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## echopointng.tree
Interface TreeWillExpandListener

All Superinterfaces:
  java.util.EventListener

    public interface TreeWillExpandListener

extends java.util.EventListener

`TreeWillExpandListener` is notified when a `Tree` is about to expand or collapse a node. The listener has a chance therefore to throw an `ExpandVetoException` to prevent the operation.

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

### treeWillCollapse

    void treeWillCollapse(TreeExpansionEvent event)
                          throws ExpandVetoException

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

  Throws:
    `ExpandVetoException`

### treeWillExpand

    void treeWillExpand(TreeExpansionEvent event)
                        throws ExpandVetoException

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

  Throws:
    `ExpandVetoException`

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