feat(local-video): convert to react (#1705)

* feat(local-video): convert to react

- Create a VideoTrack component for displaying a video element.
  This mirrors native also having a VideoTrack component.
- The VideoTrack component does not let React update it to prevent
  the video element from re-rendering, which could cause flickers
  and would not work with temasys's overriding of the video element.
- VideoTrack extends AbstractVideoTrack to mirror native
  implementation and to get the dispatch of the onplaying event.
- Remove the onclick handler on the video element. Honestly, I
  didn't get it to work, and did not try, but it is also unnecessary
  because another handler already exists on the video wrapper.

* ref(device-selection): VideoInputPreview uses VideoTrack to show video

* squash into conversion: change css selectors

* squash into conversion: mix in abstract props

* squash into conversion: change shouldComponentUpdate check

* squash: update comment about why triggerOnPlayingUpdate is used

css/_videolayout_default.scss

@@ -157,8 +157,8 @@
     -o-transform: scale(-1, 1);
 }
 
-#localVideoWrapper>video,
-#localVideoWrapper>object {
+#localVideoWrapper video,
+#localVideoWrapper object {
     border-radius: $borderRadius !important;
     cursor: hand;
     object-fit: cover;
@@ -183,8 +183,8 @@
 
 #sharedVideo,
 #etherpad,
-#localVideoWrapper>video,
-#localVideoWrapper>object,
+#localVideoWrapper video,
+#localVideoWrapper object,
 #localVideoWrapper,
 #largeVideoWrapper,
 #largeVideoWrapper>video,

modules/UI/videolayout/LocalVideo.js

@@ -1,11 +1,18 @@
 /* global $, config, interfaceConfig, APP, JitsiMeetJS */
+
+/* eslint-disable no-unused-vars */
+import React, { Component } from 'react';
+import ReactDOM from 'react-dom';
+import { Provider } from 'react-redux';
+
+import { VideoTrack } from '../../../react/features/base/media';
+/* eslint-enable no-unused-vars */
+
 const logger = require("jitsi-meet-logger").getLogger(__filename);
 
-import UIUtil from "../util/UIUtil";
 import UIEvents from "../../../service/UI/UIEvents";
 import SmallVideo from "./SmallVideo";
 
-const RTCUIUtils = JitsiMeetJS.util.RTCUIHelper;
 const TrackEvents = JitsiMeetJS.events.track;
 
 function LocalVideo(VideoLayout, emitter) {
@@ -85,31 +92,34 @@ LocalVideo.prototype.changeVideo = function (stream) {
     localVideoContainerSelector.off('click');
     localVideoContainerSelector.on('click', localVideoClick);
 
-    let localVideo = document.createElement('video');
-    localVideo.id = this.localVideoId = 'localVideo_' + stream.getId();
-
-    RTCUIUtils.setAutoPlay(localVideo, true);
-    RTCUIUtils.setVolume(localVideo, 0);
+    this.localVideoId = 'localVideo_' + stream.getId();
 
     var localVideoContainer = document.getElementById('localVideoWrapper');
-    // Put the new video always in front
-    UIUtil.prependChild(localVideoContainer, localVideo);
 
-    // Add click handler to both video and video wrapper elements in case
-    // there's no video.
-
-    // onclick has to be used with Temasys plugin
-    localVideo.onclick = localVideoClick;
+    /* jshint ignore:start */
+    ReactDOM.render(
+        <Provider store = { APP.store }>
+            <VideoTrack
+                id = { this.localVideoId }
+                videoTrack = {{ jitsiTrack: stream }} />
+        </Provider>,
+        localVideoContainer
+    );
+    /* jshint ignore:end */
 
     let isVideo = stream.videoType != "desktop";
     this._enableDisableContextMenu(isVideo);
     this.setFlipX(isVideo? APP.settings.getLocalFlipX() : false);
 
