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.
void treeWillExpand(TreeExpansionEvent event)
throws ExpandVetoException Invoked whenever a node in the tree is about to be expanded.
ExpandVetoExceptionvoid treeWillCollapse(TreeExpansionEvent event)
throws ExpandVetoException Invoked whenever a node in the tree is about to be collapsed.
ExpandVetoException
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