-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
TapHelper.java
71 lines (65 loc) · 2.18 KB
/
TapHelper.java
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
/*
* Copyright 2017 Google LLC
*
* 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.google.ar.core.examples.java.common.helpers;
import android.content.Context;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
/**
* Helper to detect taps using Android GestureDetector, and pass the taps between UI thread and
* render thread.
*/
public final class TapHelper implements OnTouchListener {
private final GestureDetector gestureDetector;
private final BlockingQueue<MotionEvent> queuedSingleTaps = new ArrayBlockingQueue<>(16);
/**
* Creates the tap helper.
*
* @param context the application's context.
*/
public TapHelper(Context context) {
gestureDetector =
new GestureDetector(
context,
new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
// Queue tap if there is space. Tap is lost if queue is full.
queuedSingleTaps.offer(e);
return true;
}
@Override
public boolean onDown(MotionEvent e) {
return true;
}
});
}
/**
* Polls for a tap.
*
* @return if a tap was queued, a MotionEvent for the tap. Otherwise null if no taps are queued.
*/
public MotionEvent poll() {
return queuedSingleTaps.poll();
}
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
return gestureDetector.onTouchEvent(motionEvent);
}
}