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CheckBoxJList.javaAPI DocExample5279Mon Jan 09 11:01:58 GMT 2006None

CheckBoxJList

public class CheckBoxJList extends JList implements ListSelectionListener

Fields Summary
static Color
listForeground
static Color
listBackground
static Color
listSelectionForeground
static Color
listSelectionBackground
HashSet
selectionCache
int
toggleIndex
boolean
toggleWasSelected
Constructors Summary
public CheckBoxJList()


      
        super();
        setCellRenderer (new CheckBoxListCellRenderer());
        addListSelectionListener (this);
Methods Summary
public static voidmain(java.lang.String[] args)

        JList list = new CheckBoxJList ();
        DefaultListModel defModel = new DefaultListModel();
        list.setModel (defModel);
        String[] listItems = {
            "Chris", "Joshua", "Daniel", "Michael",
            "Don", "Kimi", "Kelly", "Keagan"
        };
        Iterator it = Arrays.asList(listItems).iterator();
        while (it.hasNext())
            defModel.addElement (it.next());
        // show list
        JScrollPane scroller =
            new JScrollPane (list,
                            ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
                            ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        JFrame frame = new JFrame ("Checkbox JList");
        frame.getContentPane().add (scroller);
        frame.pack();
        frame.setVisible(true);
public voidvalueChanged(javax.swing.event.ListSelectionEvent lse)

        System.out.println (lse);
        if (! lse.getValueIsAdjusting()) {
            removeListSelectionListener (this);

            // remember everything selected as a result of this action
            HashSet newSelections = new HashSet();
            int size = getModel().getSize();
            for (int i=0; i<size; i++) {
                if (getSelectionModel().isSelectedIndex(i)) {
                    newSelections.add (new Integer(i));
                }
            }

            // turn on everything that was previously selected
            Iterator it = selectionCache.iterator();
            while (it.hasNext()) {
                int index = ((Integer) it.next()).intValue();
                System.out.println ("adding " + index);
                getSelectionModel().addSelectionInterval(index, index);
            }

            // add or remove the delta
            it = newSelections.iterator();
            while (it.hasNext()) {
                Integer nextInt = (Integer) it.next();
                int index = nextInt.intValue();
                if (selectionCache.contains (nextInt))
                    getSelectionModel().removeSelectionInterval (index, index);
                else
                    getSelectionModel().addSelectionInterval (index, index);
            }

            // save selections for next time
            selectionCache.clear();
            for (int i=0; i<size; i++) {
                if (getSelectionModel().isSelectedIndex(i)) {
                    System.out.println ("caching " + i);
                    selectionCache.add (new Integer(i));
                }
            }

            addListSelectionListener (this);

        }