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## 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 Summary
`void` | `treeWillCollapse(TreeExpansionEvent event)` Invoked whenever a node in the tree is about to be collapsed.
`void` | `treeWillExpand(TreeExpansionEvent event)` Invoked whenever a node in the tree is about to be expanded.

Method Detail

### treeWillExpand

    public void treeWillExpand(TreeExpansionEvent event)
                        throws ExpandVetoException

  Invoked whenever a node in the tree is about to be expanded.

### treeWillCollapse

    public void treeWillCollapse(TreeExpansionEvent event)
                          throws ExpandVetoException

  Invoked whenever a node in the tree is about to be collapsed.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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