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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_EVENT_EMITTER_H_
#define EXTENSIONS_RENDERER_EVENT_EMITTER_H_
#include <vector>
#include "extensions/renderer/api_binding_types.h"
#include "gin/wrappable.h"
#include "v8/include/v8.h"
namespace gin {
class Arguments;
}
namespace extensions {
// A gin::Wrappable Event object. One is expected to be created per event, per
// context. Note: this object *does not* clear any events, so it must be
// destroyed with the context to avoid leaking.
class EventEmitter final : public gin::Wrappable<EventEmitter> {
public:
using Listeners = std::vector<v8::Global<v8::Function>>;
using ListenersChangedMethod =
base::Callback<void(binding::EventListenersChanged,
v8::Local<v8::Context>)>;
EventEmitter(const binding::RunJSFunction& run_js,
const ListenersChangedMethod& listeners_changed);
~EventEmitter() override;
static gin::WrapperInfo kWrapperInfo;
// gin::Wrappable:
gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
v8::Isolate* isolate) final;
void Fire(v8::Local<v8::Context> context,
std::vector<v8::Local<v8::Value>>* args);
Listeners* listeners() { return &listeners_; }
private:
// Bound methods for the Event JS object.
void AddListener(gin::Arguments* arguments);
void RemoveListener(gin::Arguments* arguments);
bool HasListener(v8::Local<v8::Function> function);
bool HasListeners();
void Dispatch(gin::Arguments* arguments);
Listeners listeners_;
binding::RunJSFunction run_js_;
ListenersChangedMethod listeners_changed_;
DISALLOW_COPY_AND_ASSIGN(EventEmitter);
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_EVENT_EMITTER_H_
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