aboutdialog.java

汽车销售系统汽车销售系统汽车销售系统汽车销售系统汽车销售系统汽车销售系统

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
 * A simple about dialog.
 * @
 *
 * PUBLIC FEATURES:
 * // Constructors
 *    public AboutDialog(JFrame parent, String title, boolean modal)
 *
 * // Methods
 *    public void actionPerformed(ActionEvent ev)
 *    public void closing()
 *    public void showAbout()
 *    public int addNewCar(Car c)
 *    public void closing()
 *
 * COLLABORATORS:
 *
 * @version 1.0, 16 Oct 2004
 * @author Adam Black
 */
public class AboutDialog extends JDialog implements ActionListener
{
	private JButton okButton = new JButton("OK");
	private JPanel buttonPanel = new JPanel();
	private WindowCloser closer = new WindowCloser();

	/**
	 * @param parent a parent JFrame to place the dialog on top of
	 * @param title title of the about dialog
	 * @param modal modal means focus cannot be taken away from the dialog, non-modal means it can.
	 */
	public AboutDialog(JFrame parent, String title, boolean modal)
	{
		super(parent, title, modal);
		Container c = getContentPane();

		setSize(480, 130);
		setLocationRelativeTo(parent);
		addWindowListener(closer);
		c.setLayout(new GridLayout(3, 1));
		setTitle(title);
		buttonPanel.add(okButton);
		c.add(new JLabel("Cars Sales System by Adam Black", JLabel.CENTER));
		c.add(new JLabel("SD2, Assignment 2", JLabel.CENTER));
		c.add(buttonPanel);
		okButton.addActionListener(this);
	}

	/**
	 * ok button clicked so call the closing method
	 *
	 * @param ev ActionEvent object
	 */
	public void actionPerformed(ActionEvent ev)
	{
		if (ev.getSource() == okButton)
			closing();
	}

	/**
	 * Hides for from focus, so it can be made visible without needing a new instance
	 */
	public void closing()
	{
		setVisible(false);
	}

	/**
	 * default method to show about dialog. This ensures it is centred on the parent form. Please
	 * ensure you do not use the setVisible() method directly, use this one instead.
	 */
	public void showAbout()
	{
		// center the dialog relative to the parent frame.
		setLocationRelativeTo(getParent());
		setVisible(true);
	}

	class WindowCloser extends WindowAdapter
	{
		/**
		 * calls the car sales system's main closing event
		 *
		 * @param ev WindowEvent object
		 */
		public void windowClosing(WindowEvent ev)
		{
			closing();
		}
	}
}