tempRect);
-            }
-        }
-    }
-}
diff --git a/core/java/com/android/internal/transition/EpicenterTranslate.java b/core/java/com/android/internal/transition/EpicenterTranslate.java
deleted file mode 100644
index eac3ff8..0000000
--- a/core/java/com/android/internal/transition/EpicenterTranslate.java
+++ /dev/null
@@ -1,191 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.android.internal.transition;
-
-import com.android.internal.R;
-
-import android.animation.Animator;
-import android.animation.AnimatorSet;
-import android.animation.ObjectAnimator;
-import android.animation.TimeInterpolator;
-import android.content.Context;
-import android.content.res.TypedArray;
-import android.graphics.Rect;
-import android.transition.TransitionValues;
-import android.transition.Visibility;
-import android.util.AttributeSet;
-import android.view.View;
-import android.view.ViewGroup;
-import android.view.animation.AnimationUtils;
-
-/**
- * EpicenterTranslate captures the {@link View#getTranslationX()} and
- * {@link View#getTranslationY()} before and after the scene change and
- * animates between those and the epicenter's center during a visibility
- * transition.
- */
-public class EpicenterTranslate extends Visibility {
-    private static final String PROPNAME_BOUNDS = "android:epicenterReveal:bounds";
-    private static final String PROPNAME_TRANSLATE_X = "android:epicenterReveal:translateX";
-    private static final String PROPNAME_TRANSLATE_Y = "android:epicenterReveal:translateY";
-    private static final String PROPNAME_TRANSLATE_Z = "android:epicenterReveal:translateZ";
-    private static final String PROPNAME_Z = "android:epicenterReveal:z";
-
-    private final TimeInterpolator mInterpolatorX;
-    private final TimeInterpolator mInterpolatorY;
-    private final TimeInterpolator mInterpolatorZ;
-
-    public EpicenterTranslate() {
-        mInterpolatorX = null;
-        mInterpolatorY = null;
-        mInterpolatorZ = null;
-    }
-
-    public EpicenterTranslate(Context context, AttributeSet attrs) {
-        super(context, attrs);
-
-        final TypedArray a = context.obtainStyledAttributes(attrs,
-                R.styleable.EpicenterTranslate, 0, 0);
-
-        final int interpolatorX = a.getResourceId(R.styleable.EpicenterTranslate_interpolatorX, 0);
-        if (interpolatorX != 0) {
-            mInterpolatorX = AnimationUtils.loadInterpolator(context, interpolatorX);
-        } else {
-            mInterpolatorX = TransitionConstants.FAST_OUT_SLOW_IN;
-        }
-
-        final int interpolatorY = a.getResourceId(R.styleable.EpicenterTranslate_interpolatorY, 0);
-        if (interpolatorY != 0) {
-            mInterpolatorY = AnimationUtils.loadInterpolator(context, interpolatorY);
-        } else {
-            mInterpolatorY = TransitionConstants.FAST_OUT_SLOW_IN;
-        }
-
-        final int interpolatorZ = a.getResourceId(R.styleable.EpicenterTranslate_interpolatorZ, 0);
-        if (interpolatorZ != 0) {
-            mInterpolatorZ = AnimationUtils.loadInterpolator(context, interpolatorZ);
-        } else {
-            mInterpolatorZ = TransitionConstants.FAST_OUT_SLOW_IN;
-        }
-
-        a.recycle();
-    }
-
-    @Override
-    public void captureStartValues(TransitionValues transitionValues) {
-        super.captureStartValues(transitionValues);
-        captureValues(transitionValues);
-    }
-
-    @Override
-    public void captureEndValues(TransitionValues transitionValues) {
-        super.captureEndValues(transitionValues);
-        captureValues(transitionValues);
-    }
-
-    private void captureValues(TransitionValues values) {
-        final View view = values.view;
-        if (view.getVisibility() == View.GONE) {
-            return;
-        }
-
-        final Rect bounds = new Rect(0, 0, view.getWidth(), view.getHeight());
-        values.values.put(PROPNAME_BOUNDS, bounds);
-        values.values.put(PROPNAME_TRANSLATE_X, view.getTranslationX());
-        values.values.put(PROPNAME_TRANSLATE_Y, view.getTranslationY());
-        values.values.put(PROPNAME_TRANSLATE_Z, view.getTranslationZ());
-        values.values.put(PROPNAME_Z, view.getZ());
-    }
-
-    @Override
-    public Animator onAppear(ViewGroup sceneRoot, View view,
-            TransitionValues startValues, TransitionValues endValues) {
-        if (endValues == null) {
-            return null;
-        }
-
-        final Rect end = (Rect) endValues.values.get(PROPNAME_BOUNDS);
-        final Rect start = getEpicenterOrCenter(end);
-        final float startX = start.centerX() - end.centerX();
-        final float startY = start.centerY() - end.centerY();
-        final float startZ = 0 - (float) endValues.values.get(PROPNAME_Z);
-
-        // Translate the view to be centered on the epicenter.
