feat(VideoLayout): add remote connection problems UI

Grey filter will be applied to the remote video/avatar displayed on
"large" and a message indicating remote connectivity issues will be
shown on top of that.

css/_videolayout_default.scss

     filter: grayscale(.5) opacity(0.8);
 }
 
+.remoteVideoProblemFilter {
+    -webkit-filter: grayscale(100%);
+    filter: grayscale(100%);
+}
+
 .videoProblemFilter {
     -webkit-filter: blur(10px) grayscale(.5) opacity(0.8);
     filter: blur(10px) grayscale(.5) opacity(0.8);
     filter: grayscale(100%);
 }
 
+#remoteConnectionMessage {
+    display: none;
+    position: absolute;
+    width: auto;
+    z-index: 1011;
+    font-weight: 600;
+    font-size: 14px;
+    text-align: center;
+    color: #FFF;
+    opacity: .80;
+    text-shadow:    0px 0px 1px rgba(0,0,0,0.3),
+                    0px 1px 1px rgba(0,0,0,0.3),
+                    1px 0px 1px rgba(0,0,0,0.3),
+                    0px 0px 1px rgba(0,0,0,0.3);
+
+    background: rgba(0,0,0,.5);
+    border-radius: 5px;
+    padding: 5px;
+    padding-left: 10px;
+    padding-right: 10px;
+}
+
 #videoConnectionMessage {
     display: none;
     position: absolute;

index.html

                     <img id="dominantSpeakerAvatar" src=""/>
                     <canvas id="dominantSpeakerAudioLevel"></canvas>
                 </div>
+                <span id="remoteConnectionMessage"></span>
                 <div id="largeVideoWrapper">
                     <video id="largeVideo" muted="true" autoplay></video>
                 </div>

lang/main.json

         "ATTACHED": "Attached",
         "FETCH_SESSION_ID": "Obtaining session-id...",
         "GOT_SESSION_ID": "Obtaining session-id... Done",
-        "GET_SESSION_ID_ERROR": "Get session-id error: "
+        "GET_SESSION_ID_ERROR": "Get session-id error: ",
+        "USER_CONNECTION_INTERRUPTED": "__displayName__ is having connectivity issues..."
     },
     "recording":
     {

modules/UI/videolayout/LargeVideoManager.js

 
         // Include hide()/fadeOut only if we're switching between users
         let preUpdate;
-        if (this.newStreamData.id != this.id) {
+        let isUserSwitch = this.newStreamData.id != this.id;
+        if (isUserSwitch) {
             preUpdate = container.hide();
         } else {
             preUpdate = Promise.resolve();
             // If we the continer is VIDEO_CONTAINER_TYPE, we need to check
             // its stream whether exist and is muted to set isVideoMuted
             // in rest of the cases it is false
-            let isVideoMuted = false;
+            let showAvatar = false;
             if (videoType == VIDEO_CONTAINER_TYPE)
-                isVideoMuted = stream ? stream.isMuted() : true;
-
-            // show the avatar on large if needed
-            container.showAvatar(isVideoMuted);
+                showAvatar = stream ? stream.isMuted() : true;
+
+            // If the user's connection is disrupted then the avatar will be
+            // displayed in case we have no video image cached. That is if
+            // there was a user switch(image is lost on stream detach) or if
+            // the video was not rendered, before the connection has failed.
+            let isHavingConnectivityIssues
+                = APP.conference.isParticipantConnectionActive(id) === false;
+            if (isHavingConnectivityIssues
+                    && (isUserSwitch | !container.wasVideoRendered)) {
+                showAvatar = true;
+            }
 
             let promise;
 
             // do not show stream if video is muted
             // but we still should show watermark
-            if (isVideoMuted) {
+            if (showAvatar) {
                 this.showWatermark(true);
-                // If the avatar is to be displayed the video should be hidden
+                // If the intention of this switch is to show the avatar
+                // we need to make sure that the video is hidden
                 promise = container.hide();
             } else {
                 promise = container.show();
             }
 
