Add RevealAnimator
Expose this as a ValueAnimator throught a new API as
View.createRevealAnimator().
Change-Id: Ia6aac452988f001023478ee1ca0f268960e23f25
diff --git a/core/java/android/animation/RevealAnimator.java b/core/java/android/animation/RevealAnimator.java
new file mode 100644
index 0000000..77a536a
--- /dev/null
+++ b/core/java/android/animation/RevealAnimator.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2014 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 android.animation;
+
+import android.view.View;
+
+import java.util.ArrayList;
+
+/**
+ * Reveals a View with an animated clipping circle.
+ * The clipping is implemented efficiently by talking to a private reveal API on View.
+ * This hidden class currently only accessed by the {@link android.view.View}.
+ *
+ * @hide
+ */
+public class RevealAnimator extends ValueAnimator {
+ private final static String LOGTAG = "RevealAnimator";
+ private ValueAnimator.AnimatorListener mListener;
+ private ValueAnimator.AnimatorUpdateListener mUpdateListener;
+ private RevealCircle mReuseRevealCircle = new RevealCircle(0);
+ private RevealAnimator(final View clipView, final int x, final int y,
+ float startRadius, float endRadius, final boolean inverseClip) {
+
+ setObjectValues(new RevealCircle(startRadius), new RevealCircle(endRadius));
+ setEvaluator(new RevealCircleEvaluator(mReuseRevealCircle));
+
+ mUpdateListener = new ValueAnimator.AnimatorUpdateListener() {
+ @Override
+ public void onAnimationUpdate(ValueAnimator animation) {
+ RevealCircle circle = (RevealCircle) animation.getAnimatedValue();
+ float radius = circle.getRadius();
+ clipView.setRevealClip(true, inverseClip, x, y, radius);
+ }
+ };
+ mListener = new AnimatorListenerAdapter() {
+ @Override
+ public void onAnimationCancel(Animator animation) {
+ clipView.setRevealClip(false, false, 0, 0, 0);
+ }
+
+ @Override
+ public void onAnimationEnd(Animator animation) {
+ clipView.setRevealClip(false, false, 0, 0, 0);
+ }
+ };
+ addUpdateListener(mUpdateListener);
+ addListener(mListener);
+ }
+
+ public static RevealAnimator ofRevealCircle(View clipView, int x, int y,
+ float startRadius, float endRadius, boolean inverseClip) {
+ RevealAnimator anim = new RevealAnimator(clipView, x, y,
+ startRadius, endRadius, inverseClip);
+ return anim;
+ }
+
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public void removeAllUpdateListeners() {
+ super.removeAllUpdateListeners();
+ addUpdateListener(mUpdateListener);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public void removeAllListeners() {
+ super.removeAllListeners();
+ addListener(mListener);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public ArrayList<AnimatorListener> getListeners() {
+ ArrayList<AnimatorListener> allListeners =
+ (ArrayList<AnimatorListener>) super.getListeners().clone();
+ allListeners.remove(mListener);
+ return allListeners;
+ }
+
+ private class RevealCircle {
+ float mRadius;
+
+ public RevealCircle(float radius) {
+ mRadius = radius;
+ }
+
+ public void setRadius(float radius) {
+ mRadius = radius;
+ }
+
+ public float getRadius() {
+ return mRadius;
+ }
+ }
+
+ private class RevealCircleEvaluator implements TypeEvaluator<RevealCircle> {
+
+ private RevealCircle mRevealCircle;
+
+ public RevealCircleEvaluator() {
+ }
+
+ public RevealCircleEvaluator(RevealCircle reuseCircle) {
+ mRevealCircle = reuseCircle;
+ }
+
+ @Override
+ public RevealCircle evaluate(float fraction, RevealCircle startValue,
+ RevealCircle endValue) {
+ float currentRadius = startValue.mRadius
+ + ((endValue.mRadius - startValue.mRadius) * fraction);
+ if (mRevealCircle == null) {
+ return new RevealCircle(currentRadius);
+ } else {
+ mRevealCircle.setRadius(currentRadius);
+ return mRevealCircle;
+ }
+ }
+ }
+}