Don't want nodes in a JTree to be selectable

I have a JTree and don't want the user to be allowed to select nodes, just leafs should be selectable. Any ideas?
Thanks,
pi-j

Subclass DefaultTreeSelectionModel and override any methods which add new selection paths to prevent nodes from being added to the tree selection paths.

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loopiloo1 wrote:
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How do i get to display the nodes under the root node in a JTree?

In my JTree there is a root node.This root node has 4 child nodes.Each child node in turn has nodes under it.What i need to do is just display the child nodes under the root node i.e., the four child nodes and keep these child nodes in a collapsed state.How do i go sbout this?

Please try this:
tree.expandRow(0);
SwingUtilities.invokeLater(new Runnable(){
    public void run(){
        tree.setRootVisible(false);
});If you want to show the RootHandles:
tree.setShowsRootHandles(true);If you want to keep nodes in collapsed state (not expandable):
        tel = new TreeWillExpandListener() {
            public void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException {
                throw new ExpandVetoException( event, "Don't want" );
            public void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException {
        tree.addTreeWillExpandListener(tel);Some reading material:
http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html
http://java.sun.com/docs/books/tutorial/uiswing/events/treewillexpandlistener.html
Edited by: Andre_Uhres on Nov 14, 2007 5:17 PM
Edited by: Andre_Uhres on Nov 14, 2007 5:33 PM
Edited by: Andre_Uhres on Nov 14, 2007 5:39 PM

Can I move nodes in a jTree without the mouse?

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Events of Nodes in a JTree

Okay, perhaps I am sidetracked today by all the sad craziness occuring in New York and DC, or perhaps I just don't have a grasp on JTrees yet...but...
I have implemented a TreeCellRender to create panels with buttons and other information to be the nodes of a JTree I created. Everything shows up beautifully, however, I want the buttons on this panel to depress and perfom actions (work like normal) when the user clicks/selects such a button in the tree structure. I can't figure out how to properly set up event handlers to get from the tree to the tree node to the "bean" I'm using as a node. If anyone has any helpful hints, I'd appreciate it!
Thanks in advance!

add actionlistener to the JTree, and then get the object by getLastPathComponent, and compare it if its the button and do the action.

Highlighting nodes in a JTree

Hi,
I'd like to know how I can produce the efect of highlighting nodes in a JTree when the mouse moves over the JTree.
Thanks

You say to get the mouseevent coordinates with a mouse
listener, but which component should be the caller of
the methos addMouseListener?
If I choose the jtree, I can't get the 'mouseevent
coordinates' each time the mouse moves over a node,
because the methods mouseEntered and mouseExited are
invoked just once (when the mouse enter inside the
jtree's area (mouseEntered), and when the mouse gets
out the jtree's area(mouseExited)), so I can't change
the boolean field to true for nodes which have the
mouse over.just use mouseMoved of the MouseMotionListener.
however, i have my doubts that you will have a lot of fun with the suggested method (correct though it is).
at least make sure you only call the repaint method if the mouse moved into a new node. you might want to try the the nodeChanged method, that way you don't repaint the whole tree every time.
thomas

Can the name of a specific node in a JTree be returned by MouseEvent?

I have created a mouseListener for a JTree. When a node in the JTree is clicked it should display the name of the node in a JOptionPane. Currently, I have the following:
tree.addMouseListener(new MouseAdapter()
public void mouseClicked(MouseEvent me)
     if(me.getClickCount() % 2 == 0)
     String s = "Blank";
     s = (me.getSource()).toString();
     JOptionPane.showMessageDialog(null, "Double clicked "+ s, "two", JOptionPane.PLAIN_MESSAGE);
}//mouseClicked
});//MouseListener
This gives me the class X Y value, border, maxsize, etc.... when a node is double clicked.
Does anyone know of a better way?

Don't use MouseListener.
Instead, make yourself a TreeSelectionListener as follows:
public class WhererverYourTreeIs implements TreeSelectionListener
     public void valueChanged(TreeSelectionEvent e)
         TreePath path = e.getPath();
         System.out.println(path.getLastPathComponent());
     public void initStuff()
             tree.addTreeSelectionLIstener(this);
}

Dynamically changing the color of nodes in a JTree

I have created a JTree and want to dynamically change the color of some of the TreeNodes as my program runs. The JTree is displayed in a JPanel. There is an algorithm built into which identifies the nodes whose color I need to change. No user actions is performed (everythign is internal to the program).
It seems that in the TreeCellRender only kicks in when the tree is first displayed. How do I get it to re-render the tree when the TreeModel changes? It seems that the Listeners are only looking for external user interactions.
Any help would be greatly appreciated.
Thanks!

I think I was a bit too vague in my question. Let me try again...
I have changed an attribute in a node in a JTree. This attribute is changed after the tree was initially rendered, but while the program is still running. I want to tell the TreeCellRenderer to look again at this node since that attribute that was changed will effect how the node should be renderered. I tried using the nodeChanged() method, but it did not work (the colot of the node did not change). Any advise how I can do this?
Thanks!

