content: /*
   * Copyright (C) 2016 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.launcher3.anim;
  
  import android.animation.Animator;
  import android.animation.ObjectAnimator;
  import android.animation.TimeInterpolator;
  import android.util.Property;
  import android.view.View;
  
  /**
   * Utility class for setting a property with or without animation
   */
  public class PropertySetter {
  
      public static final PropertySetter NO_ANIM_PROPERTY_SETTER = new PropertySetter();
  
      public void setViewAlpha(View view, float alpha, TimeInterpolator interpolator) {
          if (view != null) {
              view.setAlpha(alpha);
              AlphaUpdateListener.updateVisibility(view);
          }
      }
  
      public <T> void setFloat(T target, Property<T, Float> property, float value,
              TimeInterpolator interpolator) {
          property.set(target, value);
      }
  
      public <T> void setInt(T target, Property<T, Integer> property, int value,
              TimeInterpolator interpolator) {
          property.set(target, value);
      }
  
      public static class AnimatedPropertySetter extends PropertySetter {
  
          private final long mDuration;
          private final AnimatorSetBuilder mStateAnimator;
  
          public AnimatedPropertySetter(long duration, AnimatorSetBuilder builder) {
              mDuration = duration;
              mStateAnimator = builder;
          }
  
          @Override
          public void setViewAlpha(View view, float alpha, TimeInterpolator interpolator) {
              if (view == null || view.getAlpha() == alpha) {
                  return;
              }
              ObjectAnimator anim = ObjectAnimator.ofFloat(view, View.ALPHA, alpha);
              anim.addListener(new AlphaUpdateListener(view));
              anim.setDuration(mDuration).setInterpolator(interpolator);
              mStateAnimator.play(anim);
          }
  
          @Override
          public <T> void setFloat(T target, Property<T, Float> property, float value,
                  TimeInterpolator interpolator) {
              if (property.get(target) == value) {
                  return;
              }
              Animator anim = ObjectAnimator.ofFloat(target, property, value);
              anim.setDuration(mDuration).setInterpolator(interpolator);
              mStateAnimator.play(anim);
          }
  
          @Override
          public <T> void setInt(T target, Property<T, Integer> property, int value,
                  TimeInterpolator interpolator) {
              if (property.get(target) == value) {
                  return;
              }
              Animator anim = ObjectAnimator.ofInt(target, property, value);
              anim.setDuration(mDuration).setInterpolator(interpolator);
              mStateAnimator.play(anim);
          }
      }
  }
  