Refactored the translate infobars.

chrome/browser/translate/languages_menu_model2.cc

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/translate/languages_menu_model2.h"
+
+#include "base/histogram.h"
+#include "chrome/browser/translate/translate_infobar_delegate2.h"
+
+LanguagesMenuModel2::LanguagesMenuModel2(
+    TranslateInfoBarDelegate2* translate_delegate,
+    LanguageType language_type)
+    : ALLOW_THIS_IN_INITIALIZER_LIST(menus::SimpleMenuModel(this)),
+      translate_infobar_delegate_(translate_delegate),
+      language_type_(language_type) {
+  for (int i = 0; i < translate_delegate->GetLanguageCount(); ++i)
+    AddCheckItem(i, translate_delegate->GetLanguageDisplayableNameAt(i));
+}
+
+LanguagesMenuModel2::~LanguagesMenuModel2() {
+}
+
+bool LanguagesMenuModel2::IsCommandIdChecked(int command_id) const {
+  if (language_type_ == ORIGINAL)
+    return command_id == translate_infobar_delegate_->original_language_index();
+  return command_id == translate_infobar_delegate_->target_language_index();
+}
+
+bool LanguagesMenuModel2::IsCommandIdEnabled(int command_id) const {
+  // Prevent from having the same language selectable in original and target.
+  if (language_type_ == ORIGINAL)
+    return true;
+  return command_id != translate_infobar_delegate_->original_language_index();
+}
+
+bool LanguagesMenuModel2::GetAcceleratorForCommandId(
+    int command_id, menus::Accelerator* accelerator) {
+  return false;
+}
+
+void LanguagesMenuModel2::ExecuteCommand(int command_id) {
+  if (language_type_ == ORIGINAL) {
+    UMA_HISTOGRAM_COUNTS("Translate.ModifyOriginalLang", 1);
+    translate_infobar_delegate_->SetOriginalLanguage(command_id);
+    return;
+  }
+  UMA_HISTOGRAM_COUNTS("Translate.ModifyTargetLang", 1);
+  translate_infobar_delegate_->SetTargetLanguage(command_id);
+}