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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 PlatformEventController_h
#define PlatformEventController_h
#include "core/page/PageLifecycleObserver.h"
#include "platform/Timer.h"
#include "platform/heap/Handle.h"
namespace blink {
// 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 PlatformEventController : public PageLifecycleObserver {
public:
void startUpdating();
void stopUpdating();
// This is called when new data becomes available.
virtual void didUpdateData() = 0;
protected:
explicit PlatformEventController(Page*);
virtual ~PlatformEventController();
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;
void oneShotCallback(Timer<PlatformEventController>*);
bool m_isActive;
Timer<PlatformEventController> m_timer;
};
} // namespace blink
#endif // PlatformEventController_h
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