Custom JTable

Question

Hi, I need to get a JTable to display a JPanel in each of it's cells, with the JPanel being a chosen colour for each individual cell. Also some of the JPanels may also need to contain an instance of a Canvas item in them. Any ideas?? So far I can't even get the JPanel to show up let alone my custom JPanel or Canvas item.
Cheers,
Matt.

Answer 1

I think you are a bit lost.
Here we go:
Why do you need to display an JPanel in each cell?
What do you want your table to display?
java.awt.Canvas usually are not used with Swing. JPanel has itself replaced the position of Canvas, so use a JPanel for anything you would have used Canvas for.
Now to presumed answers from presumed questions:
1) I'll need to paint background differently for each cell in an JTable, what do I do?
You have a multitude of options, I will present two of them.
I presume you have a way of actually telling which colour should be used as background based upon the data in the tablemodel.
Version 1:
Make your own cell-renderer. In it is getTableCellRendererComponent, query nessecary data and set the correct and appropriate colour.
This can be easily done with a wrapper.
Example:
public class WrapperTableCellRenderer implements TableCellRenderer
  private TableCellRenderer tcr = null;
  public WrapperTableCellRenderer( TableCellRenderer tcr )
    this.tcr = tcr;
  public Component getTableCellRendererComponent(......)
     Component c = tcr.getTableCellRendererComponent(......);
     if( data.isThisGreen() )
        c.setBackground( Color.GREEN );
     return c;
}This you can easily use by just doing the following in your code:
JTable jt = new JTable();
jt.setCellRenderer( new WrapperTableCellRenderer( jt.getCellRenderer() ) );Alternative number two is to override the 'prepareRenderer(...)' in your JTable and do modifications there as well.
2) I'll need to paint customised shapes instead of text in my JTable, how do I do it?
This time you definiatly have to make your own TableCellRenderer that returns your JPanel that paints the customised shapes.
Regards,
Peter Norell