Issue collective#298, Add offset as a configuration option to the col…

…lection tile.

This adds a configuration option "Start at item".  With this option two or more collection tiles
can be used to show different slices of the same collection.

src/collective/cover/tiles/collection.py

@@ -61,6 +61,13 @@ class ICollectionTile(IPersistentCoverTile, form.Schema):
         required=False,
     )
 
+    form.omitted('offset')
+    form.no_omit(IDefaultConfigureForm, 'offset')
+    offset = schema.Int(
+        title=_(u'Start at item'),
+        required=False,
+    )
+
     footer = schema.TextLine(
         title=_(u'Footer'),
         required=False,
@@ -92,10 +99,15 @@ def results(self):
         else:
             size = 4
 
+        offset = 0
+        offset_conf = [i for i in self.configured_fields if i['id'] == 'offset']
+        if offset_conf:
+            offset = int(offset_conf[0].get('offset', 0))
+
         uuid = self.data.get('uuid', None)
         obj = uuidToObject(uuid)
         if uuid and obj:
-            return obj.results(batch=False)[:size]
+            return obj.results(batch=False)[offset:offset + size]
         else:
             self.remove_relation()
             return []
@@ -154,6 +166,9 @@ def get_configured_fields(self):
                 if 'size' in field_conf:
                     field['size'] = field_conf['size']
 
+                if 'offset' in field_conf:
+                    field['offset'] = field_conf['offset']
+
             results.append(field)
 
         return results

src/collective/cover/tiles/configuration_widgets/textline.pt

@@ -47,21 +47,35 @@
                             accesskey view/accesskey|nothing;"/>
         </div>
 
-        <span i18n:translate="">HTML tag</span>
-        <select id="" name="" class=""
-            tabindex="" accesskey=""
-            tal:attributes="id string:${view/id}-htmltag;
-                            name string:${view/name}.htmltag;
-                            class view/klass;
-                            tabindex view/tabindex;
-                            accesskey view/accesskey|nothing;"
-            tal:define="values python:['h1', 'h2', 'h3', 'h4']">
+        <tal:if condition="python: isinstance (view.field, modules['zope.schema'].Int)">
+          <span i18n:translate="">Position</span>
+          <input type="text" id="" name="" class="" size="2"
+                 tabindex="" accesskey=""
+                 tal:attributes="id string:${view/id}-offset;
+                                 name string:${view/name}.offset;
+                                 class view/klass;
+                                 tabindex view/tabindex;
+                                 value python:stored_data.get('offset', None);
+                                 accesskey view/accesskey|nothing;"/>
+        </tal:if>
+
+        <tal:if condition="python: isinstance (view.field, modules['zope.schema'].TextLine)">
+          <span i18n:translate="">HTML tag</span>
+          <select id="" name="" class=""
+                  tabindex="" accesskey=""
+                  tal:attributes="id string:${view/id}-htmltag;
+                                  name string:${view/name}.htmltag;
+                                  class view/klass;
+                                  tabindex view/tabindex;
+                                  accesskey view/accesskey|nothing;"
+                  tal:define="values python:['h1', 'h2', 'h3', 'h4']">
 
             <option tal:repeat="value values"
                     tal:attributes="value value;
                                     selected python:stored_data.get('htmltag', None) == value and 'selected' or None"
                     tal:content="python:value.upper()">HTML TAG</option>
-        </select>
+          </select>
+        </tal:if>
 
     </tal:stored_data>
 </html>