Thread: JTable Column Sizing

I am having some difficulty resizing columns in a JTable. The code I am using works just fine in I have the Look and Feel set to Nimbus, but any other Look and Feel does not set the column widths based on the code below. Infact I get different results depending on what font has been set.

 
	private void updateColWidths()
	{
		try
		{
			TableColumnModel columnModel = table1.getColumnModel();
			for (int col = 0; col < table1.getColumnCount(); col ++)
			{
				int colWidth = 0;
				for (int row = 0; row < table1.getRowCount(); row ++)
				{
					Component comp = table1.prepareRenderer(table1.getCellRenderer(row, col), row, col);
					colWidth = Math.max(colWidth, comp.getPreferredSize().width);
				}
 
				TableColumn column = columnModel.getColumn(col);
				TableCellRenderer headerRenderer = column.getHeaderRenderer();
                if (headerRenderer == null) {
                    headerRenderer = table1.getTableHeader().getDefaultRenderer();
                }
                Object headerValue = column.getHeaderValue();
                Component headerComp = headerRenderer.getTableCellRendererComponent(table1, headerValue, false, false, 0, col);
                colWidth = Math.max(colWidth, headerComp.getPreferredSize().width);
				column.setPreferredWidth(colWidth);
			}
		}
		 catch(ClassCastException e) {}
	}

Here are some screen shots of the different look and feels' using Verdana 16 as the font.

Nimbus nimbus.jpg

Metal metal.jpg

Motif motif.jpg

GTK+ GTK.jpg

Any ideas what might be causing this? I'd just leave this with Nimbus, but my Mac users ( it always the Mac users that stir-up trouble ) would like to use their default Look and Feel.

I have found a solution which leads me to believe that get.PreferedSzie()width is not computing the proper width based on Look and Feel and the selected font. By adding a constant > 1 to colWidth when setting the preferred width all the columen are not properly sized. I selected a value of 5 as this provides a bit of a margin and makes the display look nice and clean.