From 15a8fe2cf2b16af8739a7ec2b64b5c5f184161b8 Mon Sep 17 00:00:00 2001 From: Louis Burda Date: Thu, 16 Dec 2021 13:48:13 +0100 Subject: Implemented list navigation and other fixes --- listnav.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 listnav.c (limited to 'listnav.c') diff --git a/listnav.c b/listnav.c new file mode 100644 index 0000000..707a973 --- /dev/null +++ b/listnav.c @@ -0,0 +1,43 @@ +#include "listnav.h" +#include "util.h" + +#include + +void +listnav_init(struct listnav *nav) +{ + memset(nav, 0, sizeof(struct listnav)); +} + +void +listnav_update_bounds(struct listnav *nav, int min, int max) +{ + nav->min = min; + nav->max = max; + nav->wmin = MAX(nav->wmin, nav->min); + nav->wmax = MIN(nav->wmin + nav->wlen, nav->max); + nav->sel = MIN(MAX(nav->sel, nav->wmin), nav->wmax - 1); +} + +void +listnav_update_wlen(struct listnav *nav, int wlen) +{ + nav->wlen = wlen; + nav->wmax = MIN(nav->wmin + nav->wlen, nav->max); + nav->sel = MIN(MAX(nav->sel, nav->wmin), nav->wmax - 1); +} + +void +listnav_update_sel(struct listnav *nav, int sel) +{ + nav->sel = MAX(MIN(sel, nav->max - 1), nav->min); + + if (nav->sel >= nav->wmax) { + nav->wmax = nav->sel + 1; + nav->wmin = MAX(nav->min, nav->wmax - nav->wlen); + } else if (nav->sel < nav->wmin) { + nav->wmin = nav->sel; + nav->wmax = MIN(nav->wmin + nav->wlen, nav->max); + } +} + -- cgit v1.2.3-71-gd317