--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/light9/web/edit-choice.coffee	Wed Jun 08 07:04:16 2016 +0000
@@ -0,0 +1,34 @@
+RDFS = 'http://www.w3.org/2000/01/rdf-schema#'
+Polymer
+    is: "edit-choice",
+    properties:
+        graph: {type: Object, notify: true},
+        uri: {type: String, notify: true},
+        label: {type: String, notify: true}
+
+    observers: [
+      'gotGraph(graph, uri)'
+      ]
+
+    dragover: (event) ->
+      event.preventDefault()
+      event.dataTransfer.dropEffect = 'copy'
+      @$.box.classList.add('over')
+
+    dragleave: (event) ->
+      @$.box.classList.remove('over')
+
+    drop: (event) ->
+      event.preventDefault()
+      @uri = event.dataTransfer.getData('text/uri-list')
+      @updateLabel()
+      
+    gotGraph: ->
+      @graph.runHandler(@updateLabel.bind(@))
+        
+    updateLabel: ->
+      @label = try
+          @graph.stringValue(@uri, RDFS + 'label')
+        catch
+          @uri
+