125 lines
4.1 KiB
C++
125 lines
4.1 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 <utility>
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#include <vector>
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#include "atom/common/api/event_emitter_caller.h"
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#include "base/optional.h"
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#include "content/public/browser/browser_thread.h"
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#include "electron/atom/common/api/api.mojom.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 mate {
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namespace internal {
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v8::Local<v8::Object> CreateJSEvent(
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v8::Isolate* isolate,
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v8::Local<v8::Object> object,
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content::RenderFrameHost* sender,
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base::Optional<atom::mojom::ElectronBrowser::MessageSyncCallback> callback);
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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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v8::MaybeLocal<v8::Object> GetWrapper(v8::Isolate* isolate) const {
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return Wrappable<T>::GetWrapper(isolate);
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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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Args&&... args) {
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return EmitWithEvent(
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name, internal::CreateCustomEvent(isolate(), GetWrapper(), event),
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std::forward<Args>(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, int flags, Args&&... args) {
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return EmitCustomEvent(name,
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internal::CreateEventFromFlags(isolate(), flags),
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std::forward<Args>(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, Args&&... args) {
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return EmitWithSender(name, nullptr, base::nullopt,
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std::forward<Args>(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(
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const base::StringPiece& name,
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content::RenderFrameHost* sender,
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base::Optional<atom::mojom::ElectronBrowser::MessageSyncCallback>
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callback,
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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 = internal::CreateJSEvent(
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isolate(), wrapper, sender, std::move(callback));
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return EmitWithEvent(name, event, std::forward<Args>(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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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,
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std::forward<Args>(args)...);
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auto context = isolate()->GetCurrentContext();
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v8::Local<v8::Value> defaultPrevented;
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if (event->Get(context, StringToV8(isolate(), "defaultPrevented"))
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.ToLocal(&defaultPrevented)) {
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return defaultPrevented->BooleanValue(isolate());
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}
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return false;
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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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