chromium/content/public/browser/tts_controller.h

// Copyright 2018 The Chromium Authors
// 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_H_
#define CONTENT_PUBLIC_BROWSER_TTS_CONTROLLER_H_

#include <memory>
#include <queue>
#include <set>
#include <string>
#include <vector>

#include "base/functional/callback_forward.h"
#include "base/memory/singleton.h"
#include "base/observer_list_types.h"
#include "base/scoped_observation_traits.h"
#include "build/chromeos_buildflags.h"
#include "content/common/content_export.h"
#include "content/public/browser/tts_utterance.h"
#include "url/gurl.h"

namespace content {
class BrowserContext;
class TtsPlatform;

// Information about one voice.
struct CONTENT_EXPORT VoiceData { … };

// Interface that delegates TTS requests to engines in content embedders.
class CONTENT_EXPORT TtsEngineDelegate { … };

// Interface that delegates TTS requests to a remote engine from another browser
// process.
class CONTENT_EXPORT RemoteTtsEngineDelegate { … };

// Class that wants to be notified when the set of
// voices has changed.
class CONTENT_EXPORT VoicesChangedDelegate : public base::CheckedObserver { … };

// Singleton class that manages text-to-speech for all TTS engines and
// APIs, maintaining a queue of pending utterances and keeping
// track of all state.
class CONTENT_EXPORT TtsController { … };

}  // namespace content

namespace base {

template <>
struct ScopedObservationTraits<content::TtsController,
                               content::VoicesChangedDelegate> { … };

}  // namespace base

#endif  // CONTENT_PUBLIC_BROWSER_TTS_CONTROLLER_H_