git.mutantstargoat.com Git - winnie/blob - src/fbdev/mouse.cc

   1 #ifdef WINNIE_FBDEV
   2 #include <errno.h>
   3 #include <limits.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 #include <fcntl.h>
   9 #include <sys/ioctl.h>
  10 #include <termios.h>
  11 #include <unistd.h>
  12
  13 #include "geom.h"
  14 #include "gfx.h"
  15 #include "mouse.h"
  16 #include "window.h"
  17 #include "wm.h"
  18
  19 #define BN_LEFT         1
  20 #define BN_RIGHT        2
  21 #define BN_MIDDLE       4
  22
  23 static int read_mouse();
  24
  25 static int dev_fd = -1; // file descriptor for /dev/psaux
  26 static Rect bounds;
  27 static int pointer_x, pointer_y;
  28 static int bnstate;
  29
  30 bool init_mouse()
  31 {
  32         if((dev_fd = open("/dev/psaux", O_RDONLY | O_NONBLOCK)) == -1) {
  33                 fprintf(stderr, "Cannot open /dev/psaux : %s\n", strerror(errno));
  34                 return false;
  35         }
  36
  37         set_mouse_bounds(get_screen_size());
  38         return true;
  39 }
  40
  41 void destroy_mouse()
  42 {
  43         if(dev_fd != -1) {
  44                 close(dev_fd);
  45                 dev_fd = -1;
  46         }
  47 }
  48
  49 void set_mouse_bounds(const Rect &rect)
  50 {
  51         bounds = rect;
  52 }
  53
  54 int get_mouse_fd()
  55 {
  56         return dev_fd;
  57 }
  58
  59 void process_mouse_event()
  60 {
  61         /* TODO:
  62          * - read all pending events from mouse fd (use O_NONBLOCK so that
  63          *   read will return -1 when there are no more events instead of blocking).
  64          */
  65
  66         int prev_state = bnstate;
  67         int prev_x = pointer_x;
  68         int prev_y = pointer_y;
  69
  70         if(read_mouse() == -1) {
  71                 return;
  72         }
  73
  74         Window *top = wm->get_window_at_pos(pointer_x, pointer_y);
  75         if(top) {
  76                 wm->set_focused_window(top);
  77         }
  78         else {
  79                 wm->set_focused_window(0);
  80         }
  81
  82          /* - send each pointer move and button press/release to the topmost window
  83          *   with the pointer on it.
  84          */
  85
  86         int dx = pointer_x - prev_x;
  87         int dy = pointer_y - prev_y;
  88
  89         if((dx || dy) && top) {
  90                 MouseMotionFuncType motion_callback = top->get_mouse_motion_callback();
  91                 if(motion_callback) {
  92                         Rect rect = top->get_absolute_rect();
  93                         motion_callback(top, pointer_x - rect.x, pointer_y - rect.y);
  94                 }
  95         }
  96
  97         MouseButtonFuncType button_callback;
  98         if((bnstate != prev_state) && top && (button_callback = top->get_mouse_button_callback())) {
  99                 int num_bits = sizeof bnstate * CHAR_BIT;
 100                 for(int i=0; i<num_bits; i++) {
 101                         int s = (bnstate >> i) & 1;
 102                         int prev_s = (prev_state >> i) & 1;
 103                         if(s != prev_s) {
 104                                 Rect rect = top->get_absolute_rect();
 105                                 button_callback(top, i, s, pointer_x - rect.x, pointer_y - rect.y);
 106                         }
 107                 }
 108         }
 109 }
 110
 111 void get_pointer_pos(int *x, int *y)
 112 {
 113         *x = pointer_x;
 114         *y = pointer_y;
 115 }
 116
 117 int get_button_state()
 118 {
 119         return bnstate;
 120 }
 121
 122 int get_button(int bn)
 123 {
 124         if(bn < 0 || bn >= 3) {
 125                 return 0;
 126         }
 127         return (bnstate & (1 << bn)) != 0;
 128 }
 129
 130 static int read_mouse()
 131 {
 132         int rd;
 133         signed char state[3] = {0, 0, 0};
 134
 135         if((rd = read(dev_fd, state, 3)) == -1) {
 136                 fprintf(stderr, "Unable to get mouse state : %s\n", strerror(errno));
 137                 return -1;
 138         }
 139
 140         bnstate = state[0] & 7;
 141         pointer_x += state[1];
 142         pointer_y -= state[2];
 143
 144         if(pointer_x < bounds.x) {
 145                 pointer_x = bounds.x;
 146         }
 147
 148         if(pointer_y < bounds.y) {
 149                 pointer_y = bounds.y;
 150         }
 151
 152         if(pointer_x > bounds.x + bounds.width - 1) {
 153                 pointer_x = bounds.x + bounds.width - 1;
 154         }
 155
 156         if(pointer_y > bounds.y + bounds.height - 1) {
 157                 pointer_y = bounds.y + bounds.height - 1;
 158         }
 159
 160         return 0;
 161 }
 162 #endif // WINNIE_FBDEV