1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/*
* Copyright (C) 2010 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.launcher2;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.util.Log;
/**
* A convenience class for two-way animations, e.g. a fadeIn/fadeOut animation.
* With a regular ValueAnimator, if you call reverse to show the 'out' animation, you'll get
* a frame-by-frame mirror of the 'in' animation -- i.e., the interpolated values will
* be exactly reversed. Using this class, both the 'in' and the 'out' animation use the
* interpolator in the same direction.
*/
public class InterruptibleInOutAnimator {
private long mOriginalDuration;
private float mOriginalFromValue;
private float mOriginalToValue;
private ValueAnimator mAnimator;
private boolean mFirstRun = true;
private Object mTag = null;
private static final int STOPPED = 0;
private static final int IN = 1;
private static final int OUT = 2;
private int mDirection = STOPPED;
public InterruptibleInOutAnimator(long duration, float fromValue, float toValue) {
mAnimator = ValueAnimator.ofFloat(fromValue, toValue).setDuration(duration);
mOriginalDuration = duration;
mOriginalFromValue = fromValue;
mOriginalToValue = toValue;
}
private void animate(int direction) {
final long currentPlayTime = mAnimator.getCurrentPlayTime();
final float toValue = (direction == IN) ? mOriginalToValue : mOriginalFromValue;
final float startValue = mFirstRun ? mOriginalFromValue :
((Float) mAnimator.getAnimatedValue()).floatValue();
// Make sure it's stopped before we modify any values
cancel();
if (startValue != toValue) {
mDirection = direction;
mAnimator.setDuration(mOriginalDuration - currentPlayTime);
mAnimator.setFloatValues(startValue, toValue);
mAnimator.start();
mFirstRun = false;
}
}
public void cancel() {
mAnimator.cancel();
mDirection = STOPPED;
}
public void end() {
mAnimator.end();
mDirection = STOPPED;
}
/**
* Return true when the animation is not running and it hasn't even been started.
*/
public boolean isStopped() {
return mDirection == STOPPED;
}
/**
* This is the equivalent of calling Animator.start(), except that it can be called when
* the animation is running in the opposite direction, in which case we reverse
* direction and animate for a correspondingly shorter duration.
*/
public void animateIn() {
animate(IN);
}
/**
* This is the roughly the equivalent of calling Animator.reverse(), except that it uses the
* same interpolation curve as animateIn(), rather than mirroring it. Also, like animateIn(),
* if the animation is currently running in the opposite direction, we reverse
* direction and animate for a correspondingly shorter duration.
*/
public void animateOut() {
animate(OUT);
}
public void setTag(Object tag) {
mTag = tag;
}
public Object getTag() {
return mTag;
}
public ValueAnimator getAnimator() {
return mAnimator;
}
}
|
