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
33 namespace WebCore {
34
DeviceMotionController(DeviceMotionClient * client)35 DeviceMotionController::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
~DeviceMotionController()43 DeviceMotionController::~DeviceMotionController()
44 {
45 m_client->deviceMotionControllerDestroyed();
46 }
47
timerFired(Timer<DeviceMotionController> * timer)48 void 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
addListener(DOMWindow * window)64 void 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
removeListener(DOMWindow * window)80 void 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
removeAllListeners(DOMWindow * window)88 void 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
didChangeDeviceMotion(DeviceMotionData * deviceMotionData)100 void 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