/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <draw.h>#include <thread.h>#include <mouse.h>#include <frame.h> void_frdrawtext(Frame *f, Point pt, Image *text, Image *back){	Frbox *b;	int nb;	static int x; 	for(nb=0,b=f->box; nb<f->nbox; nb++, b++){		_frcklinewrap(f, &pt, b);		if(b->nrune >= 0){			stringbg(f->b, pt, text, ZP, f->font, (char*)b->ptr, back, ZP);		}		pt.x += b->wid;	}} static intnbytes(char *s0, int nr){	char *s;	Rune r; 	s = s0;	while(--nr >= 0)		s += chartorune(&r, s);	return s-s0;} voidfrdrawsel(Frame *f, Point pt, ulong p0, ulong p1, int issel){	Image *back, *text; 	if(f->ticked)		frtick(f, frptofchar(f, f->p0), 0); 	if(p0 == p1){		frtick(f, pt, issel);		return;	} 	if(issel){		back = f->cols[HIGH];		text = f->cols[HTEXT];	}else{		back = f->cols[BACK];		text = f->cols[TEXT];	} 	frdrawsel0(f, pt, p0, p1, back, text);} Pointfrdrawsel0(Frame *f, Point pt, ulong p0, ulong p1, Image *back, Image *text){	Frbox *b;	int nb, nr, w, x, trim;	Point qt;	uint p;	char *ptr; 	p = 0;	b = f->box;	trim = 0;	for(nb=0; nb<f->nbox && p<p1; nb++){		nr = b->nrune;		if(nr < 0)			nr = 1;		if(p+nr <= p0)			goto Continue;		if(p >= p0){			qt = pt;			_frcklinewrap(f, &pt, b);			/* fill in the end of a wrapped line */			if(pt.y > qt.y)				draw(f->b, Rect(qt.x, qt.y, f->r.max.x, pt.y), back, nil, qt);		}		ptr = (char*)b->ptr;		if(p < p0){	/* beginning of region: advance into box */			ptr += nbytes(ptr, p0-p);			nr -= (p0-p);			p = p0;		}		trim = 0;		if(p+nr > p1){	/* end of region: trim box */			nr -= (p+nr)-p1;			trim = 1;		}		if(b->nrune<0 || nr==b->nrune)			w = b->wid;		else			w = stringnwidth(f->font, ptr, nr);		x = pt.x+w;		if(x > f->r.max.x)			x = f->r.max.x;		draw(f->b, Rect(pt.x, pt.y, x, pt.y+f->font->height), back, nil, pt);		if(b->nrune >= 0)			stringnbg(f->b, pt, text, ZP, f->font, ptr, nr, back, ZP);		pt.x += w;	    Continue:		b++;		p += nr;	}	/* if this is end of last plain text box on wrapped line, fill to end of line */	if(p1>p0 &&  b>f->box && b<f->box+f->nbox && b[-1].nrune>0 && !trim){		qt = pt;		_frcklinewrap(f, &pt, b);		if(pt.y > qt.y)			draw(f->b, Rect(qt.x, qt.y, f->r.max.x, pt.y), back, nil, qt);	}	return pt;} voidfrredraw(Frame *f){	int ticked;	Point pt; 	if(f->p0 == f->p1){		ticked = f->ticked;		if(ticked)			frtick(f, frptofchar(f, f->p0), 0);		frdrawsel0(f, frptofchar(f, 0), 0, f->nchars, f->cols[BACK], f->cols[TEXT]);		if(ticked)			frtick(f, frptofchar(f, f->p0), 1);		return;	} 	pt = frptofchar(f, 0);	pt = frdrawsel0(f, pt, 0, f->p0, f->cols[BACK], f->cols[TEXT]);	pt = frdrawsel0(f, pt, f->p0, f->p1, f->cols[HIGH], f->cols[HTEXT]);	pt = frdrawsel0(f, pt, f->p1, f->nchars, f->cols[BACK], f->cols[TEXT]);} voidfrtick(Frame *f, Point pt, int ticked){	Rectangle r; 	if(f->ticked==ticked || f->tick==0 || !ptinrect(pt, f->r))		return;	pt.x--;	/* looks best just left of where requested */	r = Rect(pt.x, pt.y, pt.x+FRTICKW, pt.y+f->font->height);	/* can go into left border but not right */	if(r.max.x > f->r.max.x)		r.max.x = f->r.max.x;	if(ticked){		draw(f->tickback, f->tickback->r, f->b, nil, pt);		draw(f->b, r, f->tick, nil, ZP);	}else		draw(f->b, r, f->tickback, nil, ZP);	f->ticked = ticked;} Point_frdraw(Frame *f, Point pt){	Frbox *b;	int nb, n; 	for(b=f->box,nb=0; nb<f->nbox; nb++, b++){		_frcklinewrap0(f, &pt, b);		if(pt.y == f->r.max.y){			f->nchars -= _frstrlen(f, nb);			_frdelbox(f, nb, f->nbox-1);			break;		}		if(b->nrune > 0){			n = _frcanfit(f, pt, b);			if(n == 0)				drawerror(f->display, "_frcanfit==0");			if(n != b->nrune){				_frsplitbox(f, nb, n);				b = &f->box[nb];			}			pt.x += b->wid;		}else{			if(b->bc == '\n'){				pt.x = f->r.min.x;				pt.y+=f->font->height;			}else				pt.x += _frnewwid(f, pt, b);		}	}	return pt;} int_frstrlen(Frame *f, int nb){	int n; 	for(n=0; nb<f->nbox; nb++)		n += NRUNE(&f->box[nb]);	return n;}