sys/src/libframe/frselect.c

   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
  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
  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                 if(!scrled)
 100                         readmouse(mc);
 101                 mp = mc->xy;
 102         }while(mc->buttons == b);
 103 }
 104
 105 void
 106 frselectpaint(Frame *f, Point p0, Point p1, Image *col)
 107 {
 108         int n;
 109         Point q0, q1;
 110
 111         q0 = p0;
 112         q1 = p1;
 113         q0.y += f->font->height;
 114         q1.y += f->font->height;
 115         n = (p1.y-p0.y)/f->font->height;
 116         if(f->b == nil)
 117                 drawerror(f->display, "frselectpaint b==0");
 118         if(p0.y == f->r.max.y)
 119                 return;
 120         if(n == 0)
 121                 draw(f->b, Rpt(p0, q1), col, nil, ZP);
 122         else{
 123                 if(p0.x >= f->r.max.x)
 124                         p0.x = f->r.max.x-1;
 125                 draw(f->b, Rect(p0.x, p0.y, f->r.max.x, q0.y), col, nil, ZP);
 126                 if(n > 1)
 127                         draw(f->b, Rect(f->r.min.x, q0.y, f->r.max.x, p1.y),
 128                                 col, nil, ZP);
 129                 draw(f->b, Rect(f->r.min.x, p1.y, q1.x, q1.y),
 130                         col, nil, ZP);
 131         }
 132 }