eleni.mutantstargoat.com Git - winnie/blob - src/mouse.cc

   1 #include <errno.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 #include <fcntl.h>
   7 #include <sys/ioctl.h>
   8 #include <termios.h>
   9 #include <unistd.h>
  10
  11 #include "geom.h"
  12 #include "gfx.h"
  13 #include "mouse.h"
  14
  15 #define BN_LEFT         1
  16 #define BN_RIGHT        2
  17 #define BN_MIDDLE       4
  18
  19
  20 static int dev_fd = -1; // file descriptor for /dev/psaux
  21 static Rect bounds;
  22 static int pointer_x, pointer_y;
  23 static int bnstate;
  24
  25 bool init_mouse()
  26 {
  27         if((dev_fd = open("/dev/psaux", O_RDONLY)) == -1) {
  28                 fprintf(stderr, "Cannot open /dev/psaux : %s\n", strerror(errno));
  29                 return false;
  30         }
  31
  32         set_mouse_bounds(get_screen_size());
  33         return true;
  34 }
  35
  36 void destroy_mouse()
  37 {
  38         if(dev_fd != -1) {
  39                 close(dev_fd);
  40                 dev_fd = -1;
  41         }
  42 }
  43
  44 void set_mouse_bounds(const Rect &rect)
  45 {
  46         bounds = rect;
  47 }
  48
  49 int get_mouse_fd()
  50 {
  51         return dev_fd;
  52 }
  53
  54 void process_mouse_event()
  55 {
  56         /* TODO:
  57          * - read all pending events from mouse fd (use O_NONBLOCK so that
  58          *   read will return -1 when there are no more events instead of blocking).
  59          */
  60
  61         int prev_state = bnstate;
  62         int prev_x = pointer_x;
  63         int prev_y = pointer_y;
  64
  65         if(read_mouse() == -1) {
  66                 return;
  67         }
  68
  69         /* - process each event and update the pointer and button state
  70          * - send each pointer move and button press/release to the topmost window
  71          *   with the pointer on it.
  72          */
  73 }
  74
  75 void get_pointer_pos(int *x, int *y)
  76 {
  77         *x = pointer_x;
  78         *y = pointer_y;
  79 }
  80
  81 int get_button_state(int bn)
  82 {
  83         return bnstate;
  84 }
  85
  86 int get_button(int bn)
  87 {
  88         if(bn < 0 || bn >= 3) {
  89                 return 0;
  90         }
  91         return (bnstate & (1 << bn)) != 0;
  92 }
  93
  94
  95 int read_mouse()
  96 {
  97         int rd;
  98         signed char state[3] = {0, 0, 0};
  99
 100         if((rd = read(dev_fd, state, 3)) == -1) {
 101                 fprintf(stderr, "Unable to get mouse state : %s\n", strerror(errno));
 102                 return -1;
 103         }
 104
 105         bnstate = state[0] & 7;
 106         pointer_x += state[1];
 107         pointer_y -= state[2];
 108
 109         if(pointer_x < bounds.x) {
 110                 pointer_x = bounds.x;
 111         }
 112
 113         if(pointer_y < bounds.y) {
 114                 pointer_y = bounds.y;
 115         }
 116
 117         if(pointer_x > bounds.x + bounds.width - 1) {
 118                 pointer_x = bounds.x + bounds.width - 1;
 119         }
 120
 121         if(pointer_y > bounds.y + bounds.height - 1) {
 122                 pointer_y = bounds.y + bounds.height - 1;
 123         }
 124
 125         return 0;
 126 }