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/* VetoSwitch.java */
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.beans.*;
public class VetoSwitch
extends Canvas
implements Serializable, VetoableChangeListener
{
//---Instanzvariablen----------------------------------------
protected Color linecolor;
protected boolean vetoallchanges;
//---Methoden------------------------------------------------
public VetoSwitch()
{
this.linecolor = Color.black;
this.vetoallchanges = false;
initTransientState();
}
//---Konturenfarbe---
public void setLineColor(Color color)
{
this.linecolor = color;
}
public Color getLineColor()
{
return this.linecolor;
}
//---Zustandsumschaltung Licht an/aus---
public void setVetoAllChanges(boolean b)
{
if (this.vetoallchanges != b) {
this.vetoallchanges = b;
repaint();
}
}
public boolean getVetoAllChanges()
{
return this.vetoallchanges;
}
//---Veto---
public void vetoableChange(PropertyChangeEvent e)
throws PropertyVetoException
{
if (this.vetoallchanges) {
throw new PropertyVetoException("!!!VETO!!!", e);
}
}
//---Implementierung der Oberfl�che---
public void paint(Graphics g)
{
int width = getSize().width;
int height = getSize().height;
g.setColor(linecolor);
g.drawRect(0, 0, width - 1, height - 1);
g.drawLine(width * 1 / 8, height / 2, width * 3 / 8, height / 2);
g.drawLine(width * 5 / 8, height / 2, width * 7 / 8, height / 2);
g.fillRect(width * 3 / 8 - 1, height / 2 - 1, 3, 3);
g.fillRect(width * 5 / 8 - 1, height / 2 - 1, 3, 3);
if (this.vetoallchanges) {
//draw open connection
g.drawLine(width * 3 / 8, height / 2, width * 5 / 8, height / 4);
} else {
//draw short-cutted connection
g.drawLine(width * 3 / 8, height / 2, width * 5 / 8, height / 2);
}
}
public Dimension getPreferredSize()
{
return new Dimension(60, 20);
}
public Dimension getMinimumSize()
{
return new Dimension(28, 10);
}
//---Private Klassen----------------------------------------
private void initTransientState()
{
addMouseListener(new MouseClickAdapter());
}
/**
* Wird �berlagert, um nach dem Deserialisieren den transienten
* Zustand zu initialisieren.
*/
private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException
{
stream.defaultReadObject();
initTransientState();
}
//---Lokale Klassen----------------------------------------
class MouseClickAdapter
extends MouseAdapter
{
public void mouseClicked(MouseEvent event)
{
setVetoAllChanges(!getVetoAllChanges());
}
}
}
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