ui/app_list/speech_ui_model_observer.h

   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_OFF = 0,
  16   SPEECH_RECOGNITION_READY,
  17   SPEECH_RECOGNITION_HOTWORD_LISTENING,
  18   SPEECH_RECOGNITION_RECOGNIZING,
  19   SPEECH_RECOGNITION_IN_SPEECH,
  20   SPEECH_RECOGNITION_STOPPING,
  21 };
  22
  23 class APP_LIST_EXPORT SpeechUIModelObserver {
  24  public:
  25   // Invoked when sound level for the speech recognition has changed. |level|
  26   // represents the current sound-level in the range of [0, 255].
  27   virtual void OnSpeechSoundLevelChanged(uint8 level) {}
  28
  29   // Invoked when a speech result arrives. |is_final| is true only when the
  30   // speech result is final.
  31   virtual void OnSpeechResult(const base::string16& result, bool is_final) {}
  32
  33   // Invoked when the state of speech recognition is changed.
  34   virtual void OnSpeechRecognitionStateChanged(
  35       SpeechRecognitionState new_state) {}
  36
  37  protected:
  38   virtual ~SpeechUIModelObserver() {}
  39 };
  40
  41 }  // namespace app_list
  42
  43 #endif  // UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_