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event_emitter.h
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event_emitter.h
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// Copyright (c) 2014 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#ifndef ATOM_BROWSER_API_EVENT_EMITTER_H_
#define ATOM_BROWSER_API_EVENT_EMITTER_H_
#include <vector>
#include "atom/common/api/event_emitter_caller.h"
#include "content/public/browser/browser_thread.h"
#include "native_mate/wrappable.h"
namespace content {
class RenderFrameHost;
}
namespace IPC {
class Message;
}
namespace mate {
namespace internal {
v8::Local<v8::Object> CreateJSEvent(v8::Isolate* isolate,
v8::Local<v8::Object> object,
content::RenderFrameHost* sender,
IPC::Message* message);
v8::Local<v8::Object> CreateCustomEvent(v8::Isolate* isolate,
v8::Local<v8::Object> object,
v8::Local<v8::Object> event);
v8::Local<v8::Object> CreateEventFromFlags(v8::Isolate* isolate, int flags);
} // namespace internal
// Provide helperers to emit event in JavaScript.
template <typename T>
class EventEmitter : public Wrappable<T> {
public:
typedef std::vector<v8::Local<v8::Value>> ValueArray;
// Make the convinient methods visible:
// https://isocpp.org/wiki/faq/templates#nondependent-name-lookup-members
v8::Isolate* isolate() const { return Wrappable<T>::isolate(); }
v8::Local<v8::Object> GetWrapper() const {
return Wrappable<T>::GetWrapper();
}
// this.emit(name, event, args...);
template <typename... Args>
bool EmitCustomEvent(const base::StringPiece& name,
v8::Local<v8::Object> event,
const Args&... args) {
return EmitWithEvent(
name, internal::CreateCustomEvent(isolate(), GetWrapper(), event),
args...);
}
// this.emit(name, new Event(flags), args...);
template <typename... Args>
bool EmitWithFlags(const base::StringPiece& name,
int flags,
const Args&... args) {
return EmitCustomEvent(
name, internal::CreateEventFromFlags(isolate(), flags), args...);
}
// this.emit(name, new Event(), args...);
template <typename... Args>
bool Emit(const base::StringPiece& name, const Args&... args) {
return EmitWithSender(name, nullptr, nullptr, args...);
}
// this.emit(name, new Event(sender, message), args...);
template <typename... Args>
bool EmitWithSender(const base::StringPiece& name,
content::RenderFrameHost* sender,
IPC::Message* message,
const Args&... args) {
v8::Locker locker(isolate());
v8::HandleScope handle_scope(isolate());
v8::Local<v8::Object> wrapper = GetWrapper();
if (wrapper.IsEmpty()) {
return false;
}
v8::Local<v8::Object> event =
internal::CreateJSEvent(isolate(), wrapper, sender, message);
return EmitWithEvent(name, event, args...);
}
protected:
EventEmitter() {}
private:
// this.emit(name, event, args...);
template <typename... Args>
bool EmitWithEvent(const base::StringPiece& name,
v8::Local<v8::Object> event,
const Args&... args) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
v8::Locker locker(isolate());
v8::HandleScope handle_scope(isolate());
EmitEvent(isolate(), GetWrapper(), name, event, args...);
return event->Get(StringToV8(isolate(), "defaultPrevented"))
->BooleanValue();
}
DISALLOW_COPY_AND_ASSIGN(EventEmitter);
};
} // namespace mate
#endif // ATOM_BROWSER_API_EVENT_EMITTER_H_