aboutsummaryrefslogtreecommitdiff
path: root/src/libframe/frdelete.c
blob: d7c3f5ea9d24ab8e8db46f196dadd53e47befe6c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
#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;
}