Add native_mate implemented Event and EventEmitter.

atom/browser/api/event_emitter.cc

@@ -0,0 +1,53 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/api/event_emitter.h"
+
+#include <vector>
+
+#include "atom/browser/api/event.h"
+#include "atom/common/native_mate_converters/v8_value_converter.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+
+#include "atom/common/node_includes.h"
+
+namespace mate {
+
+EventEmitter::EventEmitter() {
+}
+
+bool EventEmitter::Emit(const base::StringPiece& name) {
+  return Emit(name, base::ListValue());
+}
+
+bool EventEmitter::Emit(const base::StringPiece& name,
+                        const base::ListValue& args) {
+  v8::Locker locker(node_isolate);
+  v8::HandleScope handle_scope(node_isolate);
+
+  v8::Handle<v8::Context> context = v8::Context::GetCurrent();
+  scoped_ptr<atom::V8ValueConverter> converter(new atom::V8ValueConverter);
+
+  mate::Handle<mate::Event> event = mate::Event::Create(node_isolate);
+
+  // v8_args = [name, event, args...];
+  std::vector<v8::Handle<v8::Value>> v8_args;
+  v8_args.reserve(args.GetSize() + 2);
+  v8_args.push_back(mate::StringToV8(node_isolate, name));
+  v8_args.push_back(event.ToV8());
+  for (size_t i = 0; i < args.GetSize(); i++) {
+    const base::Value* value(NULL);
+    if (args.Get(i, &value))
+      v8_args.push_back(converter->ToV8Value(value, context));
+  }
+
+  // this.emit.apply(this, v8_args);
+  node::MakeCallback(
+      GetWrapper(node_isolate), "emit", v8_args.size(), &v8_args[0]);
+
+  return event->prevent_default();
+}
+
+}  // namespace mate