// 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 "native_mate/wrappable.h" namespace content { class WebContents; } namespace IPC { class Message; } namespace mate { namespace internal { v8::Local<v8::Object> CreateJSEvent(v8::Isolate* isolate, v8::Local<v8::Object> object, content::WebContents* 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::Local<v8::Object> GetWrapper() { return Wrappable<T>::GetWrapper(); } v8::Isolate* isolate() const { return Wrappable<T>::isolate(); } // 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::WebContents* sender, IPC::Message* message, const Args&... args) { v8::Locker locker(isolate()); v8::HandleScope handle_scope(isolate()); v8::Local<v8::Object> event = internal::CreateJSEvent( isolate(), GetWrapper(), 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) { 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_