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/browser_context_keyed_service/browser_context_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
  16     : public BrowserContextKeyedService,
  17       public extensions::EventRouter::Observer {
  18  public:
  19   static TtsExtensionLoaderChromeOs* GetInstance(Profile* profile);
  20
  21   // Returns true if the extension was not previously loaded and is now
  22   // loading. This class will call
  23   // ExtensionTtsController::RetrySpeakingQueuedUtterances when the
  24   // extension finishes loading.
  25   bool LoadTtsExtension();
  26
  27   // Implementation of BrowserContextKeyedService.
  28   virtual void Shutdown() OVERRIDE;
  29
  30   // Implementation of extensions::EventRouter::Observer.
  31   virtual void OnListenerAdded(const extensions::EventListenerInfo& details)
  32       OVERRIDE;
  33
  34  private:
  35   // The state of TTS for this profile.
  36   enum TtsState {
  37     TTS_NOT_LOADED,
  38     TTS_LOAD_REQUESTED,
  39     TTS_LOADING,
  40     TTS_LOADED
  41   };
  42
  43   explicit TtsExtensionLoaderChromeOs(Profile* profile);
  44   virtual ~TtsExtensionLoaderChromeOs() {}
  45
  46   bool IsTtsLoadedInThisProfile();
  47
  48   Profile* profile_;
  49   TtsState tts_state_;
  50
  51   friend class TtsExtensionLoaderChromeOsFactory;
  52
  53   DISALLOW_COPY_AND_ASSIGN(TtsExtensionLoaderChromeOs);
  54 };
  55
  56 #endif  // CHROME_BROWSER_SPEECH_TTS_EXTENSION_LOADER_CHROMEOS_H_