JTree Creat for database

Question

Hello
I has class when I creat JTree from database:
Id, name, parent, position - I have this column in tree database
I have:
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.tree.*;
import java.sql.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.MutableTreeNode;
public class PanelWzorcow extends JPanel{
    public JSplitPane podzial = new JSplitPane();
    public JTree drzewko;
    JPanel panelDrzewa = new JPanel(new BorderLayout());
    MutableTreeNode korzen = new DefaultMutableTreeNode("Gł�wna");
    JPanel prawo = new JPanel();
    JToolBar przyciskiDrzewa = new JToolBar();
    JButton dodaj = new JButton("Dodaj");
    JButton edytuj = new JButton("Edytuj");
    DefaultMutableTreeNode top = new DefaultMutableTreeNode("Dokumenty");
    public PanelWzorcow() {
        setLayout(new BorderLayout());
        stworzNode(top);
        drzewko = new JTree(top);
         for (int i = 0; i < drzewko.getRowCount(); i++){
                    drzewko.expandRow(i);}
        drzewko.addTreeSelectionListener(new TreeSelectionListener(){
           public void valueChanged(TreeSelectionEvent e){
               TreePath tp = e.getNewLeadSelectionPath();
               dodaj.setEnabled(tp != null);
        panelDrzewa.add(new JScrollPane(drzewko),BorderLayout.CENTER);
        przyciskiDrzewa.add(dodaj);
        przyciskiDrzewa.add(edytuj);
        panelDrzewa.add(przyciskiDrzewa,BorderLayout.SOUTH);
        podzial.setDividerLocation(0.20);
        podzial.setDividerLocation(200);
        podzial.setLeftComponent(panelDrzewa);
        podzial.setRightComponent(prawo);
        add(podzial,BorderLayout.CENTER);
    public void stworzNode(DefaultMutableTreeNode top){
        try {
            PreparedStatement pobranieGlownych = main.con.prepareStatement("Select nazwa, pozycja, id from drzewo where rodzic = 0 order by pozycja ");
            pobranieGlownych.execute();
            ResultSet pobraneGlowne = pobranieGlownych.getResultSet();           
            int licznik = 0;
            while(pobraneGlowne.next()){
                        top.add(new DefaultMutableTreeNode(pobraneGlowne.getString(1)));
                        PreparedStatement pobraniePodrzednych = main.con.prepareStatement("Select nazwa, pozycja, rodzic from drzewo where rodzic = ? order by pozycja ");
                        pobraniePodrzednych.setInt(1,pobraneGlowne.getInt(3));
                        pobraniePodrzednych.execute();
                        ResultSet pobranePodrzedne = pobraniePodrzednych.getResultSet();  
                        while(pobranePodrzedne.next()){
                               ((DefaultMutableTreeNode)(top.getChildAt(licznik))).add(new DefaultMutableTreeNode(pobranePodrzedne.getString(1)));                        
              licznik++;         
        catch (Exception ex) {
            System.out.println(ex);
}in this class JTree is creat that:
Parent
|_____Child1
| |___MenuChild1_1
| |
| |___MenuChild2_2
|
|_____Child2
|
|___MenuChild2
And now I want click Button "Dodaj" and add new position to Parent or Child1,2 but I don't want add any position to MenuChild... I don't know what do this:
dodaj.setEnabled(false) when I click to "MenuChild..."
Please help me:)
Thenks
Patras

Answer 1

I also don't quite understand what you want.Is it true that "Dodaj" means to add a new node? To the currently selected node? And if the currently-selected node is a MenuChild then you are not allowed to add a new node? Then you need more code here:public void valueChanged(TreeSelectionEvent e){
  TreePath tp = e.getNewLeadSelectionPath();
  dodaj.setEnabled(tp != null);
} First you need to get the last component from that tree path. Cast it to whatever type of node you are using. (DefaultMutableTreeNode?) Then test if that node is a MenuChild and call dodaj.setEnabled() with the result.