1 /*
2  * Copyright (C) 2016 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.TimeInterpolator;
21 import android.util.FloatProperty;
22 import android.util.IntProperty;
23 import android.view.View;
24 
25 /**
26  * Utility class for setting a property with or without animation
27  */
28 public interface PropertySetter {
29 
30     PropertySetter NO_ANIM_PROPERTY_SETTER = new PropertySetter() { };
31 
32     /**
33      * Sets the view alpha using the provided interpolator.
34      * Unlike {@link #setFloat}, this also updates the visibility of the view as alpha changes
35      * between zero and non-zero.
36      */
setViewAlpha(View view, float alpha, TimeInterpolator interpolator)37     default void setViewAlpha(View view, float alpha, TimeInterpolator interpolator) {
38         if (view != null) {
39             view.setAlpha(alpha);
40             AlphaUpdateListener.updateVisibility(view);
41         }
42     }
43 
44     /**
45      * Sets the background color of the provided view using the provided interpolator.
46      */
setViewBackgroundColor(View view, int color, TimeInterpolator interpolator)47     default void setViewBackgroundColor(View view, int color, TimeInterpolator interpolator) {
48         if (view != null) {
49             view.setBackgroundColor(color);
50         }
51     }
52 
53     /**
54      * Updates the float property of the target using the provided interpolator
55      */
setFloat(T target, FloatProperty<T> property, float value, TimeInterpolator interpolator)56     default <T> void setFloat(T target, FloatProperty<T> property, float value,
57             TimeInterpolator interpolator) {
58         property.setValue(target, value);
59     }
60 
61     /**
62      * Updates the int property of the target using the provided interpolator
63      */
setInt(T target, IntProperty<T> property, int value, TimeInterpolator interpolator)64     default <T> void setInt(T target, IntProperty<T> property, int value,
65             TimeInterpolator interpolator) {
66         property.setValue(target, value);
67     }
68 
add(Animator animatorSet)69     default void add(Animator animatorSet) {
70         animatorSet.setDuration(0);
71         animatorSet.start();
72     }
73 }
74