[CTJUG Forum] Re: JTree problem

Enrico Goosen Thu, 02 Mar 2006 08:50:42 -0800

Hi Carl,

My code is almost identical to the DynamicTreeDemo.java code:

http://java.sun.com/docs/books/tutorial/uiswing/components/example-1dot4/index.html#DynamicTreeDemo

If you take a look at the DynamicTreeDemo code, you’ll notice that they don’t repaint after adding a node.

I’m really baffled.

If anyone has some time on their hands, and Swing experience, I’ll send you my code to compare with DynamicTreeDemo.

Rgds,

Enrico

From: [email protected] [mailto:[email protected]] On Behalf Of Carl Olivier
Sent: 02 March 2006 06:37 PM
To: [email protected]
Subject: [CTJUG Forum] Re: JTree problem

Not a paint(Graphics g) problem?

Mebe you need to refresh the item on screen? Its been years sisnce I did any java gui/awt/swign development :) But I recall that sometimes you needed to manually tell the object to repaint itself or update or something along those lines...

Rgds,

Carl

From: [email protected] [mailto:[email protected]] On Behalf Of Enrico Goosen
Sent: 02 March 2006 16:34
To: [email protected]
Subject: [CTJUG Forum] JTree problem

Hi All,

I’m experiencing a problem with a JTree which is really baffling me.

I’m trying to insert a node into a JTree on a specific user action using this code (taken from The Java Tutorial).

public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,

Object child,

boolean shouldBeVisible) {

DefaultMutableTreeNode childNode =

new DefaultMutableTreeNode(child);

if (parent == null) {

parent = rootNode;

}

treeModel.insertNodeInto(childNode, parent,

parent.getChildCount());

//Make sure the user can see the lovely new node.

if (shouldBeVisible) {

tree.scrollPathToVisible(new TreePath(childNode.getPath()));

}

return childNode;

}

The problem is that the newly added node doesn’t display in the JTree??!

I’ve even added this to check that a node was in fact added:

return (DefaultMutableTreeNode)fTreeModel.getChild(rootNode, parent.getChildCount()-1);

and it returns the node that was added.

But the JTree doesn’t display the node.

Any ideas what I’m doing wrong?

Enrico Goosen

Software Developer

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[CTJUG Forum] Re: JTree problem

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