- All Superinterfaces:
- 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.
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Method SummaryModifier and TypeMethodDescriptionvoidInvoked whenever a node in the tree is about to be collapsed.voidtreeWillExpand(TreeExpansionEvent event) Invoked whenever a node in the tree is about to be expanded.
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Method Details- 
treeWillExpandInvoked whenever a node in the tree is about to be expanded.- Parameters:
- event- a- TreeExpansionEventcontaining a- TreePathobject for the node
- Throws:
- ExpandVetoException- to signify expansion has been canceled
 
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treeWillCollapseInvoked whenever a node in the tree is about to be collapsed.- Parameters:
- event- a- TreeExpansionEventcontaining a- TreePathobject for the node
- Throws:
- ExpandVetoException- to signify collapse has been canceled
 
 
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