-    // Attach WebRTC stream
-    localVideo = stream.attach(localVideo);
-
     let endedHandler = () => {
-        localVideoContainer.removeChild(localVideo);
+        // Only remove if there is no video and not a transition state.
+        // Previous non-react logic created a new video element with each track
+        // removal whereas react reuses the video component so it could be the
+        // stream ended but a new one is being used.
+        if (this.videoStream.isEnded()) {
+            ReactDOM.unmountComponentAtNode(localVideoContainer);
+        }
+
         // when removing only the video element and we are on stage
         // update the stage
         if (this.isCurrentlyOnLargeVideo()) {

react/features/base/media/components/AbstractVideoTrack.js

@@ -12,6 +12,18 @@ import { Video } from './_';
  * @abstract
  */
 export default class AbstractVideoTrack extends Component {
+    /**
+     * Default values for AbstractVideoTrack component's properties.
+     *
+     * @static
+     */
+    static defaultProps = {
+        /**
+         * Dispatch an action when the video starts playing.
+         */
+        triggerOnPlayingUpdate: true
+    };
+
     /**
      * AbstractVideoTrack component's property types.
      *
@@ -19,7 +31,18 @@ export default class AbstractVideoTrack extends Component {
      */
     static propTypes = {
         dispatch: React.PropTypes.func,
+
+        /**
+         * Whether or not the store should be updated about the playing status
+         * of the video. Defaults to true. One use case for setting this prop
+         * to false is using multiple locals streams from the same video source,
+         * such as when previewing video. In those cases, the store may have no
+         * need to be updated about the existence or state of the stream.
+         */
+        triggerOnPlayingUpdate: React.PropTypes.bool,
+
         videoTrack: React.PropTypes.object,
+
         waitForVideoStarted: React.PropTypes.bool,
 
         /**
@@ -117,7 +140,9 @@ export default class AbstractVideoTrack extends Component {
     _onVideoPlaying() {
         const videoTrack = this.props.videoTrack;
 
-        if (videoTrack && !videoTrack.videoStarted) {
+        if (this.props.triggerOnPlayingUpdate
+            && videoTrack
+            && !videoTrack.videoStarted) {
             this.props.dispatch(trackVideoStarted(videoTrack.jitsiTrack));
         }
     }

react/features/base/media/components/web/VideoTrack.js

@@ -0,0 +1,202 @@
+import React from 'react';
+import { connect } from 'react-redux';
+
+import AbstractVideoTrack from '../AbstractVideoTrack';
+
+/**
+ * Component that renders a video element for a passed in video track.
+ *
+ * @extends AbstractVideoTrack
+ */
+class VideoTrack extends AbstractVideoTrack {
+    /**
+     * Default values for {@code VideoTrack} component's properties.
+     *
+     * @static
+     */
+    static defaultProps = {
+        ...AbstractVideoTrack.defaultProps,
+
+        className: '',
+
+        id: ''
+    };
+
+    /**
+     * {@code VideoTrack} component's property types.
+     *
+     * @static
+     */
+    static propTypes = {
+        ...AbstractVideoTrack.propTypes,
+
+        /**
+         * CSS classes to add to the video element.
+         */
+        className: React.PropTypes.string,
+
+        /**
+         * The value of the id attribute of the video. Used by the torture tests
+         * to locate video elements.
+         */
+        id: React.PropTypes.string
+    };
+
+    /**
+     * Initializes a new VideoTrack instance.
+     *
+     * @param {Object} props - The read-only properties with which the new
+     * instance is to be initialized.
+     */
+    constructor(props) {
+        super(props);
+
+        /**
+         * The internal reference to the DOM/HTML element intended for
+         * displaying a video. This element may be an HTML video element or a
+         * temasys video object.
+         *
+         * @private
+         * @type {HTMLVideoElement|Object}
+         */
+        this._videoElement = null;
+
+
+        // Bind event handlers so they are only bound once for every instance.
+        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() {
+        // Add these attributes directly onto the video element so temasys can
+        // use them when converting the video to an object.
+        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 track.attach(videoElement) instead. Also,
+     * re-rendering cannot be used with temasys, which replaces video elements
+     * with an object.
+     *
+     * @inheritdoc
+     * @returns {boolean} - False is always returned to blackbox this component.
+     * from React.
+     */
+    shouldComponentUpdate(nextProps) {
+        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() {
+        // The wrapping div is necessary because temasys will replace the video
+        // with an object but react will keep expecting the video element. The
+        // div gives a constant element for react to keep track of.
+        return (
+            <div>
+                <video
+                    autoPlay = { true }
+                    className = { this.props.className }
+                    id = { this.props.id }
+                    ref = { this._setVideoElement } />
+            </div>
+        );
+    }
+
+    /**
+     * 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;
+        }
+
+        const updatedVideoElement
+            = videoTrack.jitsiTrack.attach(this._videoElement);
+
+        // Sets the instance variable for the video element again as the element
+        // maybe have been replaced with a new object by temasys.
+        this._setVideoElement(updatedVideoElement);
+    }
+
+    /**
+     * 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. With temasys, the video element must still be visible for
+     * detaching to complete.
+     *
+     * @param {Object} videoTrack -  The redux representation of the
+     * {@code JitsiLocalTrack}.
+     * @private
+     * @returns {void}
+     */
+    _detachTrack(videoTrack) {
+        // Detach the video element from the track only if it has already
+        // been attached. This accounts for a special case with temasys
+        // where if detach is being called before attach, the video
+        // element is converted to Object without updating this
+        // component's reference to the video element.
+        if (this._videoElement
+            && videoTrack
+            && videoTrack.jitsiTrack
+            && videoTrack.jitsiTrack.containers.includes(this._videoElement)) {
+            videoTrack.jitsiTrack.detach(this._videoElement);
+        }
+    }
+
+    /**
+     * 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 connect()(VideoTrack);

