Empty directories are shown as leaf nodes while using JTree to display filesystem

[Chandra Sekar]

Hi,

I'm using JTree to display the contents of the selected directory recursively. Now when an empty directory is present on the filesystem, it is displayed as a leaf node as it does not have any child.

How do I use the parent node icon for empty directories?

[Nathan Pruett]

Are you using any special TreeCellRenderers with your tree? You could display the desired icon using a file.isDirectory() test inside the renderer.

[Chandra Sekar]

I'm not using special tree cell renderer. Using isDirectory is fine, but how do I specify the icon to use?

[Nathan Pruett]

Hmmm... that's why I was asking if you were using any TreeCellRenderers - you'd have to specify that in your own TreeCellRenderer -

Something like -

 
class FileTreeCellRenderer extends DefaultTreeCellRenderer {
 
    public Component getTreeCellRendererComponent(JTree tree,
            Object value, boolean sel, boolean expanded, boolean leaf,
            int row, boolean hasFocus)
    {
        JLabel renderer = (JLabel)super.getTreeCellRendererComponent(
                tree, value, se, expanded, leaf, row, hasFocus);
        File currentFile = (File)value;
        if (currentFile.isDirectory())
        {
            if (expanded)
            {
                renderer.setIcon(openIcon);
            }
            else
            {
                renderer.setIcon(closedIcon);
            }
        }
        else
        {
            renderer.setIcon(leafIcon);
        }
        return renderer;
    }
}

[Chandra Sekar]

Thanks, that clears it for me.