PointerEventDispatcher.java revision 9158825f9c41869689d6b1786d7c7aa8bdd524ce 
1/*
2 * Copyright (C) 2013 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
17package com.android.server.wm;
18
19import android.view.InputChannel;
20import android.view.InputDevice;
21import android.view.InputEvent;
22import android.view.InputEventReceiver;
23import android.view.MotionEvent;
24import android.view.WindowManagerPolicy.PointerEventListener;
25
26import com.android.server.UiThread;
27
28import java.util.ArrayList;
29
30public class PointerEventDispatcher extends InputEventReceiver {
31    ArrayList<PointerEventListener> mListeners = new ArrayList<PointerEventListener>();
32    PointerEventListener[] mListenersArray = new PointerEventListener[0];
33
34    public PointerEventDispatcher(InputChannel inputChannel) {
35        super(inputChannel, UiThread.getHandler().getLooper());
36    }
37
38    @Override
39    public void onInputEvent(InputEvent event) {
40        try {
41            if (event instanceof MotionEvent
42                    && (event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
43                final MotionEvent motionEvent = (MotionEvent)event;
44                PointerEventListener[] listeners;
45                synchronized (mListeners) {
46                    if (mListenersArray == null) {
47                        mListenersArray = new PointerEventListener[mListeners.size()];
48                        mListeners.toArray(mListenersArray);
49                    }
50                    listeners = mListenersArray;
51                }
52                for (int i = 0; i < listeners.length; ++i) {
53                    listeners[i].onPointerEvent(motionEvent);
54                }
55            }
56        } finally {
57            finishInputEvent(event, false);
58        }
59    }
60
61    /**
62     * Add the specified listener to the list.
63     * @param listener The listener to add.
64     */
65    public void registerInputEventListener(PointerEventListener listener) {
66        synchronized (mListeners) {
67            if (mListeners.contains(listener)) {
68                throw new IllegalStateException("registerInputEventListener: trying to register" +
69                        listener + " twice.");
70            }
71            mListeners.add(listener);
72            mListenersArray = null;
73        }
74    }
75
76    /**
77     * Remove the specified listener from the list.
78     * @param listener The listener to remove.
79     */
80    public void unregisterInputEventListener(PointerEventListener listener) {
81        synchronized (mListeners) {
82            if (!mListeners.contains(listener)) {
83                throw new IllegalStateException("registerInputEventListener: " + listener +
84                        " not registered.");
85            }
86            mListeners.remove(listener);
87            mListenersArray = null;
88        }
89    }
90}
91