ref: ceed9b8853ab7b10e5a9e39704e712bfce53ce8a
dir: /sys/src/libframe/frinsert.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <thread.h> #include <mouse.h> #include <frame.h> #define DELTA 25 #define TMPSIZE 256 static Frame frame; static Point bxscan(Frame *f, Rune *sp, Rune *ep, Point *ppt) { int w, c, nb, delta, nl, nr, rw; Frbox *b; char *s, tmp[TMPSIZE+3]; /* +3 for rune overflow */ uchar *p; frame.r = f->r; frame.b = f->b; frame.font = f->font; frame.maxtab = f->maxtab; frame.nbox = 0; frame.nchars = 0; memmove(frame.cols, f->cols, sizeof frame.cols); delta = DELTA; nl = 0; for(nb=0; sp<ep && nl<=f->maxlines; nb++,frame.nbox++){ if(nb == frame.nalloc){ _frgrowbox(&frame, delta); if(delta < 10000) delta *= 2; } b = &frame.box[nb]; c = *sp; if(c=='\t' || c=='\n'){ b->bc = c; b->wid = 5000; b->minwid = (c=='\n')? 0 : stringwidth(frame.font, " "); b->nrune = -1; if(c=='\n') nl++; frame.nchars++; sp++; }else{ s = tmp; nr = 0; w = 0; while(sp < ep){ c = *sp; if(c=='\t' || c=='\n') break; rw = runetochar(s, sp); if(s+rw >= tmp+TMPSIZE) break; w += runestringnwidth(frame.font, sp, 1); sp++; s += rw; nr++; } *s++ = 0; p = _frallocstr(f, s-tmp); b = &frame.box[nb]; b->ptr = p; memmove(p, tmp, s-tmp); b->wid = w; b->nrune = nr; frame.nchars += nr; } } _frcklinewrap0(f, ppt, &frame.box[0]); return _frdraw(&frame, *ppt); } static void chopframe(Frame *f, Point pt, ulong p, int bn) { Frbox *b, *eb; eb = &f->box[f->nbox]; for(b = &f->box[bn]; b < eb; b++){ _frcklinewrap(f, &pt, b); if(pt.y >= f->r.max.y) break; p += NRUNE(b); _fradvance(f, &pt, b); } f->nchars = p; f->nlines = f->maxlines; if(b < eb) /* BUG */ _frdelbox(f, (int)(b-f->box), f->nbox-1); } void frinsert(Frame *f, Rune *sp, Rune *ep, ulong p0) { Point pt0, pt1, opt0, ppt0, ppt1, pt; Frbox *b; int n, n0, nn0, y; ulong cn0; Image *back, *text; Rectangle r; static struct{ Point pt0, pt1; }*pts; static int nalloc=0; int npts; if(p0>f->nchars || sp==ep || f->b==nil) return; n0 = _frfindbox(f, 0, 0, p0); cn0 = p0; nn0 = n0; pt0 = _frptofcharnb(f, p0, n0); ppt0 = pt0; opt0 = pt0; pt1 = bxscan(f, sp, ep, &ppt0); ppt1 = pt1; if(n0 < f->nbox){ _frcklinewrap(f, &pt0, b = &f->box[n0]); /* for frdrawsel() */ _frcklinewrap0(f, &ppt1, b); } f->modified = 1; /* * ppt0 and ppt1 are start and end of insertion as they will appear when * insertion is complete. pt0 is current location of insertion position * (p0); pt1 is terminal point (without line wrap) of insertion. */ if(f->p0 == f->p1) frtick(f, frptofchar(f, f->p0), 0); /* * Find point where old and new x's line up * Invariants: * pt0 is where the next box (b, n0) is now * pt1 is where it will be after the insertion * If pt1 goes off the rectangle, we can toss everything from there on */ for(b = &f->box[n0],npts=0; pt1.x!=pt0.x && pt1.y!