Topic: I can't see dynamically added node in JTree.

I can't see dynamically added node in JTree.

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Posted By: Dmitry_Zakharov
Posted On: Wednesday, April 10, 2002 10:24 PM

I create JTree and try to add new node to it. But I don't see new node. I try to set my CellRenderer, but it isn't ask fot component for new node. But I can ask parent tree node that the new child is added, count of children is increased. I can go from root node and print all tree nodes on console and I see that new nodes are appeared. But I don't see them on the screen !

Does anybody know the reason of invisibility of new added node ? You can be very helpful for me !

Thanks beforhand

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Re: I can't see dynamically added node in JTree.

Posted By: Sergey_Vtorov
Posted On: Wednesday, April 17, 2002 09:45 AM

If you are using DefaultTreeModel (default model used by JTree), then you should use model's insertNodeInto() method to add a new node.


    JTree  tree;
    MutableTreeNode parent;
    MutableTreeNode child;

    ...
    // to append child node to the parent node
    ((DefaultTreeModel)tree.getModel()).
        insertNodeInto(child, parent, parent.getChildCount());

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Re: I can't see dynamically added node in JTree.

Posted By: Paul_Connaughton
Posted On: Thursday, April 11, 2002 04:38 AM

How are you adding the node to the JTree?

If you add it directly to a DefaultMutableTreeNode like so:


((DefaultMutableTreeNode)myJTree().getModel().getRoot()).add( myChildNode );

then no events are generated and the JTree is not updated on the screen.

However if you make changes through the DefaultTreeModel like this:


((DefaultTreeModel)myJTree.getModel()).insertNodeInto( myChildNode, (DefaultMutableTreeNode)myJTree().getModel().getRoot(), 0 );

Then the events are triggered and the UI is updated.

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Re: I can't see dynamically added node in JTree.

Posted By: shautvas_t
Posted On: Thursday, April 11, 2002 12:53 AM

have u tried JTree.updateUI() ???

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Re: I can't see dynamically added node in JTree.

Posted By: eyal_lior
Posted On: Thursday, April 11, 2002 12:52 AM

You have to call


nodesWereInserted(parentNode, Childindexes[])

If I added just one node:

int[] indexOfNewNode = new int[1];

indexOfNewNode[0] = treeNode.getIndex(nextTreeNode);

_directoriesTree.nodesWereInserted(treeNode, indexOfNewNode);

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