Use form factory for custom forms and support simple layouts.

horizon_contrib/forms/forms.py

@@ -8,7 +8,8 @@
 
 try:
     from crispy_forms.helper import FormHelper
-    from crispy_forms.layout import Div
+    from crispy_forms.layout import Div, Layout
+    from crispy_forms.bootstrap import Tab, TabHolder
     CRISPY = True
 except Exception as e:
     CRISPY = False
@@ -30,6 +31,14 @@ class SelfHandlingMixin(object):
 
     """A base :class:`Form <django:django.forms.Form>` class which includes
     processing logic in its subclasses.
+
+        tabs = {
+            'tab1': {
+                'name': 'Verbose Name'
+                'fields': ('field_name1',)
+            }
+        }
+
     """
     required_css_class = 'required'
 
@@ -57,6 +66,57 @@ def __init__(self, request=None, *args, **kwargs):
                 except Exception:
                     pass
 
+    def init_layout(self):
+        '''Call init for generic layout'''
+        self.helper.layout = Layout(TabHolder())
+        self.init_custom_tabs()
+
+    def get_tabs(self):
+        '''Merge form tabs with models tabs'''
+        tabs = getattr(self._meta.model, 'tabs', {})
+        tabs.update(getattr(self, 'tabs', {}))
+        return tabs
+
+    def init_custom_tabs(self):
+        '''init custom tabs
+        tabs = {
+            'tab1': {
+                'name': 'Verbose Name'
+                'fields': ('field_name1',)
+            }
+        }
+        '''
+        for tab_name, tab in self.get_tabs().items():
+            self.insert_tab(tab.get('name', tab_name), tab['fields'])
+
+    def get_main_fields(self, fields):
+        '''filter field which are included in custom tab'''
+        _fields = []
+        for field in fields:
+            if field not in self._custom_fields():
+                _fields.append(field)
+        return _fields
+
+    def _custom_fields(self):
+        '''returns acumulated fields from ``tabs``'''
+        fields = []
+        if not hasattr(self, '__custom_fields'):
+            for tab_name, tab in self.get_tabs().items():
+                fields += list(tab['fields'])
+            self.__custom_fields = fields
+        return self.__custom_fields
+
+    def insert_tab(self, name, fields, position=1):
+        '''Push tab to specific position
+        in the default state is after main widget tab
+        '''
+        self.helper.layout[0].insert(
+            position,
+            Tab(name,
+                *fields
+                )
+        )
+
 
 class SelfHandlingForm(SelfHandlingMixin, django_forms.Form):
 

horizon_contrib/forms/views.py

@@ -205,7 +205,8 @@ def get_form_class(self):
                 # use standard form instead of raising exception
                 pass
             else:
-                return form_class
+                return model_forms.modelform_factory(self.model, exclude=[],
+                                                     form=form_class)
 
         if self.form_class:
             return self.form_class