199f6d64db
* refactor: move EventEmitter::EmitWithEvent() into EventEmitter::Emit() * perf: remove redundant calls to isolate() in EventEmitter::Emit() * perf: remove redundant calls to GetWrapper() in EventEmitter::EmitEvent() * perf: remove redundant calls to isolate() in EventEmitter::EmitWithoutEvent() * perf: remove redundant calls to GetWrapper() in EventEmitter::EmitWithoutEvent() * refactor: remove unused method EventEmitter::isolate() * refactor: remove unused method EventEmitter::GetWrapper(v8::Isolate*) * refactor: remove unused method EventEmitter::GetWrapper() refactor: make the EventEmitter::Base typedef private * refactor: remove unused typedef EventEmitter::Base See "Workarounds" section in https://isocpp.org/wiki/faq/templates#nondependent-name-lookup-members * refactor: remove redundant gin_helper:: namespace use
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
// Copyright (c) 2019 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 ELECTRON_SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
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#define ELECTRON_SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
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#include <string_view>
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#include <utility>
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#include "gin/handle.h"
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#include "shell/common/gin_helper/event.h"
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#include "shell/common/gin_helper/event_emitter_caller.h"
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#include "shell/common/gin_helper/wrappable.h"
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namespace content {
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class RenderFrameHost;
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}
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namespace gin_helper {
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// Provide helpers to emit event in JavaScript.
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template <typename T>
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class EventEmitter : public gin_helper::Wrappable<T> {
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public:
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// this.emit(name, new Event(), args...);
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template <typename... Args>
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bool Emit(const std::string_view name, Args&&... args) {
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v8::Isolate* const isolate = this->isolate();
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v8::HandleScope handle_scope{isolate};
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v8::Local<v8::Object> wrapper = this->GetWrapper();
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if (wrapper.IsEmpty())
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return false;
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gin::Handle<internal::Event> event = internal::Event::New(isolate);
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// It's possible that |this| will be deleted by EmitEvent, so save anything
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// we need from |this| before calling EmitEvent.
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EmitEvent(isolate, wrapper, name, event, std::forward<Args>(args)...);
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return event->GetDefaultPrevented();
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}
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// this.emit(name, args...);
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template <typename... Args>
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void EmitWithoutEvent(const std::string_view name, Args&&... args) {
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v8::Isolate* const isolate = this->isolate();
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v8::HandleScope handle_scope{isolate};
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v8::Local<v8::Object> wrapper = this->GetWrapper();
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if (wrapper.IsEmpty())
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return;
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EmitEvent(isolate, wrapper, name, std::forward<Args>(args)...);
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}
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// disable copy
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EventEmitter(const EventEmitter&) = delete;
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EventEmitter& operator=(const EventEmitter&) = delete;
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protected:
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EventEmitter() = default;
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};
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} // namespace gin_helper
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#endif // ELECTRON_SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
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