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

1 files changed, 49 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);
+    }
+}