3 files changed, 161 insertions, 4 deletions

diff --git a/chrome/browser/translate/translate_infobars_delegates.cc b/chrome/browser/translate/translate_infobars_delegates.cc
index ecf0a95..15d165b 100644
--- a/chrome/browser/translate/translate_infobars_delegates.cc
+++ b/chrome/browser/translate/translate_infobars_delegates.cc
@@ -93,10 +93,7 @@ void TranslateInfoBarDelegate::GetAvailableTargetLanguages(
 }
 
 void TranslateInfoBarDelegate::Translate() {
-  // TODO(kuan): Call actual Translate method.
-/*
-  Translate(WideToUTF8(original_language()), WideToUTF8(target_language()));
-*/
+  tab_contents_->TranslatePage(original_language_, target_language_);
 }
 
 bool TranslateInfoBarDelegate::IsLanguageBlacklisted() {
diff --git a/chrome/browser/translate/translate_manager.cc b/chrome/browser/translate/translate_manager.cc
new file mode 100644
index 0000000..5a7938a
--- /dev/null
+++ b/chrome/browser/translate/translate_manager.cc
@@ -0,0 +1,113 @@
+// 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/translate_manager.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/profile.h"
+#include "chrome/browser/renderer_host/translation_service.h"
+#include "chrome/browser/tab_contents/navigation_controller.h"
+#include "chrome/browser/tab_contents/navigation_entry.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/translate/translate_infobars_delegates.h"
+#include "chrome/browser/translate/translate_prefs.h"
+#include "chrome/common/notification_details.h"
+#include "chrome/common/notification_service.h"
+#include "chrome/common/notification_source.h"
+#include "chrome/common/notification_type.h"
+#include "chrome/common/pref_service.h"
+
+TranslateManager::~TranslateManager() {
+}
+
+void TranslateManager::Observe(NotificationType type,
+                               const NotificationSource& source,
+                               const NotificationDetails& details) {
+  switch (type.value) {
+    case NotificationType::NAV_ENTRY_COMMITTED: {
+      // We have navigated to a new page.
+      NavigationController* controller =
+          Source<NavigationController>(source).ptr();
+      NavigationEntry* entry = controller->GetActiveEntry();
+      if (!entry->language().empty()) {
+        // The language for that page is known (it must be a back/forward
+        // navigation to a page we already visited).
+        InitiateTranslation(controller->tab_contents(), entry->language());
+      }
+      break;
+    }
+    case NotificationType::TAB_LANGUAGE_DETERMINED: {
+      TabContents* tab = Source<TabContents>(source).ptr();
+      std::string language = *(Details<std::string>(details).ptr());
+      InitiateTranslation(tab, language);
+      break;
+    }
+    case NotificationType::PAGE_TRANSLATED: {
+      TabContents* tab = Source<TabContents>(source).ptr();
+      std::pair<std::string, std::string>* language_pair =
+          (Details<std::pair<std::string, std::string> >(details).ptr());
+      PrefService* prefs = GetPrefService(tab);
+      tab->AddInfoBar(new AfterTranslateInfoBarDelegate(tab, prefs,
+                                                        language_pair->first,
+                                                        language_pair->second));
+      break;
+    }
+    default:
+      NOTREACHED();
+  }
+}
+
+TranslateManager::TranslateManager() {
+  if (!TranslationService::IsTranslationEnabled())
+    return;
+
+  notification_registrar_.Add(this, NotificationType::NAV_ENTRY_COMMITTED,
+                              NotificationService::AllSources());
+  notification_registrar_.Add(this, NotificationType::TAB_LANGUAGE_DETERMINED,
+                              NotificationService::AllSources());
+  notification_registrar_.Add(this, NotificationType::PAGE_TRANSLATED,
+                              NotificationService::AllSources());
+}
+
+void TranslateManager::InitiateTranslation(TabContents* tab,
+                                           const std::string& page_lang) {
+  PrefService* prefs = GetPrefService(tab);
+  NavigationEntry* entry = tab->controller().GetActiveEntry();
+  if (!entry) {
+    NOTREACHED();
+    return;
+  }
+
+  std::string chrome_lang = g_browser_process->GetApplicationLocale();
+
+  // We don't want to translate:
+  // - any Chrome specific page (New Tab Page, Download, History... pages).
+  // - similar languages (ex: en-US to en).
+  // - any user black-listed URLs or user selected language combination.
+  if (entry->url().SchemeIs("chrome") || page_lang == chrome_lang ||
+      !TranslationService::ShouldTranslatePage(page_lang, chrome_lang) ||
+      !TranslatePrefs::CanTranslate(prefs, page_lang, entry->url())) {
+    return;
+  }
+  if (TranslatePrefs::ShouldAutoTranslate(prefs, page_lang, chrome_lang)) {
+    // The user has previously select "always translate" for this language.
+    tab->TranslatePage(page_lang, chrome_lang);
+    return;
+  }
+
+  // Prompts the user if he/she wants the page translated.
+  tab->AddInfoBar(new BeforeTranslateInfoBarDelegate(tab, prefs,
+                                                     entry->url(),
+                                                     page_lang, chrome_lang));
+}
+
+PrefService* TranslateManager::GetPrefService(TabContents* tab) {
+  PrefService* prefs = NULL;
+  if (tab->profile())
+    prefs = tab->profile()->GetPrefs();
+  if (prefs)
+    return prefs;
+
+  return g_browser_process->local_state();
+}
diff --git a/chrome/browser/translate/translate_manager.h b/chrome/browser/translate/translate_manager.h
new file mode 100644
index 0000000..b51f089
--- /dev/null
+++ b/chrome/browser/translate/translate_manager.h
@@ -0,0 +1,47 @@
+// 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.
+
+#ifndef CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_
+#define CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_
+
+#include <string>
+
+#include "base/singleton.h"
+#include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_registrar.h"
+
+class PrefService;
+class TabContents;
+
+// The TranslateManager class is responsible for showing an info-bar when a page
+// in a language different than the user language is loaded.  It triggers the
+// page translation the user requests.
+// It is a singleton.
+
+class TranslateManager : public NotificationObserver {
+ public:
+  virtual ~TranslateManager();
+
+  // NotificationObserver implementation:
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+ private:
+  friend struct DefaultSingletonTraits<TranslateManager>;
+
+  TranslateManager();
+
+  // Starts the translation process on |tab| containing the page in the
+  // |page_lang| language.
+  void InitiateTranslation(TabContents* tab, const std::string& page_lang);
+
+  // Convenience method that retrieves the PrefService.
+  PrefService* GetPrefService(TabContents* tab);
+
+  NotificationRegistrar notification_registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(TranslateManager);
+};
+
+#endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_