329 lines
12 KiB
JavaScript
329 lines
12 KiB
JavaScript
/*
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* Copyright @ 2015 Atlassian Pty Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import UIEvents from '../service/UI/UIEvents';
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import VideoLayout from './UI/videolayout/VideoLayout';
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import FilmStrip from './UI/videolayout/FilmStrip';
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/**
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* The (name of the) command which transports the state (represented by
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* {State} for the local state at the time of this writing) of a {FollowMe}
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* (instance) between participants.
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*/
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const _COMMAND = "follow-me";
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/**
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* Represents the set of {FollowMe}-related states (properties and their
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* respective values) which are to be followed by a participant. {FollowMe}
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* will send {_COMMAND} whenever a property of {State} changes (if the local
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* participant is in her right to issue such a command, of course).
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*/
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class State {
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/**
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* Initializes a new {State} instance.
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*
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* @param propertyChangeCallback {Function} which is to be called when a
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* property of the new instance has its value changed from an old value
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* into a (different) new value. The function is supplied with the name of
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* the property, the old value of the property before the change, and the
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* new value of the property after the change.
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*/
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constructor (propertyChangeCallback) {
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this._propertyChangeCallback = propertyChangeCallback;
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}
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get filmStripVisible () { return this._filmStripVisible; }
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set filmStripVisible (b) {
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var oldValue = this._filmStripVisible;
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if (oldValue !== b) {
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this._filmStripVisible = b;
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this._firePropertyChange('filmStripVisible', oldValue, b);
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}
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}
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get nextOnStage() { return this._nextOnStage; }
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set nextOnStage(id) {
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var oldValue = this._nextOnStage;
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if (oldValue !== id) {
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this._nextOnStage = id;
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this._firePropertyChange('nextOnStage', oldValue, id);
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}
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}
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get sharedDocumentVisible () { return this._sharedDocumentVisible; }
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set sharedDocumentVisible (b) {
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var oldValue = this._sharedDocumentVisible;
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if (oldValue !== b) {
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this._sharedDocumentVisible = b;
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this._firePropertyChange('sharedDocumentVisible', oldValue, b);
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}
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}
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/**
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* Invokes {_propertyChangeCallback} to notify it that {property} had its
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* value changed from {oldValue} to {newValue}.
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*
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* @param property the name of the property which had its value changed
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* from {oldValue} to {newValue}
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* @param oldValue the value of {property} before the change
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* @param newValue the value of {property} after the change
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*/
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_firePropertyChange (property, oldValue, newValue) {
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var propertyChangeCallback = this._propertyChangeCallback;
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if (propertyChangeCallback)
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propertyChangeCallback(property, oldValue, newValue);
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}
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}
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/**
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* Represents the "Follow Me" feature which enables a moderator to
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* (partially) control the user experience/interface (e.g. film strip
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* visibility) of (other) non-moderator particiapnts.
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*
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* @author Lyubomir Marinov
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*/
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class FollowMe {
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/**
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* Initializes a new {FollowMe} instance.
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*
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* @param conference the {conference} which is to transport
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* {FollowMe}-related information between participants
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* @param UI the {UI} which is the source (model/state) to be sent to
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* remote participants if the local participant is the moderator or the
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* destination (model/state) to receive from the remote moderator if the
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* local participant is not the moderator
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*/
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constructor (conference, UI) {
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this._conference = conference;
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this._UI = UI;
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// The states of the local participant which are to be followed (by the
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// remote participants when the local participant is in her right to
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// issue such commands).
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this._local = new State(this._localPropertyChange.bind(this));
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// Listen to "Follow Me" commands. I'm not sure whether a moderator can
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// (in lib-jitsi-meet and/or Meet) become a non-moderator. If that's
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// possible, then it may be easiest to always listen to commands. The
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// listener will validate received commands before acting on them.
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conference.commands.addCommandListener(
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_COMMAND,
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this._onFollowMeCommand.bind(this));
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}
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/**
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* Adds listeners for the UI states of the local participant which are
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* to be followed (by the remote participants). A non-moderator (very
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* likely) can become a moderator so it may be easiest to always track
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* the states of interest.
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* @private
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*/
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_addFollowMeListeners () {
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this.filmStripEventHandler = this._filmStripToggled.bind(this);
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this._UI.addListener(UIEvents.TOGGLED_FILM_STRIP,
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this.filmStripEventHandler);
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var self = this;
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this.pinnedEndpointEventHandler = function (smallVideo, isPinned) {
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self._nextOnStage(smallVideo, isPinned);
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};
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this._UI.addListener(UIEvents.PINNED_ENDPOINT,
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this.pinnedEndpointEventHandler);
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this.sharedDocEventHandler = this._sharedDocumentToggled.bind(this);
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this._UI.addListener( UIEvents.TOGGLED_SHARED_DOCUMENT,
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this.sharedDocEventHandler);
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}
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/**
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* Removes all follow me listeners.
