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How does ComboBox extend beyond the window borders?

1056224Feb 3 2014 — edited Feb 3 2014

I noticed that the ComboBox can extend beyond the window borders. I'd like to implement something like that for a custom control of mine, but can't figure out how to do it. I know that it happens by simply setting a large enough value via setVisibleRowCount, but what I am interested in is how the combobox manages to be larger than the pane it is in so that I can copy that behaviour for my own control.

Here is a screenshot to clarify what I am talking about.

Thanks in advance
This post has been answered by James_D on Feb 3 2014
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James_D
Answer

The popup portion of the ComboBox is represented by a PopupControl. This is a subclass of Window, so it's not constrained by the bounds of the window in which the ComboBox is placed.

Marked as Answer by 1056224 · Sep 27 2020
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Locked on Mar 3 2014
Added on Feb 3 2014
#javafx-2-0-and-later
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