1/*
2 * Copyright (C) 2013 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "modules/device_orientation/DeviceMotionDispatcher.h"
33
34#include "modules/device_orientation/DeviceMotionController.h"
35#include "modules/device_orientation/DeviceMotionData.h"
36#include "public/platform/Platform.h"
37#include "wtf/TemporaryChange.h"
38
39namespace WebCore {
40
41DeviceMotionDispatcher& DeviceMotionDispatcher::instance()
42{
43    DEFINE_STATIC_LOCAL(DeviceMotionDispatcher, deviceMotionDispatcher, ());
44    return deviceMotionDispatcher;
45}
46
47DeviceMotionDispatcher::DeviceMotionDispatcher()
48{
49}
50
51DeviceMotionDispatcher::~DeviceMotionDispatcher()
52{
53}
54
55void DeviceMotionDispatcher::addDeviceMotionController(DeviceMotionController* controller)
56{
57    addController(controller);
58}
59
60void DeviceMotionDispatcher::removeDeviceMotionController(DeviceMotionController* controller)
61{
62    removeController(controller);
63}
64
65void DeviceMotionDispatcher::startListening()
66{
67    blink::Platform::current()->setDeviceMotionListener(this);
68}
69
70void DeviceMotionDispatcher::stopListening()
71{
72    blink::Platform::current()->setDeviceMotionListener(0);
73    m_lastDeviceMotionData.clear();
74}
75
76void DeviceMotionDispatcher::didChangeDeviceMotion(const blink::WebDeviceMotionData& motion)
77{
78    m_lastDeviceMotionData = DeviceMotionData::create(motion);
79
80    {
81        TemporaryChange<bool> changeIsDispatching(m_isDispatching, true);
82        // Don't fire controllers removed or added during event dispatch.
83        size_t size = m_controllers.size();
84        for (size_t i = 0; i < size; ++i) {
85            if (m_controllers[i])
86                static_cast<DeviceMotionController*>(m_controllers[i])->didChangeDeviceMotion(m_lastDeviceMotionData.get());
87        }
88    }
89
90    if (m_needsPurge)
91        purgeControllers();
92}
93
94DeviceMotionData* DeviceMotionDispatcher::latestDeviceMotionData()
95{
96    return m_lastDeviceMotionData.get();
97}
98
99} // namespace WebCore
100