Class SwingMenu

src/dorkbox/systemTray/ui/swing/SwingMenu.java:36–180

// this is a weird composite class, because it must be a Menu, but ALSO a Entry -- so it has both (and duplicate code)
public
class SwingMenu implements MenuPeer {
    private final SwingMenu parent;

    final JComponent _native;

    // called by the system tray constructors
    // This is NOT a copy constructor!
    @SuppressWarnings("IncompleteCopyConstructor")
    SwingMenu(final String trayName) {
        this.parent = null;

        TrayPopup trayPopup = new TrayPopup(trayName);
        if (SystemTray.SWING_UI != null) {
            trayPopup.setUI(SystemTray.SWING_UI.getMenuUI(trayPopup, null));
        }
        this._native = trayPopup;
    }

    // This is NOT a copy constructor!
    @SuppressWarnings("IncompleteCopyConstructor")
    public
    SwingMenu(final SwingMenu parent, final Menu entry, final int index) {
        this.parent = parent;

        JMenu jMenu = new JMenu();
        JPopupMenu popupMenu = jMenu.getPopupMenu(); // ensure the popup menu is created

        if (SystemTray.SWING_UI != null) {
            jMenu.setUI(SystemTray.SWING_UI.getItemUI(jMenu, entry));
            popupMenu.setUI(SystemTray.SWING_UI.getMenuUI(popupMenu, entry));
        }

        this._native = jMenu;
        parent._native.add(jMenu, index);
    }

    @Override
    public
    void add(final Menu parentMenu, final Entry entry, final int index) {
        // must always be called on the EDT
        SwingUtil.INSTANCE.invokeAndWaitQuietly(()->{
            // don't add this entry if it's already been added via another method. Because of threading via swing/gtk, entries can
            // POSSIBLY get added twice. Once via add() and once via bind().
            if (entry.hasPeer()) {
                return;
            }

            if (entry instanceof Menu) {
                SwingMenu swingMenu = new SwingMenu(SwingMenu.this, (Menu) entry, index);
                ((Menu) entry).bind(swingMenu, parentMenu, parentMenu.getImageResizeUtil());
            }
            else if (entry instanceof Separator) {
                SwingMenuItemSeparator item = new SwingMenuItemSeparator(SwingMenu.this, index);
                entry.bind(item, parentMenu, parentMenu.getImageResizeUtil());
            }
            else if (entry instanceof Checkbox) {
                SwingMenuItemCheckbox item = new SwingMenuItemCheckbox(SwingMenu.this, entry, index);