🚀 go-pugleaf

Andy Nguyen <nguyevu@turing.scs.carleton.ca> wrote:

> My JComboBox has implemeted the "actionPerfomed" and the
> "itemStateChanged" functions, but it seemed not responding.
> You know why ? but the same codes embedding under the ChoiceControl
> working fine.

Since you did not post any code, I can only guess what your 
problem is.

Events are only delivered to those objects that request them.  If 
you have defined actionPerformed() and itemStateChanged() methods 
in a class you have derived from JComboBox, that is not all that 
is required to "catch" these events.  You must also request that 
these methods be called.

To receive an ActionEvent (i.e. to have actionPerformed() called) 
you must implement the ActionListener interface.  This means you 
must add "implements ActionListener" to your class declaration, 
and define the actionPerformed() method, as required by the 
interface.

Then you must call addActionListener() specifying the object that 
implements the interface.  In your case, I believe you are doing 
this in the JComboBox derived class itself, so you would pass 
"this" as the argument to addActionListener().

-- 
Regards,

John P. McGrath
<mcgrath@enter.net>
<jpm@nscs.fast.net>