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/*
* Copyright (C) 2018 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.launcher3.anim;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.view.View;
import android.view.ViewGroup;
/**
* A convenience class to update a view's visibility state after an alpha animation.
*/
public class AlphaUpdateListener extends AnimatorListenerAdapter
implements AnimatorUpdateListener {
public static final float ALPHA_CUTOFF_THRESHOLD = 0.01f;
private View mView;
public AlphaUpdateListener(View v) {
mView = v;
}
@Override
public void onAnimationUpdate(ValueAnimator arg0) {
updateVisibility(mView);
}
@Override
public void onAnimationEnd(Animator animator) {
updateVisibility(mView);
}
@Override
public void onAnimationStart(Animator arg0) {
// We want the views to be visible for animation, so fade-in/out is visible
mView.setVisibility(View.VISIBLE);
}
public static void updateVisibility(View view) {
if (view.getAlpha() < ALPHA_CUTOFF_THRESHOLD && view.getVisibility() != View.INVISIBLE) {
view.setVisibility(View.INVISIBLE);
} else if (view.getAlpha() > ALPHA_CUTOFF_THRESHOLD
&& view.getVisibility() != View.VISIBLE) {
if (view instanceof ViewGroup) {
ViewGroup viewGroup = ((ViewGroup) view);
int oldFocusability = viewGroup.getDescendantFocusability();
viewGroup.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
viewGroup.setVisibility(View.VISIBLE);
viewGroup.setDescendantFocusability(oldFocusability);
} else {
view.setVisibility(View.VISIBLE);
}
}
}
}
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