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hooking up arrays of List

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  hooking up arrays of List "Roedy Green" <roedy.green@THRWHITE.remove-dii-this> - 2011-04-27 15:37 +0000
    Re: hooking up arrays of "Thomas Hawtin" <thomas.hawtin@THRWHITE.remove-dii-this> - 2011-04-27 15:37 +0000

#2230 — hooking up arrays of List

  To: comp.lang.java.gui
I have doubly dimensioned arrays of widgets.  I would like to set the
up with ChangeListeners -- each individual e.g.

 rgbSlider[0][0].addChangeListener( new ChangeListener() {
            /**
             * Invoked when the target of the listener has changed its
state.
             *
             * @param e a ChangeEvent object
             */
            public void stateChanged( ChangeEvent e )
                {
                int value = rgbSlider[0][0].getValue();
                rgbDecSpinner[0][0].setValue( value );
                }
        } );

What is the cleanest way to pass the two subscript parameters to the
stateChanged method? or concoct a common listener that handles all 6
widgets?
-- 
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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#2231 — Re: hooking up arrays of

  To: comp.lang.java.gui
Roedy Green wrote:
> I have doubly dimensioned arrays of widgets.  I would like to set the
> up with ChangeListeners -- each individual e.g.

> What is the cleanest way to pass the two subscript parameters to the
> stateChanged method? or concoct a common listener that handles all 6
> widgets?

I suggest not passing the subscripts at all. Instead pass the objects 
that you are actually using:

         final BoundedRangeModel rgbSlider = rgbSliders[i][j];
         final BoundedRangeModel rgbDecSlider = rgbDecSliders[i][j];

         rgbSlider.addChangeListener(new ChangeListener() {
                 public void stateChanged(ChangeEvent event) {
                     int value = rgbSlider.getValue();
                     rgbDecSpinner.setValue(value);
                 }
         });

IMO, a better way to go about it is not to duplicate state 
unnecessarily. Instead make the rgbDecSliders always read data from 
their associated rgbSlider. rgbDecSliders fire a change event in 
response to rgbSlider doing so (put be careful not to leak).

Tom Hawtin

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