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Re: GUI structure

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  To: comp.lang.java.gui
"dwj" <danielwatkinslearn@hotmail.com> writes:

> My problem... Each of the image processing filters has its own set of
> bespoke attributes (such as threshold) that I want the user to be able
> to view and set.  When these are set, I then want them to be updated
> in the filter object which the values apply to.  I was thinking of
> creating a different form for each filter to set and view the
> attributes but I am unsure how I should link the forms to the filter
> classes.  An instance of each filter class won't always exist.

One approach would be to have your filter classes implement a method
that either returns a dialog item to set its options, or else invokes a
dialog and sets its options.

That provides a link between the option form and the class, and doesn't
involve any instance at all.  This will solve the problem for the case
where you want to set an individual filter's options or parameters.

It doesn't solve the case of having a general default set of attributes
available that can be set and persist independent of any particular
filter instance.  That would be a bit more complicated, and would
involve having some data structure that holds the option information.
(Perhaps this data structure could be a dialog object itself?) and the
use of static storage and methods in the filter classes.

-- 
Thomas A. Russ,  USC/Information Sciences Institute

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GUI structure "dwj" <dwj@THRWHITE.remove-dii-this> - 2011-04-27 15:31 +0000
  Re: GUI structure "tar" <tar@THRWHITE.remove-dii-this> - 2011-04-27 15:31 +0000

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