frdelete.c 3.0 KB

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