Index: Source/core/frame/DeviceEventControllerBase.cpp |
diff --git a/Source/core/frame/DeviceEventControllerBase.cpp b/Source/core/frame/DeviceEventControllerBase.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f5f5eab4a0f110e1552a43adc3585f693f71c74a |
--- /dev/null |
+++ b/Source/core/frame/DeviceEventControllerBase.cpp |
@@ -0,0 +1,70 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "config.h" |
+#include "core/frame/DeviceEventControllerBase.h" |
+ |
+#include "core/page/Page.h" |
+ |
+namespace WebCore { |
+ |
+DeviceEventControllerBase::DeviceEventControllerBase(Page* page) |
+ : PageLifecycleObserver(page) |
+ , m_hasEventListener(false) |
+ , m_isActive(false) |
+ , m_timer(this, &DeviceEventControllerBase::oneShotCallback) |
+{ |
+} |
+ |
+DeviceEventControllerBase::~DeviceEventControllerBase() |
+{ |
+} |
+ |
+void DeviceEventControllerBase::oneShotCallback(Timer<DeviceEventControllerBase>* timer) |
+{ |
+ ASSERT_UNUSED(timer, timer == &m_timer); |
+ ASSERT(hasLastData()); |
+ ASSERT(!m_timer.isActive()); |
+ |
+ didUpdateData(); |
+} |
+ |
+void DeviceEventControllerBase::startUpdating() |
+{ |
+ if (m_isActive) |
+ return; |
+ |
+ if (hasLastData() && !m_timer.isActive()) { |
+ // Make sure to fire the data as soon as possible. |
+ m_timer.startOneShot(0, FROM_HERE); |
+ } |
+ |
+ registerWithDispatcher(); |
+ m_isActive = true; |
+} |
+ |
+void DeviceEventControllerBase::stopUpdating() |
+{ |
+ if (!m_isActive) |
+ return; |
+ |
+ if (m_timer.isActive()) |
+ m_timer.stop(); |
+ |
+ unregisterWithDispatcher(); |
+ m_isActive = false; |
+} |
+ |
+void DeviceEventControllerBase::pageVisibilityChanged() |
+{ |
+ if (!m_hasEventListener) |
+ return; |
+ |
+ if (page()->visibilityState() == PageVisibilityStateVisible) |
+ startUpdating(); |
+ else |
+ stopUpdating(); |
+} |
+ |
+} // namespace WebCore |