f36ceae024
* chore: migrate from base::StringPiece to std::string_view in keyboard_util.cc * chore: migrate from base::StringPiece to std::string_view in error_thrower.cc * chore: migrate from base::StringPiece to std::string_view in electron_api_web_contents.cc * chore: migrate from base::StringPiece to std::string_view in gin_helper/dictionary.h * chore: migrate from base::StringPiece to std::string_view in electron_api_url_loader.cc * chore: phase out internal use of base:::StringPiece `base::StringPiece` is being phased out upstream. Its code has been removed upstream and it's just a typedef for `std::string_view`. They haven't removed the typedef yet, so this PR tries to get ahead of future breakage by migrating "internal" use (i.e. leaving alone the places where the `base::StringPiece` name is coming from an upstream method that we override). Xref: https://bugs.chromium.org/p/chromium/issues/detail?id=691162 Xref: https://chromium-review.googlesource.com/c/chromium/src/+/4294483 Xref: https://docs.google.com/document/d/1d4RnD1uAE2t4iANR0nXy82ASIPGsPuw2mpO6v6T7JKs
76 lines
2.5 KiB
C++
76 lines
2.5 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 <string_view>
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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 "gin/handle.h"
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#include "shell/common/gin_helper/event.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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// Provide helpers 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 convenient 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, new Event(), args...);
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template <typename... Args>
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bool Emit(const std::string_view name, Args&&... args) {
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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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gin::Handle<gin_helper::internal::Event> event =
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internal::Event::New(isolate());
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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(const std::string_view name,
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gin::Handle<gin_helper::internal::Event> 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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gin_helper::EmitEvent(isolate, GetWrapper(), 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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};
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} // namespace gin_helper
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#endif // ELECTRON_SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
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