First commit

app/src/main/java/com/android/launcher2/LauncherAnimUtils.java

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+/*
+ * Copyright (C) 2012 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.launcher2;
+
+import android.animation.Animator;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
+import android.animation.PropertyValuesHolder;
+import android.animation.ValueAnimator;
+import android.view.View;
+import android.view.ViewTreeObserver;
+
+import java.util.HashSet;
+
+public class LauncherAnimUtils {
+    static HashSet<Animator> sAnimators = new HashSet<Animator>();
+    static Animator.AnimatorListener sEndAnimListener = new Animator.AnimatorListener() {
+        public void onAnimationStart(Animator animation) {
+        }
+
+        public void onAnimationRepeat(Animator animation) {
+        }
+
+        public void onAnimationEnd(Animator animation) {
+            sAnimators.remove(animation);
+        }
+
+        public void onAnimationCancel(Animator animation) {
+            sAnimators.remove(animation);
+        }
+    };
+
+    public static void cancelOnDestroyActivity(Animator a) {
+        sAnimators.add(a);
+        a.addListener(sEndAnimListener);
+    }
+
+    // Helper method. Assumes a draw is pending, and that if the animation's duration is 0
+    // it should be cancelled
+    public static void startAnimationAfterNextDraw(final Animator animator, final View view) {
+        view.getViewTreeObserver().addOnDrawListener(new ViewTreeObserver.OnDrawListener() {
+                private boolean mStarted = false;
+                public void onDraw() {
+                    if (mStarted) return;
+                    mStarted = true;
+                    // Use this as a signal that the animation was cancelled
+                    if (animator.getDuration() == 0) {
+                        return;
+                    }
+                    animator.start();
+
+                    final ViewTreeObserver.OnDrawListener listener = this;
+                    view.post(new Runnable() {
+                            public void run() {
+                                view.getViewTreeObserver().removeOnDrawListener(listener);
+                            }
+                        });
+                }
+            });
+    }
+
+    public static void onDestroyActivity() {
+        HashSet<Animator> animators = new HashSet<Animator>(sAnimators);
+        for (Animator a : animators) {
+            if (a.isRunning()) {
+                a.cancel();
+            } else {
+                sAnimators.remove(a);
+            }
+        }
+    }
+
+    public static AnimatorSet createAnimatorSet() {
+        AnimatorSet anim = new AnimatorSet();
+        cancelOnDestroyActivity(anim);
+        return anim;
+    }
+
+    public static ValueAnimator ofFloat(View target, float... values) {
+        ValueAnimator anim = new ValueAnimator();
+        anim.setFloatValues(values);
+        cancelOnDestroyActivity(anim);
+        return anim;
+    }
+
+    public static ObjectAnimator ofFloat(View target, String propertyName, float... values) {
+        ObjectAnimator anim = new ObjectAnimator();
+        anim.setTarget(target);
+        anim.setPropertyName(propertyName);
+        anim.setFloatValues(values);
+        cancelOnDestroyActivity(anim);
+        new FirstFrameAnimatorHelper(anim, target);
+        return anim;
+    }
+
+    public static ObjectAnimator ofPropertyValuesHolder(View target,
+            PropertyValuesHolder... values) {
+        ObjectAnimator anim = new ObjectAnimator();
+        anim.setTarget(target);
+        anim.setValues(values);
+        cancelOnDestroyActivity(anim);
+        new FirstFrameAnimatorHelper(anim, target);
+        return anim;
+    }
+
+    public static ObjectAnimator ofPropertyValuesHolder(Object target,
+            View view, PropertyValuesHolder... values) {
+        ObjectAnimator anim = new ObjectAnimator();
+        anim.setTarget(target);
+        anim.setValues(values);
+        cancelOnDestroyActivity(anim);
+        new FirstFrameAnimatorHelper(anim, view);
+        return anim;
+    }
+}