带有ImageIcon列的Java JTable TableCellRenderer

Question

I have a table with a custom table model which has two columns. Column 0 is an ImageIcon class, and Column 1 is a String class.

public Class<?> getColumnClass(int col) {
    if (col == 0) {
        return ImageIcon.class;
    } else {
        return String.class;
    }
}

When I define a new TableCellRenderer class to be added to the columns so I can style the cells, it overwrites the ImageIcon class and sets it to a String.

public class CustomTableCellRenderer extends DefaultTableCellRenderer
{
    public Component getTableCellRendererComponent (JTable table, Object obj, boolean isSelected,     boolean hasFocus, int row, int 
    column)
    {
    Component cell = super.getTableCellRendererComponent(table, 
      obj, isSelected, hasFocus, row, column);
    if(isSelected)
     cell.setBackground(Color.BLUE);
    return cell;
    }
}

Any ideas on how to fix this?

My mistake, it is sort of hidden:

When I define a new TableCellRenderer class to be added to the columns so I can style the cells, it overwrites the ImageIcon class and sets it to a String.

So the problem is that, when I define this TableCellRenderer class to style my table, the ImageIcon columns in my table turn to Strings like "File:..." instead of the actual icon.

Answer 1

There is no need to create a custom renderer. JTable allready supports a default renderer for columns containing an Icon. All you need to do is override the getColumnClass() method, which you appear to be doing.

Answer 2

Another possible solution is to just set the icon yourself. I'm not sure if this is the best solution, but it works:

   public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
            boolean hasFocus, int row, int column) {
      Component cell = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row,
               column);
      ((JLabel)cell).setIcon((Icon)value);
      ((JLabel)cell).setText("");
      ((JLabel)cell).setHorizontalAlignment(JLabel.CENTER);
      if (isSelected) {
         cell.setBackground(Color.blue);
      } else {
         cell.setBackground(null);
      }
      return cell;
   }