Custom Properties

[Dan Shafer]

One important use of setProp in particular comes into play when you create a
library that has values you don't want outside programs/users to change. You
just set up a setProp handler that politely, silently or rudely refuses to
set the property's value. This is an important idea in object-oriented
design.

On 4/12/06, Devin Asay <devin_asay at byu.edu> wrote:
>
>
> On Apr 12, 2006, at 11:44 AM, Thomas McGrath III wrote:
>
> > Does anyone have any examples on the get/setProps in real usage? I
> > have been using custom props but not the setProp etc. I would love
> > some more insightful ideas on it's usage.
>
> The way I use it is much more pedestrian than the Marks'. For me it's
> a really easy way to make sure my interface objects get set to the
> proper states. For example, let's say I want to toggle between an
> 'editable' and 'noneditable' mode for a text editor:
>
> setProp editMode pMode
>    if pMode then
>      enable button "Save"
>      enable button "TextColor"
>      set the lockText of fld "myfld" to true
>      set the traversalOn of fld "myFld" to true
>    else
>      disable button "Save"
>      disable button "TextColor"
>      set the lockText of fld "myfld" to false
>      set the traversalOn of fld "myFld" to false
>    end if
>    pass editMode -- the docs say you have to explicitly pass it to
> have it set the prop
> end editMode
>
> Anyway, this is a crude example, but illustrates how it's been most
> useful to me. There may be several events in my program that could
> trigger a change in edit mode for this field, but in each case all
> I'd have to do would be to
>
>    set the editMode of cd "editor" to true ## or false
>
> Devin
>
> Devin Asay
> Humanities Technology and Research Support Center
> Brigham Young University
>
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