libframe/frdelete.c (raw)
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#include <u.h> #include <libc.h> #include <draw.h> #include <mouse.h> #include "frame.h" int frdelete(Frame* f, ulong p0, ulong p1) { Point pt0, pt1, ppt0; Frbox* b; int n0, n1, n, w0; ulong cn1; Rectangle r; int nn0; Image* col; if (p0 >= f->nchars || p0 == p1 || f->b == nil) return 0; if (p1 > f->nchars) p1 = f->nchars; n0 = _frfindbox(f, 0, 0, p0); if (n0 == f->nbox) drawerror(f->display, "off end in frdelete"); n1 = _frfindbox(f, n0, p0, p1); pt0 = _frptofcharnb(f, p0, n0); pt1 = frptofchar(f, p1); if (f->p0 == f->p1) frtick(f, frptofchar(f, f->p0), 0); nn0 = n0; ppt0 = pt0; _frfreebox(f, n0, n1 - 1); f->modified = 1; /* * Invariants: * - pt0 points to beginning, pt1 points to end * - n0 is box containing beginning of stuff being deleted * - n1, b are box containing beginning of stuff to be kept after deletion * - cn1 is char position of n1 * - f->p0 and f->p1 are not adjusted until after all deletion is done */ b = &f->box[n1]; cn1 = p1; while (pt1.x != pt0.x && n1 < f->nbox) { _frcklinewrap0(f, &pt0, b); _frcklinewrap(f, &pt1, b); n = _frcanfit(f, pt0, b); if (n == 0) drawerror(f->display, "_frcanfit==0"); r.min = pt0; r.max = pt0; r.max.y += f->font->height; if (b->nrune > 0) { w0 = b->wid; if (n != b->nrune) { _frsplitbox(f, n1, n); b = &f->box[n1]; } r.max.x += b->wid; draw(f->b, r, f->b, nil, pt1); cn1 += b->nrune; /* blank remainder of line */ r.min.x = r.max.x; r.max.x += w0 - b->wid; if (r.max.x > f->r.max.x) r.max.x = f->r.max.x; draw(f->b, r, f->cols[BACK], nil, r.min); } else { r.max.x += _frnewwid0(f, pt0, b); if (r.max.x > f->r.max.x) r.max.x = f->r.max.x; col = f->cols[BACK]; if (f->p0 <= cn1 && cn1 < f->p1) col = f->cols[HIGH]; draw(f->b, r, col, nil, pt0); cn1++; } _fradvance(f, &pt1, b); pt0.x += _frnewwid(f, pt0, b); f->box[n0++] = f->box[n1++]; b++; } if (n1 == f->nbox && pt0.x != pt1.x) /* deleting last thing in window; must clean up */ frselectpaint(f, pt0, pt1, f->cols[BACK]); if (pt1.y != pt0.y) { Point pt2; pt2 = _frptofcharptb(f, 32767, pt1, n1); if (pt2.y > f->r.max.y) drawerror(f->display, "frptofchar in frdelete"); if (n1 < f->nbox) { int q0, q1, q2; q0 = pt0.y + f->font->height; q1 = pt1.y + f->font->height; q2 = pt2.y + f->font->height; if (q2 > f->r.max.y) q2 = f->r.max.y; draw( f->b, Rect(pt0.x, pt0.y, pt0.x + (f->r.max.x - pt1.x), q0), f->b, nil, pt1); draw( f->b, Rect(f->r.min.x, q0, f->r.max.x, q0 + (q2 - q1)), f->b, nil, Pt(f->r.min.x, q1)); frselectpaint(f, Pt(pt2.x, pt2.y - (pt1.y - pt0.y)), pt2, f->cols[BACK]); } else frselectpaint(f, pt0, pt2, f->cols[BACK]); } _frclosebox(f, n0, n1 - 1); if ( nn0 > 0 && f->box[nn0 - 1].nrune >= 0 && ppt0.x - f->box[nn0 - 1].wid >= (int)f->r.min.x) { --nn0; ppt0.x -= f->box[nn0].wid; } _frclean(f, ppt0, nn0, n0 < f->nbox - 1 ? n0 + 1 : n0); if (f->p1 > p1) f->p1 -= p1 - p0; else if (f->p1 > p0) f->p1 = p0; if (f->p0 > p1) f->p0 -= p1 - p0; else if (f->p0 > p0) f->p0 = p0; f->nchars -= p1 - p0; if (f->p0 == f->p1) frtick(f, frptofchar(f, f->p0), 1); pt0 = frptofchar(f, f->nchars); n = f->nlines; f->nlines = (pt0.y - f->r.min.y) / f->font->height + (pt0.x > f->r.min.x); return n - f->nlines; } |