How to add ChangeListener to JToggleButton?

Here is how to add ChangeListener to JToggleButton. In this example, we are going to make the JPanel semi transparent when the JToggleButton is selected and fully transparent when it is deselected. You will also learn (if you haven't), how to set background image in JFrame in this post. Here is the full code, with helpful commentaries.

import javax.swing.*;

import java.awt.*;

import javax.swing.event.*;

class ChangeListenerForJToggleButton extends JFrame

{

JToggleButton jt;

JPanel jp;

GridBagLayout g=new GridBagLayout();



	public ChangeListenerForJToggleButton()

	{

		createAndShowGUI();

	}

	

	private void createAndShowGUI()

	{

		// Set frame properties

		setTitle("ChangeListener Demo");

		

		// Set a background image

		setContentPane(new JLabel(new ImageIcon("E:\\Wallpapers\\abstract triangle.jpg")));

		setLayout(g);

		setDefaultCloseOperation(EXIT_ON_CLOSE);

		

		// Create a JPanel

		jp=new JPanel();

		

		// Set gridbaglayout

		jp.setLayout(g);

		

		// Make it quite big

		jp.setPreferredSize(new Dimension(250,250));

		

		// Create JToggleButton

		jt=new JToggleButton("Transparent");

		jt.addChangeListener(new ChangeListener(){

			public void stateChanged(ChangeEvent ce)

			{

				// Set a background, semi transprent if selected

				// fully transparent if not selected

				jp.setBackground(new Color(0,0,0,jt.isSelected()?40:0));

				

				// update the ui, so that you can see the effect without

				// updating the jframe manually

				SwingUtilities.updateComponentTreeUI(getRootPane());

			}

		});

		

		// Add JToggleButton to jp

		jp.add(jt);

		

		// Add jp to jframe

		add(jp);

		

		setSize(400,400);

		setVisible(true);

	}

	

	public static void main(String args[])

	{

		SwingUtilities.invokeLater(new Runnable(){

			public void run()

			{

				new ChangeListenerForJToggleButton();

			}

		});

	}

}

If you like this post, feel free to share it. You might also like, using serialization on JToggleButton