/**Copyright (c)  Louis, D., Müller, P.: "Java. Der umfassende Programmierkurs" 
 * O`Reilly Verlag, Köln, 2014
 * FraktalDemo.java - Fraktalberechnung, S. 801
*/

import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class FraktalFenster extends JFrame implements ActionListener {
	private static final long serialVersionUID = 1L;
	private JPanel contentPane;
	private JPanel canvas;
	private BorderLayout borderLayout = new BorderLayout();
	private FraktalThread fraktal = null;
	
	// Konstruktor
	public FraktalFenster() {
		contentPane = (JPanel) this.getContentPane();
		contentPane.setLayout(borderLayout);
		setSize(new Dimension(400, 400));
		setResizable(false);
		setTitle("Fraktal-Demo-Thread");
		
		JPanel tmp = new JPanel();
		JButton start = new JButton("Start");
		JButton stop = new JButton("Stop");
		start.addActionListener(this);
		stop.addActionListener(this);
		tmp.add(start);
		tmp.add(stop);
		contentPane.add(tmp, BorderLayout.SOUTH);
		
		canvas = new JPanel();
		canvas.setSize(400, 300);
		canvas.setBackground(Color.BLACK);
		contentPane.add(canvas, BorderLayout.CENTER);
		
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public void actionPerformed(ActionEvent e) {
		String cmd = e.getActionCommand();
		
		if(cmd.equals("Start") == true && (fraktal == null)) {
			fraktal = new FraktalThread(canvas);
			fraktal.start();
		}
		
		if(cmd.equals("Stop") == true && (fraktal != null)) {
			fraktal.stoppen();
			fraktal = null;
		}
	}
}