// ToolBarV.java
// Creating and using Vectors

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*; // For Vector class

public class ToolBarV extends Applet
                     implements ActionListener
{
  // Attributes
  String   slogan  = "Java, Java, Java!!!";
  Vector   toolBar = new Vector();

  public void init()
  {
    // 1. Toolbar Panel
    Panel p = new Panel();
    p.setLayout(new FlowLayout(FlowLayout.LEFT));
    p.setBackground(Color.lightGray);

    // 2. Create the toolBar Buttons
    String[] captions =
      { "Red", "Blue", "Green", "Yellow", "Black" };

    Button b;
    for (int i = 0; i < captions.length; i++)
    {
      b = new Button(captions[i]);
      b.addActionListener(this);
      p.add(b);
      toolBar.addElement(b);
    }

    // 3. Add the Panel to the top of the applet
    setLayout(new BorderLayout());
    add(p, "North");
  }

  public void actionPerformed(ActionEvent ae)
  {
    // 1. Retrieve source of click
    Object obj = ae.getSource();

    // 2. Match it with toolBar Button
    int clicked = toolBar.indexOf(obj);

    // 3. Take action based upon Button pressed
    switch (clicked)
    {
      case 0:   setBackground(Color.red);     break;
      case 1:   setBackground(Color.blue);    break;
      case 2:   setBackground(Color.green);   break;
      case 3:   setBackground(Color.yellow);  break;
      case 4:   setBackground(Color.black);   break;
    }
    repaint();
  }

  public void paint(Graphics g)
  {
    int height = getSize().height;
    int width  = getSize().width;

    g.setFont(new Font("Serif",
                  Font.BOLD + Font.ITALIC, 36));
    FontMetrics fm = g.getFontMetrics();
    int strWidth = fm.stringWidth(slogan);

    int x = width/2 - (strWidth/2);
    int y = height/2 + (fm.getHeight()/2);

    g.setColor(Color.white);
    g.drawString(slogan, x, y);
  }

}