Class SwingMenuItem

src/dorkbox/systemTray/ui/swing/SwingMenuItem.java:34–170

import dorkbox.util.SwingUtil;

class SwingMenuItem implements MenuItemPeer {
    // necessary to have the correct scaling + padding for the menu entries.
    static ImageIcon transparentIcon = null;

    /**
     * This should ONLY be called by _SwingTray!
     *
     * @param menuImageSize this is the largest size of an image used in a JMenuItem, before the size of the JMenuItem is forced to be larger
     */
    static
    void createTransparentIcon(int menuImageSize, ImageResizeUtil imageResizeUtil) {
        if (transparentIcon == null) {
            try {
                JMenuItem jMenuItem = new JMenuItem();

                // do the same modifications that would also happen (if specified) for the actual displayed menu items
                if (SystemTray.SWING_UI != null) {
                    jMenuItem.setUI(SystemTray.SWING_UI.getItemUI(jMenuItem, null));
                }

                transparentIcon = new ImageIcon(imageResizeUtil.getTransparentImage(menuImageSize)
                                                               .getAbsolutePath());
            } catch (Exception e) {
                SystemTray.logger.error("Error creating transparent image.", e);
            }
        }
    }


    protected final SwingMenu parent;
    protected final JMenuItem _native = new JMenuItem();

    protected volatile ActionListener callback;


    // this is ALWAYS called on the EDT.
    SwingMenuItem(final SwingMenu parent, final Entry entry, final int index) {
        this.parent = parent;

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

        _native.setHorizontalAlignment(SwingConstants.LEFT);
        parent._native.add(_native, index);

        _native.setIcon(transparentIcon);
    }

    @Override
    public
    void setImage(final MenuItem menuItem) {
        SwingUtil.INSTANCE.invokeLater(()->{
            File imageFile = menuItem.getImage();
            if (imageFile != null) {
                ImageIcon origIcon = new ImageIcon(imageFile.getAbsolutePath());
                _native.setIcon(origIcon);
            }