ref: a70b93a356662355214f5405edda066786f6dd03
dir: /sys/src/cmd/mothra/libpanel/pack.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
#include <panel.h>
#include "pldefs.h"
int pl_max(int a, int b){
return a>b?a:b;
}
Point pl_sizesibs(Panel *p){
Point s;
if(p==0) return Pt(0,0);
s=pl_sizesibs(p->next);
switch(p->flags&PACK){
case PACKN:
case PACKS:
s.x=pl_max(s.x, p->sizereq.x);
s.y+=p->sizereq.y;
break;
case PACKE:
case PACKW:
s.x+=p->sizereq.x;
s.y=pl_max(s.y, p->sizereq.y);
break;
}
return s;
}
/*
* Compute the requested size of p and its descendants.
*/
void pl_sizereq(Panel *p){
Panel *cp;
Point maxsize;
maxsize=Pt(0,0);
for(cp=p->child;cp;cp=cp->next){
pl_sizereq(cp);
if(cp->sizereq.x>maxsize.x) maxsize.x=cp->sizereq.x;
if(cp->sizereq.y>maxsize.y) maxsize.y=cp->sizereq.y;
}
for(cp=p->child;cp;cp=cp->next){
if(cp->flags&MAXX) cp->sizereq.x=maxsize.x;
if(cp->flags&MAXY) cp->sizereq.y=maxsize.y;
}
p->childreq=pl_sizesibs(p->child);
p->sizereq=addpt(addpt(p->getsize(p, p->childreq), p->ipad), p->pad);
if(p->flags&FIXEDX) p->sizereq.x=p->fixedsize.x;
if(p->flags&FIXEDY) p->sizereq.y=p->fixedsize.y;
}
Point pl_getshare(Panel *p){
Point share;
if(p==0) return Pt(0,0);
share=pl_getshare(p->next);
if(p->flags&EXPAND) switch(p->flags&PACK){
case PACKN:
case PACKS:
if(share.x==0) share.x=1;
share.y++;
break;
case PACKE:
case PACKW:
share.x++;
if(share.y==0) share.y=1;
break;
}
return share;
}
/*
* Set the sizes and rectangles of p and its descendants, given their requested sizes.
*/
void pl_setrect(Panel *p, Point ul, Point avail){
Point space, newul, newspace, slack, share;
int l;
Panel *c;
p->size=subpt(p->sizereq, p->pad);
ul=addpt(ul, divpt(p->pad, 2));
avail=subpt(avail, p->pad);
if(p->size.x>avail.x)
p->size.x = avail.x;
if(p->size.y>avail.y)
p->size.y = avail.y;
if(p->flags&(FILLX|EXPAND)) p->size.x=avail.x;
if(p->flags&(FILLY|EXPAND)) p->size.y=avail.y;
switch(p->flags&PLACE){
case PLACECEN: ul.x+=(avail.x-p->size.x)/2; ul.y+=(avail.y-p->size.y)/2; break;
case PLACES: ul.x+=(avail.x-p->size.x)/2; ul.y+= avail.y-p->size.y ; break;
case PLACEE: ul.x+= avail.x-p->size.x ; ul.y+=(avail.y-p->size.y)/2; break;
case PLACEW: ul.y+=(avail.y-p->size.y)/2; break;
case PLACEN: ul.x+=(avail.x-p->size.x)/2; break;
case PLACENE: ul.x+= avail.x-p->size.x ; break;
case PLACENW: break;
case PLACESE: ul.x+= avail.x-p->size.x ; ul.y+= avail.y-p->size.y ; break;
case PLACESW: ul.y+= avail.y-p->size.y ; break;
}
p->r=Rpt(ul, addpt(ul, p->size));
space=p->size;
p->childspace(p, &ul, &space);
slack=subpt(space, p->childreq);
share=pl_getshare(p->child);
for(c=p->child;c;c=c->next){
if(c->flags&IGNORE) continue;
if(c->flags&EXPAND){
switch(c->flags&PACK){
case PACKN:
case PACKS:
c->sizereq.x+=slack.x;
l=slack.y/share.y;
c->sizereq.y+=l;
slack.y-=l;
--share.y;
break;
case PACKE:
case PACKW:
l=slack.x/share.x;
c->sizereq.x+=l;
slack.x-=l;
--share.x;
c->sizereq.y+=slack.y;
break;
}
}
switch(c->flags&PACK){
case PACKN:
newul=Pt(ul.x, ul.y+c->sizereq.y);
newspace=Pt(space.x, space.y-c->sizereq.y);
pl_setrect(c, ul, Pt(space.x, c->sizereq.y));
break;
case PACKW:
newul=Pt(ul.x+c->sizereq.x, ul.y);
newspace=Pt(space.x-c->sizereq.x, space.y);
pl_setrect(c, ul, Pt(c->sizereq.x, space.y));
break;
case PACKS:
newul=ul;
newspace=Pt(space.x, space.y-c->sizereq.y);
pl_setrect(c, Pt(ul.x, ul.y+space.y-c->sizereq.y),
Pt(space.x, c->sizereq.y));
break;
case PACKE:
newul=ul;
newspace=Pt(space.x-c->sizereq.x, space.y);
pl_setrect(c, Pt(ul.x+space.x-c->sizereq.x, ul.y),
Pt(c->sizereq.x, space.y));
break;
}
ul=newul;
space=newspace;
}
}
void plpack(Panel *p, Rectangle where){
pl_sizereq(p);
pl_setrect(p, where.min, subpt(where.max, where.min));
}
/*
* move an already-packed panel so that p->r=raddp(p->r, d)
*/
void plmove(Panel *p, Point d){
if(strcmp(p->kind, "edit") == 0) /* sorry */
plemove(p, d);
p->r=rectaddpt(p->r, d);
for(p=p->child;p;p=p->next) plmove(p, d);
}