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/*
* Copyright (C) 2017 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.quickstep;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.util.FloatProperty;
/**
* A mutable float which allows animating the value
*/
public class AnimatedFloat {
public static FloatProperty<AnimatedFloat> VALUE = new FloatProperty<AnimatedFloat>("value") {
@Override
public void setValue(AnimatedFloat obj, float v) {
obj.updateValue(v);
}
@Override
public Float get(AnimatedFloat obj) {
return obj.value;
}
};
private final Runnable mUpdateCallback;
private ObjectAnimator mValueAnimator;
public float value;
public AnimatedFloat(Runnable updateCallback) {
mUpdateCallback = updateCallback;
}
public ObjectAnimator animateToValue(float start, float end) {
cancelAnimation();
mValueAnimator = ObjectAnimator.ofFloat(this, VALUE, start, end);
mValueAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animator) {
if (mValueAnimator == animator) {
mValueAnimator = null;
}
}
});
return mValueAnimator;
}
/**
* Changes the value and calls the callback.
* Note that the value can be directly accessed as well to avoid notifying the callback.
*/
public void updateValue(float v) {
if (Float.compare(v, value) != 0) {
value = v;
mUpdateCallback.run();
}
}
public void cancelAnimation() {
if (mValueAnimator != null) {
mValueAnimator.cancel();
}
}
public void finishAnimation() {
if (mValueAnimator != null && mValueAnimator.isRunning()) {
mValueAnimator.end();
}
}
public ObjectAnimator getCurrentAnimation() {
return mValueAnimator;
}
}
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