Scrollpane

/**
     * Initializes the scrollpane on which the spreadsheet is placed.
     * @return the scrollpane.
     */

    public JScrollPane getJScrollPane()
    {
        if (jScrollPane == null)
        {
            jScrollPane = new JScrollPane();
            jScrollPane.addComponentListener(new java.awt.event.
                                             ComponentAdapter()
            {
                public void componentResized(
                        java.awt.event.ComponentEvent e)
                {
                    repainttable();
                    if (getSelectedColumnCount() == 0 &&
                        getSelectedRowCount() == 0)
                    {
                        if ((getColumnCount() > 1) && (getRowCount() > 1))
                        {
                            setColumnSelectionInterval(0, 0);
                            setRowSelectionInterval(0, 0);
                        }
                    }
                }
            });
            jScrollPane.getHorizontalScrollBar().addAdjustmentListener(
                    new SSScrollAdjListener(this));
            jScrollPane.getVerticalScrollBar().addAdjustmentListener(new
                    SSScrollAdjListener(this));
            jScrollPane.setRowHeaderView(getViewPort());
            jScrollPane.setCorner(ScrollPaneConstants.UPPER_LEFT_CORNER,
                                  getRowHeader().getTableHeader());
            jScrollPane.setViewportView(this);
        }

        return jScrollPane;
    }


    /**
     * Routine for AdjustmentListener of ScrollPane which is used for
     * supporting isCellVisible mode
     * @param isVerticalScrollbar VerticalScrollBar involved set true
     *                            or HorizontalScrollBar invloved set false
     */

    public void scrollpaneRoutine(boolean isVerticalScrollbar)
    {
        if (isCellVisible)
        {
            if (isVerticalScrollbar)
            {
                int dif = jScrollPane.getVerticalScrollBar().getMaximum() -
                          jScrollPane.getVerticalScrollBar().getValue() -
                          jScrollPane.getVerticalScrollBar().getHeight();
                if (dif == 0)
                {
                    this.addRow();
                }
                else if (Vindex > jScrollPane.getVerticalScrollBar().getValue())
                {
                    int i = rowAtPoint(SwingUtilities.convertPoint(jScrollPane,
                            100, jScrollPane.getHeight(), this));
                    int lastrow = 0;
                    int[] rows = getSelectedRows();
                    lastrow = (rows.length > 0) ? rows[rows.length - 1] :
                              lastrow;
                    i = (i < lastrow) ? lastrow : i;
                    if (i > 0)
                    {
                        while (getRowCount() > i + 1)
                        {
                            if (checkRowDataExist(getRowCount() - 1) == false)
                            {
                                model.removeRow(this, getRowCount() - 1);
                            }
                            else
                            {
                                break;
                            }
                        }
                    }
                }
            }
            else
            {
                int dif = jScrollPane.getHorizontalScrollBar().getMaximum() -
                          jScrollPane.getHorizontalScrollBar().getValue() -
                          jScrollPane.getHorizontalScrollBar().getWidth();
                if (dif == 0)
                {
                    int c[] = getSelectedColumns();
                    int r[] = getSelectedRows();
                    addColumn();
                    addSelectionInterval(r, c);
                    getTableHeader().repaint();
                }
                else if (Hindex >
                         jScrollPane.getHorizontalScrollBar().getValue())
                {
                    int i = columnAtPoint(SwingUtilities.convertPoint(
                            jScrollPane,
                            jScrollPane.getWidth(), 50, this));
                    int lastcol = 0;
                    int[] cols = getSelectedColumns();
                    lastcol = (cols.length > 0) ? cols[cols.length - 1] :
                              lastcol;
                    i = (i < lastcol) ? lastcol : i;
                    if (i > 0)
                    {
                        while (getColumnCount() > i + 1)
                        {
                            if (checkColumnDataExist(getColumnCount() - 1) ==
                                false)
                            {
                                model.removeColumn(this, getColumnCount() - 1);
                            }
                            else
                            {
                                break;
                            }
                        }
                    }
                }
            }
            Hindex = jScrollPane.getHorizontalScrollBar().getValue();
            Vindex = jScrollPane.getVerticalScrollBar().getValue();
        }
    }