how can you programmatically set the JSplitPane to hide the right/bottom component when OneTouchExpandable is set to true?

Question

In a JSplitPane, you have the setOneTouchExpandable method which provides you with 2 buttons to quickly fully hide or full show the JSplitPan

Answer 1

Working around the problem that setDividerLocation(1.0) doesn't work until the frame has become displayable, one can use an AncestorListener:

sp.addAncestorListener(new AncestorListener {
  def ancestorAdded  (event: AncestorEvent): Unit = sp.setDividerLocation(1.0)

  def ancestorRemoved(event: AncestorEvent): Unit = ()
  def ancestorMoved  (event: AncestorEvent): Unit = ()
})