[CTJUG Forum] Re: JTree problem

Thu, 02 Mar 2006 10:29:04 -0800

Hi Enrico,

You're welcome to send me your code, off-list of course.

Regards,
Ben

Enrico Goosen wrote:

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

SAICOM TECHNOLOGY

TEL:       +2721 555 0726

FAX:     +2721 555 0821

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Ben van der Merwe
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