On Jun 3, 2006, at 11:22 AM, Norman Palardy wrote:
Note that this is an excellent example of a situation where a
Class Interface will let you treat either the canvas, or the
container it is in, as the same kind of thing. This means: define
a class interface with your GetText and SetText operations, and
assign the class interface to both the container and canvas
class. Now, you can declare a variable to be of the type of the
class interface, and use it to access either.
That's a thought...
But how would that apply? The container control isn't really
getting any variables set - it is just passing the variables
through to the canvas, so I really don't want to treat them the
same. Or do I?
I could see where for example, you had a list of items (array)
that you wanted to be able to populate either a listbox or
popuplist with. You define the class interface with governing
functions to populate the control depending on its type -> if
control isA Listbox then.... etc
I am a total newb as far a class interfaces go - I have rarely
used them, except in the above example.
You really probably want the container control to act like it is
the one and only thing you deal with ad not necessarily expose it's
guts to you.
Or you could have a method in your container that returned a
reference to any the embedded controls so you could deal with them
directly.
Personally I'd make the container act like it is the whole control
that I deal with and add appropriate methods to it.
I've got an entire RTF editor as a container control I'm working on
using Alfred's WordGuise plugin and it's literally drag and drop it
into a project and add it to a window and you're 99% done. add
implementations for the actions to load and save a document and
that's it
I should have been clearer: there's a good chance you won't need to
use a class interface. But, for example, if you have low-level
generic code, which sometimes you're using inside the container
control, and sometimes outside, it will greatly simplify your code to
use a class interface. So I just wanted to point out the possibility.
Guyren G Howe
guyren-at-relevantlogic.com
http://relevantlogic.com
REALbasic, PHP, Python programming
PostgreSQL, MySQL database design and consulting
Technical writing and training
_______________________________________________
Unsubscribe or switch delivery mode:
<http://www.realsoftware.com/support/listmanager/>
Search the archives of this list here:
<http://support.realsoftware.com/listarchives/lists.html>
