#50 - Update the view when <video> elements are added or removed from the DOM (or when it's style or any parent style changes)

src/js/OT.coffee

@@ -11,6 +11,7 @@
 #     TB.upgradeSystemRequirements()
 
 window.OT =
+  timeStreamCreated: {}
   checkSystemRequirements: ->
     return 1
   initPublisher: (one, two) ->

src/js/OTHelpers.coffee

@@ -78,17 +78,31 @@ OTPublisherError = (error) ->
 
 TBUpdateObjects = ()->
   console.log("JS: Objects being updated in TBUpdateObjects")
-  objects = document.getElementsByClassName('OT_root')
-
-  ratios = TBGetScreenRatios()
+  updateObject = (e, time) ->
+    setTimeout(() ->
+      ratios = TBGetScreenRatios()
+      streamId = e.dataset.streamid
+      position = getPosition(e)
+      zIndex = TBGetZIndex(e)
+      if !e.TBPosition || position.top != e.TBPosition.top || position.left != e.TBPosition.left || position.width != e.TBPosition.width || position.height != e.TBPosition.height || zIndex != e.TBZIndex
+        console.log("JS: Object updated with sessionId " + streamId + " updated");
+        e.TBPosition = position;
+        e.TBZIndex = zIndex;
+        Cordova.exec(TBSuccess, TBError, OTPlugin, "updateView", [streamId, position.top, position.left, position.width, position.height, zIndex, ratios.widthRatio, ratios.heightRatio]);
+    , time)
+    return
 
+  objects = document.getElementsByClassName('OT_root')
   for e in objects
-    console.log("JS: Object updated")
     streamId = e.dataset.streamid
-    console.log("JS sessionId: " + streamId )
-    position = getPosition(e)
-    Cordova.exec(TBSuccess, TBError, OTPlugin, "updateView", [streamId, position.top, position.left, position.width, position.height, TBGetZIndex(e), ratios.widthRatio, ratios.heightRatio] )
+    time = 0
+    if typeof window.angular != "undefined" || typeof window.Ionic != "undefined"
+      if OT.timeStreamCreated[streamId]
+        time = performance.now() - OT.timeStreamCreated[streamId]
+        delete OT.timeStreamCreated[streamId]
+    updateObject(e, time)
   return
+
 TBGenerateDomHelper = ->
   domId = "PubSub" + Date.now()
   div = document.createElement('div')
@@ -129,5 +143,79 @@ OTReplacePublisher = ()->
         break
     return
 
+OTObserveVideoContainer = (() ->
+  videoContainerObserver = new MutationObserver((mutations) ->
+    for mutation in mutations
+      if mutation.attributeName == 'style' || mutation.attributeName == 'class'
+        TBUpdateObjects();
+  )
+  return (videoContainer) ->
+    # If already observed, just update, else observe.
+    if(videoContainer._OTObserved)
+      TBUpdateObjects(videoContainer)
+    else
+      videoContainer._OTObserved = true;
+      videoContainerObserver.observe(videoContainer, {
+        # Set to true if additions and removals of the target node's child elements (including text nodes) are to be observed.
+        childList: false
+        # Set to true if mutations to target's attributes are to be observed.
+        attributes: true
+        # Set to true if mutations to target's data are to be observed.
+        characterData: false
+        # Set to true if mutations to not just target, but also target's descendants are to be observed.
+        subtree: true
+        # Set to true if attributes is set to true and target's attribute value before the mutation needs to be recorded.
+        attributeOldValue: false
+        # Set to true if characterData is set to true and target's data before the mutation needs to be recorded.
+        characterDataOldValue: false
+        # Set to an array of attribute local names (without namespace) if not all attribute mutations need to be observed.
+        attributeFilter: ['style', 'class']
+      })
+)()
+MutationObserver = MutationObserver || WebKitMutationObserver
+OTDomObserver = new MutationObserver((mutations) ->
+  getVideoContainer = (node) ->
+    if typeof node.querySelector != 'function'
+      return
+
+    videoElement = node.querySelector('video')
+    if videoElement
+      while (videoElement = videoElement.parentNode) && !videoElement.hasAttribute('data-streamid')
+        continue
+      return videoElement
+    return false
+
+  checkNewNode = (node) ->
+    videoContainer = getVideoContainer(node)
+    if videoContainer
+      OTObserveVideoContainer(videoContainer)
+
+  checkRemovedNode = (node) ->
+    # Stand-in, if we want to trigger things in the future(like emitting events).
+    return
+
+  for mutation in mutations
+    # Check if its attributes that have changed(including children).
+    if mutation.type == 'attributes'
+      videoContainer = getVideoContainer(mutation.target)
+      if videoContainer
+        TBUpdateObjects()
+      continue
+
+    # Check if there has been addition or deletion of nodes.
+    if mutation.type != 'childList'
+      continue
+
+    # Check added nodes.
+    for node in mutation.addedNodes
+      checkNewNode(node)
+
+    # Check removed nodes.
+    for node in mutation.removedNodes
+      checkRemovedNode(node)
+
+  return
+)
+
 pdebug = (msg, data) ->
   console.log "JS Lib: #{msg} - ", data

