1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3.anim; 18 19 import android.animation.Animator; 20 import android.animation.ValueAnimator; 21 import android.animation.ValueAnimator.AnimatorUpdateListener; 22 import android.view.View; 23 import android.view.ViewGroup; 24 25 /** 26 * A convenience class to update a view's visibility state after an alpha animation. 27 */ 28 public class AlphaUpdateListener extends AnimationSuccessListener 29 implements AnimatorUpdateListener { 30 public static final float ALPHA_CUTOFF_THRESHOLD = 0.01f; 31 32 private View mView; 33 AlphaUpdateListener(View v)34 public AlphaUpdateListener(View v) { 35 mView = v; 36 } 37 38 @Override onAnimationUpdate(ValueAnimator arg0)39 public void onAnimationUpdate(ValueAnimator arg0) { 40 updateVisibility(mView); 41 } 42 43 @Override onAnimationSuccess(Animator animator)44 public void onAnimationSuccess(Animator animator) { 45 updateVisibility(mView); 46 } 47 48 @Override onAnimationStart(Animator arg0)49 public void onAnimationStart(Animator arg0) { 50 // We want the views to be visible for animation, so fade-in/out is visible 51 mView.setVisibility(View.VISIBLE); 52 } 53 updateVisibility(View view)54 public static void updateVisibility(View view) { 55 if (view.getAlpha() < ALPHA_CUTOFF_THRESHOLD && view.getVisibility() != View.INVISIBLE) { 56 view.setVisibility(View.INVISIBLE); 57 } else if (view.getAlpha() > ALPHA_CUTOFF_THRESHOLD 58 && view.getVisibility() != View.VISIBLE) { 59 if (view instanceof ViewGroup) { 60 ViewGroup viewGroup = ((ViewGroup) view); 61 int oldFocusability = viewGroup.getDescendantFocusability(); 62 viewGroup.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS); 63 viewGroup.setVisibility(View.VISIBLE); 64 viewGroup.setDescendantFocusability(oldFocusability); 65 } else { 66 view.setVisibility(View.VISIBLE); 67 } 68 } 69 } 70 }