| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_OBSERVER_H_ |
| #define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_OBSERVER_H_ |
| |
| #include "base/scoped_observer.h" |
| #include "components/keyed_service/core/keyed_service.h" |
| #include "extensions/browser/event_router.h" |
| #include "extensions/browser/extension_registry.h" |
| #include "extensions/browser/extension_registry_observer.h" |
| |
| class Profile; |
| |
| // Profile-keyed class that observes the extension registry to determine load of |
| // extension-based tts engines. |
| class TtsEngineExtensionObserver |
| : public KeyedService, |
| public extensions::EventRouter::Observer, |
| public extensions::ExtensionRegistryObserver { |
| public: |
| static TtsEngineExtensionObserver* GetInstance(Profile* profile); |
| |
| // Returns if this observer saw the given extension load. Adds |extension_id| |
| // as loaded immediately if |update| is set to true. |
| bool SawExtensionLoad(const std::string& extension_id, bool update); |
| |
| // Implementation of KeyedService. |
| virtual void Shutdown() OVERRIDE; |
| |
| // Implementation of extensions::EventRouter::Observer. |
| virtual void OnListenerAdded( |
| const extensions::EventListenerInfo& details) OVERRIDE; |
| |
| // extensions::ExtensionRegistryObserver overrides. |
| virtual void OnExtensionUnloaded( |
| content::BrowserContext* browser_context, |
| const extensions::Extension* extension, |
| extensions::UnloadedExtensionInfo::Reason reason) OVERRIDE; |
| |
| private: |
| explicit TtsEngineExtensionObserver(Profile* profile); |
| virtual ~TtsEngineExtensionObserver(); |
| |
| bool IsLoadedTtsEngine(const std::string& extension_id); |
| |
| ScopedObserver<extensions::ExtensionRegistry, |
| extensions::ExtensionRegistryObserver> |
| extension_registry_observer_; |
| |
| Profile* profile_; |
| |
| bool saw_tts_engine_added_; |
| |
| std::set<std::string> engine_extension_ids_; |
| |
| friend class TtsEngineExtensionObserverFactory; |
| |
| DISALLOW_COPY_AND_ASSIGN(TtsEngineExtensionObserver); |
| }; |
| |
| #endif // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_OBSERVER_H_ |