xref: /plan9/sys/src/libframe/frdraw.c (revision 8f5875f3e9b20916b4c52ad4336922bc8653eb7b)
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 void
_frdrawtext(Frame * f,Point pt,Image * text,Image * back)9 _frdrawtext(Frame *f, Point pt, Image *text, Image *back)
10 {
11 	Frbox *b;
12 	int nb;
13 	static int x;
14 
15 	for(nb=0,b=f->box; nb<f->nbox; nb++, b++){
16 		_frcklinewrap(f, &pt, b);
17 		if(b->nrune >= 0){
18 			stringbg(f->b, pt, text, ZP, f->font, (char*)b->ptr, back, ZP);
19 		}
20 		pt.x += b->wid;
21 	}
22 }
23 
24 static int
nbytes(char * s0,int nr)25 nbytes(char *s0, int nr)
26 {
27 	char *s;
28 	Rune r;
29 
30 	s = s0;
31 	while(--nr >= 0)
32 		s += chartorune(&r, s);
33 	return s-s0;
34 }
35 
36 void
frdrawsel(Frame * f,Point pt,ulong p0,ulong p1,int issel)37 frdrawsel(Frame *f, Point pt, ulong p0, ulong p1, int issel)
38 {
39 	Image *back, *text;
40 
41 	if(f->ticked)
42 		frtick(f, frptofchar(f, f->p0), 0);
43 
44 	if(p0 == p1){
45 		frtick(f, pt, issel);
46 		return;
47 	}
48 
49 	if(issel){
50 		back = f->cols[HIGH];
51 		text = f->cols[HTEXT];
52 	}else{
53 		back = f->cols[BACK];
54 		text = f->cols[TEXT];
55 	}
56 
57 	frdrawsel0(f, pt, p0, p1, back, text);
58 }
59 
60 Point
frdrawsel0(Frame * f,Point pt,ulong p0,ulong p1,Image * back,Image * text)61 frdrawsel0(Frame *f, Point pt, ulong p0, ulong p1, Image *back, Image *text)
62 {
63 	Frbox *b;
64 	int nb, nr, w, x, trim;
65 	Point qt;
66 	uint p;
67 	char *ptr;
68 
69 	p = 0;
70 	b = f->box;
71 	trim = 0;
72 	for(nb=0; nb<f->nbox && p<p1; nb++){
73 		nr = b->nrune;
74 		if(nr < 0)
75 			nr = 1;
76 		if(p+nr <= p0)
77 			goto Continue;
78 		if(p >= p0){
79 			qt = pt;
80 			_frcklinewrap(f, &pt, b);
81 			/* fill in the end of a wrapped line */
82 			if(pt.y > qt.y)
83 				draw(f->b, Rect(qt.x, qt.y, f->r.max.x, pt.y), back, nil, qt);
84 		}
85 		ptr = (char*)b->ptr;
86 		if(p < p0){	/* beginning of region: advance into box */
87 			ptr += nbytes(ptr, p0-p);
88 			nr -= (p0-p);
89 			p = p0;
90 		}
91 		trim = 0;
92 		if(p+nr > p1){	/* end of region: trim box */
93 			nr -= (p+nr)-p1;
94 			trim = 1;
95 		}
96 		if(b->nrune<0 || nr==b->nrune)
97 			w = b->wid;
98 		else
99 			w = stringnwidth(f->font, ptr, nr);
100 		x = pt.x+w;
101 		if(x > f->r.max.x)
102 			x = f->r.max.x;
103 		draw(f->b, Rect(pt.x, pt.y, x, pt.y+f->font->height), back, nil, pt);
104 		if(b->nrune >= 0)
105 			stringnbg(f->b, pt, text, ZP, f->font, ptr, nr, back, ZP);
106 		pt.x += w;
107 	    Continue:
108 		b++;
109 		p += nr;
110 	}
111 	/* if this is end of last plain text box on wrapped line, fill to end of line */
112 	if(p1>p0 &&  b>f->box && b<f->box+f->nbox && b[-1].nrune>0 && !trim){
113 		qt = pt;
114 		_frcklinewrap(f, &pt, b);
115 		if(pt.y > qt.y)
116 			draw(f->b, Rect(qt.x, qt.y, f->r.max.x, pt.y), back, nil, qt);
117 	}
118 	return pt;
119 }
120 
121 void
frredraw(Frame * f)122 frredraw(Frame *f)
123 {
124 	int ticked;
125 	Point pt;
126 
127 	if(f->p0 == f->p1){
128 		ticked = f->ticked;
129 		if(ticked)
130 			frtick(f, frptofchar(f, f->p0), 0);
131 		frdrawsel0(f, frptofchar(f, 0), 0, f->nchars, f->cols[BACK], f->cols[TEXT]);
132 		if(ticked)
133 			frtick(f, frptofchar(f, f->p0), 1);
134 		return;
135 	}
136 
137 	pt = frptofchar(f, 0);
138 	pt = frdrawsel0(f, pt, 0, f->p0, f->cols[BACK], f->cols[TEXT]);
139 	pt = frdrawsel0(f, pt, f->p0, f->p1, f->cols[HIGH], f->cols[HTEXT]);
140 	pt = frdrawsel0(f, pt, f->p1, f->nchars, f->cols[BACK], f->cols[TEXT]);
141 }
142 
143 void
frtick(Frame * f,Point pt,int ticked)144 frtick(Frame *f, Point pt, int ticked)
145 {
146 	Rectangle r;
147 
148 	if(f->ticked==ticked || f->tick==0 || !ptinrect(pt, f->r))
149 		return;
150 	pt.x--;	/* looks best just left of where requested */
151 	r = Rect(pt.x, pt.y, pt.x+FRTICKW, pt.y+f->font->height);
152 	/* can go into left border but not right */
153 	if(r.max.x > f->r.max.x)
154 		r.max.x = f->r.max.x;
155 	if(ticked){
156 		draw(f->tickback, f->tickback->r, f->b, nil, pt);
157 		draw(f->b, r, f->tick, nil, ZP);
158 	}else
159 		draw(f->b, r, f->tickback, nil, ZP);
160 	f->ticked = ticked;
161 }
162 
163 Point
_frdraw(Frame * f,Point pt)164 _frdraw(Frame *f, Point pt)
165 {
166 	Frbox *b;
167 	int nb, n;
168 
169 	for(b=f->box,nb=0; nb<f->nbox; nb++, b++){
170 		_frcklinewrap0(f, &pt, b);
171 		if(pt.y == f->r.max.y){
172 			f->nchars -= _frstrlen(f, nb);
173 			_frdelbox(f, nb, f->nbox-1);
174 			break;
175 		}
176 		if(b->nrune > 0){
177 			n = _frcanfit(f, pt, b);
178 			if(n == 0)
179 				drawerror(f->display, "_frcanfit==0");
180 			if(n != b->nrune){
181 				_frsplitbox(f, nb, n);
182 				b = &f->box[nb];
183 			}
184 			pt.x += b->wid;
185 		}else{
186 			if(b->bc == '\n'){
187 				pt.x = f->r.min.x;
188 				pt.y+=f->font->height;
189 			}else
190 				pt.x += _frnewwid(f, pt, b);
191 		}
192 	}
193 	return pt;
194 }
195 
196 int
_frstrlen(Frame * f,int nb)197 _frstrlen(Frame *f, int nb)
198 {
199 	int n;
200 
201 	for(n=0; nb<f->nbox; nb++)
202 		n += NRUNE(&f->box[nb]);
203 	return n;
204 }
205