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package javaapplication2;
import javax.swing.table.*;
import javax.swing.plaf.basic.*;
import java.awt.*;
import javax.swing.*;

public class CTUI extends BasicTableUI {
 public void paint(Graphics g, JComponent c) {
  Rectangle r = g.getClipBounds();
//  int firstRow = table.rowAtPoint(new Point(0, r.y));
//  int lastRow = table.rowAtPoint(new Point(0, r.y + r.height));
  int firstCol = table.columnAtPoint( new Point( r.x , 0 ) );
  int lastCol = table.columnAtPoint(new Point( r.x + r.width, 0 ));
  // -1 is a flag that the ending point is outside the table
//  if (lastRow < 0)
//   lastRow = table.getRowCount() - 1;
  if (lastCol < 0)
   lastCol = table.getColumnCount() - 1;
  for (int i = firstCol; i <= lastCol; i++)
   paintCol(i, g);
 } 
 private void paintCol(int col, Graphics g) {
  Rectangle r = g.getClipBounds();
  for (int i = 0; i < table.getRowCount(); i++) {
   Rectangle r1 = table.getCellRect( i, col, true);
   if (r1.intersects(r)) // at least a part is visible
   {
    int sk = ((CTable) table).map.visibleCell( i, col );
    paintCell( sk, col, g, r1);
    // increment the column counter
    i += ((CTable) table).map.span( sk, col ) - 1;
   }
  }
 }

 private void paintCell(int row, int column, Graphics g, Rectangle area) {
  int verticalMargin = table.getRowMargin();
  int horizontalMargin = table.getColumnModel().getColumnMargin();

  Color c = g.getColor();
  g.setColor(table.getGridColor());
  g.drawRect(area.x, area.y, area.width - 1, area.height - 1);
  g.setColor(c);

  area.setBounds(area.x + horizontalMargin / 2, area.y + verticalMargin
    / 2, area.width - horizontalMargin, area.height
    - verticalMargin);

  if (table.isEditing() && table.getEditingRow() == row
    && table.getEditingColumn() == column) {
   Component component = table.getEditorComponent();
   component.setBounds(area);
   component.validate();
  } 
  else 
  {
   TableCellRenderer renderer = table.getCellRenderer(row, column);
   Component component = table.prepareRenderer(renderer, row, column);
   if (component.getParent() == null)
    rendererPane.add(component);
   rendererPane.paintComponent(g, component, table, area.x, area.y,
     area.width, area.height, true);
  }
 }
}