JTree not updating after removing node and cant get background to change...

[Chris Dancy]

so when I remove a node from the JTree it does repaint how it's suppose to even after a call to repaint. This is what I did..

 
DefaultMutableTreeNode node = (Default....)this.getModel().getRoot().getChildAt(2);
node.remove(3);
node.updateUI();

I've also tried repaint(), updateUI(), revalidate() and nothing seems to work. It removes the node but still half-@$$ draws whats left. however if I remove the jtree and put it back on the screen the nodes are gone that I've removed.

Also another thing I can't figure out is how to change the background of the jtree or simply set it to transparent. setOpaque(false) simply gets me a gray background, and I want no colors at all...just straight through to the background...any ideas?

[Chris Dancy]

Sorry I figured out the problem to my first question... Simply grad the treeModel like so..

DefaultTreeModel model = (DefaultTreeModel)this.getModel(); // Where this == JTree
model.reload(projectNode); // Where projectNode is the node of the parent, that I'm removing. I'm not sure if that came
                                        // out ok, but the node has already been removed, so we reload the parent.

And that did it. However I can't seem to find anywhere to change the background of the JTree... Any ideas?

[Michael Dunn]

> how to change the background of the jtree or simply set it to transparent.

set a cellRenderer and use (along with opaque(false))
setBackgroundNonSelectionColor(new Color(0,0,0,0));