Index: Source/core/frame/DeviceEventControllerBase.h |
diff --git a/Source/core/frame/DeviceEventControllerBase.h b/Source/core/frame/DeviceEventControllerBase.h |
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+++ b/Source/core/frame/DeviceEventControllerBase.h |
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+// 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. |
+ |
+#ifndef DeviceEventControllerBase_h |
+#define DeviceEventControllerBase_h |
+ |
+#include "core/page/PageLifecycleObserver.h" |
+#include "platform/Timer.h" |
+ |
+namespace WebCore { |
+ |
+// Base controller class for registering controllers with a dispatcher. |
+// It watches page visibility and calls stopUpdating when page is not visible. |
+// It provides a didUpdateData() callback method which is called when new data |
+// it available. |
+class DeviceEventControllerBase : public PageLifecycleObserver { |
+public: |
+ void startUpdating(); |
+ void stopUpdating(); |
+ |
+ // This is called when new data becomes available. |
+ virtual void didUpdateData() = 0; |
+ |
+protected: |
+ explicit DeviceEventControllerBase(Page*); |
+ virtual ~DeviceEventControllerBase(); |
+ |
+ virtual void registerWithDispatcher() = 0; |
+ virtual void unregisterWithDispatcher() = 0; |
+ |
+ // When true initiates a one-shot didUpdateData() when startUpdating() is called. |
+ virtual bool hasLastData() = 0; |
+ |
+ bool m_hasEventListener; |
+ |
+private: |
+ // Inherited from PageLifecycleObserver. |
+ virtual void pageVisibilityChanged() OVERRIDE FINAL; |
+ |
+ void oneShotCallback(Timer<DeviceEventControllerBase>*); |
+ |
+ bool m_isActive; |
+ Timer<DeviceEventControllerBase> m_timer; |
+}; |
+ |
+} // namespace WebCore |
+ |
+#endif // DeviceEventControllerBase_h |