Getting TreePath for all nodes in a JTree

Hi everybody
I want to get TreePath for all the nodes in a JTree
Can anybody help me?

Hi,
i tried to used your code.
there is a problem, it is not taking the entire paths.
so if you have some children,it takes the paths only for the fathers.
so i correct it to the following way(it will take the entire paths):
public void getPathForAllNodes(TreePath path)
              Object node = path.getLastPathComponent();
              pathArrayList.add(path);
              TreeModel model = tree.getModel();
              if(model.isLeaf(node))
              return;
              int num = model.getChildCount(node);
              for(int i = 0; i < num; i++)
                   //pathArrayList.add(path);
                   getPathForAllNodes(path.pathByAddingChild(model.getChild(node, i)));
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Hiding / Filtering nodes in a JTree

I'm not exactly sure how to temporarily hide or filter nodes from a JTree. My scenario is described below.
I have a radio button group. If the first radio button is selected, all nodes are displayed. If the second button is selected, certain nodes are hidden.
Here is my attempt to filter nodes. I get the following excpetion when I try to filter nodes:
java.lang.NullPointerException: Null child not allowed
I assume this is coming from the getChild() method. I don't know what else to return besides null if I'm trying to filter the node out.
Can anyone provide some help or insight?
Thanks
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
public class MyTreeModel extends DefaultTreeModel
    * Constructor.
    * @param rootNode The root node.
   public MyTreeModel( DefaultMutableTreeNode rootNode )
      super( rootNode );
    * Gets the child node.
    * @param parent The parent node.
    * @param index The index this child node resides in.
    * @return The child node.
   public Object getChild( Object parent, int index )
      Object child = super.getChild( parent, index );
      if ( RadioBtn.hideNodes() )
         DefaultMutableTreeNode dmtn = ( DefaultMutableTreeNode ) child;
         MyNode eNode = ( MyNode ) dmtn.getUserObject();
         if ( !eNode.hasPermission() )
            child = null;    // "hide" the node
      return child;
    * Gets the index of a child.
    * @param parent The parent node.
    * @param child The child node.
    * @return The index of the child node.
    public int getIndexOfChild( Object parent, Object child )
       int index = super.getIndexOfChild( parent, child );
       if ( RadioBtn.hideNodes() )
          DefaultMutableTreeNode dmtn = ( DefaultMutableTreeNode ) parent;
          MyNode eNode = ( MyNode ) dmtn.getUserObject();
          if ( !eNode.hasPermission() )
             index = -1;
       return index;
    * Returns the number of children attached to the parent node.
    * @param parent The parent node.
    * @return The number of children of the parent node.
   public int getChildCount( Object parent )
      int numChildren = super.getChildCount( parent );
      if ( RadioBtn.hideNodes() )
         int counter = 0;
         DefaultMutableTreeNode dmtn = ( DefaultMutableTreeNode ) parent;
         // Loop through children and keep a count of all children nodes that should stay
         for ( int x = 0; x < numChildren; x++ )
            DefaultMutableTreeNode childDmtn = ( DefaultMutableTreeNode ) dmtn.getChildAt( x );
            MyNode eNode = ( MyNode ) childDmtn.getUserObject();
            if ( eNode.hasPermission() )
               counter++;
         numChildren = counter;
      System.out.println( "Number of children in " + ( DefaultMutableTreeNode ) parent + ": " + numChildren );
      return numChildren;
    * Used from radio buttons to toggle hidden folders on and off.
   public void triggerMe()
      reload();

Here it is optimized, for anyone who may need the code down the road.
   public Object getChild( Object parent, int index )
      Object child = super.getChild( parent, index );
      if ( RadioBtn.isHidden() ) // If we should remove the 'special' nodes
         DefaultMutableTreeNode dParent = ( DefaultMutableTreeNode ) parent;
         int count = 0;
         // Loop through children
         for ( int x = 0; x < dParent.getChildCount(); x++ )
            DefaultMutableTreeNode dChild = ( DefaultMutableTreeNode ) dParent.getChildAt( x );
            MyNode eNode = ( MyNode ) dChild.getUserObject();
            if ( eNode.hasPermission() )
               // If it is the "xth" visible node, break the loop and set this object as the Child node
               if ( count == index )
                  child = dChild;
                  break;
               count++;
      return child;
   }

Duplicate nodes in a JTree

Hello,
How i can i find duplicate nodes in a JTree. And give out a message that the node already exists.
Thanks.
Reg,
suri

The first you have to defind what is dublicating, because the node in the tree is a node itself (e.g. with label node name and icon) and node can have user object that can contains some defind logics and attributes like ID. And then if you just want to not alow to have node with the same name you will check node label. But if you want avoid adding the node with the same user object you have to implement some comparation mechanism on the node or user object lavel.
Hope will help.

How to allow multiple selection of nodes in a JTree

How to allow multiple selection of nodes in a JTree ?
Thanks
S.Satish

By default when you create new instance og JTree the selection model is multiple selection. And if you want to change it you use next:
tee.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
or
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.CONTIGUOUS_TREE_SELECTION);
or
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
Hope will help!

Don't want nodes in a JTree to be selectable

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