96 lines
3.5 KiB
C++
96 lines
3.5 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 SHELL_BROWSER_EVENT_EMITTER_MIXIN_H_
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#define SHELL_BROWSER_EVENT_EMITTER_MIXIN_H_
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#include <utility>
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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_emitter.h"
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namespace gin_helper {
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namespace internal {
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v8::Local<v8::FunctionTemplate> GetEventEmitterTemplate(v8::Isolate* isolate);
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} // namespace internal
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template <typename T>
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class EventEmitterMixin {
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public:
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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::Locker locker(isolate);
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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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v8::Local<v8::Object> event = internal::CreateEvent(isolate, wrapper);
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return EmitWithEvent(isolate, wrapper, name, event,
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std::forward<Args>(args)...);
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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> custom_event,
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Args&&... args) {
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v8::Isolate* isolate = electron::JavascriptEnvironment::GetIsolate();
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v8::HandleScope 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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return EmitWithEvent(isolate, wrapper, name, custom_event,
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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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private:
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// this.emit(name, event, args...);
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template <typename... Args>
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static bool EmitWithEvent(v8::Isolate* isolate,
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v8::Local<v8::Object> wrapper,
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base::StringPiece name,
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v8::Local<v8::Object> event,
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Args&&... args) {
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auto context = isolate->GetCurrentContext();
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gin_helper::EmitEvent(isolate, wrapper, 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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DISALLOW_COPY_AND_ASSIGN(EventEmitterMixin);
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};
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} // namespace gin_helper
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#endif // SHELL_BROWSER_EVENT_EMITTER_MIXIN_H_
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