if (!option (OPTMENUMOVEOFF) && menu->max <= menu->pagelen) /* less entries than lines */
{
- if (menu->top != 0) {
+ if (menu->top != 0)
+ {
menu->top = 0;
set_option (OPTNEEDREDRAW);
}
}
else
{
- /*
- * If c = menu->pagelen / 2 and menu->pagelen is even, then (obviously):
- *
- * menu->top + menu->pagelen - c == menu->top + c
- *
- * In that case, having an "else if" below leads to what has become known as the
- * indicator break dance effect. Instead of special-casing, we just forget the
- * "else".
- */
-
- if (menu->current < menu->top + c) /* indicator above top threshold */
+ if (option (OPTMENUSCROLL) || (menu->pagelen <= 0) || (c && c <= MenuContext))
{
- if (option (OPTMENUSCROLL) || (menu->pagelen <= 0))
+ if (menu->current < menu->top + c)
menu->top = menu->current - c;
- else
- menu->top -= (menu->pagelen - c) * ((menu->top + menu->pagelen - 1 - menu->current) / (menu->pagelen - c)) - c;
+ if (menu->current >= menu->top + menu->pagelen - c)
+ menu->top = menu->current - menu->pagelen + c + 1;
}
- if (menu->current >= menu->top + menu->pagelen - c) /* indicator below bottom threshold */
+ else
{
- if (option (OPTMENUSCROLL) || (menu->pagelen <= 0))
- menu->top = menu->current - menu->pagelen + c + 1;
- else
- menu->top += (menu->pagelen - c) * ((menu->current - menu->top) / (menu->pagelen - c)) - c;
+ if (menu->current < menu->top + c)
+ menu->top -= (menu->pagelen - c) * ((menu->top + menu->pagelen - 1 - menu->current) / (menu->pagelen - c)) - c;
+ else if (menu->current >= menu->top + menu->pagelen - c)
+ menu->top += (menu->pagelen - c) * ((menu->current - menu->top) / (menu->pagelen - c)) - c;
}
}