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From: "usenet" <usenet@THRWHITE.remove-dii-this>
Subject: Re: How to auto-expand JT
Message-ID: <1T3kvap9Is4c@uni.chka.de>
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Date: Wed, 27 Apr 2011 15:25:52 GMT
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.gui:146

  To: comp.lang.java.gui
Real Gagnon <realgagnon+usenet@rgagnon.com> wrote:

> "wensa" <zhengwt@gmail.com> wrote in news:1163937759.015606.159670
> @m7g2000cwm.googlegroups.com:

> > I've googled this topic, but does not get a detailed answer.
> > 
> > Thanks in advance!
> > 

> See http://www.rgagnon.com/javadetails/java-0210.html


expandAll2Last (silly name?) should read

// assumes 'tree' has a DefaultTreeModel!

public void expandAll2Last(JTree tree) 
{ 
    DefaultTreeModel data = (DefaultTreeModel).getModel();

    DefaultMutableTreeNode root = (DefaultMutableTreeNode)data.getRoot();

    if (root != null)
        tree.scrollPathToVisible(new TreePath(data.getPathToRoot(root.getLastLeaf())));
}


or more generally (untested):

public void expandAll2Last(JTree tree)
{
    TreeModel data = tree.getModel();

    Object node = data.getRoot();

    if (node == null)
        return;

    TreePath p = new TreePath(node);

    while (true)
    {
         int count = data.getChildCount(node);

         if (count == 0)
             break;

         node = data.getChild(node, count - 1);
         p = p.pathByAddingChild(node);
    }

    tree.scrollPathToVisible(p);
}

Also, it is not clear why this method should also scroll, and that it does
not expand the last component (even if not a leaf).


Christian

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