@Override
public void execute(final Object algn) {
// updates the visible area
final int p = scroll.pos();
final int y = rend.cursorY();
final int m = y + rend.fontHeight() * 3 - getHeight();
if (p < m || p > y) {
final int align = (Integer) algn;
scroll.pos(align == 0 ? y : align == 1 ? y - getHeight() / 2 : m);
}
rend.repaint();
}
