chrome/browser/speech/chrome_speech_recognition_manager_delegate.h

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_SPEECH_CHROME_SPEECH_RECOGNITION_MANAGER_DELEGATE_H_
#define CHROME_BROWSER_SPEECH_CHROME_SPEECH_RECOGNITION_MANAGER_DELEGATE_H_

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "content/public/browser/speech_recognition_event_listener.h"
#include "content/public/browser/speech_recognition_manager_delegate.h"
#include "content/public/browser/speech_recognition_session_config.h"

namespace speech {

// This is Chrome's implementation of the SpeechRecognitionManagerDelegate
// interface.
class ChromeSpeechRecognitionManagerDelegate
    : public content::SpeechRecognitionManagerDelegate,
      public content::SpeechRecognitionEventListener {
 public:
  ChromeSpeechRecognitionManagerDelegate();
  ~ChromeSpeechRecognitionManagerDelegate() override;

 protected:
  // SpeechRecognitionEventListener methods.
  void OnRecognitionStart(int session_id) override;
  void OnAudioStart(int session_id) override;
  void OnEnvironmentEstimationComplete(int session_id) override;
  void OnSoundStart(int session_id) override;
  void OnSoundEnd(int session_id) override;
  void OnAudioEnd(int session_id) override;
  void OnRecognitionEnd(int session_id) override;
  void OnRecognitionResults(
      int session_id,
      const content::SpeechRecognitionResults& result) override;
  void OnRecognitionError(
      int session_id,
      const content::SpeechRecognitionError& error) override;
  void OnAudioLevelsChange(int session_id,
                           float volume,
                           float noise_volume) override;

  // SpeechRecognitionManagerDelegate methods.
  void CheckRecognitionIsAllowed(
      int session_id,
      base::Callback<void(bool ask_user, bool is_allowed)> callback) override;
  content::SpeechRecognitionEventListener* GetEventListener() override;
  bool FilterProfanities(int render_process_id) override;

  // Callback called by |tab_watcher_| on the IO thread to signal tab closure.
  virtual void TabClosedCallback(int render_process_id, int render_view_id);

 private:
  class TabWatcher;

  // Checks for VIEW_TYPE_TAB_CONTENTS host in the UI thread and notifies back
  // the result in the IO thread through |callback|.
  static void CheckRenderViewType(
      base::Callback<void(bool ask_user, bool is_allowed)> callback,
      int render_process_id,
      int render_view_id);

  scoped_refptr<TabWatcher> tab_watcher_;

  DISALLOW_COPY_AND_ASSIGN(ChromeSpeechRecognitionManagerDelegate);
};

}  // namespace speech

#endif  // CHROME_BROWSER_SPEECH_CHROME_SPEECH_RECOGNITION_MANAGER_DELEGATE_H_