Thank you very much, thomas
here's the final sample code and it really works... :)
but the problem is, in the MainMenu, I don't know which listbox that
send the listener.
in the MainMenu, I provide three textboxes
txtListA = catch the event from listA
txtListB = catch the event from listB
txtListC = catch the event from listC
so, I have to know first, the name of the sender widget, (which is
listA? listB? or listC?)
then set the txtListA.setText(listA); and so on
I have no idea, how to get the sender name.
I have tried sender.getclass().getname() but the result is not what I
want.
please help me (again) ;)
best regards
/****************
* iCombo.java
****************/
public class iCombo extends Composite implements SourcesChangeEvents
{
private HorizontalPanel hPanel = new HorizontalPanel();
private ListBox ListA = new ListBox();
private ListBox ListB = new ListBox();
private ListBox ListC = new ListBox();
private ChangeListenerCollection listeners = new
ChangeListenerCollection();
public iCombo () {
hPanel.add(ListA);
hPanel.add(ListB);
hPanel.add(ListC);
FillList();
ListA.addChangeListener(new ChangeListener() {
public void onChange(Widget arg0) {
listeners.fireChange(ListA);
}
});
ListB.addChangeListener(new ChangeListener() {
public void onChange(Widget arg0) {
listeners.fireChange(ListB);
}
});
ListC.addChangeListener(new ChangeListener() {
public void onChange(Widget arg0) {
listeners.fireChange(ListC);
}
});
initWidget(hPanel);
}
private void FillList() {
ListA.clear();
ListA.addItem("ListA1");
ListA.addItem("ListA2");
ListA.addItem("ListA3");
ListB.clear();
ListB.addItem("ListB1");
ListB.addItem("ListB2");
ListB.addItem("ListB3");
ListC.clear();
ListC.addItem("ListC1");
ListC.addItem("ListC2");
ListC.addItem("ListC3");
}
public void addChangeListener(ChangeListener listener) {
listeners.add(listener);
}
public void removeChangeListener(ChangeListener listener) {
listeners.remove(listener);
}
}
/****************
* iComboParent.java
****************/
public class iComboParent extends Composite implements
SourcesChangeEvents {
private HorizontalPanel vPanel = new HorizontalPanel();
private iCombo MyCombo = new iCombo();
private Button btn1 = new Button("OK");
private ChangeListenerCollection listeners = new
ChangeListenerCollection();
public iComboParent() {
vPanel.add(MyCombo);
vPanel.add(btn1);
initWidget(vPanel);
MyCombo.addChangeListener(new ChangeListener() {
public void onChange(Widget sender) {
listeners.fireChange(sender);
}
});
}
public void addChangeListener(ChangeListener listener) {
listeners.add(listener);
}
public void removeChangeListener(ChangeListener listener) {
listeners.remove(listener);
}
}
/****************
* MainMenu.java
****************/
public class MainMenu implements EntryPoint {
private VerticalPanel vPanel = new VerticalPanel();
private TextBox txtListA = new TextBox();
private TextBox txtListB = new TextBox();
private TextBox txtListC = new TextBox();
private ComboParent cp = new ComboParent ();
public void onModuleLoad() {
vPanel.add(txtListA);
vPanel.add(txtListB);
vPanel.add(txtListC);
vPanel.add(cp);
cp.addChangeListener(new ChangeListener() {
public void onChange(Widget sender) {
ListBox lb = (ListBox) sender;
txtListA.setText(lb.getItemText(lb.getSelectedIndex()));
}
});
RootPanel.get().add(vPanel);
}
}
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