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Re: JTree - subnode not a

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  To: comp.lang.java.gui
In article <g7to9c$m5q$1@registered.motzarella.org>,
 Daniele Futtorovic <da.futt.news@laposte.invalid> wrote:

> On 13/08/2008 05:43, pelakh@yahoo.com allegedly wrote:
> > I have a simple JTree in one of my panels, using the 
> > DefaultTreeModel populated with my own FileTreeNode objects, which 
> > extend DefaultMutableTreeNodes. I am adding nodes into the tree by 
> > doing parentNode.add(subNode), which seems to work just fine in 
> > most cases. However, in a particular case, my new nodes don't show 
> > up, even though I can find them both in the children of the parent 
> > and through the tree model. Right after the add, I call repaint to 
> > update the tree, and then trace some debug information I get the 
> > following:
> > 
> > *** This is the first insertion - it works fine ***
> > Row for freq [TreeRoot, Smooth Files, AC #377, 20.250] is 21
> > Row for new path [TreeRoot, Smooth Files, AC #377, 20.250, Baseline 1]
> > is 22 bounds are java.awt.Rectangle[x=80,y=420,width=82,height=20]
> > 
> > *** This is [...] any consequent insertion - does not work***
> > Row for freq [TreeRoot, Smooth Files, AC #377, 20.250] is 21
> > Row for new path [TreeRoot, Smooth Files, AC #377, 20.250, Baseline 2]
> > is -1 bounds are null
> > 
> > It is as if the TreeUI completely loses this node. Furthermore, the 
> > vertical line preceding the label of 'Baseline 1' disappears after 
> > 'Baseline 2' is added, but that is the only visible side effect.
> > 
> > So, where has my missing node(s) gone?
> 
> Do you perform the node addition on the event dispatch thread (EDT)? 
> You ought to.

pelakh: Daniele is right. I was looking at the tutorial, and the demos 
do precisely that in via invokeLater():

<http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html>
<http://java.sun.com/docs/books/tutorial/uiswing/examples/zipfiles/compon
ents-TreeDemoProject.zip>

Looking closer, I see DefaultMutableTreeNode is not thread safe:
 
<http://java.sun.com/javase/6/docs/api/javax/swing/tree/DefaultMutableTre
eNode.html>

-- 
John B. Matthews
trashgod at gmail dot com
home dot woh dot rr dot com slash jbmatthews

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JTree - subnode not added "pelakh" <pelakh@THRWHITE.remove-dii-this> - 2011-04-27 15:47 +0000
  Re: JTree - subnode not a "Daniele Futtorovic" <daniele.futtorovic@THRWHITE.remove-dii-this> - 2011-04-27 15:47 +0000
    Re: JTree - subnode not a "John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this> - 2011-04-27 15:47 +0000
      Re: JTree - subnode not a "pelakh" <pelakh@THRWHITE.remove-dii-this> - 2011-04-27 15:48 +0000

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