-        view.setTranslationX(startX);
-        view.setTranslationY(startY);
-        view.setTranslationZ(startZ);
-
-        final float endX = (float) endValues.values.get(PROPNAME_TRANSLATE_X);
-        final float endY = (float) endValues.values.get(PROPNAME_TRANSLATE_Y);
-        final float endZ = (float) endValues.values.get(PROPNAME_TRANSLATE_Z);
-        return createAnimator(view, startX, startY, startZ, endX, endY, endZ,
-                mInterpolatorX, mInterpolatorY, mInterpolatorZ);
-    }
-
-    @Override
-    public Animator onDisappear(ViewGroup sceneRoot, View view,
-            TransitionValues startValues, TransitionValues endValues) {
-        if (startValues == null) {
-            return null;
-        }
-
-        final Rect start = (Rect) endValues.values.get(PROPNAME_BOUNDS);
-        final Rect end = getEpicenterOrCenter(start);
-        final float endX = end.centerX() - start.centerX();
-        final float endY = end.centerY() - start.centerY();
-        final float endZ = 0 - (float) startValues.values.get(PROPNAME_Z);
-
-        final float startX = (float) endValues.values.get(PROPNAME_TRANSLATE_X);
-        final float startY = (float) endValues.values.get(PROPNAME_TRANSLATE_Y);
-        final float startZ = (float) endValues.values.get(PROPNAME_TRANSLATE_Z);
-        return createAnimator(view, startX, startY, startZ, endX, endY, endZ,
-                mInterpolatorX, mInterpolatorY, mInterpolatorZ);
-    }
-
-    private Rect getEpicenterOrCenter(Rect bestRect) {
-        final Rect epicenter = getEpicenter();
-        if (epicenter != null) {
-            return epicenter;
-        }
-
-        final int centerX = bestRect.centerX();
-        final int centerY = bestRect.centerY();
-        return new Rect(centerX, centerY, centerX, centerY);
-    }
-
-    private static Animator createAnimator(final View view, float startX, float startY,
-            float startZ, float endX, float endY, float endZ, TimeInterpolator interpolatorX,
-            TimeInterpolator interpolatorY, TimeInterpolator interpolatorZ) {
-        final ObjectAnimator animX = ObjectAnimator.ofFloat(view, View.TRANSLATION_X, startX, endX);
-        if (interpolatorX != null) {
-            animX.setInterpolator(interpolatorX);
-        }
-
-        final ObjectAnimator animY = ObjectAnimator.ofFloat(view, View.TRANSLATION_Y, startY, endY);
-        if (interpolatorY != null) {
-            animY.setInterpolator(interpolatorY);
-        }
-
-        final ObjectAnimator animZ = ObjectAnimator.ofFloat(view, View.TRANSLATION_Z, startZ, endZ);
-        if (interpolatorZ != null) {
-            animZ.setInterpolator(interpolatorZ);
-        }
-
-        final AnimatorSet animSet = new AnimatorSet();
-        animSet.playTogether(animX, animY, animZ);
-        return animSet;
-    }
-}
diff --git a/core/java/com/android/internal/transition/EpicenterTranslateClipReveal.java b/core/java/com/android/internal/transition/EpicenterTranslateClipReveal.java
new file mode 100644
index 0000000..9d62079
--- /dev/null
+++ b/core/java/com/android/internal/transition/EpicenterTranslateClipReveal.java
@@ -0,0 +1,334 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.internal.transition;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
+import android.animation.TimeInterpolator;
+import android.animation.TypeEvaluator;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Rect;
+import android.transition.TransitionValues;
+import android.transition.Visibility;
+import android.util.AttributeSet;
+import android.util.Property;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.animation.AnimationUtils;
+
+import com.android.internal.R;
+
+/**
+ * EpicenterTranslateClipReveal captures the clip bounds and translation values
+ * before and after the scene change and animates between those and the
+ * epicenter bounds during a visibility transition.
