jiti-meet/react/features/base/media/components/web/Video.js

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/* @flow */
import React, { Component } from 'react';
/**
* The type of the React {@code Component} props of {@link Video}.
*/
type Props = {
/**
* CSS classes to add to the video element.
*/
className: string,
/**
* The value of the id attribute of the video. Used by the torture tests to
* locate video elements.
*/
id: string,
/**
* Optional callback to invoke once the video starts playing.
*/
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onVideoPlaying?: Function,
/**
* The JitsiLocalTrack to display.
*/
videoTrack: ?Object,
/**
* Used to determine the value of the autoplay attribute of the underlying
* video element.
*/
autoPlay: boolean
};
/**
* Component that renders a video element for a passed in video track.
*
* @extends Component
*/
class Video extends Component<Props> {
_videoElement: ?Object;
/**
* Default values for {@code Video} component's properties.
*
* @static
*/
static defaultProps = {
className: '',
autoPlay: true,
id: ''
};
/**
* Initializes a new {@code Video} instance.
*
* @param {Object} props - The read-only properties with which the new
* instance is to be initialized.
*/
constructor(props: Props) {
super(props);
/**
* The internal reference to the DOM/HTML element intended for
* displaying a video.
*
* @private
* @type {HTMLVideoElement}
*/
this._videoElement = null;
// Bind event handlers so they are only bound once for every instance.
this._onVideoPlaying = this._onVideoPlaying.bind(this);
this._setVideoElement = this._setVideoElement.bind(this);
}
/**
* Invokes the library for rendering the video on initial display. Sets the
* volume level to zero to ensure no sound plays.
*
* @inheritdoc
* @returns {void}
*/
componentDidMount() {
if (this._videoElement) {
this._videoElement.volume = 0;
this._videoElement.onplaying = this._onVideoPlaying;
}
this._attachTrack(this.props.videoTrack);
}
/**
* Remove any existing associations between the current video track and the
* component's video element.
*
* @inheritdoc
* @returns {void}
*/
componentWillUnmount() {
this._detachTrack(this.props.videoTrack);
}
/**
* Updates the video display only if a new track is added. This component's
* updating is blackboxed from React to prevent re-rendering of video
* element, as the lib uses {@code track.attach(videoElement)} instead.
*
* @inheritdoc
* @returns {boolean} - False is always returned to blackbox this component
* from React.
*/
shouldComponentUpdate(nextProps: Props) {
const currentJitsiTrack = this.props.videoTrack
&& this.props.videoTrack.jitsiTrack;
const nextJitsiTrack = nextProps.videoTrack
&& nextProps.videoTrack.jitsiTrack;
if (currentJitsiTrack !== nextJitsiTrack) {
this._detachTrack(this.props.videoTrack);
this._attachTrack(nextProps.videoTrack);
}
return false;
}
/**
* Renders the video element.
*
* @override
* @returns {ReactElement}
*/
render() {
return (
<video
autoPlay = { this.props.autoPlay }
className = { this.props.className }
id = { this.props.id }
ref = { this._setVideoElement } />
);
}
/**
* Calls into the passed in track to associate the track with the
* component's video element and render video.
*
* @param {Object} videoTrack - The redux representation of the
* {@code JitsiLocalTrack}.
* @private
* @returns {void}
*/
_attachTrack(videoTrack) {
if (!videoTrack || !videoTrack.jitsiTrack) {
return;
}
videoTrack.jitsiTrack.attach(this._videoElement);
}
/**
* Removes the association to the component's video element from the passed
* in redux representation of jitsi video track to stop the track from
* rendering.
*
* @param {Object} videoTrack - The redux representation of the
* {@code JitsiLocalTrack}.
* @private
* @returns {void}
*/
_detachTrack(videoTrack) {
if (this._videoElement && videoTrack && videoTrack.jitsiTrack) {
videoTrack.jitsiTrack.detach(this._videoElement);
}
}
_onVideoPlaying: () => void;
/**
* Invokes the onvideoplaying callback if defined.
*
* @private
* @returns {void}
*/
_onVideoPlaying() {
if (this.props.onVideoPlaying) {
this.props.onVideoPlaying();
}
}
_setVideoElement: () => void;
/**
* Sets an instance variable for the component's video element so it can be
* referenced later for attaching and detaching a JitsiLocalTrack.
*
* @param {Object} element - DOM element for the component's video display.
* @private
* @returns {void}
*/
_setVideoElement(element) {
this._videoElement = element;
}
}
export default Video;