package Lect39GUIs;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class SwingExampleManualLayout {
	private final static int WIDTH = 500, HEIGHT = 400;
	
	public SwingExampleManualLayout() {
		JFrame frame = buildFrame();
		buildGUI(frame);
		displayFrame(frame);
	}
	
	public JFrame buildFrame() {
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		} catch (Exception e) {}
		
		// Create a top-level window to put the picture in
		JFrame frame;
		frame = new JFrame("Swing Example");
		frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		
		return frame;
	}
	
	public void buildGUI(JFrame frame) {
		JPanel panel = new JPanel();
		panel.setPreferredSize(new Dimension(WIDTH, HEIGHT));
		panel.setBackground(Color.WHITE);
		panel.setLayout(null);
	
		JButton button = new JButton("Do it");
		button.setBounds(50, 50, 100, 20);
		panel.add(button);
		
		JLabel label = new JLabel();
		label.setBounds(50, 75, 100, 20);
		panel.add(label);
		
		JTextArea textArea = new JTextArea();
		textArea.setLineWrap(true);
		textArea.setBorder(new EtchedBorder());
		textArea.setBounds(50, 100, 100, 200);
		panel.add(textArea);

		button.addActionListener(new DoIt(label));

		frame.setContentPane(panel);
	}
	
	public void displayFrame(JFrame frame) {
		frame.setLocation(100, 100);
		frame.pack();
		frame.show();		
	}
	
	static public void main(String[] args) {
		new SwingExampleManualLayout();
		// Note that Swing starts a new thread, so the program continues
		// even though this thread exits
		System.out.println("This line executes and main exits, but program keeps running");
	}
}

class DoIt implements ActionListener {
	private JLabel label;
	private int actionCount = 0;
	
	public DoIt(JLabel label) {
		this.label = label;
	}
	
	public void actionPerformed(ActionEvent e) {
		label.setText("It: " + actionCount++);
	}	
}