Made a slight change to window position randomization; now only non-modal windows...
[philo.git] / forms / entities.py
1 from django.forms.models import ModelFormMetaclass, ModelForm
2 from django.utils.datastructures import SortedDict
3 from philo.utils import fattr
4
5
6 __all__ = ('EntityForm',)
7
8
9 def proxy_fields_for_entity_model(entity_model, fields=None, exclude=None, widgets=None, formfield_callback=lambda f, **kwargs: f.formfield(**kwargs)):
10         field_list = []
11         ignored = []
12         opts = entity_model._entity_meta
13         for f in opts.proxy_fields:
14                 if not f.editable:
15                         continue
16                 if fields and not f.name in fields:
17                         continue
18                 if exclude and f.name in exclude:
19                         continue
20                 if widgets and f.name in widgets:
21                         kwargs = {'widget': widgets[f.name]}
22                 else:
23                         kwargs = {}
24                 formfield = formfield_callback(f, **kwargs)
25                 if formfield:
26                         field_list.append((f.name, formfield))
27                 else:
28                         ignored.append(f.name)
29         field_dict = SortedDict(field_list)
30         if fields:
31                 field_dict = SortedDict(
32                         [(f, field_dict.get(f)) for f in fields
33                                 if ((not exclude) or (exclude and f not in exclude)) and (f not in ignored) and (f in field_dict)]
34                 )
35         return field_dict
36
37
38 # BEGIN HACK - This will not be required after http://code.djangoproject.com/ticket/14082 has been resolved
39
40 class EntityFormBase(ModelForm):
41         pass
42
43 _old_metaclass_new = ModelFormMetaclass.__new__
44
45 def _new_metaclass_new(cls, name, bases, attrs):
46         formfield_callback = attrs.get('formfield_callback', None)
47         if formfield_callback is None:
48                 formfield_callback = lambda f, **kwargs: f.formfield(**kwargs)
49         new_class = _old_metaclass_new(cls, name, bases, attrs)
50         opts = new_class._meta
51         if issubclass(new_class, EntityFormBase) and opts.model:
52                 # "override" proxy fields with declared fields by excluding them if there's a name conflict.
53                 exclude = (list(opts.exclude or []) + new_class.declared_fields.keys()) or None
54                 proxy_fields = proxy_fields_for_entity_model(opts.model, opts.fields, exclude, opts.widgets, formfield_callback) # don't pass in formfield_callback
55                 new_class.proxy_fields = proxy_fields
56                 new_class.base_fields.update(proxy_fields)
57         return new_class
58
59 ModelFormMetaclass.__new__ = staticmethod(_new_metaclass_new)
60
61 # END HACK
62
63
64 class EntityForm(EntityFormBase): # Would inherit from ModelForm directly if it weren't for the above HACK
65         def __init__(self, *args, **kwargs):
66                 initial = kwargs.pop('initial', None)
67                 instance = kwargs.get('instance', None)
68                 if instance is not None:
69                         new_initial = {}
70                         for f in instance._entity_meta.proxy_fields:
71                                 if self._meta.fields and not f.name in self._meta.fields:
72                                         continue
73                                 if self._meta.exclude and f.name in self._meta.exclude:
74                                         continue
75                                 new_initial[f.name] = f.value_from_object(instance)
76                 else:
77                         new_initial = {}
78                 if initial is not None:
79                         new_initial.update(initial)
80                 kwargs['initial'] = new_initial
81                 super(EntityForm, self).__init__(*args, **kwargs)
82         
83         @fattr(alters_data=True)
84         def save(self, commit=True):
85                 cleaned_data = self.cleaned_data
86                 instance = super(EntityForm, self).save(commit=False)
87                 
88                 for f in instance._entity_meta.proxy_fields:
89                         if not f.editable or not f.name in cleaned_data:
90                                 continue
91                         if self._meta.fields and f.name not in self._meta.fields:
92                                 continue
93                         if self._meta.exclude and f.name in self._meta.exclude:
94                                 continue
95                         setattr(instance, f.attname, f.get_storage_value(cleaned_data[f.name]))
96                 
97                 if commit:
98                         instance.save()
99                         self.save_m2m()
100                 
101                 return instance