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
12namespace app_list {
13
14enum 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  SPEECH_RECOGNITION_NETWORK_ERROR,
22};
23
24class APP_LIST_EXPORT SpeechUIModelObserver {
25 public:
26  // Invoked when sound level for the speech recognition has changed. |level|
27  // represents the current sound-level in the range of [0, 255].
28  virtual void OnSpeechSoundLevelChanged(uint8 level) {}
29
30  // Invoked when a speech result arrives. |is_final| is true only when the
31  // speech result is final.
32  virtual void OnSpeechResult(const base::string16& result, bool is_final) {}
33
34  // Invoked when the state of speech recognition is changed.
35  virtual void OnSpeechRecognitionStateChanged(
36      SpeechRecognitionState new_state) {}
37
38 protected:
39  virtual ~SpeechUIModelObserver() {}
40};
41
42}  // namespace app_list
43
44#endif  // UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_
45