Netbeans ExplorerTopComponent Node losing focus when showing dialog - netbeans

Question

I have a netbeans RCP application that shows a set of nodes in the explorertopcomponent. When selected, I display details on the editortopcomponent and it works well. When I show a dialog using JOptionPage on the editor, the selected node in the tree is deselected, and eventually my editortopcomponent also loses the selected node details. Is there a way to save the selected node in the tree from being deselected if a dialog opens?
Thanks.

Answer 1

it is simple.
In your explorertopcomponent you have LookupListner, that "is waiting" on event "someYourNodeClass" (for example Album)appears in the lookup. You must removeLookupListener, when your explorertopcomponent is not visible or yust do nothing.
/**
* your explorertopcomponent
*/
#ConvertAsProperties(
dtd = "-//com.galileo.netbeans.module//Y//EN",
autostore = false)
#TopComponent.Description(
preferredID = "YTopComponent",
//iconBase="SET/PATH/TO/ICON/HERE",
persistenceType = TopComponent.PERSISTENCE_ALWAYS)
#TopComponent.Registration(mode = "explorer", openAtStartup = false)
#ActionID(category = "Window", id = "com.galileo.netbeans.module.YTopComponent")
#ActionReference(path = "Menu/Window" /*, position = 333 */)
#TopComponent.OpenActionRegistration(
displayName = "#CTL_YAction",
preferredID = "YTopComponent")
#Messages({
"CTL_YAction=Y",
"CTL_YTopComponent=Y Window",
"HINT_YTopComponent=This is a Y window"
})
public final class YTopComponent extends TopComponent implements LookupListener {
private Lookup.Result<Album> result;
public YTopComponent() {
initComponents();
setName(Bundle.CTL_YTopComponent());
setToolTipText(Bundle.HINT_YTopComponent());
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
}// </editor-fold>
// Variables declaration - do not modify
// End of variables declaration
#Override
public void componentOpened() {
result = Utilities.actionsGlobalContext().lookupResult(Album.class);
result.addLookupListener(this);
}
#Override
public void componentClosed() {
result.removeLookupListener(this);
}
void writeProperties(java.util.Properties p) {
// better to version settings since initial version as advocated at
// http://wiki.apidesign.org/wiki/PropertyFiles
p.setProperty("version", "1.0");
// TODO store your settings
}
void readProperties(java.util.Properties p) {
String version = p.getProperty("version");
// TODO read your settings according to their version
}
public void resultChanged(LookupEvent le) {
Collection<? extends Album> allInstances = result.allInstances();
TopComponent findTopComponent = WindowManager.getDefault().findTopComponent("YourNodeExplorerWindow");
if (findTopComponent == null) {
return;
}
if (!findTopComponent.isShowing()) {
return;
}
if (!allInstances.isEmpty()) {
showDetail(allInstances.iterator().next());
}
}
}
Jirka