libframe/frinsert.c (raw)
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#include <u.h> #include <libc.h> #include <draw.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; for (b = &f->box[bn];; b++) { if (b >= &f->box[f->nbox]) drawerror(f->display, "endofframe"); _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 < &f->box[f->nbox]) /* 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 *col, *tcol; 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 */ col = f->cols[HIGH]; else col = f->cols[BACK]; draw(f->b, r, col, 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 */ col = f->cols[HIGH]; else col = f->cols[BACK]; draw(f->b, r, col, 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 */ col = f->cols[HIGH]; tcol = f->cols[HTEXT]; } else { col = f->cols[BACK]; tcol = f->cols[TEXT]; } draw(f->b, r, col, 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) { col = f->cols[HIGH]; tcol = f->cols[HTEXT]; } else { col = f->cols[BACK]; tcol = f->cols[TEXT]; } frselectpaint(f, ppt0, ppt1, col); _frdrawtext(&frame, ppt0, tcol, col); _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); } |