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1 /* | |
2 * Copyright (C) 2014 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 "core/frame/DeviceEventControllerBase.h" | |
33 | |
34 #include "core/page/Page.h" | |
35 | |
36 namespace WebCore { | |
37 | |
38 DeviceEventControllerBase::DeviceEventControllerBase(Page* page) | |
39 : PageLifecycleObserver(page) | |
40 , m_hasEventListener(false) | |
41 , m_isActive(false) | |
42 , m_timer(this, &DeviceEventControllerBase::oneShotCallback) | |
43 { | |
44 } | |
45 | |
46 DeviceEventControllerBase::~DeviceEventControllerBase() | |
47 { | |
48 } | |
49 | |
50 void DeviceEventControllerBase::oneShotCallback(Timer<DeviceEventControllerBase> * timer) | |
51 { | |
52 ASSERT_UNUSED(timer, timer == &m_timer); | |
53 ASSERT(isInvokeInitialUpdate()); | |
54 | |
55 m_timer.stop(); | |
Inactive
2014/06/03 13:49:33
Why do we need to stop the timer? It is one-shot.
timvolodine
2014/06/03 18:45:54
yeah right it's one shot. added an "non-active" as
| |
56 didUpdateData(); | |
57 } | |
58 | |
59 void DeviceEventControllerBase::startUpdating() | |
60 { | |
61 if (m_isActive) | |
62 return; | |
63 | |
64 if (isInvokeInitialUpdate() && !m_timer.isActive()) { | |
65 // Make sure to fire the data as soon as possible. | |
66 m_timer.startOneShot(0, FROM_HERE); | |
67 } | |
68 | |
69 registerWithDispatcher(); | |
70 m_isActive = true; | |
71 } | |
72 | |
73 void DeviceEventControllerBase::stopUpdating() | |
74 { | |
75 if (!m_isActive) | |
76 return; | |
77 | |
78 if (m_timer.isActive()) | |
79 m_timer.stop(); | |
80 | |
81 unregisterWithDispatcher(); | |
82 m_isActive = false; | |
83 } | |
84 | |
85 void DeviceEventControllerBase::pageVisibilityChanged() | |
86 { | |
87 if (!m_hasEventListener) | |
88 return; | |
89 | |
90 if (page()->visibilityState() == PageVisibilityStateVisible) | |
91 startUpdating(); | |
92 else | |
93 stopUpdating(); | |
94 } | |
95 | |
96 } // namespace WebCore | |
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