=f->r.max.y && n0<f->nbox; b++,n0++,npts++){ _frcklinewrap(f, &pt0, b); _frcklinewrap0(f, &pt1, b); if(b->nrune > 0){ n = _frcanfit(f, pt1, b); if(n == 0) drawerror(f->display, "_frcanfit==0"); if(n != b->nrune){ _frsplitbox(f, n0, n); b = &f->box[n0]; } } if(npts == nalloc){ pts = realloc(pts, (npts+DELTA)*sizeof(pts[0])); nalloc += DELTA; b = &f->box[n0]; } pts[npts].pt0 = pt0; pts[npts].pt1 = pt1; /* has a text box overflowed off the frame? */ if(pt1.y == f->r.max.y) break; _fradvance(f, &pt0, b); pt1.x += _frnewwid(f, pt1, b); cn0 += NRUNE(b); } if(pt1.y > f->r.max.y) drawerror(f->display, "frinsert pt1 too far"); if(pt1.y==f->r.max.y && n0<f->nbox){ f->nchars -= _frstrlen(f, n0); _frdelbox(f, n0, f->nbox-1); } if(n0 == f->nbox) f->nlines = (pt1.y-f->r.min.y)/f->font->height+(pt1.x>f->r.min.x); else if(pt1.y!=pt0.y){ int q0, q1; y = f->r.max.y; q0 = pt0.y+f->font->height; q1 = pt1.y+f->font->height; f->nlines += (q1-q0)/f->font->height; if(f->nlines > f->maxlines) chopframe(f, ppt1, p0, nn0); if(pt1.y < y){ r = f->r; r.min.y = q1; r.max.y = y; if(q1 < y) draw(f->b, r, f->b, nil, Pt(f->r.min.x, q0)); r.min = pt1; r.max.x = pt1.x+(f->r.max.x-pt0.x); r.max.y = q1; draw(f->b, r, f->b, nil, pt0); } } /* * Move the old stuff down to make room. The loop will move the stuff * between the insertion and the point where the x's lined up. * The draw()s above moved everything down after the point they lined up. */ for((y=pt1.y==f->r.max.y?pt1.y:0),b = &f->box[n0-1]; --npts>=0; --b){ pt = pts[npts].pt1; if(b->nrune > 0){ r.min = pt; r.max = r.min; r.max.x += b->wid; r.max.y += f->font->height; draw(f->b, r, f->b, nil, pts[npts].pt0); /* clear bit hanging off right */ if(npts==0 && pt.y>pt0.y){ /* * first new char is bigger than first char we're * displacing, causing line wrap. ugly special case. */ r.min = opt0; r.max = opt0; r.max.x = f->r.max.x; r.max.y += f->font->height; if(f->p0<=cn0 && cn0<f->p1) /* b+1 is inside selection */ back = f->cols[HIGH]; else back = f->cols[BACK]; draw(f->b, r, back, nil, r.min); }else if(pt.y < y){ r.min = pt; r.max = pt; r.min.x += b->wid; r.max.x = f->r.max.x; r.max.y += f->font->height; if(f->p0<=cn0 && cn0<f->p1) /* b+1 is inside selection */ back = f->cols[HIGH]; else back = f->cols[BACK]; draw(f->b, r, back, nil, r.min); } y = pt.y; cn0 -= b->nrune; }else{ r.min = pt; r.max = pt; r.max.x += b->wid; r.max.y += f->font->height; if(r.max.x >= f->r.max.x) r.max.x = f->r.max.x; cn0--; if(f->p0<=cn0 && cn0<f->p1) /* b is inside selection */ back = f->cols[HIGH]; else back = f->cols[BACK]; draw(f->b, r, back, nil, r.min); y = 0; if(pt.x == f->r.min.x) y = pt.y; } } /* insertion can extend the selection, so the condition here is different */ if(f->p0<p0 && p0<=f->p1){ text = f->cols[HTEXT]; back = f->cols[HIGH]; } else { text = f->cols[TEXT]; back = f->cols[BACK]; } frselectpaint(f, ppt0, ppt1, back); _frdrawtext(&frame, ppt0, text, back); _fraddbox(f, nn0, frame.nbox); for(n=0; n<frame.nbox; n++) f->box[nn0+n] = frame.box[n]; if(nn0>0 && f->box[nn0-1].nrune>=0 && ppt0.x-f->box[nn0-1].wid>=f->r.min.x){ --nn0; ppt0.x -= f->box[nn0].wid; } n0 += frame.nbox; _frclean(f, ppt0, nn0, n0<f->nbox-1? n0+1 : n0); f->nchars += frame.nchars; if(f->p0 >= p0) f->p0 += frame.nchars; if(f->p0 > f->nchars) f->p0 = f->nchars; if(f->p1 >= p0) f->p1 += frame.nchars; if(f->p1 > f->nchars) f->p1 = f->nchars; if(f->p0 == f->p1) frtick(f, frptofchar(f, f->p0), 1); }