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Version 6 of the Clay Shell program is like Version 5 except that the buttons are alive! Quite a bit of lecture time was devoted to describing the event generating/handling model in Java.
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java -jar ".../Clay6.jar" -w 400 -h 200
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package clay6;
import java.awt.*;
import java.awt.event.*;
public class Main {
<<<Just like in the previous version!>>>
}
class ClayFrame extends Frame implements ActionListener {
public ClayFrame(String title, Color color, Dimension size) {
super(title);
establishColors();
setBackground(color);
setSize(size.width,size.height);
addComponents();
setVisible(true);
addWindowListener(new CloseWindow());
}
private Color backgroundColor;
private Color hilightColor;
private Color lolightColor;
private Button nb;
private Button sb;
private Button eb;
private Button wb;
private Button cb;
private Button theButton; // selection
private void establishColors()
{
Color purplerose = new Color(210,180,200);
hilightColor = purplerose;
lolightColor = Color.white;
}
private void addComponents()
{
// establish the layout manager
setLayout(new BorderLayout());
// create five buttons
nb = new Button("North");
sb = new Button("South");
eb = new Button("East");
wb = new Button("West");
cb = new Button("Center");
// set backgrounds of buttons to white
nb.setBackground(lolightColor);
sb.setBackground(lolightColor);
eb.setBackground(lolightColor);
wb.setBackground(lolightColor);
cb.setBackground(lolightColor);
// add action listeners
nb.addActionListener(this);
sb.addActionListener(this);
eb.addActionListener(this);
wb.addActionListener(this);
cb.addActionListener(this);
// add the buttons to the frame
add(nb,BorderLayout.NORTH);
add(sb,BorderLayout.SOUTH);
add(cb,BorderLayout.CENTER);
add(eb,BorderLayout.EAST);
add(wb,BorderLayout.WEST);
}
public void actionPerformed(ActionEvent event)
{
Object source = event.getSource();
if ( source instanceof Button ) {
theButton = (Button)source;
// color the buttons
nb.setBackground(lolightColor);
sb.setBackground(lolightColor);
wb.setBackground(lolightColor);
eb.setBackground(lolightColor);
cb.setBackground(lolightColor);
theButton.setBackground(hilightColor);
}
}
class CloseWindow extends WindowAdapter {
<<<Just like in the previous version!>>>
}
}