ToggleSelectionModel.java

/*
 * ToggleSelectionModel.java
 *
 * Created on March 6, 2006, 3:26 PM
 *
 */

package ika.gui;

import javax.swing.*;

/**
 * ToggleSelectionModel toggles the selection state of an item clicked in a JList.
 * modified version of http://java.sun.com/products/jfc/tsc/tech_topics/jlist_1/jlist.html
 */
public class ToggleSelectionModel extends DefaultListSelectionModel {
    
    // toggling should only occur for the first update generated by a mouse
    // press-drag-release gesture. The gestureStarted flag keeps track of this.
    boolean gestureStarted = false;
    
    public void setSelectionInterval(int index0, int index1) {
        
        // in single selection mode, only the second argument is used.
        if (this.getSelectionMode() == this.SINGLE_SELECTION) {
            if (this.isSelectedIndex(index1) && !gestureStarted)
                super.removeSelectionInterval(index0, index1);
            else
                super.setSelectionInterval(index0, index1);
        } else {
            // multiple selection
            if (isSelectedIndex(index0) && index0 == index1 && !gestureStarted) {
                super.removeSelectionInterval(index0, index1);
            } else {
                super.addSelectionInterval(index0, index1);
            }
        }
        gestureStarted = true;
    }
    
    public void setValueIsAdjusting(boolean isAdjusting) {
        if (isAdjusting == false) {
            gestureStarted = false;
        }
    }
}