chrome/browser/ui/webui/translate_internals/translate_internals_handler.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_UI_WEBUI_TRANSLATE_INTERNALS_TRANSLATE_INTERNALS_HANDLER_H_
   6 #define CHROME_BROWSER_UI_WEBUI_TRANSLATE_INTERNALS_TRANSLATE_INTERNALS_HANDLER_H_
   7
   8 #include <string>
   9
  10 #include "base/callback_list.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "components/translate/core/browser/translate_language_list.h"
  13 #include "components/translate/core/browser/translate_manager.h"
  14 #include "content/public/browser/notification_observer.h"
  15 #include "content/public/browser/notification_registrar.h"
  16 #include "content/public/browser/web_ui_message_handler.h"
  17 #include "content/public/common/webplugininfo.h"
  18
  19 namespace translate {
  20 struct LanguageDetectionDetails;
  21 struct TranslateErrorDetails;
  22 struct TranslateEventDetails;
  23 }
  24
  25 namespace base {
  26 class DictionaryValue;
  27 class ListValue;
  28 class Value;
  29 }
  30
  31 namespace content {
  32 class NotificationDetails;
  33 class NotificationSource;
  34 }
  35
  36 // The handler class for TranslateInternals page operations.
  37 class TranslateInternalsHandler : public content::WebUIMessageHandler,
  38                                   public content::NotificationObserver {
  39  public:
  40   TranslateInternalsHandler();
  41   ~TranslateInternalsHandler() override;
  42
  43   // content::WebUIMessageHandler methods:
  44   void RegisterMessages() override;
  45
  46  private:
  47   // content::NotificationObserver implementation:
  48   void Observe(int type,
  49                const content::NotificationSource& source,
  50                const content::NotificationDetails& details) override;
  51
  52   // Callback for translate errors.
  53   void OnTranslateError(const translate::TranslateErrorDetails& details);
  54
  55   // Callback for translate events.
  56   virtual void OnTranslateEvent(
  57       const translate::TranslateEventDetails& details);
  58
  59   // Handles the Javascript message 'removePrefItem'. This message is sent
  60   // when UI requests to remove an item in the preference.
  61   void OnRemovePrefItem(const base::ListValue* args);
  62
  63   // Handles the Javascript message 'requestInfo'. This message is sent
  64   // when UI needs to show information concerned with the translation.
  65   // For now, this returns only prefs to Javascript.
  66   // |args| is not used.
  67   void OnRequestInfo(const base::ListValue* args);
  68
  69   // Sends a messsage to Javascript.
  70   void SendMessageToJs(const std::string& message, const base::Value& value);
  71
  72   // Sends the current preference to Javascript.
  73   void SendPrefsToJs();
  74
  75   // Sends the languages currently supported by the server to JavaScript.
  76   void SendSupportedLanguagesToJs();
  77
  78   // Subscription for translate events coming from the translate language list.
  79   scoped_ptr<translate::TranslateLanguageList::EventCallbackList::Subscription>
  80       event_subscription_;
  81
  82   // Subscription for translate errors coming from the translate manager.
  83   scoped_ptr<
  84       translate::TranslateManager::TranslateErrorCallbackList::Subscription>
  85       error_subscription_;
  86
  87   content::NotificationRegistrar notification_registrar_;
  88
  89   DISALLOW_COPY_AND_ASSIGN(TranslateInternalsHandler);
  90 };
  91
  92 #endif  // CHROME_BROWSER_UI_WEBUI_TRANSLATE_INTERNALS_TRANSLATE_INTERNALS_HANDLER_H_