JTable automatically scroll cell to view when tabbing out of view

/**
     * When tabbing out of the view, scroll the selected cell to the closest edge of the view.
     * If a tab or mouse click is within the view, no scroll will happen
     * @param rowIndex the row of the selected cell
     * @param vColIndex the column of the selected cell
     */
    public void scrollCellToView(int rowIndex, int vColIndex) {
        if (!(this.getParent() instanceof JViewport)) {
            return;
        }
        JViewport viewport = (JViewport) this.getParent();
        Rectangle rect = this.getCellRect(rowIndex, vColIndex, true);
        Rectangle viewRect = viewport.getViewRect();
     
        int x = viewRect.x;
        int y = viewRect.y;
     
        if (rect.x >= viewRect.x && rect.x <= (viewRect.x + viewRect.width - rect.width)){
         
        } else if (rect.x < viewRect.x){
            x = rect.x;
        } else if (rect.x > (viewRect.x + viewRect.width - rect.width)) {
            x = rect.x - viewRect.width + rect.width;
        }
     
        if (rect.y >= viewRect.y && rect.y <= (viewRect.y + viewRect.height - rect.height)){
         
        } else if (rect.y < viewRect.y){
            y = rect.y;
        } else if (rect.y > (viewRect.y + viewRect.height - rect.height)){
            y = rect.y - viewRect.height + rect.height;
        }
     
        viewport.setViewPosition(new Point(x,y));
    }

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