chore: remove native_mate (Part 9) (#20645)

* 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
2019-10-21 16:05:40 +09:00 · 2019-10-21 16:05:40 +09:00 · eb0e55c514
commit eb0e55c514
parent b155ebeeb3
38 changed files with 532 additions and 326 deletions
--- a/shell/common/gin_helper/event_emitter.h
+++ b/shell/common/gin_helper/event_emitter.h
@ -0,0 +1,107 @@
+// Copyright (c) 2019 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
+#define SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_
+
+#include <utility>
+#include <vector>
+
+#include "base/optional.h"
+#include "electron/shell/common/api/api.mojom.h"
+#include "shell/common/gin_helper/event_emitter_caller.h"
+
+namespace gin_helper {
+
+namespace internal {
+
+v8::Local<v8::Object> CreateEventObject(v8::Isolate* isolate);
+v8::Local<v8::Object> CreateCustomEvent(v8::Isolate* isolate,
+                                        v8::Local<v8::Object> object,
+                                        v8::Local<v8::Object> event);
+v8::Local<v8::Object> CreateEventFromFlags(v8::Isolate* isolate, int flags);
+
+}  // namespace internal
+
+// Provide helperers to emit event in JavaScript.
+//
+// TODO(zcbenz): Inherit from Wrappable directly after removing native_mate.
+template <typename Base>
+class EventEmitter : public Base {
+ public:
+  typedef std::vector<v8::Local<v8::Value>> ValueArray;
+
+  // Make the convinient methods visible:
+  // https://isocpp.org/wiki/faq/templates#nondependent-name-lookup-members
+  v8::Isolate* isolate() const { return Base::isolate(); }
+  v8::Local<v8::Object> GetWrapper() const { return Base::GetWrapper(); }
+  v8::MaybeLocal<v8::Object> GetWrapper(v8::Isolate* isolate) const {
+    return Base::GetWrapper(isolate);
+  }
+
+  // this.emit(name, event, args...);
+  template <typename... Args>
+  bool EmitCustomEvent(base::StringPiece name,
+                       v8::Local<v8::Object> event,
+                       Args&&... args) {
+    return EmitWithEvent(
+        name, internal::CreateCustomEvent(isolate(), GetWrapper(), event),
+        std::forward<Args>(args)...);
+  }
+
+  // this.emit(name, new Event(flags), args...);
+  template <typename... Args>
+  bool EmitWithFlags(base::StringPiece name, int flags, Args&&... args) {
+    return EmitCustomEvent(name,
+                           internal::CreateEventFromFlags(isolate(), flags),
+                           std::forward<Args>(args)...);
+  }
+
+  // this.emit(name, new Event(), args...);
+  template <typename... Args>
+  bool Emit(base::StringPiece name, Args&&... args) {
+    v8::Locker locker(isolate());
+    v8::HandleScope handle_scope(isolate());
+    v8::Local<v8::Object> wrapper = GetWrapper();
+    if (wrapper.IsEmpty()) {
+      return false;
+    }
+    v8::Local<v8::Object> event = internal::CreateEventObject(isolate());
+    event
+        ->Set(isolate()->GetCurrentContext(),
+              gin::StringToV8(isolate(), "sender"), wrapper)
+        .IsJust();
+    return EmitWithEvent(name, event, std::forward<Args>(args)...);
+  }
+
+ protected:
+  EventEmitter() {}
+
+ private:
+  // this.emit(name, event, args...);
+  template <typename... Args>
+  bool EmitWithEvent(base::StringPiece name,
+                     v8::Local<v8::Object> event,
+                     Args&&... args) {
+    // It's possible that |this| will be deleted by EmitEvent, so save anything
+    // we need from |this| before calling EmitEvent.
+    auto* isolate = this->isolate();
+    v8::Locker locker(isolate);
+    v8::HandleScope handle_scope(isolate);
+    auto context = isolate->GetCurrentContext();
+    EmitEvent(isolate, GetWrapper(), name, event, std::forward<Args>(args)...);
+    v8::Local<v8::Value> defaultPrevented;
+    if (event->Get(context, gin::StringToV8(isolate, "defaultPrevented"))
+            .ToLocal(&defaultPrevented)) {
+      return defaultPrevented->BooleanValue(isolate);
+    }
+    return false;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(EventEmitter);
+};
+
+}  // namespace gin_helper
+
+#endif  // SHELL_COMMON_GIN_HELPER_EVENT_EMITTER_H_