ref: eae58edb5a6f912d3fd06c96e01499ba46f730da
dir: /sys/src/cmd/mothra/libpanel/scrollbar.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <event.h> #include <panel.h> #include "pldefs.h" typedef struct Scrollbar Scrollbar; struct Scrollbar{ int dir; /* HORIZ or VERT */ int lo, hi; /* setting, in screen coordinates */ int buttons; /* saved mouse buttons for transmittal to scrollee */ Rectangle interior; Point minsize; }; #define SBWID 8 /* should come from draw.c? */ void pl_drawscrollbar(Panel *p){ Scrollbar *sp; sp=p->data; sp->interior=pl_outline(p->b, p->r, SUP); /* SUP was p->state */ pl_scrollupd(p->b, sp->interior, sp->lo, sp->hi); } int pl_hitscrollbar(Panel *g, Mouse *m){ int oldstate, pos, len, dy; Point ul, size; Scrollbar *sp; sp=g->data; ul=g->r.min; size=subpt(g->r.max, g->r.min); pl_interior(g->state, &ul, &size); oldstate=g->state; if(!(g->flags & USERFL) && (m->buttons&OUT || !ptinrect(m->xy, g->r))){ m->buttons&=~OUT; g->state=UP; goto out; } if(sp->dir==HORIZ){ pos=m->xy.x-ul.x; len=size.x; } else{ pos=m->xy.y-ul.y; len=size.y; } if(pos<0) pos=0; else if(pos>len) pos=len; if(m->buttons&7){ g->state=DOWN; sp->buttons=m->buttons; switch(m->buttons){ case 1: dy=pos*(sp->hi-sp->lo)/len; pl_scrollupd(g->b, sp->interior, sp->lo-dy, sp->hi-dy); break; case 2: if(g->scrollee && g->scrollee->scroll) g->scrollee->scroll(g->scrollee, sp->dir, m->buttons, pos, len); break; case 4: dy=pos*(sp->hi-sp->lo)/len; pl_scrollupd(g->b, sp->interior, sp->lo+dy, sp->hi+dy); break; } } else{ if(!(sp->buttons&2) && g->state==DOWN && g->scrollee && g->scrollee->scroll) g->scrollee->scroll(g->scrollee, sp->dir, sp->buttons, pos, len); g->state=UP; } out: if(oldstate!=g->state) pldraw(g, g->b); return g->state==DOWN; } void pl_typescrollbar(Panel *p, Rune c){ USED(p, c); } Point pl_getsizescrollbar(Panel *p, Point children){ USED(children); return pl_boxsize(((Scrollbar *)p->data)->minsize, p->state); } void pl_childspacescrollbar(Panel *p, Point *ul, Point *size){ USED(p, ul, size); } /* * Arguments lo, hi and len are in the scrollee's natural coordinates */ void pl_setscrollbarscrollbar(Panel *p, int lo, int hi, int len){ Point ul, size; int mylen; Scrollbar *sp; sp=p->data; ul=p->r.min; size=subpt(p->r.max, p->r.min); mylen=sp->dir==HORIZ?size.x:size.y; if(len==0) len=1; sp->lo=lo*mylen/len; sp->hi=hi*mylen/len; if(sp->lo<0) sp->lo=0; if(sp->lo>=mylen) sp->hi=mylen-1; if(sp->hi<=sp->lo) sp->hi=sp->lo+1; if(sp->hi>mylen) sp->hi=mylen; pldraw(p, p->b); } int pl_priscrollbar(Panel *, Point){ return PRI_SCROLLBAR; } void plinitscrollbar(Panel *v, int flags){ Scrollbar *sp; sp=v->data; v->flags=flags|LEAF; v->pri=pl_priscrollbar; v->state=UP; v->draw=pl_drawscrollbar; v->hit=pl_hitscrollbar; v->type=pl_typescrollbar; v->getsize=pl_getsizescrollbar; v->childspace=pl_childspacescrollbar; v->setscrollbar=pl_setscrollbarscrollbar; switch(flags&PACK){ case PACKN: case PACKS: sp->dir=HORIZ; sp->minsize=Pt(0, SBWID); v->flags|=FILLX; break; case PACKE: case PACKW: sp->dir=VERT; sp->minsize=Pt(SBWID, 0); v->flags|=FILLY; break; } sp->lo=0; sp->hi=0; v->kind="scrollbar"; } Panel *plscrollbar(Panel *parent, int flags){ Panel *v; v=pl_newpanel(parent, sizeof(Scrollbar)); plinitscrollbar(v, flags); return v; }