1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <mouse.h>
5 #include <frame.h>
6 
7 int
8 _frcanfit(Frame *f, Point pt, Frbox *b)
9 {
10 	int left, w, nr;
11 	uchar *p;
12 	Rune r;
13 
14 	left = f->r.max.x-pt.x;
15 	if(b->nrune < 0)
16 		return b->minwid <= left;
17 	if(left >= b->wid)
18 		return b->nrune;
19 	for(nr=0,p=b->ptr; *p; p+=w,nr++){
20 		r = *p;
21 		if(r < Runeself)
22 			w = 1;
23 		else
24 			w = chartorune(&r, (char*)p);
25 		left -= stringnwidth(f->font, (char*)p, 1);
26 		if(left < 0)
27 			return nr;
28 	}
29 	drawerror(f->display, "_frcanfit can't");
30 	return 0;
31 }
32 
33 void
34 _frcklinewrap(Frame *f, Point *p, Frbox *b)
35 {
36 	if((b->nrune<0? b->minwid : b->wid) > f->r.max.x-p->x){
37 		p->x = f->r.min.x;
38 		p->y += f->font->height;
39 	}
40 }
41 
42 void
43 _frcklinewrap0(Frame *f, Point *p, Frbox *b)
44 {
45 	if(_frcanfit(f, *p, b) == 0){
46 		p->x = f->r.min.x;
47 		p->y += f->font->height;
48 	}
49 }
50 
51 void
52 _fradvance(Frame *f, Point *p, Frbox *b)
53 {
54 	if(b->nrune<0 && b->bc=='\n'){
55 		p->x = f->r.min.x;
56 		p->y += f->font->height;
57 	}else
58 		p->x += b->wid;
59 }
60 
61 int
62 _frnewwid(Frame *f, Point pt, Frbox *b)
63 {
64 	b->wid = _frnewwid0(f, pt, b);
65 	return b->wid;
66 }
67 
68 int
69 _frnewwid0(Frame *f, Point pt, Frbox *b)
70 {
71 	int c, x;
72 
73 	c = f->r.max.x;
74 	x = pt.x;
75 	if(b->nrune>=0 || b->bc!='\t')
76 		return b->wid;
77 	if(x+b->minwid > c)
78 		x = pt.x = f->r.min.x;
79 	x += f->maxtab;
80 	x -= (x-f->r.min.x)%f->maxtab;
81 	if(x-pt.x<b->minwid || x>c)
82 		x = pt.x+b->minwid;
83 	return x-pt.x;
84 }
85 
86 void
87 _frclean(Frame *f, Point pt, int n0, int n1)	/* look for mergeable boxes */
88 {
89 	Frbox *b;
90 	int nb, c;
91 
92 	c = f->r.max.x;
93 	for(nb=n0; nb<n1-1; nb++){
94 		b = &f->box[nb];
95 		_frcklinewrap(f, &pt, b);
96 		while(b[0].nrune>=0 && nb<n1-1 && b[1].nrune>=0 && pt.x+b[0].wid+b[1].wid<c){
97 			_frmergebox(f, nb);
98 			n1--;
99 			b = &f->box[nb];
100 		}
101 		_fradvance(f, &pt, &f->box[nb]);
102 	}
103 	for(; nb<f->nbox; nb++){
104 		b = &f->box[nb];
105 		_frcklinewrap(f, &pt, b);
106 		_fradvance(f, &pt, &f->box[nb]);
107 	}
108 	f->lastlinefull = 0;
109 	if(pt.y >= f->r.max.y)
110 		f->lastlinefull = 1;
111 }