Preventing Expansion or Collapse of a Node in a JTree: override JTree.setExpandedState() : Tree « Swing JFC « Java






  1. Java
  2. Swing JFC
  3. Tree

Preventing Expansion or Collapse of a Node in a JTree: override JTree.setExpandedState()

    

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.TreePath;

public class Main {
  public static void main(String[] argv) {

    JTree tree = new JTree() {
      protected void setExpandedState(TreePath path, boolean state) {
        
        if (state) {
          super.setExpandedState(path, state);
        }
      }
    };

    JFrame frame = new JFrame("Ignore all collapse requests");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(new JScrollPane(tree));
    frame.setSize(380, 320);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);

  }
}








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