+            // show the avatar on large if needed
+            container.showAvatar(showAvatar);
+
+            // Make sure no notification about remote failure is shown as
+            // it's UI conflicts with the one for local connection interrupted.
+            if (APP.conference.isConnectionInterrupted()) {
+                this.updateParticipantConnStatusIndication(id, true);
+            } else {
+                this.updateParticipantConnStatusIndication(
+                    id, !isHavingConnectivityIssues);
+            }
+
             // resolve updateLargeVideo promise after everything is done
             promise.then(resolve);
 
         });
     }
 
+    /**
+     * Shows/hides notification about participant's connectivity issues to be
+     * shown on the large video area.
+     *
+     * @param {string} id the id of remote participant(MUC nickname)
+     * @param {boolean} isConnected true if the connection is active or false
+     * when the user is having connectivity issues.
+     *
+     * @private
+     */
+    updateParticipantConnStatusIndication (id, isConnected) {
+
+        // Apply grey filter on the large video
+        this.videoContainer.showRemoteConnectionProblemIndicator(!isConnected);
+
+        if (isConnected) {
+            // Hide the message
+            this.showRemoteConnectionMessage(false);
+        } else {
+            // Get user's display name
+            let displayName
+                = APP.conference.getParticipantDisplayName(id);
+            this._setRemoteConnectionMessage(
+                "connection.USER_CONNECTION_INTERRUPTED",
+                { displayName: displayName });
+
+            // Show it now only if the VideoContainer is on top
+            this.showRemoteConnectionMessage(
+                this.state === VIDEO_CONTAINER_TYPE);
+        }
+    }
+
     /**
      * Update large video.
      * Switches to large video even if previously other container was visible.
 
         if (show) {
             $('#videoConnectionMessage').css({display: "block"});
+            // Avatar message conflicts with 'videoConnectionMessage',
+            // so it must be hidden
+            this.showRemoteConnectionMessage(false);
         } else {
             $('#videoConnectionMessage').css({display: "none"});
         }
     }
 
+    /**
+     * Shows hides the "avatar" message which is to be displayed either in
+     * the middle of the screen or below the avatar image.
+     *
+     * @param {null|boolean} show (optional) <tt>true</tt> to show the avatar
+     * message or <tt>false</tt> to hide it. If not provided then the connection
+     * status of the user currently on the large video will be obtained form
+     * "APP.conference" and the message will be displayed if the user's
+     * connection is interrupted.
+     */
+    showRemoteConnectionMessage (show) {
+        if (typeof show !== 'boolean') {
+            show = APP.conference.isParticipantConnectionActive(this.id);
+        }
+
+        if (show) {
+            $('#remoteConnectionMessage').css({display: "block"});
+            // 'videoConnectionMessage' message conflicts with 'avatarMessage',
+            // so it must be hidden
+            this.showVideoConnectionMessage(false);
+        } else {
+            $('#remoteConnectionMessage').hide();
+        }
+    }
+
+    /**
+     * Updates the text which describes that the remote user is having
+     * connectivity issues.
+     *
+     * @param {string} msgKey the translation key which will be used to get
+     * the message text.
+     * @param {object} msgOptions translation options object.
+     *
+     * @private
+     */
+    _setRemoteConnectionMessage (msgKey, msgOptions) {
+        if (msgKey) {
+            let text = APP.translation.translateString(msgKey, msgOptions);
+            $('#remoteConnectionMessage')
+                .attr("data-i18n", msgKey).text(text);
+        }
+
+        this.videoContainer.positionRemoteConnectionMessage();
+    }
+
     /**
      * Updated the text which is to be shown on the top of large video.
      *
         if (this.state === VIDEO_CONTAINER_TYPE) {
             this.showWatermark(false);
             this.showVideoConnectionMessage(false);
+            this.showRemoteConnectionMessage(false);
         }
         oldContainer.hide();
 
