When the user clicks on a button of a top-level widget (a Frame or
a Dialog), the method
“add_toplevel_object” of
wxGladeFrame is called: this is responsible for
the addition of the widget to the application. This happens in this
way:
the name of the class of the widget to add is obtained: this
is done with the use of the “common.refs”
dictionary, which maps the ids of the buttons of the palette to the
class names of the widgets.
with the name just obtained, the appropriate factory function
for the widget to add is got from the
“common.widgets” dictionary. This function
must accept three parameters: a reference to the parent widget
(None in this case), a reference to the sizer to which
the widget will be added (again None for top-level
windows) and the zero-based position inside the sizer (once again,
this is unused for top-level windows)
the call of the factory function actually builds the widgets
and inserts it in the “common.app_tree”
tree with a call to its method
“insert”. The
“__init__” method of the widget
also builds all the Properties of the object and stores them in the
'self.properties' dictionary