chrome/browser/speech/tts_extension_loader_chromeos.h

   1 // Copyright (c) 2012 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_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_
   6 #define CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_
   7
   8 #include "chrome/browser/extensions/event_router.h"
   9 #include "chrome/browser/profiles/profile_keyed_service.h"
  10
  11 // Profile-keyed class that loads a built-in TTS component extension
  12 // into a given profile on Chrome OS.
  13 class TtsExtensionLoaderChromeOs
  14     : public ProfileKeyedService,
  15       public extensions::EventRouter::Observer {
  16  public:
  17   static TtsExtensionLoaderChromeOs* GetInstance(Profile* profile);
  18
  19   // Returns true if the extension was not previously loaded and is now
  20   // loading. This class will call
  21   // ExtensionTtsController::RetrySpeakingQueuedUtterances when the
  22   // extension finishes loading.
  23   bool LoadTtsExtension();
  24
  25   // Implementation of extensions::EventRouter::Observer.
  26   virtual void OnListenerAdded(const extensions::EventListenerInfo& details)
  27       OVERRIDE;
  28
  29  private:
  30   // The state of TTS for this profile.
  31   enum TtsState {
  32     TTS_NOT_LOADED,
  33     TTS_LOAD_REQUESTED,
  34     TTS_LOADING,
  35     TTS_LOADED
  36   };
  37
  38   explicit TtsExtensionLoaderChromeOs(Profile* profile);
  39   virtual ~TtsExtensionLoaderChromeOs() {}
  40
  41   bool IsTtsLoadedInThisProfile();
  42
  43   Profile* profile_;
  44   TtsState tts_state_;
  45
  46   friend class TtsExtensionLoaderChromeOsFactory;
  47
  48   DISALLOW_COPY_AND_ASSIGN(TtsExtensionLoaderChromeOs);
  49 };
  50
  51 #endif  // CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_