How To Disable JTree Collapse Event

Disabling the collapse event of the JTree is possible by adding a listener to it. There may be times where you want your JTree to be always in expanded mode hence disabling its collapse event is the only way to go.

Add a TreeWillExpandListener to the JTree, make the treeWillCollapse() method throw ExpandVetoException and that should do it.

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  1. One Response to “How To Disable JTree Collapse Event”

  2. Thanks a lot for the code to disable this. I was struggling to get it right.

    By Scrabble Fan on Apr 14, 2013

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