WhiteboardUserpublic class WhiteboardUser extends RMICollaboratorImpl implements MouseMotionListener, MouseListener| Source code from "Java Distributed Computing", by Jim Farley.
Class: WhiteboardUser
Example: 10-2
Description: A collaborator in an RMI-based shared whiteboard. |
(Omit source code)
| Fields Summary |
|---|
| protected Hashtable | lastPts | | protected Component | whiteboard | | protected Image | buffer |
| Constructors Summary |
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public WhiteboardUser(String name, Color color, String host, String mname)
super(name, host, mname);
getIdentity().setProperty("color", color);
buildUI();
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| Methods Summary |
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| protected void | buildUI()
Frame f = new Frame();
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
f.setLayout(gridbag);
f.addNotify();
c.fill = GridBagConstraints.BOTH;
c.gridwidth = GridBagConstraints.REMAINDER;
Canvas canvas1 = new java.awt.Canvas();
canvas1.setSize(240,180);
canvas1.setBackground(Color.white);
gridbag.setConstraints(canvas1, c);
f.add(canvas1);
String name = null;
try {
name = getIdentity().getName();
}
catch (Exception e) {
name = "unknown";
}
Label label1 = new java.awt.Label("Your name: " + name);
label1.setSize(100,30);
gridbag.setConstraints(label1, c);
f.add(label1);
f.setSize(240,210);
f.show();
whiteboard = canvas1;
whiteboard.addMouseListener(this);
whiteboard.addMouseMotionListener(this);
buffer = whiteboard.createImage(f.getSize().width,
f.getSize().height);
| | public void | mouseClicked(java.awt.event.MouseEvent ev)
| | public void | mouseDragged(java.awt.event.MouseEvent ev)
//System.out.println("Got mouse drag");
Point evPt = ev.getPoint();
try {
broadcast("drag", evPt);
}
catch (Exception e) {
//System.out.println("exception");
}
//System.out.println("Finished drag.");
| | public void | mouseEntered(java.awt.event.MouseEvent ev)
| | public void | mouseExited(java.awt.event.MouseEvent ev)
| | public void | mouseMoved(java.awt.event.MouseEvent ev)
| | public void | mousePressed(java.awt.event.MouseEvent ev)
//System.out.println("Got mouse pressed");
Point evPt = ev.getPoint();
try {
broadcast("start", evPt);
}
catch (Exception e) {}
| | public void | mouseReleased(java.awt.event.MouseEvent ev)
Point evPt = ev.getPoint();
try {
broadcast("end", evPt);
}
catch (Exception e) {}
| | protected void | nextLine(java.lang.String agent, java.awt.Point pt, java.awt.Color c)
Graphics g = buffer.getGraphics();
if (c != null)
g.setColor(c);
Point lastPt = (Point)lastPts.get(agent);
g.drawLine(lastPt.x, lastPt.y, pt.x, pt.y);
whiteboard.getGraphics().drawImage(buffer, 0, 0, whiteboard);
| | public boolean | notify(java.lang.String tag, java.lang.Object data, Identity src)
Color agentColor = null;
try {
agentColor = (Color)src.getProperty("color");
}
catch (Exception exc) {}
if (tag.compareTo("start") == 0) {
lastPts.put(src.getName(), data);
}
else if (tag.compareTo("drag") == 0) {
nextLine(src.getName(), (Point)data, agentColor);
lastPts.put(src.getName(), data);
}
else if (tag.compareTo("end") == 0) {
nextLine(src.getName(), (Point)data, agentColor);
lastPts.remove(src.getName());
}
return true;
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