Split the draggable div generating code from Views#draggables ; added the Draggable controller.

plemp.rb

@@ -106,6 +106,27 @@ module Plemp::Controllers
     end
   end
 
+  # = The draggable controller
+  #
+  # Controller that provides direct access to the HTML generating code
+  # for draggable objects.
+  #
+  # path:: /draggable/<id>
+  # view:: views#Draggable
+  class DraggableX
+    # Retrieves the draggable with the given _id_ from the database and
+    # returns the HTML.
+    def get(id)
+      @drag = Draggable.find_by_file(id)
+      if @drag.nil?
+       @status = "404"
+       return "Error 404: Unknown draggable ID: #{id}"
+      end
+      # Call draggable from the views, but do not wrap the layout.
+      mab(false) { draggable }
+    end
+  end
+
   # = The position save controller
   #
   # Controller used through AJAX request by the main page for committing
@@ -251,18 +272,22 @@ module Plemp::Views
     end 
   end
 
-  # The canvas with draggables.  Creates a draggable HTML element including
+  # The canvas with draggables repsenting the objects in the database.
-  # the actually contents of the associated file per Draggable object in
-  # the database.
   def draggables
     div.draggables! do
-      @draggables.each do |d|
+      @draggables.each { |d| @drag = d; draggable }
-        file = UPLOAD_DIR + d.file
+    end
+  end # def draggables
+
+  # Creates a draggable HTML (block) element including the actually
+  # contents of the associated file for Draggbale object _d_.
+  def draggable
+    file = UPLOAD_DIR + @drag.file
     unless file.exist?
       # The associated file of this Draggable object is gone, remove
       # the object from the database too.
-          d.destroy
+      @drag.destroy
-          next
+      return ""
     end
     # Determine the MIME type.
     file_type = `file --brief --mime-type #{file}`.chomp
@@ -271,38 +296,36 @@ module Plemp::Views
       mime_type = MIME::Type.new(file_type)
     end
     # Create an HTML element based on the type of the Draggable object.
-        default_style = "left:#{d.left}px;top:#{d.top}px;z-index:0;display:none"
+    default_style = "left:#{@drag.left}px;top:#{@drag.top}px;z-index:0;display:none"
     case mime_type.media_type
       when "image"
-            img.draggable :id => d.file, :style => default_style, 
+        img.draggable :id => @drag.file, :style => default_style, 
                       :src => R(StaticXX, "upload", file.basename),
                       :alt => file.basename
       when "video"
         # HTML5 is not supported by Markaby!
         self << \
-            "    <video class=\"draggable\" id=\"#{d.file}\" " +
+        "    <video class=\"draggable\" id=\"#{@drag.file}\" " +
           "style=\"#{default_style}\" " +
-              "src=\"#{R(StaticXX, "upload", d.file)}\" " + 
+          "src=\"#{R(StaticXX, "upload", @drag.file)}\" " + 
           "controls=\"true\">" + "</video>\n"
       when "audio"
         # HTML5 is not supported by Markaby!
         self <<
-            "    <audio class=\"draggable\" id=\"#{d.file}\" " +
+        "    <audio class=\"draggable\" id=\"#{@drag.file}\" " +
           "style=\"#{default_style};height=80px;\" " +
-              "src=\"#{R(StaticXX, "upload", d.file)}\" " + 
+          "src=\"#{R(StaticXX, "upload", @drag.file)}\" " + 
           "controls=\"true\">" + "</audio>\n"
       when "text"
-            div.draggable :id => d.file, :style => default_style do
+        div.draggable :id => @drag.file, :style => default_style do
           CodeRay.scan_file(file).div(:tab_width => 2, 
                                       :line_numbers => :inline)
         end
       else
-            span.draggable :id => d.file, :style => default_style do
+        span.draggable :id => @drag.file, :style => default_style do
-              em "#{d.file}: Unsupported file type!"
+          em "#{@drag.file}: Unsupported file type!"
         end
     end # case
-      end 
+  end # def draggable
-    end
-  end # def draggables
 
 end # module Plemp::Views