re[3]: reading table selected items after filter changed - SWT

Cool.

 

As an FYI, there is already a Calculation implementation that will get you the first element of any list (see Calculations.elementAt() ).

 

That works great if your list is single selection.

 

My funky code is useful for providing an intuitive experience in the multi-select case - but, as you say, it does rely on the list selection model.  I suppose another (diametrically opposite) option would be to include Calculations.oneElement() in the mix and not show any detail view if multiple items are selected.

 

- K

 

Thanks Kevin,

For SWT there was a bit of difference with the SWT EventTableViewer (there
was no EventSelectionModel type of class).  But eventTableViewer does have a
getSelected() method which returns an Event list of selected items.  I
created a similar Calculation class which gives the first selected item in
the list, as follows:

import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.calculation.AbstractCalculation;
import ca.odell.glazedlists.event.ListEvent;
import ca.odell.glazedlists.event.ListEventListener;

public class FirstSelectedElementCalculation<E> extends
AbstractCalculation<E> implements ListEventListener<E> {

    private final EventList<E> source;

    public FirstSelectedElementCalculation(EventList<E> source) {
        super( source.size() > 0 ? source.get( 0) : null);

        this.source = source;
        this.source.addListEventListener(this);
    }

    public void dispose() {
        this.source.removeListEventListener(this);
    }

    public void listChanged(ListEvent<E> listChanges) {
        final E oldValue = getValue();
        setValue(listChanges.getSourceList().size() > 0 ?
listChanges.getSourceList().get(0) : null);
        final E newValue = getValue();
        fireValueChange(oldValue, newValue);
    }

}

Then, I added the following code to link the eventTableViewer sel ected
eventList to this calculation:

new FirstSelectedElementCalculation<Employee>
(eventTableViewer.getSelected())
    .addPropertyChangeListener(new PropertyChangeListener() {
        public void propertyChange(PropertyChangeEvent event) {
            //here I bind ((Employee)event.getNewValue()) to my detail view model.
        }
    }
);






Kevin Day wrote:
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