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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
function VoiceInput(keyboard) {
this.finaResult_ = null;
this.recognizing_ = false;
this.keyboard_ = keyboard;
this.recognition_ = new webkitSpeechRecognition();
this.recognition_.onstart = this.onStartHandler.bind(this);
this.recognition_.onresult = this.onResultHandler.bind(this);
this.recognition_.onerror = this.onErrorHandler.bind(this);
this.recognition_.onend = this.onEndHandler.bind(this);
};
VoiceInput.prototype = {
/**
* Event handler for mouse/touch down events.
*/
onDown: function() {
if (this.recognizing_) {
this.recognition_.stop();
return;
}
this.recognition_.start();
},
/**
* Speech recognition started. Change microphone key's icon.
*/
onStartHandler: function() {
this.recognizing_ = true;
this.finalResult_ = '';
if (!this.keyboard_.classList.contains('audio'))
this.keyboard_.classList.add('audio');
},
/**
* Speech recognizer returns a result.
* @param{Event} e The SpeechRecognition event that is raised each time
* there
* are any changes to interim or final results.
*/
onResultHandler: function(e) {
for (var i = e.resultIndex; i < e.results.length; i++) {
if (e.results[i].isFinal)
this.finalResult_ = e.results[i][0].transcript;
}
insertText(this.finalResult_);
},
/**
* Speech recognizer returns an error.
* @param{Event} e The SpeechRecognitionError event that is raised each time
* there is an error.
*/
onErrorHandler: function(e) {
console.error('error code = ' + e.error);
},
/**
* Speech recognition ended. Reset microphone key's icon.
*/
onEndHandler: function() {
if (this.keyboard_.classList.contains('audio'))
this.keyboard_.classList.remove('audio');
this.recognizing_ = false;
}
};
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