JTable change cell background at mouse click - after release change background back?

Question

my question is, how to solve following problem:

If i click on a cell in a JTable, i want to change its background. If i release the mousebutton, i want the backgroun

Answer 1

For doing it in the visual realm you need

• a MouseListener which sets some state in cell-coordinates on pressed and resets that state on released
• a PropertyChangeListener listeneng to that state which repaints the cell on change
• a custom renderer which sets a custom background for the cell that is flagged

some code for the listeners

    MouseListener l = new MouseAdapter() {

        /** 
         * @inherited 

         */
        @Override
        public void mousePressed(MouseEvent e) {
            JTable table = (JTable) e.getComponent();
            int col = table.columnAtPoint(e.getPoint());
            int row = table.rowAtPoint(e.getPoint());
            if (col < 0 || row < 0) {
                table.putClientProperty("pressedCell", null);
            } else {
                table.putClientProperty("pressedCell", new Point(col, row));
            }
        }

        /** 
         * @inherited 

         */
        @Override
        public void mouseReleased(MouseEvent e) {
            ((JTable) e.getComponent()).putClientProperty("pressedCell", null);
        }

    };
    table.addMouseListener(l);
    PropertyChangeListener property = new PropertyChangeListener() {

        @Override
        public void propertyChange(PropertyChangeEvent evt) {
            JTable table = (JTable) evt.getSource();
            Point cell = evt.getNewValue() != null ? 
                    (Point) evt.getNewValue() : (Point) evt.getOldValue();
            if (cell != null) table.repaint(table.getCellRect(cell.y, cell.x, false));        
        }

    };
    table.addPropertyChangeListener("pressedCell", property);

Highlighting the cell in SwingX (cant resist :-)

    HighlightPredicate predicate = new HighlightPredicate() {

        @Override
        public boolean isHighlighted(Component renderer, ComponentAdapter adapter) {
            Point p = (Point) adapter.getComponent().getClientProperty("pressedCell");
            return p != null && p.x == adapter.column && p.y == adapter.row;

        }
    };
    table.addHighlighter(new ColorHighlighter(predicate, Color.YELLOW, null, Color.YELLOW, null));

For core Swing, either implement a custom TableCellRenderer or subclass the JTable and override prepareRenderer to set the background color according to the cell flag, as explained in Rob's Table Row Rendering