Applets

Mouse sensitive applet

 1 import java.applet.Applet;
 2 import java.awt.*;
 3 import com.braju.applet.*;
 4 import com.braju.format.*;
 5 
 6 public class MouseApplet extends Applet implements DoneListener {
 7   private LoaderPanel loaderPnl;
 8   private Panel mainPnl;
 9 
10   String theMessage;
11   Button theButton;
12 
13   int messageX, messageY;
14   int colorIndex = -1;
15 
16   static Color[] someColors = {
17      Color.black, Color.red, Color.green, Color.blue, Color.magenta };
18      
19   public void init() {
20     setBackground(Color.white);
21     // The loader that is shown initially...
22     loaderPnl = new LoaderPanel();
23     loaderPnl.addDoneListener(this);
24     add(loaderPnl);
25     // The main panel that will be shown after loading...
26     mainPnl = new Panel();
27     mainPnl.hide();
28     mainPnl.setBackground(Color.white);
29     theButton = new Button("Change Color");
30     mainPnl.add(theButton);
31     add(mainPnl);
32   }
33 
34   public void done(DoneEvent e) {
35     loaderPnl.hide();
36     mainPnl.show();
37     messageX = size().width/2;
38     messageY = size().height/2;
39     colorIndex = 0;
40     validate();
41     repaint();
42   }
43 
44   public void paint(Graphics graphics) {
45     if (colorIndex == -1) return;
46 
47     // Set the text color.
48     graphics.setColor(currentColor());
49 
50     theMessage = Format.sprintf("[%03d,%03d] [%#02.2x,%#02x]", 
51        new Parameters(messageX).add(messageY)
52           .add((short)messageX).add((short)messageY));
53 
54     graphics.drawString(theMessage, messageX,messageY);
55   } // paint
56 
57   public boolean mouseDrag(Event e, int x, int y) {
58     messageX = x; 
59     messageY = y;
60 
61     // Repaing everything in the window.
62     repaint();
63 
64     return true;
65   } // mouseDrag
66 
67 
68   public boolean action(Event e, Object arg) {
69     // If the button was clicked, change color...
70     if (e.target == theButton) {
71       changeColor();
72       return true;
73     }
74 
75     return false;
76   } // mouseMoved
77 
78   synchronized private void changeColor() {
79     if (++colorIndex == someColors.length)
80       colorIndex = 0;
81 
82     theButton.setForeground(currentColor());
83     repaint();
84   } // changeColor
85 
86   synchronized private Color currentColor() {
87     return someColors[colorIndex];
88   } // currentColor
89 }