1 /*
2  * Copyright (C) 2021 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 package com.android.launcher3.anim;
17 
18 import static com.android.launcher3.LauncherAnimUtils.SUCCESS_TRANSITION_PROGRESS;
19 
20 import android.animation.Animator;
21 import android.animation.Animator.AnimatorListener;
22 import android.animation.AnimatorListenerAdapter;
23 import android.animation.ValueAnimator;
24 
25 import java.util.function.Consumer;
26 
27 /**
28  * Utility class for creating common {@link AnimatorListener}
29  */
30 public class AnimatorListeners {
31 
32     /**
33      * Returns an AnimatorListener which executes the callback on successful animation completion
34      */
forSuccessCallback(Runnable callback)35     public static AnimatorListener forSuccessCallback(Runnable callback) {
36         return new RunnableSuccessListener(callback);
37     }
38 
39     /**
40      * Returns an AnimatorListener which executes the callback on animation completion,
41      * with the boolean representing success
42      */
forEndCallback(Consumer<Boolean> callback)43     public static AnimatorListener forEndCallback(Consumer<Boolean> callback) {
44         return new EndStateCallbackWrapper(callback);
45     }
46 
47     /**
48      * Returns an AnimatorListener which executes the callback on animation completion
49      */
forEndCallback(Runnable callback)50     public static AnimatorListener forEndCallback(Runnable callback) {
51         return new AnimatorListenerAdapter() {
52             @Override
53             public void onAnimationEnd(Animator animation) {
54                 callback.run();
55             }
56         };
57     }
58 
59     private static class EndStateCallbackWrapper extends AnimatorListenerAdapter {
60 
61         private final Consumer<Boolean> mListener;
62         private boolean mListenerCalled = false;
63 
64         EndStateCallbackWrapper(Consumer<Boolean> listener) {
65             mListener = listener;
66         }
67 
68         @Override
69         public void onAnimationCancel(Animator animation) {
70             if (!mListenerCalled) {
71                 mListenerCalled = true;
72                 mListener.accept(false);
73             }
74         }
75 
76         @Override
77         public void onAnimationEnd(Animator anim) {
78             if (!mListenerCalled) {
79                 mListenerCalled = true;
80                 mListener.accept(anim instanceof ValueAnimator
81                         ? ((ValueAnimator) anim).getAnimatedFraction() > SUCCESS_TRANSITION_PROGRESS
82                         : true);
83             }
84         }
85     }
86 
87     private static class RunnableSuccessListener extends AnimationSuccessListener {
88 
89         private final Runnable mRunnable;
90 
91         private RunnableSuccessListener(Runnable r) {
92             mRunnable = r;
93         }
94 
95         @Override
96         public void onAnimationSuccess(Animator animator) {
97             mRunnable.run();
98         }
99     }
100 }
101