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

   1 #include <errno.h>
   2 #include <limits.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6
   7 #include <fcntl.h>
   8 #include <sys/ioctl.h>
   9 #include <termios.h>
  10 #include <unistd.h>
  11
  12 #include "geom.h"
  13 #include "gfx.h"
  14 #include "mouse.h"
  15 #include "window.h"
  16 #include "wm.h"
  17
  18 #define BN_LEFT         1
  19 #define BN_RIGHT        2
  20 #define BN_MIDDLE       4
  21
  22
  23 static int dev_fd = -1; // file descriptor for /dev/psaux
  24 static Rect bounds;
  25 static int pointer_x, pointer_y;
  26 static int bnstate;
  27
  28 bool init_mouse()
  29 {
  30         if((dev_fd = open("/dev/psaux", O_RDONLY | O_NONBLOCK)) == -1) {
  31                 fprintf(stderr, "Cannot open /dev/psaux : %s\n", strerror(errno));
  32                 return false;
  33         }
  34
  35         set_mouse_bounds(get_screen_size());
  36         return true;
  37 }
  38
  39 void destroy_mouse()
  40 {
  41         if(dev_fd != -1) {
  42                 close(dev_fd);
  43                 dev_fd = -1;
  44         }
  45 }
  46
  47 void set_mouse_bounds(const Rect &rect)
  48 {
  49         bounds = rect;
  50 }
  51
  52 int get_mouse_fd()
  53 {
  54         return dev_fd;
  55 }
  56
  57 void process_mouse_event()
  58 {
  59         /* TODO:
  60          * - read all pending events from mouse fd (use O_NONBLOCK so that
  61          *   read will return -1 when there are no more events instead of blocking).
  62          */
  63
  64         int prev_state = bnstate;
  65         int prev_x = pointer_x;
  66         int prev_y = pointer_y;
  67
  68         if(read_mouse() == -1) {
  69                 return;
  70         }
  71
  72         unsigned char *fb = get_framebuffer();
  73         fb += (bounds.width * pointer_y + pointer_x) * 4;
  74         fb[0] = 0;
  75         fb[1] = 0;
  76         fb[2] = 0;
  77
  78         //printf("pointer (x, y) = (%d, %d)\r\n", pointer_x, pointer_y);
  79
  80         Window *top = wm->get_window_at_pos(pointer_x, pointer_y);
  81         if(top) {
  82                 wm->set_focused_window(top);
  83         }
  84         else {
  85                 wm->set_focused_window(0);
  86                 return;
  87         }
  88
  89          /* - send each pointer move and button press/release to the topmost window
  90          *   with the pointer on it.
  91          */
  92
  93         int dx = pointer_x - prev_x;
  94         int dy = pointer_y - prev_y;
  95
  96         if(dx || dy) {
  97                 MouseMotionFuncType motion_callback = top->get_mouse_motion_callback();
  98                 if(motion_callback) {
  99                         Rect rect = top->get_rect();
 100                         motion_callback(top, pointer_x - rect.x, pointer_y - rect.y);
 101                 }
 102         }
 103
 104         MouseButtonFuncType button_callback = top->get_mouse_button_callback();
 105         if(button_callback && (bnstate != prev_state)) {
 106                 int num_bits = sizeof bnstate * CHAR_BIT;
 107                 for(int i=0; i<num_bits; i++) {
 108                         int s = (bnstate >> i) & 1;
 109                         int prev_s = (prev_state >> i) & 1;
 110                         if(s != prev_s) {
 111                                 button_callback(top, i, s);
 112                         }
 113                 }
 114         }
 115 }
 116
 117 void get_pointer_pos(int *x, int *y)
 118 {
 119         *x = pointer_x;
 120         *y = pointer_y;
 121 }
 122
 123 int get_button_state(int bn)
 124 {
 125         return bnstate;
 126 }
 127
 128 int get_button(int bn)
 129 {
 130         if(bn < 0 || bn >= 3) {
 131                 return 0;
 132         }
 133         return (bnstate & (1 << bn)) != 0;
 134 }
 135
 136
 137 int read_mouse()
 138 {
 139         int rd;
 140         signed char state[3] = {0, 0, 0};
 141
 142         if((rd = read(dev_fd, state, 3)) == -1) {
 143                 fprintf(stderr, "Unable to get mouse state : %s\n", strerror(errno));
 144                 return -1;
 145         }
 146
 147         bnstate = state[0] & 7;
 148         pointer_x += state[1];
 149         pointer_y -= state[2];
 150
 151         if(pointer_x < bounds.x) {
 152                 pointer_x = bounds.x;
 153         }
 154
 155         if(pointer_y < bounds.y) {
 156                 pointer_y = bounds.y;
 157         }
 158
 159         if(pointer_x > bounds.x + bounds.width - 1) {
 160                 pointer_x = bounds.x + bounds.width - 1;
 161         }
 162
 163         if(pointer_y > bounds.y + bounds.height - 1) {
 164                 pointer_y = bounds.y + bounds.height - 1;
 165         }
 166
 167         return 0;
 168 }