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
|
/*
* Copyright © 2017-2018 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.widget.fab;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.content.Context;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import com.google.android.material.snackbar.Snackbar;
import androidx.interpolator.view.animation.FastOutSlowInInterpolator;
import android.util.AttributeSet;
import android.view.View;
public class FloatingActionButtonBehavior extends CoordinatorLayout.Behavior<FloatingActionsMenu> {
private static final long ANIMATION_DURATION = 250;
private static final TimeInterpolator FAST_OUT_SLOW_IN_INTERPOLATOR = new FastOutSlowInInterpolator();
public FloatingActionButtonBehavior(final Context context, final AttributeSet attrs) {
super(context, attrs);
}
private static void animateChange(final FloatingActionsMenu child, final float destination, final float fullSpan) {
final float origin = child.getBehaviorYTranslation();
if (Math.abs(destination - origin) < fullSpan / 2) {
child.setBehaviorYTranslation(destination);
return;
}
final ValueAnimator animator = new ValueAnimator();
animator.setFloatValues(origin, destination);
animator.setInterpolator(FAST_OUT_SLOW_IN_INTERPOLATOR);
animator.setDuration((long) (ANIMATION_DURATION * (Math.abs(destination - origin) / fullSpan)));
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(final Animator a) {
child.setBehaviorYTranslation(destination);
}
});
animator.addUpdateListener(a -> child.setBehaviorYTranslation((float) a.getAnimatedValue()));
animator.start();
}
@Override
public boolean layoutDependsOn(final CoordinatorLayout parent, final FloatingActionsMenu child,
final View dependency) {
return dependency instanceof Snackbar.SnackbarLayout;
}
@Override
public boolean onDependentViewChanged(final CoordinatorLayout parent, final FloatingActionsMenu child,
final View dependency) {
animateChange(child, Math.min(0, dependency.getTranslationY() - dependency.getMeasuredHeight()), dependency.getMeasuredHeight());
return true;
}
@Override
public void onDependentViewRemoved(final CoordinatorLayout parent, final FloatingActionsMenu child,
final View dependency) {
animateChange(child, 0, dependency.getMeasuredHeight());
}
}
|