74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
// Copyright (c) 2019 Slack Technologies, 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_BROWSER_EVENT_EMITTER_MIXIN_H_
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#define ELECTRON_SHELL_BROWSER_EVENT_EMITTER_MIXIN_H_
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#include <utility>
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#include "gin/handle.h"
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#include "gin/object_template_builder.h"
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#include "shell/browser/javascript_environment.h"
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#include "shell/common/gin_helper/event.h"
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#include "shell/common/gin_helper/event_emitter.h"
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namespace gin_helper {
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template <typename T>
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class EventEmitterMixin {
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public:
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// disable copy
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EventEmitterMixin(const EventEmitterMixin&) = delete;
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EventEmitterMixin& operator=(const EventEmitterMixin&) = delete;
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// this.emit(name, new Event(), args...);
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// Returns true if event.preventDefault() was called during processing.
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template <typename... Args>
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bool Emit(base::StringPiece name, Args&&... args) {
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v8::Isolate* isolate = electron::JavascriptEnvironment::GetIsolate();
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v8::HandleScope handle_scope(isolate);
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v8::Local<v8::Object> wrapper;
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if (!static_cast<T*>(this)->GetWrapper(isolate).ToLocal(&wrapper))
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return false;
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gin::Handle<internal::Event> event = internal::Event::New(isolate);
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gin_helper::EmitEvent(isolate, wrapper, name, event,
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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(base::StringPiece name, Args&&... args) {
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v8::Isolate* isolate = electron::JavascriptEnvironment::GetIsolate();
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v8::HandleScope handle_scope(isolate);
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v8::Local<v8::Object> wrapper;
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if (!static_cast<T*>(this)->GetWrapper(isolate).ToLocal(&wrapper))
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return;
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gin_helper::EmitEvent(isolate, wrapper, name, std::forward<Args>(args)...);
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}
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protected:
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EventEmitterMixin() = default;
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gin::ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate) {
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gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
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auto* wrapper_info = &(static_cast<T*>(this)->kWrapperInfo);
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v8::Local<v8::FunctionTemplate> constructor =
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data->GetFunctionTemplate(wrapper_info);
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if (constructor.IsEmpty()) {
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constructor = v8::FunctionTemplate::New(isolate);
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constructor->SetClassName(
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gin::StringToV8(isolate, static_cast<T*>(this)->GetTypeName()));
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constructor->Inherit(internal::GetEventEmitterTemplate(isolate));
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data->SetFunctionTemplate(wrapper_info, constructor);
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}
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return gin::ObjectTemplateBuilder(isolate,
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static_cast<T*>(this)->GetTypeName(),
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constructor->InstanceTemplate());
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}
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};
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} // namespace gin_helper
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#endif // ELECTRON_SHELL_BROWSER_EVENT_EMITTER_MIXIN_H_
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