Encapsulated some duplicate code.

labs/meteor-client/client/globals.coffee

@@ -76,9 +76,8 @@ Handlebars.registerHelper "getMeetingName", ->
   window.getMeetingName()
 
 Handlebars.registerHelper "getShapesForSlide", ->
-  currentPresentation = Meteor.Presentations.findOne({"presentation.current": true})
-  presentationId = currentPresentation?.presentation?.id
-  currentSlide = Meteor.Slides.findOne({"presentationId": presentationId, "slide.current": true})
+  currentSlide = getCurrentSlideDoc()
+    
   # try to reuse the lines above
   Meteor.Shapes.find({whiteboardId: currentSlide?.slide?.id})
 
@@ -259,11 +258,14 @@ Meteor.methods
   if !thickness.toString().match(/.*px$/)
     "#" + thickness + "px" # leading "#" - to be compatible with Firefox
   thickness
-
+    
 # applies zooming to the stroke thickness
 @zoomStroke = (thickness) ->
-  currentPresentation = Meteor.Presentations.findOne({"presentation.current": true})
-  presentationId = currentPresentation?.presentation?.id
-  currentSlide = Meteor.Slides.findOne({"presentationId": presentationId, "slide.current": true})
+  currentSlide = @getCurrentSlideDoc()
   ratio = (currentSlide?.slide.width_ratio + currentSlide?.slide.height_ratio) / 2
   thickness * 100 / ratio
+
+@getCurrentSlideDoc = -> # returns only one document
+  currentPresentation = Meteor.Presentations.findOne({"presentation.current": true})
+  presentationId = currentPresentation?.presentation?.id
+  currentSlide = Meteor.Slides.findOne({"presentationId": presentationId, "slide.current": true})

labs/meteor-client/client/views/whiteboard/slide.coffee

@@ -3,9 +3,8 @@ Template.slide.rendered = ->
   console.log "height = #{height}"
   $('#whiteboard-paper').height((height-$("#whiteboard-navbar").height()-10)+'px')
 
-  currentPresentation = Meteor.Presentations.findOne({"presentation.current": true})
-  presentationId = currentPresentation?.presentation?.id
-  currentSlide = Meteor.Slides.findOne({"presentationId": presentationId, "slide.current": true})
+  currentSlide = getCurrentSlideDoc()
+    
   if currentSlide?.slide?.png_uri?
     Template.slide.createWhiteboardPaper (wpm) ->
       Template.slide.displaySlide wpm
@@ -16,9 +15,7 @@ Template.slide.helpers
     callback(Template.slide.whiteboardPaperModel)
 
   displaySlide: (wpm) ->
-    currentPresentation = Meteor.Presentations.findOne({"presentation.current": true})
-    presentationId = currentPresentation?.presentation?.id
-    currentSlide = Meteor.Slides.findOne({"presentationId": presentationId, "slide.current": true})
+    currentSlide = getCurrentSlideDoc()
 
     wpm.create()
     wpm._displayPage(currentSlide?.slide?.png_uri)
@@ -28,9 +25,8 @@ Template.slide.helpers
     wpm?.moveCursor(pointer.x, pointer.y)
 
   manuallyDisplayShapes: ->
-    currentPresentation = Meteor.Presentations.findOne({"presentation.current": true})
-    presentationId = currentPresentation?.presentation?.id
-    currentSlide = Meteor.Slides.findOne({"presentationId": presentationId, "slide.current": true})
+    currentSlide = getCurrentSlideDoc()
+    
     wpm = Template.slide.whiteboardPaperModel
 
     shapes = Meteor.Shapes.find({whiteboardId: currentSlide?.slide?.id}).fetch()

labs/meteor-client/client/whiteboard_models/whiteboard_paper.coffee

@@ -806,10 +806,8 @@ class @WhiteboardPaperModel
 
     boardWidth = @containerWidth
     boardHeight = @containerHeight
-
-    currentPresentation = Meteor.Presentations.findOne({"presentation.current": true})
-    presentationId = currentPresentation?.presentation?.id
-    currentSlide = Meteor.Slides.findOne({"presentationId": presentationId, "slide.current": true})
+    
+    currentSlide = getCurrentSlideDoc()
 
     # TODO currentSlide undefined in some cases - will check later why
     imageWidth = boardWidth * (currentSlide?.slide.width_ratio/100) or boardWidth
@@ -824,8 +822,10 @@ class @WhiteboardPaperModel
     console.log "imageWidth: #{imageWidth}"
     console.log "imageHeight: #{imageHeight}"
     
+    currentPresentation = Meteor.Presentations.findOne({"presentation.current": true})
+    presentationId = currentPresentation?.presentation?.id
     currentSlideCursor = Meteor.Slides.find({"presentationId": presentationId, "slide.current": true})
-    
+
     _this = this
     currentSlideCursor.observe # watching the current slide changes
       changed: (newDoc, oldDoc) ->