content: /*
   * 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.lb.launcher;
  
  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.ViewAnimationUtils;
  import android.view.ViewTreeObserver;
  
  import java.util.HashSet;
  import java.util.WeakHashMap;
  
  public class LauncherAnimUtils {
      static WeakHashMap<Animator, Object> sAnimators = new WeakHashMap<Animator, Object>();
      static Animator.AnimatorListener sEndAnimListener = new Animator.AnimatorListener() {
          public void onAnimationStart(Animator animation) {
              sAnimators.put(animation, null);
          }
  
          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) {
          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.keySet());
          for (Animator a : animators) {
              if (a.isRunning()) {
                  a.cancel();
              }
              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;
      }
  
      public static Animator createCircularReveal(View view, int centerX,
              int centerY, float startRadius, float endRadius) {
          Animator anim = ViewAnimationUtils.createCircularReveal(view, centerX,
                  centerY, startRadius, endRadius);
          if (anim instanceof ValueAnimator) {
              new FirstFrameAnimatorHelper((ValueAnimator) anim, view);
          }
          return anim;
      }
  }
  