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## org.eclipse.jface.viewers
Interface ITreeViewerListener

public interface ITreeViewerListener

A listener which is notified when a tree viewer expands or collapses a node.

Method Summary
`void` | `treeCollapsed(TreeExpansionEvent event)` Notifies that a node in the tree has been collapsed.
`void` | `treeExpanded(TreeExpansionEvent event)` Notifies that a node in the tree has been expanded.

Method Detail

### treeCollapsed

    public void treeCollapsed(TreeExpansionEvent event)

  Notifies that a node in the tree has been collapsed.

  Parameters:
    `event` - event object describing details

### treeExpanded

    public void treeExpanded(TreeExpansionEvent event)

  Notifies that a node in the tree has been expanded.

  Parameters:
    `event` - event object describing details

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