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// Copyright 2017 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_SPEECH_SPEECH_SYNTHESIS_H_
#define COBALT_SPEECH_SPEECH_SYNTHESIS_H_
#include <list>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "cobalt/dom/event_target.h"
#include "cobalt/script/sequence.h"
#include "cobalt/script/wrappable.h"
#include "cobalt/speech/speech_synthesis_utterance.h"
#include "cobalt/speech/speech_synthesis_voice.h"
#include "starboard/system.h"
namespace cobalt {
namespace dom {
// Forward declare Navigator, so that we don't pull in it's dependency on
// media_session.
class Navigator;
} // namespace dom
namespace speech {
// The speech synthesis interface is the scripted web API for controlling a
// given speech synthesis.
// https://dvcs.w3.org/hg/speech-api/raw-file/4f41ea1126bb/webspeechapi.html#tts-section
class SpeechSynthesis : public dom::EventTarget {
public:
typedef script::Sequence<scoped_refptr<SpeechSynthesisVoice> >
SpeechSynthesisVoiceSequence;
explicit SpeechSynthesis(const scoped_refptr<dom::Navigator>& navigator);
// Readonly Attributes.
bool pending() const { return !utterances_.empty(); }
bool speaking() const { return false; }
bool paused() const { return paused_; }
// EventHandlers.
const EventListenerScriptValue* onvoiceschanged() const {
return GetAttributeEventListener(base::Tokens::voiceschanged());
}
void set_onvoiceschanged(const EventListenerScriptValue& event_listener);
// Functions.
void Speak(const scoped_refptr<SpeechSynthesisUtterance>& utterance);
void Cancel();
void Pause() { paused_ = true; }
void Resume();
SpeechSynthesisVoiceSequence GetVoices() const { return voices_; }
DEFINE_WRAPPABLE_TYPE(SpeechSynthesis);
private:
~SpeechSynthesis() OVERRIDE;
void DispatchErrorEvent(
const scoped_refptr<SpeechSynthesisUtterance>& utterance,
SpeechSynthesisErrorCode error_code);
bool paused_;
typedef std::list<scoped_refptr<SpeechSynthesisUtterance> > UtterancesList;
UtterancesList utterances_;
SpeechSynthesisVoiceSequence voices_;
scoped_refptr<dom::Navigator> navigator_;
DISALLOW_COPY_AND_ASSIGN(SpeechSynthesis);
};
} // namespace speech
} // namespace cobalt
#endif // COBALT_SPEECH_SPEECH_SYNTHESIS_H_