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