react/features/base/media/components/web/index.js

@@ -1 +1,2 @@
 export { default as Audio } from './Audio';
+export { default as VideoTrack } from './VideoTrack';

react/features/device-selection/components/VideoInputPreview.js

@@ -1,6 +1,6 @@
 import React, { Component } from 'react';
 
-import { translate } from '../../base/i18n';
+import { VideoTrack } from '../../base/media';
 
 const VIDEO_ERROR_CLASS = 'video-preview-has-error';
 
@@ -23,86 +23,12 @@ class VideoInputPreview extends Component {
          */
         error: React.PropTypes.string,
 
-        /**
-         * Invoked to obtain translated strings.
-         */
-        t: React.PropTypes.func,
-
         /**
          * The JitsiLocalTrack to display.
          */
         track: React.PropTypes.object
     };
 
-    /**
-     * Initializes a new VideoInputPreview instance.
-     *
-     * @param {Object} props - The read-only React Component props with which
-     * the new instance is to be initialized.
-     */
-    constructor(props) {
-        super(props);
-
-        /**
-         * The internal reference to the DOM/HTML element intended for showing
-         * error messages.
-         *
-         * @private
-         * @type {HTMLDivElement}
-         */
-        this._errorElement = null;
-
-        /**
-         * The internal reference to topmost DOM/HTML element backing the React
-         * {@code Component}. Accessed directly for toggling a classname to
-         * indicate an error is present so styling can be changed to display it.
-         *
-         * @private
-         * @type {HTMLDivElement}
-         */
-        this._rootElement = null;
-
-        /**
-         * The internal reference to the DOM/HTML element intended for
-         * displaying a video. This element may be an HTML video element or a
-         * temasys video object.
-         *
-         * @private
-         * @type {HTMLVideoElement|Object}
-         */
-        this._videoElement = null;
-
-        // Bind event handlers so they are only bound once for every instance.
-        this._setErrorElement = this._setErrorElement.bind(this);
-        this._setRootElement = this._setRootElement.bind(this);
-        this._setVideoElement = this._setVideoElement.bind(this);
-    }
-
-    /**
-     * Invokes the library for rendering the video on initial display.
-     *
-     * @inheritdoc
-     * @returns {void}
-     */
-    componentDidMount() {
-        if (this.props.error) {
-            this._updateErrorView(this.props.error);
-        } else {
-            this._attachTrack(this.props.track);
-        }
-    }
-
-    /**
-     * Remove any existing associations between the current previewed track and
-     * the component's video element.
-     *
-     * @inheritdoc
-     * @returns {void}
-     */
-    componentWillUnmount() {
-        this._detachTrack(this.props.track);
-    }
-
     /**
      * Implements React's {@link Component#render()}.
      *
@@ -110,146 +36,22 @@ class VideoInputPreview extends Component {
      * @returns {ReactElement}
      */
     render() {
+        const { error } = this.props;
+        const errorClass = error ? VIDEO_ERROR_CLASS : '';
+        const className = `video-input-preview ${errorClass}`;
+
         return (
-            <div
-                className = 'video-input-preview'
-                ref = { this._setRootElement }>
-                <video
-                    autoPlay = { true }
+            <div className = { className }>
+                <VideoTrack
                     className = 'video-input-preview-display flipVideoX'
-                    ref = { this._setVideoElement } />
-                <div
-                    className = 'video-input-preview-error'
-                    ref = { this._setErrorElement } />
+                    triggerOnPlayingUpdate = { false }
+                    videoTrack = {{ jitsiTrack: this.props.track }} />
+                <div className = 'video-input-preview-error'>
+                    { error || '' }
+                </div>
             </div>
         );
     }