+ */
+public class EpicenterTranslateClipReveal extends Visibility {
+    private static final String PROPNAME_CLIP = "android:epicenterReveal:clip";
+    private static final String PROPNAME_BOUNDS = "android:epicenterReveal:bounds";
+    private static final String PROPNAME_TRANSLATE_X = "android:epicenterReveal:translateX";
+    private static final String PROPNAME_TRANSLATE_Y = "android:epicenterReveal:translateY";
+    private static final String PROPNAME_TRANSLATE_Z = "android:epicenterReveal:translateZ";
+    private static final String PROPNAME_Z = "android:epicenterReveal:z";
+
+    private final TimeInterpolator mInterpolatorX;
+    private final TimeInterpolator mInterpolatorY;
+    private final TimeInterpolator mInterpolatorZ;
+
+    public EpicenterTranslateClipReveal() {
+        mInterpolatorX = null;
+        mInterpolatorY = null;
+        mInterpolatorZ = null;
+    }
+
+    public EpicenterTranslateClipReveal(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        final TypedArray a = context.obtainStyledAttributes(attrs,
+                R.styleable.EpicenterTranslateClipReveal, 0, 0);
+
+        final int interpolatorX = a.getResourceId(
+                R.styleable.EpicenterTranslateClipReveal_interpolatorX, 0);
+        if (interpolatorX != 0) {
+            mInterpolatorX = AnimationUtils.loadInterpolator(context, interpolatorX);
+        } else {
+            mInterpolatorX = TransitionConstants.LINEAR_OUT_SLOW_IN;
+        }
+
+        final int interpolatorY = a.getResourceId(
+                R.styleable.EpicenterTranslateClipReveal_interpolatorY, 0);
+        if (interpolatorY != 0) {
+            mInterpolatorY = AnimationUtils.loadInterpolator(context, interpolatorY);
+        } else {
+            mInterpolatorY = TransitionConstants.FAST_OUT_SLOW_IN;
+        }
+
+        final int interpolatorZ = a.getResourceId(
+                R.styleable.EpicenterTranslateClipReveal_interpolatorZ, 0);
+        if (interpolatorZ != 0) {
+            mInterpolatorZ = AnimationUtils.loadInterpolator(context, interpolatorZ);
+        } else {
+            mInterpolatorZ = TransitionConstants.FAST_OUT_SLOW_IN;
+        }
+
+        a.recycle();
+    }
+
+    @Override
+    public void captureStartValues(TransitionValues transitionValues) {
+        super.captureStartValues(transitionValues);
+        captureValues(transitionValues);
+    }
+
+    @Override
+    public void captureEndValues(TransitionValues transitionValues) {
+        super.captureEndValues(transitionValues);
+        captureValues(transitionValues);
+    }
+
+    private void captureValues(TransitionValues values) {
+        final View view = values.view;
+        if (view.getVisibility() == View.GONE) {
+            return;
+        }
+
+        final Rect bounds = new Rect(0, 0, view.getWidth(), view.getHeight());
+        values.values.put(PROPNAME_BOUNDS, bounds);
+        values.values.put(PROPNAME_TRANSLATE_X, view.getTranslationX());
+        values.values.put(PROPNAME_TRANSLATE_Y, view.getTranslationY());
+        values.values.put(PROPNAME_TRANSLATE_Z, view.getTranslationZ());
+        values.values.put(PROPNAME_Z, view.getZ());
+
+        final Rect clip = view.getClipBounds();
+        values.values.put(PROPNAME_CLIP, clip);
+    }
+
+    @Override
+    public Animator onAppear(ViewGroup sceneRoot, View view,
+            TransitionValues startValues, TransitionValues endValues) {
+        if (endValues == null) {
+            return null;
+        }
+
+        final Rect endBounds = (Rect) endValues.values.get(PROPNAME_BOUNDS);
+        final Rect startBounds = getEpicenterOrCenter(endBounds);
+        final float startX = startBounds.centerX() - endBounds.centerX();
+        final float startY = startBounds.centerY() - endBounds.centerY();
+        final float startZ = 0 - (float) endValues.values.get(PROPNAME_Z);
+
+        // Translate the view to be centered on the epicenter.
+        view.setTranslationX(startX);
+        view.setTranslationY(startY);
+        view.setTranslationZ(startZ);
+
+        final float endX = (float) endValues.values.get(PROPNAME_TRANSLATE_X);
+        final float endY = (float) endValues.values.get(PROPNAME_TRANSLATE_Y);
+        final float endZ = (float) endValues.values.get(PROPNAME_TRANSLATE_Z);
+
+        final Rect endClip = getBestRect(endValues);
+        final Rect startClip = getEpicenterOrCenter(endClip);
+
+        // Prepare the view.
