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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.systemui.statusbar.notification;
     18 
     19 import android.animation.Animator;
     20 import android.animation.AnimatorListenerAdapter;
     21 import android.animation.PropertyValuesHolder;
     22 import android.animation.ValueAnimator;
     23 import android.util.Property;
     24 import android.view.View;
     25 import android.view.animation.Interpolator;
     26 
     27 import com.android.systemui.Interpolators;
     28 import com.android.systemui.statusbar.stack.AnimationFilter;
     29 import com.android.systemui.statusbar.stack.AnimationProperties;
     30 import com.android.systemui.statusbar.stack.ViewState;
     31 
     32 /**
     33  * An animator to animate properties
     34  */
     35 public class PropertyAnimator {
     36 
     37     public static <T extends View> void startAnimation(final T view,
     38             AnimatableProperty animatableProperty, float newEndValue,
     39             AnimationProperties properties) {
     40         Property<T, Float> property = animatableProperty.getProperty();
     41         int animationStartTag = animatableProperty.getAnimationStartTag();
     42         int animationEndTag = animatableProperty.getAnimationEndTag();
     43         Float previousStartValue = ViewState.getChildTag(view, animationStartTag);
     44         Float previousEndValue = ViewState.getChildTag(view, animationEndTag);
     45         if (previousEndValue != null && previousEndValue == newEndValue) {
     46             return;
     47         }
     48         int animatorTag = animatableProperty.getAnimatorTag();
     49         ValueAnimator previousAnimator = ViewState.getChildTag(view, animatorTag);
     50         AnimationFilter filter = properties.getAnimationFilter();
     51         if (!filter.shouldAnimateProperty(property)) {
     52             // just a local update was performed
     53             if (previousAnimator != null) {
     54                 // we need to increase all animation keyframes of the previous animator by the
     55                 // relative change to the end value
     56                 PropertyValuesHolder[] values = previousAnimator.getValues();
     57                 float relativeDiff = newEndValue - previousEndValue;
     58                 float newStartValue = previousStartValue + relativeDiff;
     59                 values[0].setFloatValues(newStartValue, newEndValue);
     60                 view.setTag(animationStartTag, newStartValue);
     61                 view.setTag(animationEndTag, newEndValue);
     62                 previousAnimator.setCurrentPlayTime(previousAnimator.getCurrentPlayTime());
     63                 return;
     64             } else {
     65                 // no new animation needed, let's just apply the value
     66                 property.set(view, newEndValue);
     67                 return;
     68             }
     69         }
     70 
     71         Float currentValue = property.get(view);
     72         ValueAnimator animator = ValueAnimator.ofFloat(currentValue, newEndValue);
     73         animator.addUpdateListener(
     74                 animation -> property.set(view, (Float) animation.getAnimatedValue()));
     75         Interpolator customInterpolator = properties.getCustomInterpolator(view, property);
     76         Interpolator interpolator =  customInterpolator != null ? customInterpolator
     77                 : Interpolators.FAST_OUT_SLOW_IN;
     78         animator.setInterpolator(interpolator);
     79         long newDuration = ViewState.cancelAnimatorAndGetNewDuration(properties.duration,
     80                 previousAnimator);
     81         animator.setDuration(newDuration);
     82         if (properties.delay > 0 && (previousAnimator == null
     83                 || previousAnimator.getAnimatedFraction() == 0)) {
     84             animator.setStartDelay(properties.delay);
     85         }
     86         AnimatorListenerAdapter listener = properties.getAnimationFinishListener();
     87         if (listener != null) {
     88             animator.addListener(listener);
     89         }
     90         // remove the tag when the animation is finished
     91         animator.addListener(new AnimatorListenerAdapter() {
     92             @Override
     93             public void onAnimationEnd(Animator animation) {
     94                 view.setTag(animatorTag, null);
     95                 view.setTag(animationStartTag, null);
     96                 view.setTag(animationEndTag, null);
     97             }
     98         });
     99         ViewState.startAnimator(animator, listener);
    100         view.setTag(animatorTag, animator);
    101         view.setTag(animationStartTag, currentValue);
    102         view.setTag(animationEndTag, newEndValue);
    103     }
    104 
    105     public interface AnimatableProperty {
    106         int getAnimationStartTag();
    107         int getAnimationEndTag();
    108         int getAnimatorTag();
    109         Property getProperty();
    110     }
    111 }
    112