Maintain plot back-reference under BackRef trait

Author: mattpap

bokeh/src/main/scala/models/Annotations.scala

@@ -1,7 +1,6 @@
 package io.continuum.bokeh
 
-@model abstract class Annotation extends Renderer {
-    object plot extends Field[Plot]
+@model abstract class Annotation extends Renderer with BackRef {
     object level extends Field[RenderLevel](RenderLevel.Annotation)
 }
 

bokeh/src/main/scala/models/Plots.scala

@@ -78,6 +78,10 @@ package io.continuum.bokeh
     }
 }
 
+trait BackRef { self: Model =>
+    object plot extends Field[Plot]
+}
+
 object GridPlot {
     def apply[R](rows: R*)(implicit r: Row[R, Plot]): GridPlot = {
         new GridPlot().children(rows.toList.map(r.toList(_)))

bokeh/src/main/scala/models/Renderers.scala

@@ -41,8 +41,7 @@ package io.continuum.bokeh
     object level extends Field[RenderLevel](RenderLevel.Glyph)
 }
 
-@model abstract class GuideRenderer extends Renderer {
-    object plot extends Field[Plot]
+@model abstract class GuideRenderer extends Renderer with BackRef {
     object bounds extends Field[(Double, Double)] // TODO: Either[Auto, (Float, Float)]]
 
     object x_range_name extends Field[String]("default")

bokeh/src/main/scala/models/Tools.scala

@@ -4,9 +4,7 @@ package io.continuum.bokeh
     object geometries extends Field[List[Js.Obj]]
 }
 
-@model sealed abstract class Tool extends Model {
-    object plot extends Field[Plot]
-}
+@model sealed abstract class Tool extends Model with BackRef
 
 @model class PanTool extends Tool {
     object dimensions extends Field[List[Dimension]](List(Dimension.Width, Dimension.Height))