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.
5 #ifndef CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
6 #define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
10 #include "base/memory/singleton.h"
11 #include "chrome/browser/speech/tts_controller.h"
12 #include "extensions/browser/extension_function.h"
24 namespace extensions {
28 namespace tts_engine_events {
29 extern const char kOnSpeak[];
30 extern const char kOnStop[];
31 extern const char kOnPause[];
32 extern const char kOnResume[];
35 // TtsEngineDelegate implementation used by TtsController.
36 class TtsExtensionEngine : public TtsEngineDelegate {
38 static TtsExtensionEngine* GetInstance();
40 // Overridden from TtsEngineDelegate:
41 virtual void GetVoices(content::BrowserContext* browser_context,
42 std::vector<VoiceData>* out_voices) OVERRIDE;
43 virtual void Speak(Utterance* utterance, const VoiceData& voice) OVERRIDE;
44 virtual void Stop(Utterance* utterance) OVERRIDE;
45 virtual void Pause(Utterance* utterance) OVERRIDE;
46 virtual void Resume(Utterance* utterance) OVERRIDE;
47 virtual bool LoadBuiltInTtsExtension(
48 content::BrowserContext* browser_context) OVERRIDE;
50 // Hidden/internal extension function used to allow TTS engine extensions
51 // to send events back to the client that's calling tts.speak().
52 class ExtensionTtsEngineSendTtsEventFunction : public SyncExtensionFunction {
54 virtual ~ExtensionTtsEngineSendTtsEventFunction() {}
55 virtual bool RunSync() OVERRIDE;
56 DECLARE_EXTENSION_FUNCTION("ttsEngine.sendTtsEvent", TTSENGINE_SENDTTSEVENT)
59 #endif // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_