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/* LightedPushButton.java */
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.beans.*;
public class LightedPushButton
extends Canvas
implements Serializable
{
//---Instanzvariablen----------------------------------------
protected Color linecolor;
protected Color framecolor;
protected Color lightoncolor;
protected Color lightoffcolor;
protected boolean lighton;
transient protected PropertyChangeSupport pchglisteners;
transient protected VetoableChangeSupport vchglisteners;
//---Methoden------------------------------------------------
public LightedPushButton()
{
linecolor = Color.black;
framecolor = Color.darkGray;
lightoncolor = Color.red;
lightoffcolor = new Color(127, 0, 0); //dark red
lighton = false;
initTransientState();
}
//---Zustandsumschaltung Licht an/aus---
public void setLightOn(boolean on)
throws PropertyVetoException
{
boolean oldvalue = this.lighton;
vchglisteners.fireVetoableChange("lighton", oldvalue, on);
this.lighton = on;
if (oldvalue != on) {
repaint();
}
pchglisteners.firePropertyChange("lighton", oldvalue, on);
}
public boolean getLightOn()
{
return this.lighton;
}
//---Verwaltung der PropertyChangeListener---
public void addPropertyChangeListener(PropertyChangeListener l)
{
pchglisteners.addPropertyChangeListener(l);
}
public void removePropertyChangeListener(PropertyChangeListener l)
{
pchglisteners.removePropertyChangeListener(l);
}
//---Verwaltung der VetoableChangeListener---
public void addVetoableChangeListener(VetoableChangeListener l)
{
vchglisteners.addVetoableChangeListener(l);
}
public void removeVetoableChangeListener(VetoableChangeListener l)
{
vchglisteners.removeVetoableChangeListener(l);
}
//---Implementierung der Oberfl�che---
public void paint(Graphics g)
{
int width = getSize().width;
int height = getSize().height;
//Rahmen
g.setColor(framecolor);
g.fillOval(0, 0, width, height);
//Beleuchtung
g.setColor(lighton ? lightoncolor : lightoffcolor);
g.fillOval(4, 4, width - 8, height - 8);
//Konturlinien
g.setColor(linecolor);
g.drawOval(0, 0, width - 1, height - 1);
g.drawOval(3, 3, width - 7, height - 7);
}
public Dimension getPreferredSize()
{
return new Dimension(32, 32);
}
public Dimension getMinimumSize()
{
return new Dimension(16, 16);
}
//---Private Klassen---------------------------------------
/**
* Initialisierung der nicht-persistenten Instanzvariablen.
*/
private void initTransientState()
{
pchglisteners = new PropertyChangeSupport(this);
vchglisteners = new VetoableChangeSupport(this);
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)
{
try {
setLightOn(!getLightOn());
} catch (PropertyVetoException e) {
//no change if vetoed
}
}
}
}
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