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/*
* 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.systemui.statusbar.notification;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.PropertyValuesHolder;
import android.animation.ValueAnimator;
import android.util.Property;
import android.view.View;
import android.view.animation.Interpolator;
import com.android.systemui.animation.Interpolators;
import com.android.systemui.statusbar.notification.stack.AnimationFilter;
import com.android.systemui.statusbar.notification.stack.AnimationProperties;
import com.android.systemui.statusbar.notification.stack.ViewState;
/**
* An animator to animate properties
*/
public class PropertyAnimator {
/**
* Set a property on a view, updating its value, even if it's already animating.
* The @param animated can be used to request an animation.
* If the view isn't animated, this utility will update the current animation if existent,
* such that the end value will point to @param newEndValue or apply it directly if there's
* no animation.
*/
public static <T extends View> void setProperty(final T view,
AnimatableProperty animatableProperty, float newEndValue,
AnimationProperties properties, boolean animated) {
int animatorTag = animatableProperty.getAnimatorTag();
ValueAnimator previousAnimator = ViewState.getChildTag(view, animatorTag);
if (previousAnimator != null || animated) {
startAnimation(view, animatableProperty, newEndValue, animated ? properties : null);
} else {
// no new animation needed, let's just apply the value
animatableProperty.getProperty().set(view, newEndValue);
}
}
public static <T extends View> void startAnimation(final T view,
AnimatableProperty animatableProperty, float newEndValue,
AnimationProperties properties) {
Property<T, Float> property = animatableProperty.getProperty();
int animationStartTag = animatableProperty.getAnimationStartTag();
int animationEndTag = animatableProperty.getAnimationEndTag();
Float previousStartValue = ViewState.getChildTag(view, animationStartTag);
Float previousEndValue = ViewState.getChildTag(view, animationEndTag);
if (previousEndValue != null && previousEndValue == newEndValue) {
return;
}
int animatorTag = animatableProperty.getAnimatorTag();
ValueAnimator previousAnimator = ViewState.getChildTag(view, animatorTag);
AnimationFilter filter = properties != null ? properties.getAnimationFilter() : null;
if (filter == null || !filter.shouldAnimateProperty(property)) {
// just a local update was performed
if (previousAnimator != null) {
// we need to increase all animation keyframes of the previous animator by the
// relative change to the end value
PropertyValuesHolder[] values = previousAnimator.getValues();
float relativeDiff = newEndValue - previousEndValue;
float newStartValue = previousStartValue + relativeDiff;
values[0].setFloatValues(newStartValue, newEndValue);
view.setTag(animationStartTag, newStartValue);
view.setTag(animationEndTag, newEndValue);
previousAnimator.setCurrentPlayTime(previousAnimator.getCurrentPlayTime());
return;
} else {
// no new animation needed, let's just apply the value
property.set(view, newEndValue);
return;
}
}
Float currentValue = property.get(view);
AnimatorListenerAdapter listener = properties.getAnimationFinishListener(property);
if (currentValue.equals(newEndValue)) {
// Skip the animation!
if (previousAnimator != null) {
previousAnimator.cancel();
}
if (listener != null) {
listener.onAnimationEnd(null);
}
return;
}
ValueAnimator animator = ValueAnimator.ofFloat(currentValue, newEndValue);
animator.addUpdateListener(
animation -> property.set(view, (Float) animation.getAnimatedValue()));
Interpolator customInterpolator = properties.getCustomInterpolator(view, property);
Interpolator interpolator = customInterpolator != null ? customInterpolator
: Interpolators.FAST_OUT_SLOW_IN;
animator.setInterpolator(interpolator);
long newDuration = ViewState.cancelAnimatorAndGetNewDuration(properties.duration,
previousAnimator);
animator.setDuration(newDuration);
if (properties.delay > 0 && (previousAnimator == null
|| previousAnimator.getAnimatedFraction() == 0)) {
animator.setStartDelay(properties.delay);
}
if (listener != null) {
animator.addListener(listener);
}
// remove the tag when the animation is finished
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
view.setTag(animatorTag, null);
view.setTag(animationStartTag, null);
view.setTag(animationEndTag, null);
}
});
ViewState.startAnimator(animator, listener);
view.setTag(animatorTag, animator);
view.setTag(animationStartTag, currentValue);
view.setTag(animationEndTag, newEndValue);
}
public static <T extends View> void applyImmediately(T view, AnimatableProperty property,
float newValue) {
cancelAnimation(view, property);
property.getProperty().set(view, newValue);
}
public static void cancelAnimation(View view, AnimatableProperty property) {
ValueAnimator animator = (ValueAnimator) view.getTag(property.getAnimatorTag());
if (animator != null) {
animator.cancel();
}
}
public static boolean isAnimating(View view, AnimatableProperty property) {
return view.getTag(property.getAnimatorTag()) != null;
}
}
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