src/js/OTPublisher.coffee

@@ -18,7 +18,7 @@ class TBPublisher
   constructor: (one, two) ->
     @sanitizeInputs(one, two)
     pdebug "creating publisher", {}
-    position = getPosition(@pubElement)
+    @position = getPosition(@pubElement)
     name=""
     publishAudio="true"
     publishVideo="true"
@@ -33,8 +33,8 @@ class TBPublisher
     resolution = "640X480"
     insertMode = "replace"
     if @properties?
-      width = @properties.width ? position.width
-      height = @properties.height ? position.height
+      width = @properties.width ? @position.width
+      height = @properties.height ? @position.height
       name = @properties.name ? ""
       cameraName = @properties.cameraName ? "front"
       audioFallbackEnabled = @properties.audioFallbackEnabled ? audioFallbackEnabled
@@ -58,15 +58,22 @@ class TBPublisher
       width = DefaultWidth
       height = DefaultHeight
     replaceWithVideoStream(@pubElement, PublisherStreamId, {width:width, height:height, insertMode:insertMode})
-    position = getPosition(@pubElement)
-    TBUpdateObjects()
+    # If element is not yet in body, set it to 0 and then the observer will set it properly.
+    if !document.body.contains(@pubElement)
+      width = 0;
+      height = 0;
+    @position = getPosition(@pubElement)
     OT.getHelper().eventing(@)
-    Cordova.exec(TBSuccess, TBError, OTPlugin, "initPublisher", [name, position.top, position.left, width, height, zIndex, publishAudio, publishVideo, cameraName, ratios.widthRatio, ratios.heightRatio, audioFallbackEnabled, audioBitrate, audioSource, videoSource, frameRate, resolution] )
+    Cordova.exec(TBSuccess, TBError, OTPlugin, "initPublisher", [name, @position.top, @position.left, width, height, zIndex, publishAudio, publishVideo, cameraName, ratios.widthRatio, ratios.heightRatio, audioFallbackEnabled, audioBitrate, audioSource, videoSource, frameRate, resolution] )
     Cordova.exec(@eventReceived, TBSuccess, OTPlugin, "addEvent", ["publisherEvents"] )
   setSession: (session) =>
     @session = session
   eventReceived: (response) =>
-    @[response.eventType](response.data)
+    pdebug "publisher event received", response
+    if typeof @[response.eventType] == "function"
+      @[response.eventType](response.data)
+    else
+      pdebug "No method found for EventType: '" + response.eventType + "'";
   streamCreated: (event) =>
     @stream = new TBStream( event.stream, @session.sessionConnected )
     streamEvent = new TBEvent("streamCreated")

src/js/OTSession.coffee

@@ -119,7 +119,6 @@ class TBSession
     element = @publisher.pubElement
     if(element)
       @resetElement(element)
-      TBUpdateObjects()
     return Cordova.exec(TBSuccess, TBError, OTPlugin, "unpublish", [] )
   unsubscribe: (subscriber) ->
     console.log("JS: Unsubscribe")
@@ -130,7 +129,6 @@ class TBSession
     if(element)
       @resetElement(element)
       delete( streamElements[ elementId ] )
-      TBUpdateObjects()
     return Cordova.exec(TBSuccess, TBError, OTPlugin, "unsubscribe", [subscriber.streamId] )
 
