JTree adding to expanded nodes

Hey,
I'm writing a program that contains a JTree with two parent nodes and child nodes that are added/removed on demand.
Basically I can't add child nodes while the parent node is expanded. Following the code it actually does add it, just does not update the display.
I've tried validate/repaint/anything I could find that may be of some help with no luck.
Any ideas?
Thanks in advance :)

What do you think about the library I created which
addresses this issue?
Denis Krukovsky
http://dotuseful.sourceforge.net/
I looked at your site and spent 20 minutes trying to figure out why your classes are useful. It's not at all clear why someone should use them. I also looked over your previous posts, but you never seem to explain why someone should use them.

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Reload JTree and keep expanded nodes

Hi all,
I have spent some time looking around on this, found some useful stuff, but I still cannot seem to get a result.
Here is my situation:
I have a JTree for a GUI desktop app. I build the tree from a database file. The user has the ability to refresh the tree to keep it in sync with any database changes. The problem is that when I refresh, all the nodes that were previously expanded are now collapsed again.
Having looked around, I have seen a lot of JTree.expandRow() answers, but I don't want to use expandRow, as the rows will changes according to any db changes.
I thought a good solution would be to trap any expand or collapse events and for each either add or remove the TreePath for the relevant node onto a List. When the users refreshes the tree, I thought I could run through the list and expand any TreeNodes I find. I also found someone advocating such an approach in another thread. BUT - it doesn't work for me Here is the code for my refresh. Any help/advice, greatly appreciated.
Thanks in advance,
Steve
private void refreshBrowser(){
 System.out.println("Refresh browser - Started");
 rootTreeNode.removeAllChildren(); // remove all nodes from root
 loadBrowserData(); // This method loads nodes from a database
 Iterator<TreePath> TPI = objectTreePaths.iterator(); // run throught my saved paths
 while (TPI.hasNext()) {
 TreePath yTreePath = TPI.next();
 browserTree.expandPath(yTreePath); // Expand each found path
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Here is my situation:
I have a JTree for a GUI desktop app. I build the
tree from a database file. The user has the ability
to refresh the tree to keep it in sync with any
database changes. The problem is that when I refresh,
all the nodes that were previously expanded are now
collapsed again.
Having looked around, I have seen a lot of
JTree.expandRow() answers, but I don't want to use
expandRow, as the rows will changes according to any
db changes.you could use:
JTee.scrollPathToVisible(path);
Where path is obtained in this way from a DefaultMutableTreeNode (TreeNode):
TreePath path = new TreePath(((DefaultMutableTreeNode)node).getPath());
I thought a good solution would be to trap any expand
or collapse events and for each either add or remove
the TreePath for the relevant node onto a List. When
the users refreshes the tree, I thought I could run
through the list and expand any TreeNodes I find. I
also found someone advocating such an approach in
another thread. BUT - it doesn't work for me When you perform a JTree.reload() call, it will collapse each node.
My advice is to call JTree.reload() and then call JTree.scrollPathToVisible(path) for each TreeNode previously expanded.
Hope this can help,
regards

Trouble with JTree's and autmoatically expanding nodes

I am writing an application which uses a JTree as a method of browsing through a certain structure (like a file system). I am having a little trouble though, with a number of small issues, which I am finding hard to get answers through searches (and have spent a fair while searching). In navigating the tree, I want to be able to automatically expand nodes.
Firstly, I want the Root node to automatically be expanded. I cannot see ways of doing this. I have seen references to EXPANDED being set for the JTree constructor, but I cannot see any reference in the 1.6 API for this.
Secondly, I want to be able to expand or hide the contents of nodes through other means than clicking on the icon to the left of a non-leaf-node. For example a button that would hide the contents of (i.e. close) the currently selected node. Code such as:
myNode.setExpanded(true);
myNode.setExpanded(false);and
myNode.isExpanded();

That's the ticket - again something I had seen, but had been using in the wrong way, but your suggestion has helped me get it right. I was trying to expand the path before any more nodes were added to the root node. Then nodes are added, and the application loaded with the root node collapsed. So now I have placed the call at the end of the recursive call to populate the tree.
Thanks again.

