1 files changed, 57 insertions, 0 deletions
diff --git a/src/com/android/launcher3/util/UiThreadCircularReveal.java b/src/com/android/launcher3/util/UiThreadCircularReveal.java
new file mode 100644
index 000000000..3ca3aeeee
--- /dev/null
+++ b/src/com/android/launcher3/util/UiThreadCircularReveal.java
@@ -0,0 +1,57 @@
+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) {
+        return createCircularReveal(v, x, y, r0, r1, ViewOutlineProvider.BACKGROUND);
+    }
+
+    public static ValueAnimator createCircularReveal(View v, int x, int y, float r0, float r1,
+            final ViewOutlineProvider originalProvider) {
+        ValueAnimator va = ValueAnimator.ofFloat(0f, 1f);
+
+        final View revealView = v;
+        final RevealOutlineProvider outlineProvider = new RevealOutlineProvider(x, y, r0, r1);
+        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);
+                revealView.invalidateOutline();
+                if (!Utilities.isLmpMR1OrAbove()) {
+                    revealView.invalidate();
+                }
+            }
+        });
+        return va;
+    }
+}