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      1 // Copyright 2013 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 UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_
      6 #define UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/strings/string16.h"
     10 #include "ui/app_list/app_list_export.h"
     11 
     12 namespace app_list {
     13 
     14 enum SpeechRecognitionState {
     15   SPEECH_RECOGNITION_NOT_STARTED = 0,
     16   SPEECH_RECOGNITION_ON,
     17   SPEECH_RECOGNITION_IN_SPEECH,
     18 };
     19 
     20 class APP_LIST_EXPORT SpeechUIModelObserver {
     21  public:
     22   // Invoked when sound level for the speech recognition has changed.
     23   virtual void OnSpeechSoundLevelChanged(int16 level) {}
     24 
     25   // Invoked when a speech result arrives. |is_final| is true only when the
     26   // speech result is final.
     27   virtual void OnSpeechResult(const base::string16& result, bool is_final) {}
     28 
     29   // Invoked when the state of speech recognition is changed.
     30   virtual void OnSpeechRecognitionStateChanged(
     31       SpeechRecognitionState new_state) {}
     32 
     33  protected:
     34   virtual ~SpeechUIModelObserver() {}
     35 };
     36 
     37 }  // namespace app_list
     38 
     39 #endif  // UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_
     40