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CheckboxTree is a Java Swing component providing a tree-like widget with checkboxes in each node. Checkboxes can toggle between the checked and unchecked state. Disabled and greyed checkboxes are also supported. The CheckboxTree API design is inspired by the JTree interface.

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/*
 * Copyright 2007-2022 Enrico Boldrini, Lorenzo Bigagli This file is part of
 * CheckboxTree. CheckboxTree is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version. CheckboxTree is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details. You should have received a copy of the GNU
 * General Public License along with CheckboxTree; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */
package eu.essilab.lablib.checkboxtree.examples;


import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.plaf.metal.DefaultMetalTheme;
import javax.swing.plaf.metal.MetalLookAndFeel;
import javax.swing.plaf.metal.OceanTheme;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

import eu.essilab.lablib.checkboxtree.CheckboxTree;
import eu.essilab.lablib.checkboxtree.TreeCheckingModel;

/**
 * An example showcase for the various look and feels. There are issues with
 * dynamically changing the L&F of a CheckboxTree.
 * 
 * @author bigagli
 * @author boldrini
 */
public class LookAndFeelTree extends JFrame implements ActionListener {

    private CheckboxTree checkboxTree = null;

    private javax.swing.JPanel jContentPane = null;

    public static void main(String[] args) {
	// Schedule a job for the event dispatcher thread:
	// creating and showing this application's GUI.
	javax.swing.SwingUtilities.invokeLater(new Runnable() {
	    public void run() {
		for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
		    System.out.println(info);
		}
		System.out.println("Cross-platform L&F: " + UIManager.getCrossPlatformLookAndFeelClassName());
		createAndShowGUI();
	    }
	});
    }

    /**
     * Create the GUI and show it. For thread safety, this method should be
     * invoked from the event dispatch thread.
     */
    private static void createAndShowGUI() {
	// Set the look and feel
	try {
	    String lafName = "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel";
	    // String lafName = UIManager.getSystemLookAndFeelClassName();
	    System.out.println("Setting the L&F to " + lafName);
	    UIManager.setLookAndFeel(lafName);
	} catch (ClassNotFoundException e) {
	    e.printStackTrace();
	} catch (InstantiationException e) {
	    e.printStackTrace();
	} catch (IllegalAccessException e) {
	    e.printStackTrace();
	} catch (UnsupportedLookAndFeelException e) {
	    e.printStackTrace();
	}
	// Make sure we have nice window decorations
	// JFrame.setDefaultLookAndFeelDecorated(true);
	// Create and set up the window
	JFrame frame = new LookAndFeelTree();
	// Display the window
	frame.pack();
	frame.setVisible(true);
    }

    /**
     * Creates the frame.
     */
    public LookAndFeelTree() {
	this.setContentPane(getJContentPane());
	this.setTitle("CheckboxTree");
	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	this.setJMenuBar(getLAFMenuBar());
    }

    /**
     * This method initializes jContentPane
     * 
     * @return javax.swing.JPanel
     */
    private JPanel getJContentPane() {
	if (this.jContentPane == null) {
	    this.jContentPane = new JPanel();
	    this.jContentPane.setLayout(new BorderLayout());
	    this.jContentPane.add(getCheckboxTree(), BorderLayout.CENTER);
	}
	return this.jContentPane;
    }

    /**
     * This method initializes the CheckboxTree
     * 
     * @return eu.essilab.lablib.checkboxtree.CheckboxTree
     */
    private JScrollPane getCheckboxTree() {
	if (this.checkboxTree == null) {
	    this.checkboxTree = new CheckboxTree();
	    this.checkboxTree.getCheckingModel().setCheckingMode(TreeCheckingModel.CheckingMode.PROPAGATE);
	    DefaultMutableTreeNode root = (DefaultMutableTreeNode) this.checkboxTree.getModel().getRoot();

