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/* ButtonPanel.java */
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
public class ButtonPanel
extends Panel
implements Serializable, ItemListener
{
//---Instanzvariablen------------------------------------
protected CheckboxGroup cbg;
protected Checkbox[] cb;
transient protected PropertyChangeSupport pcs;
//---Methoden--------------------------------------------
public ButtonPanel()
{
cbg = new CheckboxGroup();
cb = new Checkbox[0];
initTransientState();
}
//---Anzahl der RadioButtons-----------------------------
public void setButtonCnt(int cnt)
{
if (cnt != cb.length) {
int oldvalue = cb.length;
//Bisherige Buttons entfernen
if (cb.length > 0) {
removeAll();
}
cb = new Checkbox[cnt];
setLayout(new GridLayout(cnt, 1));
for (int i = 0; i < cnt; ++i) {
cb[i] = new Checkbox(
"RadioButton " + i,
cbg,
(i == 0 ? true : false)
);
cb[i].addItemListener(this);
add(cb[i]);
}
//PropertyChangeEvents senden
pcs.firePropertyChange("buttonCnt", oldvalue, cnt);
if (cnt > 0) {
setSelected(0);
}
//Neu layouten
setSize(getPreferredSize());
invalidate();
doLayout();
Container owner = getParent();
if (owner != null) {
owner.invalidate();
owner.doLayout();
}
}
}
public int getButtonCnt()
{
return cb.length;
}
//---Beschriftung der Buttons----------------------------
public void setLabel(int index, String label)
{
if (index >= 0 && index < cb.length) {
cb[index].setLabel(label);
}
}
public String getLabel(int index)
{
String ret = "***invalid index***";
if (index >= 0 && index < cb.length) {
ret = cb[index].getLabel();
}
return ret;
}
//---Selektiertes Element--------------------------------
public void setSelected(int index)
{
if (index >= 0 && index < cb.length) {
int oldvalue = getSelected();
cb[index].setState(true);
pcs.firePropertyChange("selected", oldvalue, index);
}
}
public int getSelected()
{
int ret = -1;
for (int i = 0; i < cb.length; ++i) {
if (cb[i].getState()) {
ret = i;
break;
}
}
return ret;
}
//---Verwaltung der PropertyChangeListener---
public void addPropertyChangeListener(
PropertyChangeListener l
)
{
pcs.addPropertyChangeListener(l);
}
public void removePropertyChangeListener(
PropertyChangeListener l
)
{
pcs.removePropertyChangeListener(l);
}
//---Reaktion auf Zustands�nderungen---------------------
public void itemStateChanged(ItemEvent event)
{
Checkbox changedcb = (Checkbox) event.getItemSelectable();
if (changedcb.getState()) {
for (int i = 0; i < cb.length; ++i) {
if (cb[i] == changedcb) {
pcs.firePropertyChange("selected", -1, i);
break;
}
}
}
}
//---Private Methoden------------------------------------
/**
* Initialisierung der nicht-persistenten Instanzvariablen.
*/
private void initTransientState()
{
pcs = new PropertyChangeSupport(this);
}
/**
* Wird �berlagert, um nach dem Deserialisieren den transienten
* Zustand zu initialisieren.
*/
private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException
{
stream.defaultReadObject();
initTransientState();
}
}
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