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/*
* Copyright (C) 2015 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 android.support.design.widget;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.util.StateSet;
import java.util.ArrayList;
final class StateListAnimator {
private final ArrayList<Tuple> mTuples = new ArrayList<>();
private Tuple mLastMatch = null;
ValueAnimator mRunningAnimator = null;
private final ValueAnimator.AnimatorListener mAnimationListener =
new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animator) {
if (mRunningAnimator == animator) {
mRunningAnimator = null;
}
}
};
/**
* Associates the given Animation with the provided drawable state specs so that it will be run
* when the View's drawable state matches the specs.
*
* @param specs The drawable state specs to match against
* @param animator The animator to run when the specs match
*/
public void addState(int[] specs, ValueAnimator animator) {
Tuple tuple = new Tuple(specs, animator);
animator.addListener(mAnimationListener);
mTuples.add(tuple);
}
/**
* Called by View
*/
void setState(int[] state) {
Tuple match = null;
final int count = mTuples.size();
for (int i = 0; i < count; i++) {
final Tuple tuple = mTuples.get(i);
if (StateSet.stateSetMatches(tuple.mSpecs, state)) {
match = tuple;
break;
}
}
if (match == mLastMatch) {
return;
}
if (mLastMatch != null) {
cancel();
}
mLastMatch = match;
if (match != null) {
start(match);
}
}
private void start(Tuple match) {
mRunningAnimator = match.mAnimator;
mRunningAnimator.start();
}
private void cancel() {
if (mRunningAnimator != null) {
mRunningAnimator.cancel();
mRunningAnimator = null;
}
}
/**
* If there is an animation running for a recent state change, ends it.
*
* <p>This causes the animation to assign the end value(s) to the View.</p>
*/
public void jumpToCurrentState() {
if (mRunningAnimator != null) {
mRunningAnimator.end();
mRunningAnimator = null;
}
}
static class Tuple {
final int[] mSpecs;
final ValueAnimator mAnimator;
Tuple(int[] specs, ValueAnimator animator) {
mSpecs = specs;
mAnimator = animator;
}
}
}
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