	    DefaultMutableTreeNode ravioli = (DefaultMutableTreeNode) root.getChildAt(2).getChildAt(2);// ravioli;

	    ravioli.add(new DefaultMutableTreeNode("al tartufo"));
	    ravioli.add(new DefaultMutableTreeNode("alla salvia"));
	    for (int i = 2; i < 10; i++) {
		ravioli.add(new DefaultMutableTreeNode("ai " + i + " formaggi"));
	    }
	    ((DefaultTreeModel) this.checkboxTree.getModel()).nodeStructureChanged(root);
	    this.checkboxTree.addCheckingPath(new TreePath(ravioli.getPath()));
	    checkboxTree.expandAll();
	}
	return new JScrollPane(this.checkboxTree);
    }

    private JMenuBar getLAFMenuBar() {
	JMenuBar retVal = new JMenuBar();
	// Define and add the drop down menu to the menubar
	JMenu lafMenu = new JMenu("Look&Feel");
	retVal.add(lafMenu);

	// Create and add Radio Buttons as simple menu items to one of the drop
	// down menu
	JRadioButtonMenuItem radioAction3 = new JRadioButtonMenuItem("System");
	radioAction3.setSelected(true);
	JRadioButtonMenuItem radioAction1 = new JRadioButtonMenuItem("Metal-default-theme");
	JRadioButtonMenuItem radioAction2 = new JRadioButtonMenuItem("Metal-ocean-theme");
	JRadioButtonMenuItem radioAction4 = new JRadioButtonMenuItem("CDE/Motif");
	JRadioButtonMenuItem radioAction5 = new JRadioButtonMenuItem("GTK");
	JRadioButtonMenuItem radioAction6 = new JRadioButtonMenuItem("Nimbus");
	// Create a ButtonGroup and add both radio Button to it. Only one radio
	// button in a ButtonGroup can be selected at a time.
	ButtonGroup bg = new ButtonGroup();
	bg.add(radioAction1);
	bg.add(radioAction2);
	bg.add(radioAction3);
	bg.add(radioAction4);
	bg.add(radioAction5);
	bg.add(radioAction6);
	lafMenu.add(radioAction1);
	lafMenu.add(radioAction2);
	lafMenu.add(radioAction3);
	lafMenu.add(radioAction4);
	lafMenu.add(radioAction5);
	lafMenu.add(radioAction6);
	// Add a listener to the New menu item. actionPerformed() method will
	// invoked, if user triggered this menu item
	radioAction1.addActionListener(this);
	radioAction2.addActionListener(this);
	radioAction3.addActionListener(this);
	radioAction4.addActionListener(this);
	radioAction5.addActionListener(this);
	radioAction6.addActionListener(this);
	return retVal;
    }

    public void actionPerformed(ActionEvent action) {
	String actionName = action.getActionCommand();
	String lafName = null;
	if (actionName.equals("Metal-default-theme")) {
	    lafName = "javax.swing.plaf.metal.MetalLookAndFeel";
	    MetalLookAndFeel.setCurrentTheme(new DefaultMetalTheme());
	} else if (actionName.equals("Metal-ocean-theme")) {
	    lafName = "javax.swing.plaf.metal.MetalLookAndFeel";
	    MetalLookAndFeel.setCurrentTheme(new OceanTheme());
	} else if (actionName.equals("System")) {
	    lafName = UIManager.getSystemLookAndFeelClassName();
	} else if (actionName.equals("CDE/Motif")) {
	    lafName = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
	} else if (actionName.equals("GTK")) {
	    lafName = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
	} else if (actionName.equals("Nimbus")) {
	    lafName = "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel";
	}
	try {
	    System.out.println("Setting the L&F to " + lafName);
	    UIManager.setLookAndFeel(lafName);
	    SwingUtilities.updateComponentTreeUI(this);
	} catch (ClassNotFoundException e) {
	    System.err.println("Couldn't find class for specified look and feel: " + lafName);
	    System.err.println("Did you include the L&F library in the class path?");
	    System.err.println("Using the default look and feel.");
	} catch (UnsupportedLookAndFeelException e) {
	    System.err.println("Can't use the specified look and feel (" + lafName + ") on this platform.");
	    System.err.println("Using the default look and feel.");
	} catch (Exception e) {
	    System.err.println("Couldn't get specified look and feel (" + lafName + "), for some reason.");
	    System.err.println("Using the default look and feel.");
	    e.printStackTrace();
	}
    }

}




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