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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 THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PLATFORM_EVENT_CONTROLLER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PLATFORM_EVENT_CONTROLLER_H_
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/page/page_visibility_observer.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/timer.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 CORE_EXPORT PlatformEventController : public PageVisibilityObserver {
public:
void StartUpdating();
void StopUpdating();
// This is called when new data becomes available.
virtual void DidUpdateData() = 0;
void Trace(blink::Visitor*) override;
protected:
explicit PlatformEventController(Document*);
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 has_event_listener_;
private:
// Inherited from PageVisibilityObserver.
void PageVisibilityChanged() override;
void UpdateCallback();
bool is_active_;
Member<Document> document_;
TaskHandle update_callback_handle_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PLATFORM_EVENT_CONTROLLER_H_
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