Module java.desktop
Package javax.swing.event

Interface TreeWillExpandListener

All Superinterfaces:
EventListener
public interface TreeWillExpandListener extends EventListener
The listener that's notified when a tree expands or collapses a node. For further information and examples see How to Write a Tree-Will-Expand Listener, a section in The Java Tutorial.

  • Method Details

    • treeWillExpand

      void treeWillExpand​(TreeExpansionEvent event) throws ExpandVetoException
      Invoked whenever a node in the tree is about to be expanded.
      Parameters:
      event - a TreeExpansionEvent containing a TreePath object for the node
      Throws:
      ExpandVetoException - to signify expansion has been canceled

    • treeWillCollapse

      void treeWillCollapse​(TreeExpansionEvent event) throws ExpandVetoException
      Invoked whenever a node in the tree is about to be collapsed.
      Parameters:
      event - a TreeExpansionEvent containing a TreePath object for the node
      Throws:
      ExpandVetoException - to signify collapse has been canceled