chrome/browser/speech/extension_api/tts_engine_extension_api.h

   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_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
   6 #define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_
   7
   8 #include <vector>
   9
  10 #include "base/memory/singleton.h"
  11 #include "chrome/browser/speech/tts_controller.h"
  12 #include "extensions/browser/extension_function.h"
  13
  14 class Utterance;
  15
  16 namespace base {
  17 class ListValue;
  18 }
  19
  20 namespace content {
  21 class BrowserContext;
  22 }
  23
  24 namespace extensions {
  25 class Extension;
  26 }
  27
  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[];
  33 }
  34
  35 // TtsEngineDelegate implementation used by TtsController.
  36 class TtsExtensionEngine : public TtsEngineDelegate {
  37  public:
  38   static TtsExtensionEngine* GetInstance();
  39
  40   // Overridden from TtsEngineDelegate:
  41   void GetVoices(content::BrowserContext* browser_context,
  42                  std::vector<VoiceData>* out_voices) override;
  43   void Speak(Utterance* utterance, const VoiceData& voice) override;
  44   void Stop(Utterance* utterance) override;
  45   void Pause(Utterance* utterance) override;
  46   void Resume(Utterance* utterance) override;
  47   bool LoadBuiltInTtsExtension(
  48       content::BrowserContext* browser_context) override;
  49 };
  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 {
  53  private:
  54   ~ExtensionTtsEngineSendTtsEventFunction() override {}
  55   bool RunSync() override;
  56   DECLARE_EXTENSION_FUNCTION("ttsEngine.sendTtsEvent", TTSENGINE_SENDTTSEVENT)
  57 };
  58
  59 #endif  // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_H_