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

   1 /*
   2 winnie - an experimental window system
   3
   4 Copyright (C) 2013 Eleni Maria Stea
   5
   6 This program is free software: you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation, either version 3 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 Author: Eleni Maria Stea <elene.mst@gmail.com>
  20 */
  21
  22 #ifdef WINNIE_FBDEV
  23 #include <errno.h>
  24 #include <limits.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include <fcntl.h>
  30 #include <sys/ioctl.h>
  31 #include <termios.h>
  32 #include <unistd.h>
  33
  34 #include "geom.h"
  35 #include "gfx.h"
  36 #include "mouse.h"
  37 #include "shalloc.h"
  38 #include "window.h"
  39 #include "wm.h"
  40
  41 #define BN_LEFT         1
  42 #define BN_RIGHT        2
  43 #define BN_MIDDLE       4
  44
  45 static int read_mouse();
  46
  47 struct Mouse {
  48         int dev_fd;
  49         Rect bounds;
  50         int pointer_x;
  51         int pointer_y;
  52         int bnstate;
  53 };
  54
  55 static Mouse *mouse;
  56
  57 bool init_mouse()
  58 {
  59         if(!(mouse = (Mouse*)sh_malloc(sizeof *mouse))) {
  60                 return false;
  61         }
  62         memset(mouse, 0, sizeof *mouse);
  63
  64         mouse->dev_fd = -1;
  65
  66         if((mouse->dev_fd = open("/dev/psaux", O_RDONLY | O_NONBLOCK)) == -1) {
  67                 fprintf(stderr, "Cannot open /dev/psaux : %s\n", strerror(errno));
  68                 return false;
  69         }
  70
  71         set_mouse_bounds(get_screen_size());
  72         return true;
  73 }
  74
  75 void destroy_mouse()
  76 {
  77         if(mouse->dev_fd != -1) {
  78                 close(mouse->dev_fd);
  79                 mouse->dev_fd = -1;
  80         }
  81         sh_free(mouse);
  82 }
  83
  84 void set_mouse_bounds(const Rect &rect)
  85 {
  86         mouse->bounds = rect;
  87 }
  88
  89 int get_mouse_fd()
  90 {
  91         return mouse->dev_fd;
  92 }
  93
  94 void process_mouse_event()
  95 {
  96         /* TODO:
  97          * - read all pending events from mouse fd (use O_NONBLOCK so that
  98          *   read will return -1 when there are no more events instead of blocking).
  99          */
 100
 101         int prev_state = mouse->bnstate;
 102         int prev_x = mouse->pointer_x;
 103         int prev_y = mouse->pointer_y;
 104
 105         if(read_mouse() == -1) {
 106                 return;
 107         }
 108
 109         Window *top;
 110         if(!(top = wm->get_grab_window())) {
 111                 top = wm->get_window_at_pos(mouse->pointer_x, mouse->pointer_y);
 112                 if(top) {
 113                         wm->set_focused_window(top);
 114                 }
 115                 else {
 116                         wm->set_focused_window(0);
 117                 }
 118         }
 119
 120          /* - send each pointer move and button press/release to the topmost window
 121          *   with the pointer on it.
 122          */
 123
 124         int dx = mouse->pointer_x - prev_x;
 125         int dy = mouse->pointer_y - prev_y;
 126
 127         if((dx || dy) && top) {
 128                 MouseMotionFuncType motion_callback = top->get_mouse_motion_callback();
 129                 if(motion_callback) {
 130                         Rect rect = top->get_absolute_rect();
 131                         motion_callback(top, mouse->pointer_x - rect.x, mouse->pointer_y - rect.y);
 132                 }
 133         }
 134
 135         MouseButtonFuncType button_callback;
 136         if((mouse->bnstate != prev_state) && top && (button_callback = top->get_mouse_button_callback())) {
 137                 int num_bits = sizeof mouse->bnstate * CHAR_BIT;
 138                 for(int i=0; i<num_bits; i++) {
 139                         int s = (mouse->bnstate >> i) & 1;
 140                         int prev_s = (prev_state >> i) & 1;
 141                         if(s != prev_s) {
 142                                 Rect rect = top->get_absolute_rect();
 143                                 button_callback(top, i, s, mouse->pointer_x - rect.x, mouse->pointer_y - rect.y);
 144                         }
 145                 }
 146         }
 147 }
 148
 149 void get_pointer_pos(int *x, int *y)
 150 {
 151         *x = mouse->pointer_x;
 152         *y = mouse->pointer_y;
 153 }
 154
 155 int get_button_state()
 156 {
 157         return mouse->bnstate;
 158 }
 159
 160 int get_button(int bn)
 161 {
 162         if(bn < 0 || bn >= 3) {
 163                 return 0;
 164         }
 165         return (mouse->bnstate & (1 << bn)) != 0;
 166 }
 167
 168 static int read_mouse()
 169 {
 170         int rd;
 171         signed char state[3] = {0, 0, 0};
 172
 173         if((rd = read(mouse->dev_fd, state, 3)) == -1) {
 174                 fprintf(stderr, "Unable to get mouse state : %s\n", strerror(errno));
 175                 return -1;
 176         }
 177
 178         mouse->bnstate = state[0] & 7;
 179         mouse->pointer_x += state[1];
 180         mouse->pointer_y -= state[2];
 181
 182         if(mouse->pointer_x < mouse->bounds.x) {
 183                 mouse->pointer_x = mouse->bounds.x;
 184         }
 185
 186         if(mouse->pointer_y < mouse->bounds.y) {
 187                 mouse->pointer_y = mouse->bounds.y;
 188         }
 189
 190         if(mouse->pointer_x > mouse->bounds.x + mouse->bounds.width - 1) {
 191                 mouse->pointer_x = mouse->bounds.x + mouse->bounds.width - 1;
 192         }
 193
 194         if(mouse->pointer_y > mouse->bounds.y + mouse->bounds.height - 1) {
 195                 mouse->pointer_y = mouse->bounds.y + mouse->bounds.height - 1;
 196         }
 197
 198         return 0;
 199 }
 200 #endif // WINNIE_FBDEV