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/*
* Copyright (C) 2010 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.launcher2;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.util.Log;
/**
* A convenience class for two-way animations, e.g. a fadeIn/fadeOut animation.
* With a regular ValueAnimator, if you call reverse to show the 'out' animation, you'll get
* a frame-by-frame mirror of the 'in' animation -- i.e., the interpolated values will
* be exactly reversed. Using this class, both the 'in' and the 'out' animation use the
* interpolator in the same direction.
*/
public class InterruptibleInOutAnimator extends ValueAnimator {
private long mOriginalDuration;
private Object mOriginalFromValue;
private Object mOriginalToValue;
private boolean mFirstRun = true;
private Object mTag = null;
private static final int STOPPED = 0;
private static final int IN = 1;
private static final int OUT = 2;
private int mDirection = STOPPED;
public InterruptibleInOutAnimator(long duration, Object fromValue, Object toValue) {
super(duration, fromValue, toValue);
mOriginalDuration = duration;
mOriginalFromValue = fromValue;
mOriginalToValue = toValue;
}
private void animate(int direction) {
final long currentPlayTime = getCurrentPlayTime();
final Object toValue = (direction == IN) ? mOriginalToValue : mOriginalFromValue;
final Object startValue = mFirstRun ? mOriginalFromValue : getAnimatedValue();
// Make sure it's stopped before we modify any values
cancel();
if (startValue != toValue) {
mDirection = direction;
setDuration(mOriginalDuration - currentPlayTime);
setValues(startValue, toValue);
start();
mFirstRun = false;
}
}
@Override
public void cancel() {
super.cancel();
mDirection = STOPPED;
}
@Override
public void end() {
super.end();
mDirection = STOPPED;
}
/**
* Return true when the animation is not running and it hasn't even been started.
*/
public boolean isStopped() {
return mDirection == STOPPED;
}
/**
* This is the equivalent of calling Animator.start(), except that it can be called when
* the animation is running in the opposite direction, in which case we reverse
* direction and animate for a correspondingly shorter duration.
*/
public void animateIn() {
animate(IN);
}
/**
* This is the roughly the equivalent of calling Animator.reverse(), except that it uses the
* same interpolation curve as animateIn(), rather than mirroring it. Also, like animateIn(),
* if the animation is currently running in the opposite direction, we reverse
* direction and animate for a correspondingly shorter duration.
*/
public void animateOut() {
animate(OUT);
}
public void setTag(Object tag) {
mTag = tag;
}
public Object getTag() {
return mTag;
}
}
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