refactor: rename the atom directory to shell

shell/browser/api/event_emitter.h

@@ -0,0 +1,125 @@
+// Copyright (c) 2014 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_EVENT_EMITTER_H_
+#define ATOM_BROWSER_API_EVENT_EMITTER_H_
+
+#include <utility>
+#include <vector>
+
+#include "atom/common/api/event_emitter_caller.h"
+#include "base/optional.h"
+#include "content/public/browser/browser_thread.h"
+#include "electron/atom/common/api/api.mojom.h"
+#include "native_mate/wrappable.h"
+
+namespace content {
+class RenderFrameHost;
+}
+
+namespace mate {
+
+namespace internal {
+
+v8::Local<v8::Object> CreateJSEvent(
+    v8::Isolate* isolate,
+    v8::Local<v8::Object> object,
+    content::RenderFrameHost* sender,
+    base::Optional<atom::mojom::ElectronBrowser::MessageSyncCallback> callback);
+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.
+template <typename T>
+class EventEmitter : public Wrappable<T> {
+ 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 Wrappable<T>::isolate(); }
+  v8::Local<v8::Object> GetWrapper() const {
+    return Wrappable<T>::GetWrapper();
+  }
+  v8::MaybeLocal<v8::Object> GetWrapper(v8::Isolate* isolate) const {
+    return Wrappable<T>::GetWrapper(isolate);
+  }
+
+  // this.emit(name, event, args...);
+  template <typename... Args>
+  bool EmitCustomEvent(const 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(const 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(const base::StringPiece& name, Args&&... args) {
+    return EmitWithSender(name, nullptr, base::nullopt,
+                          std::forward<Args>(args)...);
+  }
+
+  // this.emit(name, new Event(sender, message), args...);
+  template <typename... Args>
+  bool EmitWithSender(
+      const base::StringPiece& name,
+      content::RenderFrameHost* sender,
+      base::Optional<atom::mojom::ElectronBrowser::MessageSyncCallback>
+          callback,
+      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::CreateJSEvent(
+        isolate(), wrapper, sender, std::move(callback));
+    return EmitWithEvent(name, event, std::forward<Args>(args)...);
+  }
+
+ protected:
+  EventEmitter() {}
+
+ private:
+  // this.emit(name, event, args...);
+  template <typename... Args>
+  bool EmitWithEvent(const base::StringPiece& name,
+                     v8::Local<v8::Object> event,
+                     Args&&... args) {
+    DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+    v8::Locker locker(isolate());
+    v8::HandleScope handle_scope(isolate());
+    EmitEvent(isolate(), GetWrapper(), name, event,
+              std::forward<Args>(args)...);
+    auto context = isolate()->GetCurrentContext();
+    v8::Local<v8::Value> defaultPrevented;
+    if (event->Get(context, StringToV8(isolate(), "defaultPrevented"))
+            .ToLocal(&defaultPrevented)) {
+      return defaultPrevented->BooleanValue(isolate());
+    }
+    return false;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(EventEmitter);
+};
+
+}  // namespace mate
+
+#endif  // ATOM_BROWSER_API_EVENT_EMITTER_H_