Make sure all transition components run on the same thread

-> The framework circular reveal transition runs on the render
   thread which can cause problems when mixed in an AnimatorSet
   with transitions that don't run on the render thread
-> See issue 17556455

issue 21445293

Change-Id: Ie19c184c55060651e817d426ec83049b06af56ba

2 files changed, 104 insertions, 0 deletions

diff --git a/src/com/android/launcher3/util/RevealOutlineProvider.java b/src/com/android/launcher3/util/RevealOutlineProvider.java
new file mode 100644
index 000000000..0db3984f8
--- /dev/null
+++ b/src/com/android/launcher3/util/RevealOutlineProvider.java
@@ -0,0 +1,49 @@
+package com.android.launcher3.util;
+
+import android.annotation.TargetApi;
+import android.graphics.Outline;
+import android.graphics.Rect;
+import android.os.Build;
+import android.view.View;
+import android.view.ViewOutlineProvider;
+
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class RevealOutlineProvider extends ViewOutlineProvider {
+
+    private int mCenterX;
+    private int mCenterY;
+    private float mRadius0;
+    private float mRadius1;
+    private int mCurrentRadius;
+
+    private final Rect mOval;
+
+    /**
+     * @param x reveal center x
+     * @param y reveal center y
+     * @param r0 initial radius
+     * @param r1 final radius
+     */
+    public RevealOutlineProvider(int x, int y, float r0, float r1) {
+        mCenterX = x;
+        mCenterY = y;
+        mRadius0 = r0;
+        mRadius1 = r1;
+
+        mOval = new Rect();
+    }
+
+    public void setProgress(float progress) {
+        mCurrentRadius = (int) ((1 - progress) * mRadius0 + progress * mRadius1);
+
+        mOval.left = mCenterX - mCurrentRadius;
+        mOval.top = mCenterY - mCurrentRadius;
+        mOval.right = mCenterX + mCurrentRadius;
+        mOval.bottom = mCenterY + mCurrentRadius;
+    }
+
+    @Override
+    public void getOutline(View v, Outline outline) {
+        outline.setRoundRect(mOval, mCurrentRadius);
+    }
+}
diff --git a/src/com/android/launcher3/util/UiThreadCircularReveal.java b/src/com/android/launcher3/util/UiThreadCircularReveal.java
new file mode 100644
index 000000000..c7324fb1b
--- /dev/null
+++ b/src/com/android/launcher3/util/UiThreadCircularReveal.java
@@ -0,0 +1,55 @@
+package com.android.launcher3.util;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.ValueAnimator;
+import android.animation.ValueAnimator.AnimatorUpdateListener;
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.view.View;
+import android.view.ViewOutlineProvider;
+
+import com.android.launcher3.Utilities;
+
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class UiThreadCircularReveal {
+
+    public static ValueAnimator createCircularReveal(View v, int x, int y, float r0, float r1) {
+        ValueAnimator va = ValueAnimator.ofFloat(0f, 1f);
+
+        final View revealView = v;
+        final RevealOutlineProvider outlineProvider = new RevealOutlineProvider(x, y, r0, r1);
+        final ViewOutlineProvider originalProvider = revealView.getOutlineProvider();
+        final float elevation = v.getElevation();
+
+        va.addListener(new AnimatorListenerAdapter() {
+            public void onAnimationStart(Animator animation) {
+                revealView.setOutlineProvider(outlineProvider);
+                revealView.setClipToOutline(true);
+                revealView.setTranslationZ(-elevation);
+            }
+
+            public void onAnimationEnd(Animator animation) {
+                revealView.setOutlineProvider(originalProvider);
+                revealView.setClipToOutline(false);
+                revealView.setTranslationZ(0);
+            }
+
+        });
+
+        va.addUpdateListener(new AnimatorUpdateListener() {
+            @Override
+            public void onAnimationUpdate(ValueAnimator arg0) {
+                float progress = arg0.getAnimatedFraction();
+                outlineProvider.setProgress(progress);
+                if (Utilities.isLmpMR1OrAbove()) {
+                    revealView.invalidateOutline();
+                } else {
+                    // On L, a bug requires calling a full view invalidate.
+                    revealView.invalidate();
+                }
+            }
+        });
+        return va;
+    }
+}