1 /*
2  * Copyright (C) 2020 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.wm.shell.animation;
18 
19 import android.graphics.Path;
20 import android.view.animation.Interpolator;
21 import android.view.animation.LinearInterpolator;
22 import android.view.animation.PathInterpolator;
23 
24 /**
25  * Common interpolators used in wm shell library.
26  */
27 public class Interpolators {
28 
29     public static final Interpolator LINEAR = new LinearInterpolator();
30 
31     /**
32      * Interpolator for alpha in animation.
33      */
34     public static final Interpolator ALPHA_IN = new PathInterpolator(0.4f, 0f, 1f, 1f);
35 
36     /**
37      * Interpolator for alpha out animation.
38      */
39     public static final Interpolator ALPHA_OUT = new PathInterpolator(0f, 0f, 0.8f, 1f);
40 
41     /**
42      * Interpolator for fast out linear in animation.
43      */
44     public static final Interpolator FAST_OUT_LINEAR_IN = new PathInterpolator(0.4f, 0f, 1f, 1f);
45 
46     /**
47      * Interpolator for fast out slow in animation.
48      */
49     public static final Interpolator FAST_OUT_SLOW_IN = new PathInterpolator(0.4f, 0f, 0.2f, 1f);
50 
51     /**
52      * Interpolator for linear out slow in animation.
53      */
54     public static final Interpolator LINEAR_OUT_SLOW_IN = new PathInterpolator(0f, 0f, 0.2f, 1f);
55 
56     /**
57      * The default emphasized interpolator. Used for hero / emphasized movement of content.
58      */
59     public static final Interpolator EMPHASIZED = createEmphasizedInterpolator();
60 
61     /**
62      * The accelerated emphasized interpolator. Used for hero / emphasized movement of content that
63      * is disappearing e.g. when moving off screen.
64      */
65     public static final Interpolator EMPHASIZED_ACCELERATE = new PathInterpolator(
66             0.3f, 0f, 0.8f, 0.15f);
67 
68     /**
69      * The decelerating emphasized interpolator. Used for hero / emphasized movement of content that
70      * is appearing e.g. when coming from off screen
71      */
72     public static final Interpolator EMPHASIZED_DECELERATE = new PathInterpolator(
73             0.05f, 0.7f, 0.1f, 1f);
74     /**
75      * Interpolator to be used when animating a move based on a click. Pair with enough duration.
76      */
77     public static final Interpolator TOUCH_RESPONSE = new PathInterpolator(0.3f, 0f, 0.1f, 1f);
78 
79     /**
80      * Interpolator to be used when animating a panel closing.
81      */
82     public static final Interpolator PANEL_CLOSE_ACCELERATED =
83             new PathInterpolator(0.3f, 0, 0.5f, 1);
84 
85     public static final PathInterpolator SLOWDOWN_INTERPOLATOR =
86             new PathInterpolator(0.5f, 1f, 0.5f, 1f);
87 
88     public static final PathInterpolator DIM_INTERPOLATOR =
89             new PathInterpolator(.23f, .87f, .52f, -0.11f);
90 
91     // Create the default emphasized interpolator
createEmphasizedInterpolator()92     private static PathInterpolator createEmphasizedInterpolator() {
93         Path path = new Path();
94         // Doing the same as fast_out_extra_slow_in
95         path.moveTo(0f, 0f);
96         path.cubicTo(0.05f, 0f, 0.133333f, 0.06f, 0.166666f, 0.4f);
97         path.cubicTo(0.208333f, 0.82f, 0.25f, 1f, 1f, 1f);
98         return new PathInterpolator(path);
99     }
100 }
101