By default filter out nodes that are not selectable and not folderish.

This can be overridden on the widget by setting show_all_nodes to True.

docs/HISTORY.txt

@@ -4,6 +4,10 @@ Changelog
 1.0.6 (unreleased)
 ------------------
 
+* By default filter out nodes that are not selectable and not folderish.
+  This can be overridden on the widget by setting show_all_nodes to True.
+  [maurits]
+
 * Added Dutch translation.
   [maurits]
 

plone/formwidget/contenttree/navtree.py

@@ -100,8 +100,14 @@ class NavtreeStrategy(SitemapNavtreeStrategy):
         return True
 
     def nodeFilter(self, node):
-        # Don't filter any nodes.
-        return True
+        # Returns True when the node should not be filtered.
+        if self.widget.show_all_nodes:
+            return True
+        # Show folderish nodes.
+        if getattr(node['item'], 'is_folderish', False):
+            return True
+        # Show selectable nodes.
+        return self.widget.bound_source.isBrainSelectable(node['item'])
 
     def decoratorFactory(self, node):
         new_node = super(NavtreeStrategy, self).decoratorFactory(node)

plone/formwidget/contenttree/widget.py

@@ -130,6 +130,10 @@ class ContentTreeBase(Explicit):
     formatItem = ('function(row, idx, count, value) {'
                   '  return row[1] + " (" + row[0] + ")"; }')
 
+    # By default, only show 'interesting' nodes, that is: nodes that
+    # are selectable or that are folders.
+    show_all_nodes = False
+
     def getTermByBrain(self,brain):
         return self.bound_source.getTermByBrain(brain)