import java.awt.Color;
import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class MyFrame extends JFrame
{
    private JLabel aLabel;
    private GridBagLayout aLayout;
    private GridBagConstraints aConstraint;
    private JButton left;
    private JButton right;
    public MyFrame ()
    {
        MyWindowListener aWindowListener = new MyWindowListener ();
        addWindowListener(aWindowListener); // Calling method of super class.

	aConstraint = new GridBagConstraints();
        
	left = new JButton("LEFT: Press right button.");
	left.setBackground(Color.lightGray);	
	left.addActionListener(new ActionListener() 
	{
	    public void actionPerformed(ActionEvent e)  {
		JButton left = (JButton) e.getSource();		
		MyFrame aFrame = (MyFrame) left.getRootPane().getParent();  
		String title = aFrame.getTitle();
		aFrame.setTitle("Left pressed");
		right.setBackground(Color.green);
		left.setBackground(Color.lightGray);     
		timeDelay();          
           aFrame.setTitle(title);
	    }
	    });
	
	right = new JButton("RIGHT: Press left button");
	right.setBackground(Color.lightGray); 
	right.addActionListener(new ActionListener() 
	{
	    public void actionPerformed(ActionEvent e)  {
		JButton right = (JButton) e.getSource();		
		MyFrame aFrame = (MyFrame) right.getRootPane().getParent();  
		String title = aFrame.getTitle();
		JButton left = aFrame.getLeft();
		aFrame.setTitle("Right pressed");
		left.setBackground(Color.green);
		right.setBackground(Color.lightGray);     
		timeDelay();          
		aFrame.setTitle(title);
	    }
	    });

        aLabel = new JLabel("Simple label");
        aLayout = new GridBagLayout();
        setLayout(aLayout);     // Calling method of super class.
        addWidget(aLabel, 0, 0, 1, 1);
        addWidget(left, 1, 0, 1, 1);
        addWidget(right, 2, 0, 1, 1);
    }


    private void timeDelay () 
    {
        try 
	    {
		Thread.sleep(3000);
	    }
        catch (InterruptedException e)
	    {
		System.out.println("Problem with pasuing of the program");
	    }
    }

    public void addWidget (Component widget, int x, int y, int w, int h)
    {
        aConstraint.gridx = x;
        aConstraint.gridy = y;
        aConstraint.gridwidth = w;
        aConstraint.gridheight = h;
        aLayout.setConstraints (widget, aConstraint);
        add(widget);        // Calling method of super class.
    }

    public JButton getLeft() { return(left); }
    public JButton getRight() { return(right); }

}