eb0e55c514
* refactor: remove a few uses of native_mate/gfx_converter.h * refactor: deprecate mate::EventEmitter * refactor: add gin_helper::EventEmitter * refactor: convert a few classes to use gin_helper::EventEmitter * refactor: get rid of native_mate_converters/gfx_converter.h * fix: follow native_mate on reporting errors * fix: gin is weak at guessing parameter types * fix: incorrect full class name * fix: gin::Handle does not accept null
107 lines
3.6 KiB
C++
107 lines
3.6 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 SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
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#define SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
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#include <utility>
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#include <vector>
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#include "base/optional.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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namespace gin_helper {
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namespace internal {
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v8::Local<v8::Object> CreateEventObject(v8::Isolate* isolate);
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v8::Local<v8::Object> CreateCustomEvent(v8::Isolate* isolate,
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v8::Local<v8::Object> object,
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v8::Local<v8::Object> event);
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v8::Local<v8::Object> CreateEventFromFlags(v8::Isolate* isolate, int flags);
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} // namespace internal
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// Provide helperers to emit event in JavaScript.
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//
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// TODO(zcbenz): Inherit from Wrappable directly after removing native_mate.
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template <typename Base>
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class EventEmitter : public Base {
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public:
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typedef std::vector<v8::Local<v8::Value>> ValueArray;
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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(flags), args...);
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template <typename... Args>
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bool EmitWithFlags(base::StringPiece name, int flags, Args&&... args) {
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return EmitCustomEvent(name,
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internal::CreateEventFromFlags(isolate(), flags),
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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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}
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v8::Local<v8::Object> event = internal::CreateEventObject(isolate());
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event
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->Set(isolate()->GetCurrentContext(),
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gin::StringToV8(isolate(), "sender"), wrapper)
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.IsJust();
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return EmitWithEvent(name, event, std::forward<Args>(args)...);
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}
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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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v8::Locker locker(isolate);
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v8::HandleScope handle_scope(isolate);
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auto context = isolate->GetCurrentContext();
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EmitEvent(isolate, GetWrapper(), name, event, 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(EventEmitter);
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};
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} // namespace gin_helper
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#endif // SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
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