-
-    /**
-     * Only update when the deviceId has changed. This component is somewhat
-     * black-boxed from React's rendering so lib-jitsi-meet can instead handle
-     * updating of the video preview, which takes browser differences into
-     * consideration. For example, temasys's video object must be visible to
-     * update the displayed track, but React's re-rendering could potentially
-     * remove the video object from the page.
-     *
-     * @inheritdoc
-     * @returns {void}
-     */
-    shouldComponentUpdate(nextProps) {
-        const hasNewTrack = nextProps.track !== this.props.track;
-
-        if (hasNewTrack || nextProps.error) {
-            this._detachTrack(this.props.track);
-            this._updateErrorView(nextProps.error);
-        }
-
-        // Never attempt to show the new track if there is an error present.
-        if (hasNewTrack && !nextProps.error) {
-            this._attachTrack(nextProps.track);
-        }
-
-        return false;
-    }
-
-    /**
-     * Calls into the passed in track to associate the track with the
-     * component's video element and render video. Also sets the instance
-     * variable for the video element as the element the track attached to,
-     * which could be an Object if on a temasys supported browser.
-     *
-     * @param {JitsiLocalTrack} track - The library's track model which will be
-     * displayed.
-     * @private
-     * @returns {void}
-     */
-    _attachTrack(track) {
-        if (!track) {
-            return;
-        }
-
-        const updatedVideoElement = track.attach(this._videoElement);
-
-        this._setVideoElement(updatedVideoElement);
-    }
-
-    /**
-     * Removes the association to the component's video element from the passed
-     * in JitsiLocalTrack to stop the track from rendering. With temasys, the
-     * video element must still be visible for detaching to complete.
-     *
-     * @param {JitsiLocalTrack} track - The library's track model which needs
-     * to stop previewing in the video element.
-     * @private
-     * @returns {void}
-     */
-    _detachTrack(track) {
-        // Detach the video element from the track only if it has already
-        // been attached. This accounts for a special case with temasys
-        // where if detach is being called before attach, the video
-        // element is converted to Object without updating this
-        // component's reference to the video element.
-        if (this._videoElement
-            && track
-            && track.containers.includes(this._videoElement)) {
-            track.detach(this._videoElement);
-        }
-    }
-
-    /**
-     * Sets an instance variable for the component's element intended for
-     * displaying error messages. The element will be accessed directly to
-     * display an error message.
-     *
-     * @param {Object} element - DOM element intended for displaying errors.
-     * @private
-     * @returns {void}
-     */
-    _setErrorElement(element) {
-        this._errorElement = element;
-    }
-
-    /**
-     * Sets the component's root element.
-     *
-     * @param {Object} element - The highest DOM element in the component.
-     * @private
-     * @returns {void}
-     */
-    _setRootElement(element) {
-        this._rootElement = element;
-    }
-
-    /**
-     * 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;
-    }
-
-    /**
-     * Adds or removes a class to the component's parent node to indicate an
-     * error has occurred. Also sets the error text.
-     *
-     * @param {string} error - The error message to display. If falsy, error
-     * message display will be hidden.
-     * @private
-     * @returns {void}
-     */
-    _updateErrorView(error) {
-        if (error) {
-            this._rootElement.classList.add(VIDEO_ERROR_CLASS);
-        } else {
-            this._rootElement.classList.remove(VIDEO_ERROR_CLASS);
-        }
-
-        this._errorElement.innerText = error || '';
-    }
 }
 
-export default translate(VideoInputPreview);
+export default VideoInputPreview;