Much of the internal JavaFX implementation is performed subclassing Region (or 
Control which is just a Region subclass itself) and overriding layoutChildren, 
but I'm not aware of any official documentation on the subject other than the 
sparse stuff in the Javadoc - so no real tutorials.

Maybe try studying some of the JavaFX source which extends Region.

For example, take a look at Axis:

It would be nice if Oracle or somebody else produced some documentation on 
this.   You could create a feature request in Jira 
( for such documentation or email the 
documentation team (, or write a blog or a openjfx 
wiki article ( if you work 
out some good techniques.


-----Original Message-----
From: openjfx-dev [] On Behalf Of 
Jeffrey Guenther
Sent: Thursday, May 29, 2014 11:45 PM
Subject: Extending a Region to create a JUNG Layout


I'm in the midst of exploring how I might port JUNG( to JavaFX. JUNG is a graph/layout tool 
my lab uses for some of their data visualizations. With the release of JavaFX 
2, we've started building our prototypes in JavaFX.

Rather than use the JFXSwingPanel, I want to try modifying the JUNG to work 
"natively" in JavaFX. In the long term, I'd like to see JUNG ported completely 
to JavaFX using properties, CSS and the like.

I've built a quick demo ( and need help going 
forward. I've been reading the docs and hitting google, but I think I need more 

Can someone point me to a detailed explanation of how to extend Region to 
create my own layout?
In particular, how can I get a region to relayout it's children when it's being 
When does a the region's parent call layoutChildren()?
If the height and width of the region are set to Double.MAX_VALUE indicating 
the area can grow infinitely, how does the region know what size to set itself 


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