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Thread: JTable Column Sizing

  1. #1
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    Lightbulb 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.


  2. #2
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    Default Re: JTable Column Sizing

    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.

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