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
@@ -251,58 +272,60 @@ module Plemp::Views
     end 
   end
 
-  # The canvas with draggables.  Creates a draggable HTML element including
-  # the actually contents of the associated file per Draggable object in
-  # the database.
+  # The canvas with draggables repsenting the objects in the database.
   def draggables
     div.draggables! do
-      @draggables.each do |d|
-        file = UPLOAD_DIR + d.file
-        unless file.exist?
-          # The associated file of this Draggable object is gone, remove
-          # the object from the database too.
-          d.destroy
-          next
-        end
-        # Determine the MIME type.
-        file_type = `file --brief --mime-type #{file}`.chomp
-        mime_type = MIME::Types[file_type].first
-        if mime_type.nil?
-          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"
-        case mime_type.media_type
-          when "image"
-            img.draggable :id => d.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}\" " +
-              "style=\"#{default_style}\" " +
-              "src=\"#{R(StaticXX, "upload", d.file)}\" " + 
-              "controls=\"true\">" + "</video>\n"
-          when "audio"
-            # HTML5 is not supported by Markaby!
-            self <<
-            "    <audio class=\"draggable\" id=\"#{d.file}\" " +
-              "style=\"#{default_style};height=80px;\" " +
-              "src=\"#{R(StaticXX, "upload", d.file)}\" " + 
-              "controls=\"true\">" + "</audio>\n"
-          when "text"
-            div.draggable :id => d.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
-              em "#{d.file}: Unsupported file type!"
-            end
-        end # case
-      end 
+      @draggables.each { |d| @drag = d; draggable }
     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.
+      @drag.destroy
+      return ""
+    end
+    # Determine the MIME type.
+    file_type = `file --brief --mime-type #{file}`.chomp
+    mime_type = MIME::Types[file_type].first
+    if mime_type.nil?
+      mime_type = MIME::Type.new(file_type)
+    end
+    # Create an HTML element based on the type of the Draggable object.
+    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 => @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=\"#{@drag.file}\" " +
+          "style=\"#{default_style}\" " +
+          "src=\"#{R(StaticXX, "upload", @drag.file)}\" " + 
+          "controls=\"true\">" + "</video>\n"
+      when "audio"
+        # HTML5 is not supported by Markaby!
+        self <<
+        "    <audio class=\"draggable\" id=\"#{@drag.file}\" " +
+          "style=\"#{default_style};height=80px;\" " +
+          "src=\"#{R(StaticXX, "upload", @drag.file)}\" " + 
+          "controls=\"true\">" + "</audio>\n"
+      when "text"
+        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 => @drag.file, :style => default_style do
+          em "#{@drag.file}: Unsupported file type!"
+        end
+    end # case
+  end # def draggable
+
 end # module Plemp::Views