🚀 go-pugleaf

Niall,

My table will function more or less as the old DOS character screen used to
do and it will display a diagram that my app will build one "cell" at a
time.  Now and then I will need to "clear" the screen.  Can you show me how
I would do that using the sort of hash table you describe?

thanks,

James

"Niall Pemberton" <Niall.Pemberton@btinternet.com> wrote in message
news:3a4fb895_1@dnews...
> James,
>
> your table cell renderer is strange...I'm not an expert but I don't think
> you need a setValue() method in it ... you need to implement a
> getTableCellRendererComponent() method as below, from your earlier post
you
> can determine the cell coordinates which are passed as arguments to the
> method. Otherwise your PcCharacter could be a class which contains the
> character value and colurs associated with it.
>
> public class PcCellRenderer extends DefaultTableCellRenderer {
>
>  private JLabel blankLabel;
>  private JLabel charLabel;
>  private PcCharacter c;
>
>  public Component getTableCellRendererComponent(JTable table, Object obj,
>      boolean isSelected, boolean hasFocus, int row, int column) {
>
>     if (obj == null)
>         return blankLabel;
>
>      c = (PcCharacter)obj;
>     charLabel.setText(c.getValue());
>     charLabel.setForeground(c.getForeground());
>     charLabel.setBackground(c.getBackground());
>     return charLabel;
>
>  }
> }
>
> On the subject of initialising the values, you don't have to do it. Set up
> your own Table Model as below, using a HashMap to only store values when
you
> actually have one:
>
>
> public abstract class PcCellModel extends AbstractTableModel {
>
>   private Map objectMatrix = new HashMap();
>   private Point objectIndex = new Point(0,0);
>
>   protected int maxCol = 55;
>   protected int maxRow = 25;
>
>   public PcCellModel () {
>   }
>
>   public PcCellModel (int row, int col) {
>     maxRow = row;
>     maxCol = col;
>   }
>
>   public Object getValueAt(int row, int col) {
>     objectIndex.x = row;
>     objectIndex.y = col;
>
>     if (objectMatrix.get(objectIndex) == null)
>       return null;
>
>     return (PcCharacter)objectMatrix.get(objectIndex);
>   }
>
>   public void setValueAt(Object setObject, int row, int col) {
>     if (setObject == null) {
>       objectMatrix.remove(new Point(row, col));
>     }
>     else {
>       maxCol = Math.max(col, maxCol);
>       maxRow = Math.max(row, maxRow);
>       objectMatrix.put(new Point(row, col), setObject);
>     }
>   }
>
>   public int getRowCount() {
>     return maxRow;
>   }
>   public int getColumnCount() {
>     return maxCol;
>   }
>   public int getMaxColumn() {
>     return maxCol;
>   }
>   public int getMaxRow() {
>     return maxRow;
>   }
>
>   public boolean isCellEditable(int row, int col) {
>     return false;
>   }
>
> }
>
> I kind of cobbled this together but I hope it helps.
>
> Niall
>
>