104 lines
3.4 KiB
C++
104 lines
3.4 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 <utility>
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#include <vector>
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#include "content/public/browser/browser_thread.h"
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#include "electron/shell/common/api/api.mojom.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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namespace internal {
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v8::Local<v8::Object> CreateCustomEvent(
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v8::Isolate* isolate,
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v8::Local<v8::Object> sender = v8::Local<v8::Object>(),
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v8::Local<v8::Object> custom_event = v8::Local<v8::Object>());
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v8::Local<v8::Object> CreateNativeEvent(
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v8::Isolate* isolate,
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v8::Local<v8::Object> sender,
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content::RenderFrameHost* frame,
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electron::mojom::ElectronBrowser::MessageSyncCallback callback);
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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 gin_helper::Wrappable<T> {
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public:
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using Base = gin_helper::Wrappable<T>;
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using ValueArray = std::vector<v8::Local<v8::Value>>;
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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 Base::isolate(); }
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v8::Local<v8::Object> GetWrapper() const { return Base::GetWrapper(); }
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v8::MaybeLocal<v8::Object> GetWrapper(v8::Isolate* isolate) const {
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return Base::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(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(), args...);
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template <typename... Args>
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bool Emit(base::StringPiece name, 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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v8::Local<v8::Object> event =
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internal::CreateCustomEvent(isolate(), wrapper);
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return EmitWithEvent(name, event, 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() {}
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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(base::StringPiece name,
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v8::Local<v8::Object> event,
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Args&&... args) {
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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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auto* isolate = this->isolate();
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auto context = isolate->GetCurrentContext();
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gin_helper::EmitEvent(isolate, GetWrapper(), name, event,
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std::forward<Args>(args)...);
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v8::Local<v8::Value> defaultPrevented;
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if (event->Get(context, gin::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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};
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} // namespace gin_helper
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#endif // ELECTRON_SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
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