Getting the default TableCellRenderer

Question

Hello,
I need to get the default TableCellRender for a TableColumn. However, method getTableCellRender(TableColumn c) returns null if the the TableColumn is using the default TableCellRenderer. Is there any way to get my hands on the default TableCellRenderer?
Thank you
Elana

Answer 1

Hi,
TableColumnModel does not know anything about renderers. I use getCellRenderer of the JTable which contains the given TableModel. But the java api says that the the default value for the cellRederer variable is Null - which indicates that the Table is using the default renderer. I need to get that renderer somehow.
Here is my code
          public int getPreferredWidthForColumn(TableColumn tc, JTable table){
               int hw = columnHeaderWidth(tc, table),
               cw = widestCellInColumn(tc, table);
               return hw > cw? hw:cw;
          private int columnHeaderWidth(TableColumn tc, JTable table){
               TableCellRenderer renderer = tc.getHeaderRenderer();
               Component comp = renderer.getTableCellRendererComponent(table, tc.getHeaderValue(), false, false, 0, 0);
               return comp.getPreferredSize().width;
          private int widestCellInColumn(TableColumn col, JTable table) {
               int c = col.getModelIndex(), width = 0, maxw = 0;
               for (int i = 0; i<table.getRowCount(); ++i) {
                    TableCellRenderer renderer = table.getCellRenderer(i, c);
                    Component comp = renderer.getTableCellRendererComponent(table, table.getValueAt(i, c), false, false, i, c);
                    width = comp.getPreferredSize().width;
                    maxw = width > maxw ? width:maxw;
               return maxw;
This was taken from the Graphic Java 2 - mastering the JFC - verbatim..
Thank you