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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/libframe/frutil.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <thread.h>
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#include <mouse.h>
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#include <frame.h>
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int
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_frcanfit(Frame *f, Point pt, Frbox *b)
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{
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	int left, w, nr;
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	uchar *p;
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	Rune r;
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	left = f->r.max.x-pt.x;
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	if(b->nrune < 0)
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		return b->minwid <= left;
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	if(left >= b->wid)
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		return b->nrune;
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	for(nr=0,p=b->ptr; *p; p+=w,nr++){
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		r = *p;
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		if(r < Runeself)
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			w = 1;
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		else
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			w = chartorune(&r, (char*)p);
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		left -= stringnwidth(f->font, (char*)p, 1);
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		if(left < 0)
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			return nr;
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	}
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	drawerror(f->display, "_frcanfit can't");
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	return 0;
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}
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void
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_frcklinewrap(Frame *f, Point *p, Frbox *b)
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{
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	if((b->nrune<0? b->minwid : b->wid) > f->r.max.x-p->x){
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		p->x = f->r.min.x;
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		p->y += f->font->height;
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	}
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}
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void
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_frcklinewrap0(Frame *f, Point *p, Frbox *b)
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{
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	if(_frcanfit(f, *p, b) == 0){
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		p->x = f->r.min.x;
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		p->y += f->font->height;
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	}
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}
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void
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_fradvance(Frame *f, Point *p, Frbox *b)
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{
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	if(b->nrune<0 && b->bc=='\n'){
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		p->x = f->r.min.x;
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		p->y += f->font->height;
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	}else
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		p->x += b->wid;
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}
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int
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_frnewwid(Frame *f, Point pt, Frbox *b)
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{
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	b->wid = _frnewwid0(f, pt, b);
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	return b->wid;
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}
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int
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_frnewwid0(Frame *f, Point pt, Frbox *b)
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{
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	int c, x;
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	c = f->r.max.x;
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	x = pt.x;
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	if(b->nrune>=0 || b->bc!='\t')
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		return b->wid;
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	if(x+b->minwid > c)
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		x = pt.x = f->r.min.x;
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	x += f->maxtab;
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	x -= (x-f->r.min.x)%f->maxtab;
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	if(x-pt.x<b->minwid || x>c)
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		x = pt.x+b->minwid;
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	return x-pt.x;
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}
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void
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_frclean(Frame *f, Point pt, int n0, int n1)	/* look for mergeable boxes */
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{
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	Frbox *b;
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	int nb, c;
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	c = f->r.max.x;
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	for(nb=n0; nb<n1-1; nb++){
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		b = &f->box[nb];
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		_frcklinewrap(f, &pt, b);
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		while(b[0].nrune>=0 && nb<n1-1 && b[1].nrune>=0 && pt.x+b[0].wid+b[1].wid<c){
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			_frmergebox(f, nb);
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			n1--;
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			b = &f->box[nb];
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		}
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		_fradvance(f, &pt, &f->box[nb]);
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	}
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	for(; nb<f->nbox; nb++){
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		b = &f->box[nb];
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		_frcklinewrap(f, &pt, b);
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		_fradvance(f, &pt, &f->box[nb]);
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	}
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	f->lastlinefull = 0;
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	if(pt.y >= f->r.max.y)
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		f->lastlinefull = 1;
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}