On Sunday 21 July 2002 10:22 am, Lily Smith wrote:

> I am a newbie. How can I implement a radio button group and then
> deal with the user input accordingly?

I'm no expert, but...

You don't say what language (eToy, Smalltalk) you're using, or which 
UI idiom (MVC, Morphic).

However, in Smalltalk programming of Morphic, you can use the stepping 
behavior of Morphs to update state. So, for instance, if you have a 
particular instance variable that gets set by some buttons, you can 
use several EtoyUpdatingThreePhaseButtonMorph that are set up to set 
their states based on that value:

b1 := EtoyUpdatingThreePhaseButtonMorph radioButton.
b1 target: someObject;
	actionSelector: #value: ;
	arguments: { 1 };
	getSelector: #isValue: .
b1 position: 100 at 100; openInWorld.

b2 := EtoyUpdatingThreePhaseButtonMorph radioButton.
b2 target: someObject;
	actionSelector: #value: ;
	arguments: { 2 };
	getSelector: #isValue: .
b2 position: 100 at 120; openInWorld.

the code above is untested, and will need to be changed for your 
application, but you get the idea.

Or you could use PluggableButtonMorphs and send them #changed: 
#someAspect messages from your model; all the PBM's that have a 
getSelector of #someAspect would then update themselves (which means 
to set their color to their onColor or their offColor).

-- 
Ned Konz
http://bike-nomad.com
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