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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "config.h" |
| 6 #include "core/frame/DeviceEventControllerBase.h" |
| 7 |
| 8 #include "core/page/Page.h" |
| 9 |
| 10 namespace WebCore { |
| 11 |
| 12 DeviceEventControllerBase::DeviceEventControllerBase(Page* page) |
| 13 : PageLifecycleObserver(page) |
| 14 , m_hasEventListener(false) |
| 15 , m_isActive(false) |
| 16 , m_timer(this, &DeviceEventControllerBase::oneShotCallback) |
| 17 { |
| 18 } |
| 19 |
| 20 DeviceEventControllerBase::~DeviceEventControllerBase() |
| 21 { |
| 22 } |
| 23 |
| 24 void DeviceEventControllerBase::oneShotCallback(Timer<DeviceEventControllerBase>
* timer) |
| 25 { |
| 26 ASSERT_UNUSED(timer, timer == &m_timer); |
| 27 ASSERT(hasLastData()); |
| 28 ASSERT(!m_timer.isActive()); |
| 29 |
| 30 didUpdateData(); |
| 31 } |
| 32 |
| 33 void DeviceEventControllerBase::startUpdating() |
| 34 { |
| 35 if (m_isActive) |
| 36 return; |
| 37 |
| 38 if (hasLastData() && !m_timer.isActive()) { |
| 39 // Make sure to fire the data as soon as possible. |
| 40 m_timer.startOneShot(0, FROM_HERE); |
| 41 } |
| 42 |
| 43 registerWithDispatcher(); |
| 44 m_isActive = true; |
| 45 } |
| 46 |
| 47 void DeviceEventControllerBase::stopUpdating() |
| 48 { |
| 49 if (!m_isActive) |
| 50 return; |
| 51 |
| 52 if (m_timer.isActive()) |
| 53 m_timer.stop(); |
| 54 |
| 55 unregisterWithDispatcher(); |
| 56 m_isActive = false; |
| 57 } |
| 58 |
| 59 void DeviceEventControllerBase::pageVisibilityChanged() |
| 60 { |
| 61 if (!m_hasEventListener) |
| 62 return; |
| 63 |
| 64 if (page()->visibilityState() == PageVisibilityStateVisible) |
| 65 startUpdating(); |
| 66 else |
| 67 stopUpdating(); |
| 68 } |
| 69 |
| 70 } // namespace WebCore |
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