+        view.setClipBounds(startClip);
+
+        final State startStateX = new State(startClip.left, startClip.right, startX);
+        final State endStateX = new State(endClip.left, endClip.right, endX);
+        final State startStateY = new State(startClip.top, startClip.bottom, startY);
+        final State endStateY = new State(endClip.top, endClip.bottom, endY);
+
+        return createRectAnimator(view, startStateX, startStateY, startZ, endStateX, endStateY,
+                endZ, endValues, mInterpolatorX, mInterpolatorY, mInterpolatorZ);
+    }
+
+    @Override
+    public Animator onDisappear(ViewGroup sceneRoot, View view,
+            TransitionValues startValues, TransitionValues endValues) {
+        if (startValues == null) {
+            return null;
+        }
+
+        final Rect startBounds = (Rect) endValues.values.get(PROPNAME_BOUNDS);
+        final Rect endBounds = getEpicenterOrCenter(startBounds);
+        final float endX = endBounds.centerX() - startBounds.centerX();
+        final float endY = endBounds.centerY() - startBounds.centerY();
+        final float endZ = 0 - (float) startValues.values.get(PROPNAME_Z);
+
+        final float startX = (float) endValues.values.get(PROPNAME_TRANSLATE_X);
+        final float startY = (float) endValues.values.get(PROPNAME_TRANSLATE_Y);
+        final float startZ = (float) endValues.values.get(PROPNAME_TRANSLATE_Z);
+
+        final Rect startClip = getBestRect(startValues);
+        final Rect endClip = getEpicenterOrCenter(startClip);
+
+        // Prepare the view.
+        view.setClipBounds(startClip);
+
+        final State startStateX = new State(startClip.left, startClip.right, startX);
+        final State endStateX = new State(endClip.left, endClip.right, endX);
+        final State startStateY = new State(startClip.top, startClip.bottom, startY);
+        final State endStateY = new State(endClip.top, endClip.bottom, endY);
+
+        return createRectAnimator(view, startStateX, startStateY, startZ, endStateX, endStateY,
+                endZ, endValues, mInterpolatorX, mInterpolatorY, mInterpolatorZ);
+    }
+
+    private Rect getEpicenterOrCenter(Rect bestRect) {
+        final Rect epicenter = getEpicenter();
+        if (epicenter != null) {
+            /*
+            // Translate the clip bounds to be centered within the target bounds.
+            final int offsetX = bestRect.centerX() - epicenter.centerX();
+            final int offsetY = bestRect.centerY() - epicenter.centerY();
+            epicenter.offset(offsetX, offsetY);
+            */
+            return epicenter;
+        }
+
+        final int centerX = bestRect.centerX();
+        final int centerY = bestRect.centerY();
+        return new Rect(centerX, centerY, centerX, centerY);
+    }
+
+    private Rect getBestRect(TransitionValues values) {
+        final Rect clipRect = (Rect) values.values.get(PROPNAME_CLIP);
+        if (clipRect == null) {
+            return (Rect) values.values.get(PROPNAME_BOUNDS);
+        }
+        return clipRect;
+    }
+
+    private static Animator createRectAnimator(final View view, State startX, State startY,
+            float startZ, State endX, State endY, float endZ, TransitionValues endValues,
+            TimeInterpolator interpolatorX, TimeInterpolator interpolatorY,
+            TimeInterpolator interpolatorZ) {
+        final StateEvaluator evaluator = new StateEvaluator();
+
+        final ObjectAnimator animZ = ObjectAnimator.ofFloat(view, View.TRANSLATION_Z, startZ, endZ);
+        if (interpolatorZ != null) {
+            animZ.setInterpolator(interpolatorZ);
+        }
+
+        final StateProperty propX = new StateProperty(StateProperty.TARGET_X);
+        final ObjectAnimator animX = ObjectAnimator.ofObject(view, propX, evaluator, startX, endX);
+        if (interpolatorX != null) {
+            animX.setInterpolator(interpolatorX);
+        }
+
+        final StateProperty propY = new StateProperty(StateProperty.TARGET_Y);
+        final ObjectAnimator animY = ObjectAnimator.ofObject(view, propY, evaluator, startY, endY);
+        if (interpolatorY != null) {
+            animY.setInterpolator(interpolatorY);
+        }
+
+        final Rect terminalClip = (Rect) endValues.values.get(PROPNAME_CLIP);
+        final AnimatorListenerAdapter animatorListener = new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                view.setClipBounds(terminalClip);
+            }
+        };
+
+        final AnimatorSet animSet = new AnimatorSet();
+        animSet.playTogether(animX, animY, animZ);
+        animSet.addListener(animatorListener);
+        return animSet;
+    }
+
+    private static class State {
+        int lower;
+        int upper;
+        float trans;
+
+        public State() {}
+
+        public State(int lower, int upper, float trans) {
