def collect_fields(self,sfdict,*layouts):
fields = []
list_index = 0
for layout in layouts:
for elem in layout.walk():
if elem.field is not None:
sf = sfdict.get(elem.field,None)
if sf is None:
sf = self.create_field(elem.field)
sfdict[elem.field] = sf
elem.list_index = list_index
list_index += sf.list_values_count
fields.append(sf)
return fields
def add(f):
fields.append(f)
if f not in all_fields:
all_fields.append(f)
