chrome/browser/ui/app_list/speech_recognizer_delegate.h

   1 // Copyright 2014 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_UI_APP_LIST_SPEECH_RECOGNIZER_DELEGATE_H_
   6 #define CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_DELEGATE_H_
   7
   8 #include <stdint.h>
   9 #include <string>
  10
  11 #include "base/strings/string16.h"
  12 #include "ui/app_list/speech_ui_model_observer.h"
  13
  14 namespace content {
  15 class WebContents;
  16 }
  17
  18 namespace app_list {
  19
  20 // Delegate for the app list speech recognizer. All methods are called from the
  21 // UI thread.
  22 class SpeechRecognizerDelegate {
  23  public:
  24   // Receive a speech recognition result. |is_final| indicated whether the
  25   // result is an intermediate or final result. If |is_final| is true, then the
  26   // recognizer stops and no more results will be returned.
  27   virtual void OnSpeechResult(const base::string16& query, bool is_final) = 0;
  28
  29   // Invoked regularly to indicate the average sound volume.
  30   virtual void OnSpeechSoundLevelChanged(int16_t level) = 0;
  31
  32   // Invoked when the state of speech recognition is changed.
  33   virtual void OnSpeechRecognitionStateChanged(
  34       SpeechRecognitionState new_state) = 0;
  35
  36   // Get the OAuth2 scope and token to pass to the speech recognizer. Does not
  37   // modify the arguments if no auth token is available or allowed.
  38   virtual void GetSpeechAuthParameters(std::string* auth_scope,
  39                                        std::string* auth_token) = 0;
  40
  41  protected:
  42   virtual ~SpeechRecognizerDelegate() {}
  43 };
  44
  45 }  // namespace app_list
  46
  47 #endif  // CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_DELEGATE_H_