sortable categories

wcs/admin/categories.ptl

@@ -93,11 +93,12 @@ class CategoryPage(Directory):
 
 
 class CategoriesDirectory(Directory):
-    _q_exports = ['', 'new']
+    _q_exports = ['', 'new', 'update_order']
 
     def _q_index [html] (self):
         get_response().breadcrumb.append( ('categories/', _('Categories')) )
-        html_top('categories', title = _('Categories'))
+        html_top('categories', title = _('Categories'),
+                scripts = ['/js/prototype.js', '/js/scriptaculous/scriptaculous.js'] )
 
         '<div class="explanation">'
         '<p>%s</p>' % _('Categories are used to sort the different forms.')
@@ -107,15 +108,44 @@ class CategoriesDirectory(Directory):
           <li><a href="new">%s</a></li>
         </ul>""" % _('New Category')
 
-        '<ul class="biglist">'
-        for category in Category.select(order_by = 'name'):
-            '<li>'
+        '<ul class="biglist" id="category-list">'
+        categories = Category.select()
+        Category.sort_by_position(categories)
+        for category in categories:
+            '<li id="fieldlistitem_%s">' % category.id
             '<strong class="label">%s</strong>' % category.name
             '<p class="commands">'
             command_icon('%s/edit' % category.id, 'edit')
             command_icon('%s/delete' % category.id, 'remove')
             '</p></li>'
         '</ul>'
+        '''<script type="text/javascript">
+// <![CDATA[
+Sortable.create('category-list', {dropOnEmpty:true,constraint:false,
+    containement:["category-list"],
+    onUpdate:function(){
+        new Ajax.Request('update_order', {
+            method:'post',
+            parameters:Sortable.serialize('category-list'),
+            onComplete:function(request){new Effect.Highlight('category-list',{});},
+            evalScripts:true,
+            asynchronous:true})}});\n
+// ]]>
+</script>'''
+
+
+    def update_order(self):
+        request = get_request()
+        new_order = request.form['category-list[]']
+        categories = Category.select()
+        dict = {}
+        for l in categories:
+            dict[str(l.id)] = l
+        for i, o in enumerate(new_order):
+            dict[o].position = i + 1
+            dict[o].store()
+        return 'ok'
+
 
     def new [html] (self):
         get_response().breadcrumb.append( ('categories/', _('Categories')) )

wcs/admin/forms.ptl

@@ -272,7 +272,8 @@ class FormsDirectory(Directory):
             '<p>%s</p>' % _('You first have to define roles.')
 
 
-        cats = Category.select(order_by = 'name')
+        cats = Category.select()
+        Category.sort_by_position(cats)
         one = False
         formdefs = FormDef.select(order_by = 'name')
         for c in cats:

wcs/categories.py

@@ -6,6 +6,7 @@ class Category(StorableObject):
     name = None
     url_name = None
     description = None
+    position = None
 
     def __init__(self, name = None):
         StorableObject.__init__(self)
@@ -35,3 +36,15 @@ class Category(StorableObject):
         return False
     has_urlname = classmethod(has_urlname)
 
+    def sort_by_position(cls, categories):
+        def cmp_position(x, y):
+            if x.position == y.position:
+                return 0
+            if x.position is None:
+                return 1
+            if y.position is None:
+                return -1
+            return cmp(x.position, y.position)
+        categories.sort(cmp_position)
+    sort_by_position = classmethod(sort_by_position)
+

wcs/forms/root.ptl

@@ -661,7 +661,8 @@ class RootDirectory(AccessControlled, Directory):
             self.form_list(list_forms, category = self.category,
                     session = session, user_forms = user_forms)
         else:
-            cats = Category.select(order_by = 'name')
+            cats = Category.select()
+            Category.sort_by_position(cats)
             one = False
             for c in cats:
                 l2 = [x for x in list_forms if x.category_id == c.id]