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;
import java.util.Scanner;
import java.awt.Insets;

public class MyFrame extends JFrame
{
    private JButton left;
    private JButton right;
    private JLabel aLabel;
    private GridBagLayout aLayout;
    private GridBagConstraints aConstraint;

    public MyFrame ()
    {
        MyWindowListener aWindowListener = new MyWindowListener ();
        addWindowListener(aWindowListener); // Calling method of super class.
	aConstraint = new GridBagConstraints();
	Scanner in = new Scanner(System.in);
	System.out.print("Buffer size to pad the grid (non-negative only): ");
	int padding = in.nextInt();
	
        left = new JButton("L: Press me");
        right = new JButton("R: Press me");
        MyButtonListener aButtonListener = new MyButtonListener();
        left.addActionListener (aButtonListener);
        right.addActionListener (aButtonListener);
        aLabel = new JLabel("Simple label");
	aConstraint.insets = new Insets(padding,padding,padding,padding);
        aLayout = new GridBagLayout();
        setLayout(aLayout);     // Calling method of super class.
        addWidget(aLabel, 0, 0, 1, 1);
        addWidget(left, 0, 1, 1, 1);	
        addWidget(right, 1, 1, 1, 1);
    }

    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.
    }
}