JTree cell renderer: how to fill whole row?

Question

hi,
i'm trying to make a tree cell renderer that renders at default height, but fills the horizontal width of the tree (e.g. with a JLabel with a custom background color). I'm working on the theory that in order to do this you need to change the preferred size of the component used to stamp the image at render time.
The problem is that the preferred width then needs to be set to a value that depends on the context of the particular node (e.g. a deeply nested child node will be further to the right than the root node).
I can't seem to find a method to say where the rendering starts though - does anyone know a way?
(also if not then would setting the width to some astronimcal value break anything?)
thanks,
asjf

Answer 1

Try this one, it will higlight the background and foreground colors of entire rows.
Oscar
     class TableRenderer
          extends DefaultTableCellRenderer
          implements ListCellRenderer
          private boolean focused = true;
          private JLabel renderer;
          public TableRenderer()
               super();
               renderer = new JLabel();
               renderer.setOpaque(true);
          public Component getListCellRendererComponent(
               JList list,
               Object value,
               int index,
               boolean isSelected,
               boolean cellHasFocus)
               return renderer;
          public Component getTableCellRendererComponent(
               JTable table,
               Object value,
               boolean isSelected,
               boolean hasFocus,
               int row,
               int column)
               renderer =
                    (JLabel) super.getTableCellRendererComponent(
                         table,
                         value,
                         isSelected,
                         hasFocus,
                         row,
                         column);
               /* Make the Labels border empty and indented */
               setBorder(BorderFactory.createEmptyBorder(0, 5, 0, 0));
               /* This is used to create alternate row colors */
               Color bgColor = Color.white;
               if (row % 2 == 0)
                    bgColor = new Color(237, 243, 254);
               /* if the table has focus and the row is selected use these colors */
               if (table.hasFocus() && table.getSelectedRow() == row)
                    table.setSelectionForeground(Color.WHITE);
                    table.setSelectionBackground(new Color(101, 137, 178));
               /* if the table has not the focus but the row is selected use these colors */
               else if (
                    table.hasFocus() == false && table.getSelectedRow() == row)
                    table.setSelectionBackground(new Color(196, 196, 194));
               /* if not use the standard color */
               else
                    renderer.setBackground(bgColor);
                    table.setSelectionForeground(SystemColor.textText);
               if (value instanceof ColorData)
                    ColorData cvalue = (ColorData) value;
                    setForeground(cvalue.color);
                    setText(cvalue.data.toString());
                            /* Set the Labels value */
               setText(String.valueOf(value));
               return renderer;
     }