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ICEpdf Java Swing/AWT reference implementation.

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package org.icepdf.ri.common;

import javax.swing.*;
import javax.swing.plaf.basic.BasicCheckBoxMenuItemUI;
import javax.swing.plaf.synth.SynthCheckBoxMenuItemUI;

/**
 * JCheckboxMenuItem that doesn't hide the menu when clicked
 */
public class PersistentJCheckBoxMenuItem extends JCheckBoxMenuItem {

    public PersistentJCheckBoxMenuItem(String title) {
        super(title);
    }

    public PersistentJCheckBoxMenuItem(String title, boolean b) {
        super(title, b);
    }

    @Override
    public void updateUI() {
        super.updateUI();
        if (getUI() instanceof SynthCheckBoxMenuItemUI) {
            setUI(new SynthCheckBoxMenuItemUI() {
                @Override
                protected void doClick(MenuSelectionManager msm) {
                    menuItem.doClick(0);
                }
            });
        } else {
            setUI(new BasicCheckBoxMenuItemUI() {
                @Override
                protected void doClick(MenuSelectionManager msm) {
                    menuItem.doClick(0);
                }
            });
        }
    }
}