how to keep change after i edit the Jtree's leaves??

[Michelle Wang]

Hi,
I have following code can edit the leaf of the JTree,
But after i edit it, I found what I updated is lost, How can I persist all changes I made to these edited leaves and nodes(not leaf).
ie, to keep all these changes until i update them later.

thanks

sunny girl


import java.awt.BorderLayout;
import java.util.EventObject;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellEditor;
import javax.swing.tree.TreeNode;

public class EditLeafSample {
public static void main(String args[]) {
JFrame frame = new JFrame("Editable Tree");
JTree tree = new JTree();
tree.setEditable(true);

DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) tree.getCellRenderer();
TreeCellEditor editor = new LeafCellEditor(tree, renderer);
tree.setCellEditor(editor);

JScrollPane scrollPane = new JScrollPane(tree);
frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
frame.setSize(300, 150);
frame.setVisible(true);
}
}

class LeafCellEditor extends DefaultTreeCellEditor {

public LeafCellEditor(JTree tree, DefaultTreeCellRenderer renderer) {
super(tree, renderer);
}

public LeafCellEditor(JTree tree, DefaultTreeCellRenderer renderer,
TreeCellEditor editor) {
super(tree, renderer, editor);
}

public boolean isCellEditable(EventObject event) {
// Get initial setting
boolean returnValue = super.isCellEditable(event);
// If still possible, check if current tree node is a leaf
if (returnValue) {
Object node = tree.getLastSelectedPathComponent();
if ((node != null) && (node instanceof TreeNode)) {
TreeNode treeNode = (TreeNode) node;
returnValue = treeNode.isLeaf();
}
}
return returnValue;
}
}

[Craig Wood]

Calling the stopCellEditing method should end the editing session and save the edit value to the model.

[Michelle Wang]

Craig, Thanks a lot, but I am newbie to swing, can you help throw more light?? where to call, how to call??
Thanks
really appreciate it.

[Craig Wood]

Editing in Tree Views

import java.awt.*;
import java.awt.event.*;
import java.util.EventObject;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
 
public class ELS {
    public static void main(String args[]) {
        JFrame frame = new JFrame("Editable Tree");
        JTree tree = new JTree();
        tree.setEditable(true);
 
        DefaultTreeCellRenderer renderer =
            (DefaultTreeCellRenderer) tree.getCellRenderer();
        TreeCellEditor editor = new LeafCellEditor(tree, renderer,
                                                   new LeafEditor());
        tree.setCellEditor(editor);
 
        // This allows the edit to be saved if editing is interrupted
        // by a change in selection, focus, etc -> see method detail.
        tree.setInvokesStopCellEditing(true);
 
        JScrollPane scrollPane = new JScrollPane(tree);
        frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
        frame.setSize(300, 350);
        frame.setVisible(true);
    }
}
 
class LeafCellEditor extends DefaultTreeCellEditor {
    public LeafCellEditor(JTree tree, DefaultTreeCellRenderer renderer) {
        super(tree, renderer);
    }
 
    public LeafCellEditor(JTree tree, DefaultTreeCellRenderer renderer,
                          TreeCellEditor editor) {
        super(tree, renderer, editor);
    }
}
 
class LeafEditor extends AbstractCellEditor implements TreeCellEditor,
                                                       ActionListener {
    JTextField textField;
 
    public LeafEditor() {
        textField = new JTextField();
        textField.addActionListener(this);
    }
 
    public Component getTreeCellEditorComponent(JTree tree,
                                                Object value,
                                                boolean isSelected,
                                                boolean expanded,
                                                boolean leaf, int row) {
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
        textField.setText(node.toString());
        return textField;
    }
 
    public boolean isCellEditable(EventObject event) {
        //System.out.println("event = " + event);
        // Get initial setting
        boolean returnValue = super.isCellEditable(event);
        if(event instanceof MouseEvent) {
            // If still possible, check if current tree node is a leaf
            if (returnValue) {
                JTree tree = (JTree)event.getSource();
                Object node = tree.getLastSelectedPathComponent();
                if ((node != null) && (node instanceof TreeNode)) {
                    TreeNode treeNode = (TreeNode) node;
                    returnValue = treeNode.isLeaf();
                }
            }
        }
        return returnValue;
    }
 
    public Object getCellEditorValue() {
        return textField.getText();
    }
 
    /** Press enter key to save the edited value. */
    public void actionPerformed(ActionEvent e) {
        super.stopCellEditing();
    }
}

[Andrei Pat]

if you want to keep the changes when focus is lost, you just have to call tree.setInvokesStopCellEditing(true)

[Andrei Pat]

if you want to keep the changes when focus is lost, you just have to call tree.setInvokesStopCellEditing(true), otherwise the changes remain only if you press the "Enter" key

[Michelle Wang]

Thanks so much, it works!!

[Rob Spoor]

ramswaroop ram,
Your post was moved to a new topic.

[Rob Spoor]

rohit Patel,
Your post was moved to a new topic.