Specifies any changes the parent plans to make to the child's geometry or
Returns the child widget's preferred geometry.
Specifies the widget.
To discover a child's preferred geometry,
the child's parent sets any changes
that it intends to make to the child's geometry in the corresponding fields of
the intended structure, sets the corresponding bits in intended.request_mode,
clears all bits in the preferred_return->request_mode and checks the
query_geometry field of the specified widget's class record.
If query_geometry is not NULL,
calls the query_geometry procedure and passes as arguments the
specified widget, intended, and preferred_return structures.
If the intended argument is NULL,
replaces it with a pointer to an
structure with request_mode=0 before calling query_geometry.