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 17package com.android.launcher3.anim; 18 19import android.animation.Animator; 20import android.animation.ValueAnimator; 21import android.animation.ValueAnimator.AnimatorUpdateListener; 22import android.view.View; 23 24/** 25 * A convenience class to update a view's visibility state after an alpha animation. 26 */ 27public class AlphaUpdateListener extends AnimationSuccessListener 28 implements AnimatorUpdateListener { 29 private static final float ALPHA_CUTOFF_THRESHOLD = 0.01f; 30 31 private View mView; 32 33 public AlphaUpdateListener(View v) { 34 mView = v; 35 } 36 37 @Override 38 public void onAnimationUpdate(ValueAnimator arg0) { 39 updateVisibility(mView); 40 } 41 42 @Override 43 public void onAnimationSuccess(Animator animator) { 44 updateVisibility(mView); 45 } 46 47 @Override 48 public void onAnimationStart(Animator arg0) { 49 // We want the views to be visible for animation, so fade-in/out is visible 50 mView.setVisibility(View.VISIBLE); 51 } 52 53 public static void updateVisibility(View view) { 54 if (view.getAlpha() < ALPHA_CUTOFF_THRESHOLD && view.getVisibility() != View.INVISIBLE) { 55 view.setVisibility(View.INVISIBLE); 56 } else if (view.getAlpha() > ALPHA_CUTOFF_THRESHOLD 57 && view.getVisibility() != View.VISIBLE) { 58 view.setVisibility(View.VISIBLE); 59 } 60 } 61}