1 #include <u.h> 2 #include <libc.h> 3 #include <draw.h> 4 #include <thread.h> 5 #include <mouse.h> 6 #include <frame.h> 7 8 int 9 frdelete(Frame *f, ulong p0, ulong p1) 10 { 11 Point pt0, pt1, ppt0; 12 Frbox *b; 13 int n0, n1, n; 14 ulong cn1; 15 Rectangle r; 16 int nn0; 17 Image *col; 18 19 if(p0>=f->nchars || p0==p1 || f->b==nil) 20 return 0; 21 if(p1 > f->nchars) 22 p1 = f->nchars; 23 n0 = _frfindbox(f, 0, 0, p0); 24 if(n0 == f->nbox) 25 drawerror(f->display, "off end in frdelete"); 26 n1 = _frfindbox(f, n0, p0, p1); 27 pt0 = _frptofcharnb(f, p0, n0); 28 pt1 = frptofchar(f, p1); 29 if(f->p0 == f->p1) 30 frtick(f, frptofchar(f, f->p0), 0); 31 nn0 = n0; 32 ppt0 = pt0; 33 _frfreebox(f, n0, n1-1); 34 f->modified = 1; 35 36 /* 37 * Invariants: 38 * - pt0 points to beginning, pt1 points to end 39 * - n0 is box containing beginning of stuff being deleted 40 * - n1, b are box containing beginning of stuff to be kept after deletion 41 * - cn1 is char position of n1 42 * - f->p0 and f->p1 are not adjusted until after all deletion is done 43 */ 44 b = &f->box[n1]; 45 cn1 = p1; 46 while(pt1.x!=pt0.x && n1<f->nbox){ 47 _frcklinewrap0(f, &pt0, b); 48 _frcklinewrap(f, &pt1, b); 49 n = _frcanfit(f, pt0, b); 50 if(n==0) 51 drawerror(f->display, "_frcanfit==0"); 52 r.min = pt0; 53 r.max = pt0; 54 r.max.y += f->font->height; 55 if(b->nrune > 0){ 56 if(n != b->nrune){ 57 _frsplitbox(f, n1, n); 58 b = &f->box[n1]; 59 } 60 r.max.x += b->wid; 61 draw(f->b, r, f->b, nil, pt1); 62 cn1 += b->nrune; 63 }else{ 64 r.max.x += _frnewwid0(f, pt0, b); 65 if(r.max.x > f->r.max.x) 66 r.max.x = f->r.max.x; 67 col = f->cols[BACK]; 68 if(f->p0<=cn1 && cn1<f->p1) 69 col = f->cols[HIGH]; 70 draw(f->b, r, col, nil, pt0); 71 cn1++; 72 } 73 _fradvance(f, &pt1, b); 74 pt0.x += _frnewwid(f, pt0, b); 75 f->box[n0++] = f->box[n1++]; 76 b++; 77 } 78 if(n1==f->nbox && pt0.x!=pt1.x) /* deleting last thing in window; must clean up */ 79 frselectpaint(f, pt0, pt1, f->cols[BACK]); 80 if(pt1.y != pt0.y){ 81 Point pt2; 82 83 pt2 = _frptofcharptb(f, 32767, pt1, n1); 84 if(pt2.y > f->r.max.y) 85 drawerror(f->display, "frptofchar in frdelete"); 86 if(n1 < f->nbox){ 87 int q0, q1, q2; 88 89 q0 = pt0.y+f->font->height; 90 q1 = pt1.y+f->font->height; 91 q2 = pt2.y+f->font->height; 92 if(q2 > f->r.max.y) 93 q2 = f->r.max.y; 94 draw(f->b, Rect(pt0.x, pt0.y, pt0.x+(f->r.max.x-pt1.x), q0), 95 f->b, nil, pt1); 96 draw(f->b, Rect(f->r.min.x, q0, f->r.max.x, q0+(q2-q1)), 97 f->b, nil, Pt(f->r.min.x, q1)); 98 frselectpaint(f, Pt(pt2.x, pt2.y-(pt1.y-pt0.y)), pt2, f->cols[BACK]); 99 }else 100 frselectpaint(f, pt0, pt2, f->cols[BACK]); 101 } 102 _frclosebox(f, n0, n1-1); 103 if(nn0>0 && f->box[nn0-1].nrune>=0 && ppt0.x-f->box[nn0-1].wid>=(int)f->r.min.x){ 104 --nn0; 105 ppt0.x -= f->box[nn0].wid; 106 } 107 _frclean(f, ppt0, nn0, n0<f->nbox-1? n0+1 : n0); 108 if(f->p1 > p1) 109 f->p1 -= p1-p0; 110 else if(f->p1 > p0) 111 f->p1 = p0; 112 if(f->p0 > p1) 113 f->p0 -= p1-p0; 114 else if(f->p0 > p0) 115 f->p0 = p0; 116 f->nchars -= p1-p0; 117 if(f->p0 == f->p1) 118 frtick(f, frptofchar(f, f->p0), 1); 119 pt0 = frptofchar(f, f->nchars); 120 n = f->nlines; 121 f->nlines = (pt0.y-f->r.min.y)/f->font->height+(pt0.x>f->r.min.x); 122 return n - f->nlines; 123 } 124