Re: OOP style
On 30 Aug 2005 05:46:20 -0700, "swansnow"
<schultz@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>> The root of all evil, if not avoided, is putting functionality > > into event handler methods of forms.
>
>I'm interested in hearing more about this.
>
>Say I have a form, and I need to limit the kind of characters allowed
>in the edit controls. So I hook each one up to the following event
>handler (below). Are you saying that I shouldn't do that? Instead, I
>should put this code into another unit (maybe a reusable library), and
>then simply call it from the event handler?
If this is going to happen a lot then I would create a descendant of
the TEdit control that has an extra property ( ValidChars maybe ) and
use that
It might reside in the Form's unit if it is unlikely to be used
elsewhere, especially if one is just doing a few tweaks, but
eventually it would probably land up in another unit either on its own
or with similar descendant controls
.
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