133 lines
3.2 KiB
JavaScript
133 lines
3.2 KiB
JavaScript
import React, { PureComponent } from 'react';
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import { JitsiTrackEvents } from '../../base/lib-jitsi-meet';
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/**
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* React component for displaying a audio level meter for a JitsiLocalTrack.
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*/
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class AudioInputPreview extends PureComponent {
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/**
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* AudioInputPreview component's property types.
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*
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* @static
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*/
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static propTypes = {
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/*
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* The JitsiLocalTrack to show an audio level meter for.
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*/
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track: React.PropTypes.object
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}
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/**
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* Initializes a new AudioInputPreview instance.
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*
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* @param {Object} props - The read-only React Component props with which
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* the new instance is to be initialized.
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*/
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constructor(props) {
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super(props);
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this.state = {
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audioLevel: 0
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};
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this._updateAudioLevel = this._updateAudioLevel.bind(this);
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}
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/**
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* Starts listening for audio level updates after the initial render.
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*
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* @inheritdoc
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* @returns {void}
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*/
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componentDidMount() {
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this._listenForAudioUpdates(this.props.track);
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}
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/**
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* Stops listening for audio level updates on the old track and starts
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* listening instead on the new track.
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*
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* @inheritdoc
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* @returns {void}
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*/
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componentWillReceiveProps(nextProps) {
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this._listenForAudioUpdates(nextProps.track);
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this._updateAudioLevel(0);
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}
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/**
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* Unsubscribe from audio level updates.
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*
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* @inheritdoc
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* @returns {void}
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*/
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componentWillUnmount() {
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this._stopListeningForAudioUpdates();
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}
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/**
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* Implements React's {@link Component#render()}.
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*
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* @inheritdoc
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* @returns {ReactElement}
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*/
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render() {
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const audioMeterFill = {
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width: `${Math.floor(this.state.audioLevel * 100)}%`
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};
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return (
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<div className = 'audio-input-preview' >
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<div
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className = 'audio-input-preview-level'
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style = { audioMeterFill } />
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</div>
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);
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}
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/**
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* Starts listening for audio level updates from the library.
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*
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* @param {JitstiLocalTrack} track - The track to listen to for audio level
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* updates.
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* @private
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* @returns {void}
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*/
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_listenForAudioUpdates(track) {
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this._stopListeningForAudioUpdates();
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track && track.on(
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JitsiTrackEvents.TRACK_AUDIO_LEVEL_CHANGED,
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this._updateAudioLevel);
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}
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/**
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* Stops listening to further updates from the current track.
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*
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* @private
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* @returns {void}
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*/
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_stopListeningForAudioUpdates() {
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this.props.track && this.props.track.off(
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JitsiTrackEvents.TRACK_AUDIO_LEVEL_CHANGED,
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this._updateAudioLevel);
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}
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/**
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* Updates the internal state of the last know audio level. The level should
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* be between 0 and 1, as the level will be used as a percentage out of 1.
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*
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* @param {number} audioLevel - The new audio level for the track.
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* @private
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* @returns {void}
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*/
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_updateAudioLevel(audioLevel) {
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this.setState({
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audioLevel
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});
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}
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}
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export default AudioInputPreview;
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