/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.anim;
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import android.animation.Animator;
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import android.animation.ValueAnimator;
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import android.animation.ValueAnimator.AnimatorUpdateListener;
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import android.view.View;
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import android.view.ViewGroup;
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/**
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* A convenience class to update a view's visibility state after an alpha animation.
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*/
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public class AlphaUpdateListener extends AnimationSuccessListener
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implements AnimatorUpdateListener {
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private static final float ALPHA_CUTOFF_THRESHOLD = 0.01f;
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private View mView;
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public AlphaUpdateListener(View v) {
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mView = v;
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}
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@Override
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public void onAnimationUpdate(ValueAnimator arg0) {
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updateVisibility(mView);
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}
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@Override
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public void onAnimationSuccess(Animator animator) {
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updateVisibility(mView);
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}
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@Override
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public void onAnimationStart(Animator arg0) {
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// We want the views to be visible for animation, so fade-in/out is visible
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mView.setVisibility(View.VISIBLE);
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}
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public static void updateVisibility(View view) {
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if (view.getAlpha() < ALPHA_CUTOFF_THRESHOLD && view.getVisibility() != View.INVISIBLE) {
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view.setVisibility(View.INVISIBLE);
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} else if (view.getAlpha() > ALPHA_CUTOFF_THRESHOLD
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&& view.getVisibility() != View.VISIBLE) {
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if (view instanceof ViewGroup) {
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ViewGroup viewGroup = ((ViewGroup) view);
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int oldFocusability = viewGroup.getDescendantFocusability();
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viewGroup.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
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viewGroup.setVisibility(View.VISIBLE);
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viewGroup.setDescendantFocusability(oldFocusability);
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} else {
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view.setVisibility(View.VISIBLE);
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}
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}
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}
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}
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