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I have an application that uses JTree
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But when I use setSelectionPath(path) it is selected (I know because I see information about the node) but it is not displayed nor viewable.
I only can expand nodes using expandRow(int).
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expandPath(Treepath treePath) should work. Its possible that your treePath is wrong. How do you get the treePath?

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zia

Try to use
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Hi all,
In the given tree structure, I want to get a node to be selected, once it is expanded.
+ Folder1
- Folder2
      |
      |__-Folder3
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Also, I need to get the path of the expanded node . ie; when Folder4 is expanded, I need to
get Folder4 selected and path has to be obtained as \Folder2\Folder3\Folder4.
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also, the path is obtained based on selection and not based on expansion.
Please help with a solution
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AneesAhamed wrote:
Hi all,
In the given tree structure, I want to get a node to be selected, once it is expanded.
+ Folder1
- Folder2
|
|__-Folder3
       |
       |__-Folder4
          |
            |__ file1.docCurrently, if I have Folder1 selected and if I expand Folder2, the selection remains at
Folder1 itself. I need to change the selection to Folder2.
Also, I need to get the path of the expanded node . ie; when Folder4 is expanded, I need to
get Folder4 selected and path has to be obtained as \Folder2\Folder3\Folder4.
I found this link helpful-- http://forums.sun.com/thread.jspa?messageID=3616726, but there
also, the path is obtained based on selection and not based on expansion.
Please help with a solution
Regards,
AneesTo expand any node you need to "know" it either due to a user's mouse click or inside the code that expands it directly, something like :
- by mouse click :
myJTree.addMouseListener(new MouseAdapter()
     public void mouseClicked(MouseEvent e)
          TreePath treePath = getPathForLocation(e.getX(), e.getY());
});- direct code :
public void treeWillExpand(TreeExpansionEvent e)
     TreePath treePath = e.getPath();
}Then you can get the corresponding node from the TreePath :
DefaultMutableTreeNode node = (DefaultMutableTreeNode)treePath.getLastPathComponent();But for a selection this should be enough :
myJTree.setSelectionPath(treePath);
myJTree.scrollPathToVisible(treePath);Regards,
Lara.

Expanded node and children are seen only after second expansion

Hi,
I am using a simple JTree control. I am populating children of nodes dynamically when the node is expanded. For this, I first add a "dummy" item for each node under the root, so that the "+" sign appears next to the node. When a node is expanded, I delete the "dummy" node and add children to it. However, the first time I expand the node, the node actually doesn't expand, though treeExpanded() gets called and all children are added correctly (I verified by debugging). When I expand the tree the second time, I can see the expanded node.
I am using TreeModel's removeNodeFromParent(childNode) and insertNodeInto(childNode, parentNode, childIndex) method to remove and add children respectively.I believe we don't have to explicitly call TreeModel's nodeChanged(), nodesWereInserted() etc?
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Thanks in advance,
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Hi db,
I didn't realize that there was a response to my earlier thread. I added the thread to my watchlist. I was under the impression that I would be notified via email in case of a reply to the thread. However, I didn't receive any. Anyway, I did reply to that response there now.

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HI,
I have a requirement to build a tree dynamically. On expanding each node I need to create sub nodes inside that. But it is always creating inside the node where the lead selection is and not inside the current expanded node. Even though I have used getTreeSelection () to get the current element.
Detailed description about the application.,
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|
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Where this returns me only the name of LeadSelection node and not the node which i try to expand. 
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HI Ayyapparaj ,
First I would like to thank you for your reply.
So it means that we cannot identify the currently expanded node in tree UI element and It will always be the lead selection node we will be able to get rite?
Can we make the current lead selection to currently expanded node 'By Default'?
Coming back to your solution.,
I created a context element 'isExpanded' of type boolean inside the TreeNode.
You said that there will be a call made to 'getter and setter' methods while we expand the node and we can set the lead selection to that element from there.
Could you please give me some more details of how to achieve it.
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Edited by: Ramses Hutahaean on Feb 29, 2012 1:38 PM

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JTree adding to expanded nodes

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