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
frdelete(Frame * f,ulong p0,ulong p1)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