On Mar 2, 2006, at 9:08 AM, Ian R wrote:
Hey all --
I have 2 related, seemingly pretty basic concepts that, if somebody
could take a minute to explain them, I'd be grateful.
1. "Subclassing a subclass of Window"
Basically, I have a window, ListWindow, which, depending on how its
properties are set, will display records from any of my MySQL
tables, in a ListBox. Double-clicking on a row will open another
window in which you can edit the record.
Now, though the layout of ListWindow is suitable for any table, the
layout of the editing window is table-specific. Just to get myself
going, I've just been creating new editing windows -- table1Window,
table2Window, etc. -- with different layouts and copy/pasting the
shared methods, properties, handlers, etc.
However, it seems silly and anti-OOP to have the same code over and
over, and it seemed like the obvious solution was to make a
subclass of Window, EditWindow, with all the shared methods, props,
etc., and then make it the super for table1Window, table2Window,
etc. which would have different layouts.
But RB won't let me set "EditWindow" as a super class. Any ideas?
You can create a new class EditWindow whose super is window. Then set
the super of the table windows to EditWindow. EditWindow can contain
the common code and serve as an abstract class for methods that must
be handled by the subclasses.
Best,
Jack
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