Re: Action and ActionConvertors

List for Users of Carlsbad Cubes' Technologies and Products <[email protected]> schrieb am 01.03.05 23:10:22:
> 
> >Sorry if this is clumsy but why don't implement the actions in your
> >wizard base (the usual, public action-way)? Just call a function
> >(abstract or default implementation) which is the overiden by your
> >wizared-enabled classes? You may then have/use your getters just through
> >some kind of delegation to these public actions...
> >
> >
> >Frank
> 
> hey that's what i ended up doing, and it's quite clean..
> 
> 	public Action aContinue = new AbstractAction() {
>         public void actionPerformed(java.awt.event.ActionEvent e) {
>             showNextCard();
>         }
>     };
> 
>     public Action aBack = new AbstractAction() {
>         public void actionPerformed(java.awt.event.ActionEvent e) {
>             showPreviousCard();
>         }
>     };
> 
> and
> 
>     public void setBack (Action act){
>         aBack = act;
>     }
> 
>     public void setContinueAction (Action act)
>     {
>         aContinue = act;
>     }
> 
> all in the WizardBase.. the subclasses that want to override just call these setters with
> the actions they want..
> 
> The only problem is, this must be done in the constructor of the subclasses, otherwise SwiX
> will pick up the default implementations from the base class using Reflection.

Hm, the interesting part is missing: your showPreviousCard() and showNextCard()
functions. In the descending classes you have all access you need to the actions,
eg enable/disable them and the like. The setXxxxAction(Action) methods are not
really needed...

> 
> Is this what you meant?
> 

Not quite, honestly ;) The whole idea was to get rid of re-implementing actions
in your descendent classes. Use delegation, if you have to -- it solves the
dependencies of real actions -- just implement the methods provided through
delegation by other ones if you do not use actions anymore...

Frank
> 
> -- 
> Nandan Bagchee
> 
> Excuse me, but what the hell?
> 
> 	-- Slava Pestov, on seeing:
>   	   FunctorParser parser = new FunctorParser();
>   	   BinaryFunctor toggleOther = parser.parseBinary("x.setEnabled(!x.isEnabled())",
> 	   							   JButton.class, ActionEvent.class);
> 
> 
> 
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