| /* |
| * 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.ValueAnimator; |
| import android.animation.ValueAnimator.AnimatorUpdateListener; |
| import android.view.View; |
| |
| /** |
| * A convenience class to update a view's visibility state after an alpha animation. |
| */ |
| public class AlphaUpdateListener extends AnimationSuccessListener |
| implements AnimatorUpdateListener { |
| private 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 onAnimationSuccess(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) { |
| view.setVisibility(View.VISIBLE); |
| } |
| } |
| } |