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 "components/browser_context_keyed_service/browser_context_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 BrowserContextKeyedService, 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_ 52
