def size(self, dialog):
"""
Calculates size of the layout, based on its children.
@param dialog The Dialog which contains the layout
"""
if dialog is None:
return
Widget.size(self, dialog)
height = 0
if len(self.content) < 2:
width = 0
else:
width = -self.padding
for item in self.content:
item.size(dialog)
height = max(height, item.height)
width += item.width + self.padding
self.width, self.height = width+self.padding, height
self.expandable = [x for x in self.content if x.is_expandable()]
