void () { setUI(new BasicListUI() { MouseListener myListener; @Override protected void updateLayoutState() { super.updateLayoutState(); Insets insets = list.getInsets(); int listWidth = list.getWidth() - (insets.left + insets.right); if (listWidth >= cellWidth) { int columnCount = listWidth / cellWidth; cellWidth = (columnCount == 0) ? 1 : listWidth / columnCount; } } @Override protected void installListeners() { addMouseListener(myListener = new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { myBeforeClickSelectedRow = list.getSelectedIndex(); } }); super.installListeners(); } @Override protected void uninstallListeners() { if (myListener != null) { removeMouseListener(myListener); } super.uninstallListeners(); } }); invalidate(); }