extends DefaultTreeCellEditor to create Tree Leaf editor : Tree Renderer Editor « Swing JFC « Java

1. Java
2. Swing JFC
3. Tree Renderer Editor

extends DefaultTreeCellEditor to create Tree Leaf editor

  
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) {
    boolean returnValue = super.isCellEditable(event);
    if (returnValue) {
      Object node = tree.getLastSelectedPathComponent();
      if ((node != null) && (node instanceof TreeNode)) {
        TreeNode treeNode = (TreeNode) node;
        returnValue = treeNode.isLeaf();
      }
    }
    return returnValue;
  }
}

           
         
    
  

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