   constructor: (@apiKey, @sessionId) ->
@@ -166,7 +164,10 @@ class TBSession
   # event listeners
   # todo - other events: connectionCreated, connectionDestroyed, signal?, streamPropertyChanged, signal:type?
   eventReceived: (response) =>
-    @[response.eventType](response.data)
+    if typeof @[response.eventType] == "function"
+      @[response.eventType](response.data)
+    else
+      pdebug "No method found for EventType: '" + response.eventType + "'";
   connectionCreated: (event) =>
     connection = new TBConnection( event.connection )
     connectionEvent = new TBEvent("connectionCreated")
@@ -183,12 +184,30 @@ class TBSession
     delete( @connections[ connection.connectionId] )
     return @
   sessionConnected: (event) =>
+    pdebug "sessionConnectedHandler", event
+    OTDomObserver.observe(document, {
+      # Set to true if additions and removals of the target node's child elements (including text nodes) are to be observed.
+      childList: true
+      # Set to true if mutations to target's attributes are to be observed.
+      attributes: true
+      # Set to true if mutations to target's data are to be observed.
+      characterData: false
+      # Set to true if mutations to not just target, but also target's descendants are to be observed.
+      subtree: true
+      # Set to true if attributes is set to true and target's attribute value before the mutation needs to be recorded.
+      attributeOldValue: false
+      # Set to true if characterData is set to true and target's data before the mutation needs to be recorded.
+      characterDataOldValue: false
+      # Set to an array of attribute local names (without namespace) if not all attribute mutations need to be observed.
+      attributeFilter: ['style', 'class']
+    })
     @dispatchEvent(new TBEvent("sessionConnected"))
     @connection = new TBConnection( event.connection )
     @connections[event.connection.connectionId] = @connection
     event = null
     return @
   sessionDisconnected: (event) =>
+    OTDomObserver.disconnect()
     @alreadyPublishing = false
     sessionDisconnectedEvent = new TBEvent("sessionDisconnected")
     sessionDisconnectedEvent.reason = event.reason
@@ -206,6 +225,7 @@ class TBSession
   streamCreated: (event) =>
     stream = new TBStream( event.stream, @connections[event.stream.connectionId] )
     @streams[ stream.streamId ] = stream
+    OT.timeStreamCreated[stream.streamId] = performance.now()
     streamEvent = new TBEvent("streamCreated")
     streamEvent.stream = stream
     #streamEvent = new TBEvent( {stream: stream } )
@@ -223,7 +243,6 @@ class TBSession
       if(element)
         @resetElement(element)
         delete( streamElements[ stream.streamId ] )
-        TBUpdateObjects()
       delete( @streams[ stream.streamId ] )
     return @
   streamPropertyChanged: (event) ->

src/js/OTSubscriber.coffee

@@ -74,14 +74,21 @@ class TBSubscriber
       width = DefaultWidth
       height = DefaultHeight
     obj = replaceWithVideoStream(@element, stream.streamId, {width:width, height:height, insertMode:insertMode})
+    # If element is not yet in body, set it to 0 and then the observer will set it properly.
+    if !document.body.contains(@element)
+      width = 0;
+      height = 0;
     position = getPosition(@element)
     ratios = TBGetScreenRatios()
     OT.getHelper().eventing(@)
     Cordova.exec(TBSuccess, TBError, OTPlugin, "subscribe", [stream.streamId, position.top, position.left, width, height, zIndex, subscribeToAudio, subscribeToVideo, ratios.widthRatio, ratios.heightRatio] )
     Cordova.exec(@eventReceived, TBSuccess, OTPlugin, "addEvent", ["subscriberEvents"] )
 
   eventReceived: (response) =>
-    @[response.eventType](response.data)
+    if typeof @[response.eventType] == "function"
+      @[response.eventType](response.data)
+    else
+      pdebug "No method found for EventType: '" + response.eventType + "'";
   connected: (event) =>
     streamEvent = new TBEvent("connected")
     streamEvent.stream = event.streamId