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* @private
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*/
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_removeFollowMeListeners () {
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this._UI.removeListener(UIEvents.TOGGLED_FILM_STRIP,
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this.filmStripEventHandler);
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this._UI.removeListener(UIEvents.TOGGLED_SHARED_DOCUMENT,
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this.sharedDocEventHandler);
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this._UI.removeListener(UIEvents.PINNED_ENDPOINT,
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this.pinnedEndpointEventHandler);
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}
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/**
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* Enables or disabled the follow me functionality
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*
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* @param enable {true} to enable the follow me functionality, {false} -
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* to disable it
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*/
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enableFollowMe (enable) {
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this.isEnabled = enable;
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if (this.isEnabled)
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this._addFollowMeListeners();
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else
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this._removeFollowMeListeners();
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}
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/**
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* Notifies this instance that the (visibility of the) film strip was
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* toggled (in the user interface of the local participant).
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*
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* @param filmStripVisible {Boolean} {true} if the film strip was shown (as
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* a result of the toggle) or {false} if the film strip was hidden
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*/
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_filmStripToggled (filmStripVisible) {
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this._local.filmStripVisible = filmStripVisible;
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}
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/**
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* Notifies this instance that the (visibility of the) shared document was
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* toggled (in the user interface of the local participant).
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*
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* @param sharedDocumentVisible {Boolean} {true} if the shared document was
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* shown (as a result of the toggle) or {false} if it was hidden
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*/
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_sharedDocumentToggled (sharedDocumentVisible) {
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this._local.sharedDocumentVisible = sharedDocumentVisible;
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}
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/**
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* Changes the nextOnPage property value.
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*
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* @param smallVideo the {SmallVideo} that was pinned or unpinned
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* @param isPinned indicates if the given {SmallVideo} was pinned or
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* unpinned
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* @private
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*/
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_nextOnStage (smallVideo, isPinned) {
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if (!this._conference.isModerator)
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return;
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var nextOnStage = null;
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if(isPinned)
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nextOnStage = smallVideo.getId();
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this._local.nextOnStage = nextOnStage;
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}
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/**
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* Sends the follow-me command, when a local property change occurs.
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*
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* @param property the property name
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* @param oldValue the old value
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* @param newValue the new value
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* @private
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*/
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_localPropertyChange (property, oldValue, newValue) {
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// Only a moderator is allowed to send commands.
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var conference = this._conference;
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if (!conference.isModerator)
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return;
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var commands = conference.commands;
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// XXX The "Follow Me" command represents a snapshot of all states
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// which are to be followed so don't forget to removeCommand before
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// sendCommand!
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commands.removeCommand(_COMMAND);
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var self = this;
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commands.sendCommandOnce(
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_COMMAND,
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{
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attributes: {
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filmStripVisible: self._local.filmStripVisible,
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nextOnStage: self._local.nextOnStage,
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sharedDocumentVisible: self._local.sharedDocumentVisible
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}
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});
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}
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/**
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* Notifies this instance about a &qout;Follow Me&qout; command (delivered
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* by the Command(s) API of {this._conference}).
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*
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* @param attributes the attributes {Object} carried by the command
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* @param id the identifier of the participant who issued the command. A
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* notable idiosyncrasy of the Command(s) API to be mindful of here is that
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* the command may be issued by the local participant.
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*/
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_onFollowMeCommand ({ attributes }, id) {
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// We require to know who issued the command because (1) only a
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// moderator is allowed to send commands and (2) a command MUST be
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// issued by a defined commander.
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if (typeof id === 'undefined')
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return;
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// The Command(s) API will send us our own commands and we don't want
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// to act upon them.
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if (this._conference.isLocalId(id))
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return;
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// TODO Don't obey commands issued by non-moderators.
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// Applies the received/remote command to the user experience/interface
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// of the local participant.
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this._onFilmStripVisible(attributes.filmStripVisible);
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this._onNextOnStage(attributes.nextOnStage);
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this._onSharedDocumentVisible(attributes.sharedDocumentVisible);
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}
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_onFilmStripVisible(filmStripVisible) {
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if (typeof filmStripVisible !== 'undefined') {
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// XXX The Command(s) API doesn't preserve the types (of
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// attributes, at least) at the time of this writing so take into
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// account that what originated as a Boolean may be a String on
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// receipt.
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filmStripVisible = (filmStripVisible == 'true');
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// FIXME The UI (module) very likely doesn't (want to) expose its
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// eventEmitter as a public field. I'm not sure at the time of this
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// writing whether calling UI.toggleFilmStrip() is acceptable (from
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// a design standpoint) either.
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if (filmStripVisible !== FilmStrip.isFilmStripVisible())
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this._UI.eventEmitter.emit(
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UIEvents.TOGGLE_FILM_STRIP,
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filmStripVisible);
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}
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}
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_onNextOnStage(id) {
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var clickId = null;
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if(typeof id !== 'undefined' && !VideoLayout.isPinned(id))
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clickId = id;
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else if (typeof id == 'undefined')
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clickId = VideoLayout.getPinnedId();
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if (clickId !== null)
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VideoLayout.handleVideoThumbClicked(clickId);
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}
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_onSharedDocumentVisible(sharedDocumentVisible) {
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if (typeof sharedDocumentVisible !== 'undefined') {
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// XXX The Command(s) API doesn't preserve the types (of
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// attributes, at least) at the time of this writing so take into
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// account that what originated as a Boolean may be a String on
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// receipt.
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sharedDocumentVisible = (sharedDocumentVisible == 'true');
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if (sharedDocumentVisible
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!== this._UI.getSharedDocumentManager().isVisible())
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this._UI.getSharedDocumentManager().toggleEtherpad();
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}
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}
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}
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export default FollowMe;
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