content/public/browser/tts_controller_delegate.h

// Copyright (c) 2018 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 CONTENT_PUBLIC_BROWSER_TTS_CONTROLLER_DELEGATE_H_
#define CONTENT_PUBLIC_BROWSER_TTS_CONTROLLER_DELEGATE_H_

#include "content/public/browser/tts_controller.h"
#include "content/public/browser/tts_utterance.h"

namespace content {

// Allows embedders to access the current state of text-to-speech.
class TtsControllerDelegate {
 public:
  // Given an utterance and a vector of voices, return the
  // index of the voice that best matches the utterance.
  virtual int GetMatchingVoice(const TtsUtterance* utterance,
                               std::vector<VoiceData>& voices) = 0;

  // Uses the user preferences to update the |rate|, |pitch| and |volume| for
  // a given |utterance|.
  virtual void UpdateUtteranceDefaultsFromPrefs(TtsUtterance* utterance,
                                                double* rate,
                                                double* pitch,
                                                double* volume) = 0;

  // Set the delegate that processes TTS requests with user-installed
  // extensions.
  virtual void SetTtsEngineDelegate(TtsEngineDelegate* delegate) = 0;

  // Get the delegate that processes TTS requests with user-installed
  // extensions.
  virtual TtsEngineDelegate* GetTtsEngineDelegate() = 0;

 protected:
  virtual ~TtsControllerDelegate() {}
};

}  // namespace content

#endif  // CONTENT_PUBLIC_BROWSER_TTS_CONTROLLER_DELEGATE_H_