chrome/browser/speech/tts_extension_loader_chromeos.h

   1 // Copyright 2014 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 "components/keyed_service/core/keyed_service.h"
   9 #include "extensions/browser/event_router.h"
  10
  11 class Profile;
  12
  13 // Profile-keyed class that loads a built-in TTS component extension
  14 // into a given profile on Chrome OS.
  15 class TtsExtensionLoaderChromeOs : public KeyedService,
  16                                    public extensions::EventRouter::Observer {
  17  public:
  18   static TtsExtensionLoaderChromeOs* GetInstance(Profile* profile);
  19
  20   // Returns true if the extension was not previously loaded and is now
  21   // loading. This class will call
  22   // ExtensionTtsController::RetrySpeakingQueuedUtterances when the
  23   // extension finishes loading.
  24   bool LoadTtsExtension();
  25
  26   // Implementation of KeyedService.
  27   virtual void Shutdown() OVERRIDE;
  28
  29   // Implementation of extensions::EventRouter::Observer.
  30   virtual void OnListenerAdded(const extensions::EventListenerInfo& details)
  31       OVERRIDE;
  32
  33  private:
  34   // The state of TTS for this profile.
  35   enum TtsState {
  36     TTS_NOT_LOADED,
  37     TTS_LOAD_REQUESTED,
  38     TTS_LOADING,
  39     TTS_LOADED
  40   };
  41
  42   explicit TtsExtensionLoaderChromeOs(Profile* profile);
  43   virtual ~TtsExtensionLoaderChromeOs() {}
  44
  45   bool IsTtsLoadedInThisProfile();
  46
  47   Profile* profile_;
  48   TtsState tts_state_;
  49
  50   friend class TtsExtensionLoaderChromeOsFactory;
  51
  52   DISALLOW_COPY_AND_ASSIGN(TtsExtensionLoaderChromeOs);
  53 };
  54
  55 #endif  // CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_