1/*
2 * Copyright 2010 Apple 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
6 * are met:
7 *  * Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 *  * Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "DeviceMotionController.h"
28
29#include "DeviceMotionClient.h"
30#include "DeviceMotionData.h"
31#include "DeviceMotionEvent.h"
32
33namespace WebCore {
34
35DeviceMotionController::DeviceMotionController(DeviceMotionClient* client)
36    : m_client(client)
37    , m_timer(this, &DeviceMotionController::timerFired)
38{
39    ASSERT(m_client);
40    m_client->setController(this);
41}
42
43DeviceMotionController::~DeviceMotionController()
44{
45    m_client->deviceMotionControllerDestroyed();
46}
47
48void DeviceMotionController::timerFired(Timer<DeviceMotionController>* timer)
49{
50    ASSERT_UNUSED(timer, timer == &m_timer);
51    ASSERT(!m_client || m_client->currentDeviceMotion());
52    m_timer.stop();
53
54    RefPtr<DeviceMotionData> deviceMotionData = m_client ? m_client->currentDeviceMotion() : DeviceMotionData::create();
55    RefPtr<DeviceMotionEvent> event = DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionData.get());
56
57    Vector<RefPtr<DOMWindow> > listenersVector;
58    copyToVector(m_newListeners, listenersVector);
59    m_newListeners.clear();
60    for (size_t i = 0; i < listenersVector.size(); ++i)
61        listenersVector[i]->dispatchEvent(event);
62}
63
64void DeviceMotionController::addListener(DOMWindow* window)
65{
66    // If no client is present or the client already has motion data,
67    // immediately trigger an asynchronous response.
68    if (!m_client || m_client->currentDeviceMotion()) {
69        m_newListeners.add(window);
70        if (!m_timer.isActive())
71            m_timer.startOneShot(0);
72    }
73
74    bool wasEmpty = m_listeners.isEmpty();
75    m_listeners.add(window);
76    if (wasEmpty && m_client)
77        m_client->startUpdating();
78}
79
80void DeviceMotionController::removeListener(DOMWindow* window)
81{
82    m_listeners.remove(window);
83    m_newListeners.remove(window);
84    if (m_listeners.isEmpty() && m_client)
85        m_client->stopUpdating();
86}
87
88void DeviceMotionController::removeAllListeners(DOMWindow* window)
89{
90    // May be called with a DOMWindow that's not a listener.
91    if (!m_listeners.contains(window))
92        return;
93
94    m_listeners.removeAll(window);
95    m_newListeners.remove(window);
96    if (m_listeners.isEmpty() && m_client)
97        m_client->stopUpdating();
98}
99
100void DeviceMotionController::didChangeDeviceMotion(DeviceMotionData* deviceMotionData)
101{
102    RefPtr<DeviceMotionEvent> event = DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionData);
103    Vector<RefPtr<DOMWindow> > listenersVector;
104    copyToVector(m_listeners, listenersVector);
105    for (size_t i = 0; i < listenersVector.size(); ++i)
106        listenersVector[i]->dispatchEvent(event);
107}
108
109} // namespace WebCore
110