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 static
9 int
region(int a,int b)10 region(int a, int b)
11 {
12 if(a < b)
13 return -1;
14 if(a == b)
15 return 0;
16 return 1;
17 }
18
19 void
frselect(Frame * f,Mousectl * mc)20 frselect(Frame *f, Mousectl *mc) /* when called, button 1 is down */
21 {
22 ulong p0, p1, q;
23 Point mp, pt0, pt1, qt;
24 int reg, b, scrled;
25
26 mp = mc->xy;
27 b = mc->buttons;
28
29 f->modified = 0;
30 frdrawsel(f, frptofchar(f, f->p0), f->p0, f->p1, 0);
31 p0 = p1 = frcharofpt(f, mp);
32 f->p0 = p0;
33 f->p1 = p1;
34 pt0 = frptofchar(f, p0);
35 pt1 = frptofchar(f, p1);
36 frdrawsel(f, pt0, p0, p1, 1);
37 reg = 0;
38 do{
39 scrled = 0;
40 if(f->scroll){
41 if(mp.y < f->r.min.y){
42 (*f->scroll)(f, -(f->r.min.y-mp.y)/(int)f->font->height-1);
43 p0 = f->p1;
44 p1 = f->p0;
45 scrled = 1;
46 }else if(mp.y > f->r.max.y){
47 (*f->scroll)(f, (mp.y-f->r.max.y)/(int)f->font->height+1);
48 p0 = f->p0;
49 p1 = f->p1;
50 scrled = 1;
51 }
52 if(scrled){
53 if(reg != region(p1, p0))
54 q = p0, p0 = p1, p1 = q; /* undo the swap that will happen below */
55 pt0 = frptofchar(f, p0);
56 pt1 = frptofchar(f, p1);
57 reg = region(p1, p0);
58 }
59 }
60 q = frcharofpt(f, mp);
61 if(p1 != q){
62 if(reg != region(q, p0)){ /* crossed starting point; reset */
63 if(reg > 0)
64 frdrawsel(f, pt0, p0, p1, 0);
65 else if(reg < 0)
66 frdrawsel(f, pt1, p1, p0, 0);
67 p1 = p0;
68 pt1 = pt0;
69 reg = region(q, p0);
70 if(reg == 0)
71 frdrawsel(f, pt0, p0, p1, 1);
72 }
73 qt = frptofchar(f, q);
74 if(reg > 0){
75 if(q > p1)
76 frdrawsel(f, pt1, p1, q, 1);
77 else if(q < p1)
78 frdrawsel(f, qt, q, p1, 0);
79 }else if(reg < 0){
80 if(q > p1)
81 frdrawsel(f, pt1, p1, q, 0);
82 else
83 frdrawsel(f, qt, q, p1, 1);
84 }
85 p1 = q;
86 pt1 = qt;
87 }
88 f->modified = 0;
89 if(p0 < p1) {
90 f->p0 = p0;
91 f->p1 = p1;
92 }
93 else {
94 f->p0 = p1;
95 f->p1 = p0;
96 }
97 if(scrled)
98 (*f->scroll)(f, 0);
99 flushimage(f->display, 1);
100 if(!scrled)
101 readmouse(mc);
102 mp = mc->xy;
103 }while(mc->buttons == b);
104 }
105
106 void
frselectpaint(Frame * f,Point p0,Point p1,Image * col)107 frselectpaint(Frame *f, Point p0, Point p1, Image *col)
108 {
109 int n;
110 Point q0, q1;
111
112 q0 = p0;
113 q1 = p1;
114 q0.y += f->font->height;
115 q1.y += f->font->height;
116 n = (p1.y-p0.y)/f->font->height;
117 if(f->b == nil)
118 drawerror(f->display, "frselectpaint b==0");
119 if(p0.y == f->r.max.y)
120 return;
121 if(n == 0)
122 draw(f->b, Rpt(p0, q1), col, nil, ZP);
123 else{
124 if(p0.x >= f->r.max.x)
125 p0.x = f->r.max.x-1;
126 draw(f->b, Rect(p0.x, p0.y, f->r.max.x, q0.y), col, nil, ZP);
127 if(n > 1)
128 draw(f->b, Rect(f->r.min.x, q0.y, f->r.max.x, p1.y),
129 col, nil, ZP);
130 draw(f->b, Rect(f->r.min.x, p1.y, q1.x, q1.y),
131 col, nil, ZP);
132 }
133 }
134