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Diffstat (limited to 'ext/js/media/audio-system.js')
| -rw-r--r-- | ext/js/media/audio-system.js | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/ext/js/media/audio-system.js b/ext/js/media/audio-system.js index cf63511f..cc2bcfc0 100644 --- a/ext/js/media/audio-system.js +++ b/ext/js/media/audio-system.js @@ -19,18 +19,20 @@ * TextToSpeechAudio */ -class AudioSystem { +class AudioSystem extends EventDispatcher { constructor() { + super(); this._fallbackAudio = null; } prepare() { // speechSynthesis.getVoices() will not be populated unless some API call is made. - if (typeof speechSynthesis === 'undefined') { return; } - - const eventListeners = new EventListenerCollection(); - const onVoicesChanged = () => { eventListeners.removeAllEventListeners(); }; - eventListeners.addEventListener(speechSynthesis, 'voiceschanged', onVoicesChanged, false); + if ( + typeof speechSynthesis !== 'undefined' && + typeof speechSynthesis.addEventListener === 'function' + ) { + speechSynthesis.addEventListener('voiceschanged', this._onVoicesChanged.bind(this), false); + } } getFallbackAudio() { @@ -64,6 +66,10 @@ class AudioSystem { // Private + _onVoicesChanged(e) { + this.trigger('voiceschanged', e); + } + _isAudioValid(audio, source) { switch (source) { case 'jpod101': |