import javax.swing.*;
import java.awt.Font;
import java.awt.BorderLayout;
import java.awt.event.*;

public class NgonApp
extends JFrame
{
    private NgonView view;
    private JTextField nField;
    
    public NgonApp()
    {
        super( "NgonApp" );
        setDefaultCloseOperation( EXIT_ON_CLOSE );
        view = new NgonView();
        getContentPane().add( view, BorderLayout.CENTER );
        
        JPanel nPanel = new JPanel();
        Font labelFont = new Font( "SansSerif", Font.BOLD, 18 );
        JLabel nLabel = new JLabel( "número de lados = " );
        nLabel.setFont( labelFont );
        nPanel.add( nLabel );
        nField = new JTextField( 5 );
        nField.setFont( labelFont );
        nField.addActionListener( new ActionListener()
        {
            public void actionPerformed( ActionEvent e )
            {
                int nSides;
                String nStr = nField.getText();
                try
                {
                    nSides = Integer.parseInt( nStr );
                    view.setSides( nSides );
                }
                catch ( NumberFormatException n )
                {
                    view.setSides( 0 );
                }
                nField.selectAll();
            }
        } );
        nPanel.add( nField );
        getContentPane().add( nPanel, BorderLayout.SOUTH );
        
        pack();
    }
    
    public static void main( String [] args )
    {
        NgonApp theApp = new NgonApp();
        theApp.setVisible( true );
    }
}