HTML in TreeCellRenderer (JLabel) really slow

Hi,
I've used HTML in my TreeCellRenderer to make the node (ie the JLabel) display a formatted text, both bold and italic + an icon. It looks great, but it's really slow. I've run it through JProbe and it seems like the call to label.setText(x) creates thousands of extra objects and is taking a lot of time. Is there a way around this?
I've searched the forums but can't find a soultion. I also found this:
http://developer.java.sun.com/developer/bugParade/bugs/4792592.html
What I want is to be able to change color for each node in the tree plus use bold and italic text within the same label.
/s

I had this problem with setting HTML on all the cell in a JTree.
The problem is caused by the renderer parsing the html and building a view like a JTextArea does. This is what causes the large number of objects to be created. This is done every time the cells are painted which is a big problem when scrolling the tree.
To solve it I extended the DefaultTreeCellRenderer to cache the generated html views as they are created using the client property called "html" as follows:
public class FastHTMLCellRenderer extends DefaultTreeCellRenderer {
    Map views = HashMap();
    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean
             selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        Object view = views.get(value);
        if(view==null) {
            // generate the html for the value
            setText("<html>....." + value + "</html>");
            views.put(value, getClientProperty("html"));
        else {
            putClientProperty("html", view);
}This improves the performance dramatically but has the issue that the views should be removed from the cache when the values are removed from the tree model.
This also applys to JTables and other CellRenderers.

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Message was edited by: Ozzmystro

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annasip,
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Uhhh your English is pretty d.. good. As good as most of us around here. Better than my Finnish...suomi something tu...
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Welcome to Apple Discussions!
Try cleaning up your Mac*:
http://www.macmaps.com/diskfull.html
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http://www.macmaps.com/backup.html
http://www.macmaps.com/directoryfaq.html
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~~~~~~~~~~~~~~~
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