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295f920116
I wrote a script to do this which is attached to the bug. TBR=abarth@chromium.org BUG=435361 Review URL: https://codereview.chromium.org/736373003
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef SKY_ENGINE_CORE_FRAME_PLATFORMEVENTCONTROLLER_H_
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#define SKY_ENGINE_CORE_FRAME_PLATFORMEVENTCONTROLLER_H_
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#include "sky/engine/core/page/PageLifecycleObserver.h"
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#include "sky/engine/platform/Timer.h"
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#include "sky/engine/platform/heap/Handle.h"
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namespace blink {
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// Base controller class for registering controllers with a dispatcher.
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// It watches page visibility and calls stopUpdating when page is not visible.
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// It provides a didUpdateData() callback method which is called when new data
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// it available.
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class PlatformEventController : public PageLifecycleObserver {
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public:
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void startUpdating();
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void stopUpdating();
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// This is called when new data becomes available.
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virtual void didUpdateData() = 0;
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protected:
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explicit PlatformEventController(Page*);
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virtual ~PlatformEventController();
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virtual void registerWithDispatcher() = 0;
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virtual void unregisterWithDispatcher() = 0;
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// When true initiates a one-shot didUpdateData() when startUpdating() is called.
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virtual bool hasLastData() = 0;
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bool m_hasEventListener;
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private:
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// Inherited from PageLifecycleObserver.
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virtual void pageVisibilityChanged() override;
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void oneShotCallback(Timer<PlatformEventController>*);
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bool m_isActive;
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Timer<PlatformEventController> m_timer;
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};
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} // namespace blink
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#endif // SKY_ENGINE_CORE_FRAME_PLATFORMEVENTCONTROLLER_H_
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