source: src/main/java/genius/gui/panels/MultiListSelectionModel.java

package genius.gui.panels;

import javax.swing.DefaultListSelectionModel;

/**
 * Selection model for JList's which allows multiple elements to be selected
 * by toggling an item when clicked.
 * 
 * @author Mark Hendrikx (m.j.c.hendrikx@student.tudelft.nl)
 * @version 05/12/11
 */
public class MultiListSelectionModel extends DefaultListSelectionModel {
        private static final long serialVersionUID = 3815068403424389993L;
        private int i0 = -1;
        private int i1 = -1;

        public void setSelectionInterval(int index0, int index1) {
                if (i0 == index0 && i1 == index1) {
                        if (getValueIsAdjusting()) {
                                setValueIsAdjusting(false);
                                setSelection(index0, index1);
                        }
                } else {
                        i0 = index0;
                        i1 = index1;
                        setValueIsAdjusting(false);
                        setSelection(index0, index1);
                }
        }

        private void setSelection(int index0, int index1) {
                if (super.isSelectedIndex(index0)) {
                        super.removeSelectionInterval(index0, index1);
                } else {
                        super.addSelectionInterval(index0, index1);
                }
        }
}