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

public class Example2 extends JFrame implements ActionListener {

    public static void main(String[] args) {
	JFrame frame = new Example2();   // Create a Window with "stuff" in it
	frame.setTitle("Example2");      // Give a title
	frame.setSize(100,1000);         // Give a default size of 100x100
	frame.setLocation(0,0);          // Place window in upper, left corner of screen
	frame.pack();                    // "Shrink wrap" window to fit its contents
	frame.setVisible(true);          // Show everything
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Kill program when window is closed
    }
   	
    private final int RIGHTSIZE = 10; // 10 "tiles" on the right
    private final int LEFTSIZE = 5;   // 5 buttons on the left
    private int DELAY = 500;
    private Container cp;
    private JPanel leftPanel;
    private JPanel rightPanel;
    private JButton[] leftButtons;
    private JButton[] rightButtons;
    private JLabel message;
    private Timer scheduler;
    private int pos = RIGHTSIZE - 1;

    public Example2() {
	setLayout();
	addButtons();
	addLabel();
	registerListeners();
    }

    private void setLayout() {
	// 1st level: Content Pane:
	cp = getContentPane();

	// Use flow layout to place panels:
	cp.setLayout(new FlowLayout(FlowLayout.LEFT,10,10));

	// 2nd level: place panels on left and right.
	// Inside each panel, use a grid to place more components
	// which will be on the "3rd level":
	leftPanel = new JPanel();
	leftPanel.setLayout(new GridLayout(LEFTSIZE+1,1)); // "+1" because for message
	cp.add(leftPanel);

	rightPanel = new JPanel();
	rightPanel.setLayout(new GridLayout(RIGHTSIZE,1));
	cp.add(rightPanel);
    }
    
    private void addButtons() {
	// Create buttons on left side:
	leftButtons = new JButton[LEFTSIZE];
	leftButtons[0]=new JButton("Start");
	leftButtons[1]=new JButton("Stop");
	leftButtons[2]=new JButton("Reset");
	leftButtons[3]=new JButton("Set Delay");
	leftButtons[4]=new JButton("Quit");
	
	// Add buttons to left side:
	for (int count=0;count<LEFTSIZE;count++) {
	    leftButtons[count].setBackground(Color.yellow);
	    leftPanel.add(leftButtons[count]);
	}

	// Create buttons on right side:
	rightButtons = new JButton[RIGHTSIZE];
	for (int count = 0; count < RIGHTSIZE; count++) {
	    rightButtons[count]=new JButton(""+count);
	    rightButtons[count].setBackground(Color.white);
	}

	// Add buttons to right side:
	for (int count=0;count<RIGHTSIZE;count++)
	    rightPanel.add(rightButtons[count]);

    }

    private void addLabel() {
	// Add Label
	message = new JLabel();
	message.setFont(new Font("Tahoma",Font.PLAIN,16));
	message.setText("Not Done!");
	message.setHorizontalAlignment(JLabel.CENTER);
	leftPanel.add(message);
    }

    private void registerListeners() {
	for (int i=0;i<LEFTSIZE;i++)
	    leftButtons[i].addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {

	// Start:
	if (e.getSource()==leftButtons[0]) {

	    // Do silly animation: from bottom to top, color a right button:
	    scheduler = new Timer(DELAY, new ActionListener() {
		    public void actionPerformed(ActionEvent e) {
			if (pos < 0) {
			    scheduler.stop();
			    message.setText("Done!");
			    return;
			}
			rightButtons[pos].setBackground(Color.blue);
			pos--;
		    }
		});
	    scheduler.start();
	}
	
	// Stop:
	else if(e.getSource()==leftButtons[1]) {
	    scheduler.stop();
	}

	// Reset: 
	else if(e.getSource()==leftButtons[2]) {
	    scheduler.stop(); // might still be running!
	    pos = RIGHTSIZE-1;
	    message.setText("Not Done!");
	    for (int count = 0; count < RIGHTSIZE; count++)
		rightButtons[count].setBackground(Color.white);
	}
	
	// Set Delay: 
	else if(e.getSource()==leftButtons[3]) {
	    scheduler.stop(); // might still be running!
	    DELAY = Integer.parseInt(JOptionPane.showInputDialog("Enter the delay in milliseconds:"));
	}
	
	// Quit:
	else if(e.getSource()==leftButtons[4]) {
	    scheduler.stop(); // might still be running!
	    switch(JOptionPane.showConfirmDialog(null,"Do you really wish to quit?",
						 "Alert!",JOptionPane.YES_NO_OPTION)) {
	    case JOptionPane.YES_OPTION: // quit program
		System.exit(0);
		break;
	    case JOptionPane.NO_OPTION:  // continue
		break;
	    default:                     // unknown
		JOptionPane.showMessageDialog(null,"Something weird just happened!");
		
	    } // End Switch
	}
	
	// Something weird:
	else {
	    System.err.println("Something horrible has happened!");
	    System.exit(0);
	}
    } // Method ActionPerformed

} // Class Example2