如何编辑作为JTree节点的JTable？

Question

我正在尝试创建一个应用程序，该应用程序允许编辑嵌套在JTree中作为节点的JTable。该应用程序非常简单。 我已正确添加了JTable：添加“步骤”后，双击白色栏以展开JTree的根节点。

但是，我不知道从哪里开始实际编辑作为JTree节点的JTable。

我该怎么做？我已经看到了相关问题的一些链接，但是我不知道如何开始使用它们，尽管被认为是正确的，但所有问题都没有明确的答案。

import java.awt.*;
import java.util.Random;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.event.*;
import javax.swing.tree.*;

public class TP
{
    Random seed;
private DefaultMutableTreeNode selectedNode;

private String[] REAGENT_CNAMES = {"Name", "Quantity", "Quantity Type"};
private String[] STEP_CNAMES = {"Name", "Time", "Time Units"};

public TP()
{
    seed = new Random();

    // south section
JButton addButton = new JButton("Add Step");
addButton.setEnabled(true);

    // center section
    JTree tree = createTree();
    tree.setCellRenderer(new PanelRenderer());
    tree.getSelectionModel().addTreeSelectionListener(
                                     new TreeSelectionListener()
    {
        public void valueChanged(TreeSelectionEvent e)
        {
        Object lastPathComponent = e.getPath().getLastPathComponent();
        TP.this.selectedNode = (DefaultMutableTreeNode)lastPathComponent;

        System.out.println("Number of rows: " + ((JTable)TP.this.selectedNode.getUserObject()).getRowCount());
        System.out.println("Level of the selected node is " + TP.this.selectedNode.getLevel());
        switch(TP.this.selectedNode.getLevel()){
            case 0:
                addButton.setText("Add Step");
                break;
            case 1:
                addButton.setText("Add Reagent");
                break;
            case 2:
                addButton.setText("Add Reagent");
                break;

        }
        addButton.setEnabled(true);
        }
    });



tree.setRowHeight(0);

    JFrame f = new JFrame();
f.getContentPane().setLayout(new BorderLayout());
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(new JScrollPane(tree), BorderLayout.CENTER);

JPanel addPanel = new JPanel(new FlowLayout());

addButton.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e){

        DefaultTreeModel dtm = (DefaultTreeModel)(tree.getModel());

        DefaultMutableTreeNode parent = TP.this.selectedNode;
        DefaultMutableTreeNode toAdd;
        DefaultTableModel tableModel;
        JTable newTable;
        String[][] defaultStepData = {{"Timepoint", "4", "hrs"}};
        String[][] blankData = {{"\t","\t","Default"}};

        switch(parent.getLevel()){
            case 0:
                tableModel = new DefaultTableModel(defaultStepData, STEP_CNAMES);
                newTable = new JTable(tableModel);
                JComboBox comboBox = new JComboBox();
                comboBox.addItem("days");
                comboBox.addItem("hours");
                comboBox.addItem("minutes");
                newTable.getColumnModel().getColumn(2).setCellEditor(new DefaultCellEditor(comboBox));
                toAdd = new DefaultMutableTreeNode(newTable);
                dtm.insertNodeInto(toAdd, parent, parent.getChildCount());
                break;
            case 1:
                tableModel = new DefaultTableModel(blankData, REAGENT_CNAMES);
                newTable = new JTable(tableModel);
                toAdd = new DefaultMutableTreeNode(newTable);
                dtm.insertNodeInto(toAdd, parent, parent.getChildCount());
                break;
            case 2:
                JTable myTable = (JTable)(parent.getUserObject());
                DefaultTableModel theTableModel = (DefaultTableModel)(myTable.getModel());
                theTableModel.addRow(blankData);
                dtm.nodeChanged(parent);

                break;
            default:
                break;

        }

    }
});
addPanel.add(addButton);

    f.add(addPanel, BorderLayout.SOUTH);
    f.setSize(1000,800);
    f.setLocation(200,200);
    f.setVisible(true);
}

private JTree createTree()
{
    int children = 0;
    int grandChildren = 0;
    DefaultMutableTreeNode root = new DefaultMutableTreeNode(new JTable());
TP.this.selectedNode = root;
    DefaultMutableTreeNode node;
    for(int j = 0; j < children; j++)
    {

    String[][] pdata = {{"Jonah","4", "Rules"}};
    String[] pcnames = {"Name", "Time", "Time Units"};
    JTable parent = new JTable(pdata, pcnames); 
    node = new DefaultMutableTreeNode(parent);
    root.add(node);

            for(int k = 0; k < grandChildren; k++){
        String[][] data = {{"A11", "A12", "A13"}, {"A21", "A22", "A23"}, {"A31", "A32", "A33"}};
        String[] cnames = {"Col1", "Col2", "Col3"};

        JTable value = new JTable(data, cnames);    
        node.add(new DefaultMutableTreeNode(value)); 
    }
    }

    DefaultTreeModel model = new DefaultTreeModel(root);
JTree treeToReturn = new JTree(model);
    return treeToReturn;
}

public static void main(String[] args)
{
    new TP();
}
}


class PanelRenderer implements TreeCellRenderer
{

public PanelRenderer(){} 

public Component getTreeCellRendererComponent(JTree tree,
                                              Object value,
                                              boolean selected,
                                              boolean expanded,
                                              boolean leaf,
                                              int row,
                                              boolean hasFocus)
{


    JTable tbl = (JTable)(((DefaultMutableTreeNode)value).getUserObject());


    JScrollPane jsp = new JScrollPane(tbl);

    if(tbl.getRowCount() == 0){
    jsp.setPreferredSize(new Dimension(500, 25));
    }else{
        Dimension prefSize = tbl.getPreferredSize();
    jsp.setPreferredSize(new Dimension((int)(prefSize.getWidth()), (int)(prefSize.getHeight())+20));
    }

    if(hasFocus){
        jsp.setBackground(Color.BLUE);
    }

            //jsp.setSize(500, tbl.getRowCount()*30 + 25);
    System.out.println("Row "+row+" " + tbl.getPreferredSize());

    return jsp;
}
}