                 // the container would be taking care of it by itself, but that
                 // is a bigger refactoring
                 this.showWatermark(true);
+                // "avatar" and "video connection" can not be displayed both
+                // at the same time, but the latter is of higher priority and it
+                // will hide the avatar one if will be displayed.
+                this.showRemoteConnectionMessage(/* fet the current state */);
                 this.showVideoConnectionMessage(/* fetch the current state */);
             }
         });

modules/UI/videolayout/VideoContainer.js

 
         this.isVisible = false;
 
+        /**
+         * Flag indicates whether or not the avatar is currently displayed.
+         * @type {boolean}
+         */
+        this.avatarDisplayed = false;
         this.$avatar = $('#dominantSpeaker');
 
+        /**
+         * A jQuery selector of the remote connection message.
+         * @type {jQuery|HTMLElement}
+         */
+        this.$remoteConnectionMessage = $('#remoteConnectionMessage');
+
         /**
          * Indicates whether or not the video stream attached to the video
          * element has started(which means that there is any image rendered
         }
     }
 
+    /**
+     * Update position of the remote connection message which describes that
+     * the remote user is having connectivity issues.
+     */
+    positionRemoteConnectionMessage () {
+
+        if (this.avatarDisplayed) {
+            let $avatarImage = $("#dominantSpeakerAvatar");
+            this.$remoteConnectionMessage.css(
+                'top',
+                $avatarImage.offset().top + $avatarImage.height() + 10);
+        } else {
+            let height = this.$remoteConnectionMessage.height();
+            let parentHeight = this.$remoteConnectionMessage.parent().height();
+            this.$remoteConnectionMessage.css(
+                'top', (parentHeight/2) - (height/2));
+        }
+
+        let width = this.$remoteConnectionMessage.width();
+        let parentWidth = this.$remoteConnectionMessage.parent().width();
+        this.$remoteConnectionMessage.css(
+            'left', ((parentWidth/2) - (width/2)));
+    }
+
     resize (containerWidth, containerHeight, animate = false) {
         let [width, height]
             = this.getVideoSize(containerWidth, containerHeight);
 
         this.$avatar.css('top', top);
 
+        this.positionRemoteConnectionMessage();
+
         this.$wrapper.animate({
             width: width,
             height: height,
             (show) ? interfaceConfig.DEFAULT_BACKGROUND : "#000");
 
         this.$avatar.css("visibility", show ? "visible" : "hidden");
+        this.avatarDisplayed = show;
 
         this.emitter.emit(UIEvents.LARGE_VIDEO_AVATAR_DISPLAYED, show);
     }
 
+    /**
+     * Indicates that the remote user who is currently displayed by this video
+     * container is having connectivity issues.
+     *
+     * @param {boolean} show <tt>true</tt> to show or <tt>false</tt> to hide
+     * the indication.
+     */
+    showRemoteConnectionProblemIndicator (show) {
+        this.$video.toggleClass("remoteVideoProblemFilter", show);
+        this.$avatar.toggleClass("remoteVideoProblemFilter", show);
+    }
+
     // We are doing fadeOut/fadeIn animations on parent div which wraps
     // largeVideo, because when Temasys plugin is in use it replaces
     // <video> elements with plugin <object> tag. In Safari jQuery is

modules/UI/videolayout/VideoLayout.js

      * the user is having connectivity issues.
      */
     onParticipantConnectionStatusChanged (id, isActive) {
+        // Show/hide warning on the large video
+        if (this.isCurrentlyOnLarge(id)) {
+            if (largeVideo) {
+                largeVideo.updateParticipantConnStatusIndication(id, isActive);
+            }
+        }
         // Show/hide warning on the thumbnail
         let remoteVideo = remoteVideos[id];
         if (remoteVideo) {