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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_DISPATCHER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PLATFORM_EVENT_DISPATCHER_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
namespace blink {
class PlatformEventController;
class LocalFrame;
class CORE_EXPORT PlatformEventDispatcher : public GarbageCollectedMixin {
public:
// Adds a controller to be notified when a change event occurs and starts
// listening for change events. |frame| is the frame that will be passed to
// the dispatcher's StartListening method. The caller must provide a valid,
// non-nullptr frame.
//
// Note that the frame associated with the controller's document may be
// nullptr if the document was shut down, which can occur when a frame
// navigates from an initial empty document to another same-origin document.
// If the controller was initialized with the initial empty document, it may
// need to provide a valid frame from another source, for instance the
// DOMWindow.
// TODO(crbug.com/850619): fix all the callsites, currently not all of them
// (and unittests) are guaranteed to pass a non-nullptr frame.
void AddController(PlatformEventController*, LocalFrame* frame);
// Removes a controller from |controllers_| and stops listening if there are
// no more registered controllers.
void RemoveController(PlatformEventController*);
void Trace(Visitor*) const override;
protected:
PlatformEventDispatcher();
void NotifyControllers();
virtual void StartListening(LocalFrame* frame) = 0;
virtual void StopListening() = 0;
private:
void PurgeControllers();
HeapHashSet<WeakMember<PlatformEventController>> controllers_;
bool is_dispatching_;
bool is_listening_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PLATFORM_EVENT_DISPATCHER_H_
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