possibility to unfile items from classifying folders (#3875)

src/pfwbged/folder/configure.zcml

@@ -30,6 +30,11 @@
       image="pfwbgedfolder_icon.png"
       />
 
+  <browser:resource
+      name="unlink_icon.png"
+      image="unlink_icon.png"
+      />
+
   <browser:page
       name="view"
       for="pfwbged.folder.IFolder"

src/pfwbged/folder/folder.py

@@ -3,6 +3,7 @@ from zope.interface import implements
 from five import grok
 from zope import component
 from zope import schema
+from zope.interface import Interface
 
 from zc.relation.interfaces import ICatalog
 from zope.app.intid.interfaces import IIntIds
@@ -30,6 +31,9 @@ from zope.app.intid.interfaces import IIntIds
 from z3c.relationfield import RelationValue
 from zope.lifecycleevent.interfaces import IObjectAddedEvent
 
+import z3c.table.column
+
+
 
 from pfwbged.collection.searchview import ResultsTable
 from collective.dms.thesaurus.keywordsfield import ThesaurusKeywords
@@ -108,11 +112,39 @@ grok.templatedir('templates')
 grok.context(IDexterityContainer)
 
 
+class ItemsTable(ResultsTable):
+    def setUpColumns(self):
+        columns = super(ItemsTable, self).setUpColumns()
+        # do not include the delete column, from classifying folders we only
+        # provide an icon for unlink
+        columns = [x for x in columns if x.__name__ != 'dms.delete']
+        return columns
+
+
+from collective.dms.basecontent.browser import column
+
+class UnfileColumn(column.IconColumn, column.LinkColumn):
+    grok.name('pfwbged.folder.unfile')
+    grok.adapts(Interface, Interface, ItemsTable)
+
+    header = u''
+    iconName = "++resource++unlink_icon.png"
+    linkContent = _('Unfile')
+
+    def getLinkURL(self, item):
+        for id, child in item.getObject().contentItems():
+            if not ILink.providedBy(child):
+                continue
+            if child.folder.to_object == self.context:
+                return item.getURL() + '/' + id + '/delete_confirmation'
+        return '#'
+
+
 class ClassifiedItems:
 
     @property
     def table(self):
-        table = ResultsTable(self.context, self.request)
+        table = ItemsTable(self.context, self.request)
         table.values = self.documents()
         table.update()
         return table

src/pfwbged/folder/link.py

@@ -90,6 +90,8 @@ class DeleteColumn(column.DeleteColumn):
     grok.name('dms.delete')
     grok.adapts(Interface, Interface, LinksTable)
 
+    iconName = "++resource++unlink_icon.png"
+
 
 class LinkViewlet(BaseViewlet):
     grok.order(15)