Editing in Tree....

Question

Hi group,
In my tree I am setting in setCellRenderer method like
mytree.setCellRenderer(new CellRend());
In CellRend class:which extends DefaultTreeCellRenderer.
in that getTreeCellRendererComponent()... I write like..
public java.awt.Component getTreeCellRendererComponent(
     javax.swing.JTree tree,
     Object value,
     boolean sel,
     boolean expanded,
     boolean leaf,
     int w,
     boolean hasFocus) {
     setOpenIcon(new ImageIcon("open.gif"));
     setClosedIcon(new ImageIcon("closed.jpg"));
     java.awt.Component compo = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, w, hasFocus);
     javax.swing.tree.DefaultMutableTreeNode node = (javax.swing.tree.DefaultMutableTreeNode)value;
     if(node.toString().equalsIgnoreCase("House"))
          tree.setEditable(false);
     else
          tree.setEditable(true);
     return compo;
in my tree I have "House" node out of 10 nodes.
I don't want to edit that particular "House" node.
But as per my code it is editing why?
Is any possible solution not to edit that "House" node.?
Shalinipriya.

Answer 1

if you call tree.setEditable(true) (or false) this changes the editing option for the entire tree, not just the current node. And the tree cell renderer gets called for all the nodes... So here's what is happening in your code:
Let us assume that node 7 is your "House" node...
The tree starts to render the nodes... it calls getTreeCellRendererComponent() for nodes 1 to 6, and each time, the expression (node.toString().equalsIgnoreCase("House")) is false, so it does: tree.setEditable(true). OK - now it gets to node 7, and (node.toString().equalsIgnoreCase("House")) is now true, so it does tree.setEditable(false) - making the entire tree not editable. Finally, it renders nodes 8, 9 & 10, where (node.toString().equalsIgnoreCase("House")) is false again, so it does: tree.setEditable(true), so when it has finished rendering, the entire tree is editable.
That's why it doesn't work. Now, I don't know if you can directlly make only one single node editable or not editable (unless someone else knows different??) One workaround would be to add a listener, and if the user tries to edit your House node, pop up a message telling them not to, or just silently change its value back to House after they have finished (That'll frustrate the hell out of 'em ;-)