+            this.lower = lower;
+            this.upper = upper;
+            this.trans = trans;
+        }
+    }
+
+    private static class StateEvaluator implements TypeEvaluator<State> {
+        private final State mTemp = new State();
+
+        @Override
+        public State evaluate(float fraction, State startValue, State endValue) {
+            mTemp.upper = startValue.upper + (int) ((endValue.upper - startValue.upper) * fraction);
+            mTemp.lower = startValue.lower + (int) ((endValue.lower - startValue.lower) * fraction);
+            mTemp.trans = startValue.trans + (int) ((endValue.trans - startValue.trans) * fraction);
+            return mTemp;
+        }
+    }
+
+    private static class StateProperty extends Property<View, State> {
+        public static final char TARGET_X = 'x';
+        public static final char TARGET_Y = 'y';
+
+        private final Rect mTempRect = new Rect();
+        private final State mTempState = new State();
+
+        private final int mTargetDimension;
+
+        public StateProperty(char targetDimension) {
+            super(State.class, "state_" + targetDimension);
+
+            mTargetDimension = targetDimension;
+        }
+
+        @Override
+        public State get(View object) {
+            final Rect tempRect = mTempRect;
+            if (!object.getClipBounds(tempRect)) {
+                tempRect.setEmpty();
+            }
+            final State tempState = mTempState;
+            if (mTargetDimension == TARGET_X) {
+                tempState.trans = object.getTranslationX();
+                tempState.lower = tempRect.left + (int) tempState.trans;
+                tempState.upper = tempRect.right + (int) tempState.trans;
+            } else {
+                tempState.trans = object.getTranslationY();
+                tempState.lower = tempRect.top + (int) tempState.trans;
+                tempState.upper = tempRect.bottom + (int) tempState.trans;
+            }
+            return tempState;
+        }
+
+        @Override
+        public void set(View object, State value) {
+            final Rect tempRect = mTempRect;
+            if (object.getClipBounds(tempRect)) {
+                if (mTargetDimension == TARGET_X) {
+                    tempRect.left = value.lower - (int) value.trans;
+                    tempRect.right = value.upper - (int) value.trans;
+                } else {
+                    tempRect.top = value.lower - (int) value.trans;
+                    tempRect.bottom = value.upper - (int) value.trans;
+                }
+                object.setClipBounds(tempRect);
+            }
+
+            if (mTargetDimension == TARGET_X) {
+                object.setTranslationX(value.trans);
+            } else {
+                object.setTranslationY(value.trans);
+            }
+        }
+    }
+}
diff --git a/core/res/res/transition/popup_window_enter.xml b/core/res/res/transition/popup_window_enter.xml
index 38c41f0..c4c8dac 100644
--- a/core/res/res/transition/popup_window_enter.xml
+++ b/core/res/res/transition/popup_window_enter.xml
@@ -16,17 +16,14 @@
 
 <transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
                android:transitionOrdering="together">
-    <!-- Start from location of epicenter, move to popup location. -->
-    <transition
-        class="com.android.internal.transition.EpicenterTranslate"
-        android:duration="300" />
-
     <!-- Start from size of epicenter, expand to full width/height. -->
     <transition
-        class="com.android.internal.transition.EpicenterClipReveal"
-        android:centerClipBounds="true"
-        android:duration="300" />
+        class="com.android.internal.transition.EpicenterTranslateClipReveal"
+        android:duration="250" />
 
     <!-- Quickly fade in. -->
-    <fade android:duration="100" />
+    <fade
+        android:duration="100"
+        android:fromAlpha="0.1"
+        android:toAlpha="1.0" />
 </transitionSet>
diff --git a/core/res/res/values/attrs.xml b/core/res/res/values/attrs.xml
index 1c4b5f7..eaa6278 100644
--- a/core/res/res/values/attrs.xml
+++ b/core/res/res/values/attrs.xml
@@ -5877,16 +5877,9 @@
     </declare-styleable>
 
     <!-- @hide For internal use only. Use only as directed. -->
-    <declare-styleable name="EpicenterClipReveal">
-        <attr name="centerClipBounds" format="boolean" />
+    <declare-styleable name="EpicenterTranslateClipReveal">
         <attr name="interpolatorX" format="reference" />
         <attr name="interpolatorY" format="reference" />
-    </declare-styleable>
-
-    <!-- @hide For internal use only. Use only as directed. -->
-    <declare-styleable name="EpicenterTranslate">
-        <attr name="interpolatorX" />
-        <attr name="interpolatorY" />
         <attr name="interpolatorZ" format="reference" />
     </declare-styleable>