mirror of https://github.com/electron/electron
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
// Copyright (c) 2019 GitHub, Inc.
|
|
// Use of this source code is governed by the MIT license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#ifndef ELECTRON_SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
|
|
#define ELECTRON_SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
|
|
|
|
#include <string_view>
|
|
#include <utility>
|
|
|
|
#include "electron/shell/common/api/api.mojom.h"
|
|
#include "gin/handle.h"
|
|
#include "shell/common/gin_helper/event.h"
|
|
#include "shell/common/gin_helper/event_emitter_caller.h"
|
|
#include "shell/common/gin_helper/wrappable.h"
|
|
|
|
namespace content {
|
|
class RenderFrameHost;
|
|
}
|
|
|
|
namespace gin_helper {
|
|
|
|
// Provide helpers to emit event in JavaScript.
|
|
template <typename T>
|
|
class EventEmitter : public gin_helper::Wrappable<T> {
|
|
public:
|
|
using Base = gin_helper::Wrappable<T>;
|
|
|
|
// Make the convenient methods visible:
|
|
// https://isocpp.org/wiki/faq/templates#nondependent-name-lookup-members
|
|
v8::Isolate* isolate() const { return Base::isolate(); }
|
|
v8::Local<v8::Object> GetWrapper() const { return Base::GetWrapper(); }
|
|
v8::MaybeLocal<v8::Object> GetWrapper(v8::Isolate* isolate) const {
|
|
return Base::GetWrapper(isolate);
|
|
}
|
|
|
|
// this.emit(name, new Event(), args...);
|
|
template <typename... Args>
|
|
bool Emit(const std::string_view name, Args&&... args) {
|
|
v8::HandleScope handle_scope(isolate());
|
|
v8::Local<v8::Object> wrapper = GetWrapper();
|
|
if (wrapper.IsEmpty())
|
|
return false;
|
|
gin::Handle<gin_helper::internal::Event> event =
|
|
internal::Event::New(isolate());
|
|
return EmitWithEvent(name, event, std::forward<Args>(args)...);
|
|
}
|
|
|
|
// disable copy
|
|
EventEmitter(const EventEmitter&) = delete;
|
|
EventEmitter& operator=(const EventEmitter&) = delete;
|
|
|
|
protected:
|
|
EventEmitter() {}
|
|
|
|
private:
|
|
// this.emit(name, event, args...);
|
|
template <typename... Args>
|
|
bool EmitWithEvent(const std::string_view name,
|
|
gin::Handle<gin_helper::internal::Event> event,
|
|
Args&&... args) {
|
|
// It's possible that |this| will be deleted by EmitEvent, so save anything
|
|
// we need from |this| before calling EmitEvent.
|
|
auto* isolate = this->isolate();
|
|
gin_helper::EmitEvent(isolate, GetWrapper(), name, event,
|
|
std::forward<Args>(args)...);
|
|
return event->GetDefaultPrevented();
|
|
}
|
|
};
|
|
|
|
} // namespace gin_helper
|
|
|
|
#endif // ELECTRON_SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
|