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/*
* Copyright (C) 2019 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.glwallpaper;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import com.android.systemui.Interpolators;
/**
* Use ValueAnimator and appropriate interpolator to control the progress of reveal transition.
* The transition will happen while getting awake and quit events.
*/
class ImageRevealHelper {
private static final String TAG = ImageRevealHelper.class.getSimpleName();
private static final float MAX_REVEAL = 0f;
private static final float MIN_REVEAL = 1f;
private final ValueAnimator mAnimator;
private final RevealStateListener mRevealListener;
private float mReveal = MAX_REVEAL;
private boolean mAwake = false;
ImageRevealHelper(RevealStateListener listener) {
mRevealListener = listener;
mAnimator = ValueAnimator.ofFloat();
mAnimator.setInterpolator(Interpolators.FAST_OUT_SLOW_IN);
mAnimator.addUpdateListener(animator -> {
mReveal = (float) animator.getAnimatedValue();
if (mRevealListener != null) {
mRevealListener.onRevealStateChanged();
}
});
mAnimator.addListener(new AnimatorListenerAdapter() {
private boolean mIsCanceled;
@Override
public void onAnimationCancel(Animator animation) {
mIsCanceled = true;
}
@Override
public void onAnimationEnd(Animator animation) {
if (!mIsCanceled && mRevealListener != null) {
mRevealListener.onRevealEnd();
}
mIsCanceled = false;
}
@Override
public void onAnimationStart(Animator animation) {
if (mRevealListener != null) {
mRevealListener.onRevealStart(true /* animate */);
}
}
});
}
private void animate() {
mAnimator.cancel();
mAnimator.setFloatValues(mReveal, mAwake ? MAX_REVEAL : MIN_REVEAL);
mAnimator.start();
}
public float getReveal() {
return mReveal;
}
void updateAwake(boolean awake, long duration) {
mAwake = awake;
mAnimator.setDuration(duration);
if (duration == 0) {
// We are transiting from home to aod or aod to home directly,
// we don't need to do transition in these cases.
mReveal = mAwake ? MAX_REVEAL : MIN_REVEAL;
mRevealListener.onRevealStart(false /* animate */);
mRevealListener.onRevealStateChanged();
mRevealListener.onRevealEnd();
} else {
animate();
}
}
/**
* A listener to trace value changes of reveal.
*/
public interface RevealStateListener {
/**
* Called back while reveal status changes.
*/
void onRevealStateChanged();
/**
* Called back while reveal starts.
*/
void onRevealStart(boolean animate);
/**
* Called back while reveal ends.
*/
void onRevealEnd();
}
}
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