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
122
123
124
125
126
|
/*
* 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 android.view;
import android.os.MessageQueue;
import android.util.Slog;
/**
* An input queue provides a mechanism for an application to receive incoming
* input events sent over an input channel. Signalling is implemented by MessageQueue.
* @hide
*/
public final class InputQueue {
private static final String TAG = "InputQueue";
// Describes the interpretation of an event.
// XXX This concept is tentative. See comments in android/input.h.
public static final int INPUT_EVENT_NATURE_KEY = 1;
public static final int INPUT_EVENT_NATURE_TOUCH = 2;
public static final int INPUT_EVENT_NATURE_TRACKBALL = 3;
private static Object sLock = new Object();
private static native void nativeRegisterInputChannel(InputChannel inputChannel,
InputHandler inputHandler, MessageQueue messageQueue);
private static native void nativeUnregisterInputChannel(InputChannel inputChannel);
private static native void nativeFinished(long finishedToken);
private InputQueue() {
}
/**
* Registers an input channel and handler.
* @param inputChannel The input channel to register.
* @param inputHandler The input handler to input events send to the target.
* @param messageQueue The message queue on whose thread the handler should be invoked.
*/
public static void registerInputChannel(InputChannel inputChannel, InputHandler inputHandler,
MessageQueue messageQueue) {
if (inputChannel == null) {
throw new IllegalArgumentException("inputChannel must not be null");
}
if (inputHandler == null) {
throw new IllegalArgumentException("inputHandler must not be null");
}
if (messageQueue == null) {
throw new IllegalArgumentException("messageQueue must not be null");
}
synchronized (sLock) {
Slog.d(TAG, "Registering input channel '" + inputChannel + "'");
nativeRegisterInputChannel(inputChannel, inputHandler, messageQueue);
}
}
/**
* Unregisters an input channel.
* Does nothing if the channel is not currently registered.
* @param inputChannel The input channel to unregister.
*/
public static void unregisterInputChannel(InputChannel inputChannel) {
if (inputChannel == null) {
throw new IllegalArgumentException("inputChannel must not be null");
}
synchronized (sLock) {
Slog.d(TAG, "Unregistering input channel '" + inputChannel + "'");
nativeUnregisterInputChannel(inputChannel);
}
}
@SuppressWarnings("unused")
private static void dispatchKeyEvent(InputHandler inputHandler,
KeyEvent event, int nature, long finishedToken) {
Runnable finishedCallback = new FinishedCallback(finishedToken);
if (nature == INPUT_EVENT_NATURE_KEY) {
inputHandler.handleKey(event, finishedCallback);
} else {
Slog.d(TAG, "Unsupported nature for key event: " + nature);
}
}
@SuppressWarnings("unused")
private static void dispatchMotionEvent(InputHandler inputHandler,
MotionEvent event, int nature, long finishedToken) {
Runnable finishedCallback = new FinishedCallback(finishedToken);
if (nature == INPUT_EVENT_NATURE_TOUCH) {
inputHandler.handleTouch(event, finishedCallback);
} else if (nature == INPUT_EVENT_NATURE_TRACKBALL) {
inputHandler.handleTrackball(event, finishedCallback);
} else {
Slog.d(TAG, "Unsupported nature for motion event: " + nature);
}
}
// TODO consider recycling finished callbacks when done
private static class FinishedCallback implements Runnable {
private long mFinishedToken;
public FinishedCallback(long finishedToken) {
mFinishedToken = finishedToken;
}
public void run() {
synchronized (sLock) {
nativeFinished(mFinishedToken);
}
}
}
}
|
