LookAndFeelSelector.java

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package com.arcle.rmt.j2se.swing.ui;

import javax.swing.*;
import java.lang.ref.SoftReference;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.Component;
import java.awt.Window;

public final class LookAndFeelSelector {
    private LookAndFeelSelector() {
    }

    //-----------------------------------------------------------------------
    // Accessor Methods

    public static final LookAndFeelSelector getInstance() {
        LookAndFeelSelector lf = (LookAndFeelSelector) _instance.get();
        if (lf == null) {
            lf = new LookAndFeelSelector();
            _instance = new SoftReference(lf);
        }
        return lf;
    }

    public JMenu getSelectorMenu() {
        if (_selectorMenu == null) {
            _selectorMenu = createSelectorMenu();
        }
        return _selectorMenu;
    }


    //-----------------------------------------------------------------------
    // Factory methods

    protected JMenu createSelectorMenu() {
        JMenu menu = new JMenu("Look and Feel");
        menu.setMnemonic(KeyEvent.VK_L);

        LookAndFeel curLF = UIManager.getLookAndFeel();
        String curLFClass = curLF != null ? curLF.getClass().getName() : null;

        ButtonGroup group = new ButtonGroup();
        UIManager.LookAndFeelInfo[] lfInfo = UIManager.getInstalledLookAndFeels();
        for (int i=0; i<lfInfo.length; i++) {
            UIManager.LookAndFeelInfo curInfo = lfInfo[i];
            JRadioButtonMenuItem item = new JRadioButtonMenuItem(
                createLookAndFeelSelectAction(curInfo));
            group.add(item);
            if (curInfo.getClassName().equals(curLFClass)) {
                group.setSelected(item.getModel(), true);

            }
            menu.add(item);
        }
        return menu;
    }

    protected Action createLookAndFeelSelectAction(UIManager.LookAndFeelInfo lf) {
        return new LookAndFeelSelectAction(lf);
    }


    //-----------------------------------------------------------------------
    // Member variables

    private JMenu _selectorMenu = null;

    private static SoftReference _instance = new SoftReference(null);

    //-----------------------------------------------------------------------
    // InnerClasses


    protected static class LookAndFeelSelectAction extends AbstractAction {
        public LookAndFeelSelectAction(UIManager.LookAndFeelInfo lf) {
            theLF = lf;
            putValue(NAME, theLF.getName());
            //putValue(SHORT_DESCRIPTION, theLF.getDescription());
            //setEnabled(theLF.isSupportedLookAndFeel());
        }

        public void actionPerformed(ActionEvent e) {
            try {
                UIManager.setLookAndFeel(theLF.getClassName());
                /*
                @todo update all swing components
                @note
                Failed attempts to get the topmost Swing component to update:
                    - SwingUtilities.getRoot(c)
                    - SwingUtilities.getRootPane(c);
                    - SwingUtilities.windowForComponent(c);
                    - SwingUtilities.getWindowAncestor(c);
                They all returned null.
                */

            } catch(Exception ex) {
                showException(e.getSource(), ex);
            }
        }

        protected void showException(Object source, Exception e) {
            Component c = source instanceof Component ?
                            (Component) source : null;
            MoreSwingUtilities.showException(c, e);
        }

        private UIManager.LookAndFeelInfo theLF;
    }
}

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