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Ace128

Posts: 337

Posted: Sun, 27th Jun 2004 01:29 Post subject: Java's Trees (PathTree)

Well, this is screwed up! Or at least it seems so.

Now here's an example:

Code:

DefaultMutableTreeNode rNode = new DefaultMutableTreeNode("/");
DefaultMutableTreeNode cNode = null;
DefaultTreeModel tModel = new DefaultTreeModel(rNode);

DefaultMutableTreeNode rNode2 = new DefaultMutableTreeNode("/");
DefaultMutableTreeNode cNode2 = null;
DefaultTreeModel tModel2 = new DefaultTreeModel(rNode2);

JTree jt = new JTree(tModel);
JTree jt2 = new JTree(tModel2);

cNode = new DefaultMutableTreeNode("demo");
cNode2 = new DefaultMutableTreeNode("demo");

tModel.insertNodeInto(cNode, rNode, cNode.getChildCount());
tModel2.insertNodeInto(cNode2, rNode2, cNode2.getChildCount());

jt.expandRow(0);
jt2.expandRow(0);

TreePath tp = jt.getPathForRow(jt.getRowCount() - 1);

jt2.setSelectionPath(tp);

jScrollPaneDir.setViewportView(jt2);

...

Now, as you can see I got 2 exactly the same trees! The little test here shows that even if they have the same structure, I cant get the path from tree #1 and use that on tree #2!!! (??) I was wondering WHY? and how this can be easly solved! The reason I wanna be able to do this is because three #1 is a more complex tree while the other (tree #2) is supposed to be used to be able to select some particual node in that complex #1 tree. I had in mind to then build a tempurary tree to get the TreePath out, since apparently:

jt.setSelectionPath(tp.pathByAddingChild(node);

aint working either!! Which should be damn much nicer (and faster)!
(but please feel free to make this version work! I could have missed something with some object)

Say I got this in tree#1:

/
| -- demo
| | -- file.zip
| | -- file2.zip
| | -- dir2
| -- {dir3}

where {dir3} indicates that dir3 is now selected. Now, if I wanted to add some node to dir2 there is problem. I couldnt really find anything usefull to help me out with that! I NEED the TreePath to that node (dir2). There really just are:

TreePath pathTree = jt.getSelectionPath();

But that assumes you have selected dir2! Annoying. So, I thought (which is WAY better than make java select it by.. say the setSelectionRow(int row); that I could create the path with the "demo" + adding the "dir2" node. Thus do the: jt.setSelectionPath(tp.pathByAddingChild(new DefaultMutableTreeNode("dir2");
But ofcource that isnt working.

Then I thought, I could recreate a new temptree with just the nodes needed. /demo/dir2 in this case and get the path from that (since I here can use the jttemp.getRowCount(); and select the last one (since its only "one" tree, where I wanna select the last child so to speak))

So, to do: TreePath tptemp = jt.getPathForRow(jt.getRowCount());
And voilá! Well, so I thought. Didnt work to use that tptemp for tree #1!

Got damn its frustrating!

Anyone here got time to help me out? Hope this all made sence.. Basicly, what it comes down to. How do I get a TreePath to /demo/dir2 !! that works so I can use that to insert nodes into that if the node itself isnt even selected!? I really wanna avoid using getSelectionPath()!!

Thanks,
Ace

Hitman02
Banned

Posts: 709
Location: USA

Posted: Thu, 1st Jul 2004 00:29 Post subject:	Quick Quote Quote

well i took a java cource this is kind of advance for me, but ask here it is all about programming and java, i ask there all the time and i guarantie u will find a solution there. http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi www.moviefone.tk

AIM

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