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// Copyright 2016 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 EXTENSIONS_RENDERER_API_EVENT_HANDLER_H_
#define EXTENSIONS_RENDERER_API_EVENT_HANDLER_H_
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "extensions/renderer/api_binding_types.h"
#include "extensions/renderer/event_emitter.h"
#include "v8/include/v8.h"
namespace base {
class ListValue;
}
namespace extensions {
// The object to handle API events. This includes vending v8::Objects for the
// event; handling adding, removing, and querying listeners; and firing events
// to subscribed listeners. Designed to be used across JS contexts, but on a
// single thread.
class APIEventHandler {
public:
using EventListenersChangedMethod =
base::Callback<void(const std::string& event_name,
binding::EventListenersChanged,
v8::Local<v8::Context>)>;
APIEventHandler(const binding::RunJSFunction& call_js,
const EventListenersChangedMethod& listeners_changed);
~APIEventHandler();
// Returns a new v8::Object for an event with the given |event_name|.
v8::Local<v8::Object> CreateEventInstance(const std::string& event_name,
v8::Local<v8::Context> context);
// Notifies all listeners of the event with the given |event_name| in the
// specified |context|, sending the included |arguments|.
void FireEventInContext(const std::string& event_name,
v8::Local<v8::Context> context,
const base::ListValue& arguments);
// Returns the EventListeners for a given |event_name| and |context|.
size_t GetNumEventListenersForTesting(const std::string& event_name,
v8::Local<v8::Context> context);
private:
// Method to run a given v8::Function. Curried in for testing.
binding::RunJSFunction call_js_;
EventListenersChangedMethod listeners_changed_;
DISALLOW_COPY_AND_ASSIGN(APIEventHandler);
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_API_EVENT_HANDLER_H_
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