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 "winnie.h"
  40 #include "wm.h"
  41
  42 #define BN_LEFT         1
  43 #define BN_RIGHT        2
  44 #define BN_MIDDLE       4
  45
  46 static int read_mouse();
  47
  48 struct Mouse {
  49         int dev_fd;
  50         Rect bounds;
  51         int pointer_x;
  52         int pointer_y;
  53         int bnstate;
  54 };
  55
  56 static Mouse *mouse;
  57
  58 bool init_mouse()
  59 {
  60         if(!(mouse = (Mouse*)sh_malloc(sizeof *mouse))) {
  61                 return false;
  62         }
  63         get_subsys()->mouse_offset = (int)((char*)mouse - (char*)get_pool());
  64         memset(mouse, 0, sizeof *mouse);
  65
  66         mouse->dev_fd = -1;
  67
  68         if((mouse->dev_fd = open("/dev/psaux", O_RDONLY | O_NONBLOCK)) == -1) {
  69                 fprintf(stderr, "Cannot open /dev/psaux : %s\n", strerror(errno));
  70                 return false;
  71         }
  72
  73         set_mouse_bounds(get_screen_size());
  74         return true;
  75 }
  76
  77 void destroy_mouse()
  78 {
  79         if(mouse->dev_fd != -1) {
  80                 close(mouse->dev_fd);
  81                 mouse->dev_fd = -1;
  82         }
  83         sh_free(mouse);
  84 }
  85
  86 void set_mouse_bounds(const Rect &rect)
  87 {
  88         mouse->bounds = rect;
  89 }
  90
  91 int get_mouse_fd()
  92 {
  93         return mouse->dev_fd;
  94 }
  95
  96 void process_mouse_event()
  97 {
  98         /* TODO:
  99          * - read all pending events from mouse fd (use O_NONBLOCK so that
 100          *   read will return -1 when there are no more events instead of blocking).
 101          */
 102
 103         int prev_state = mouse->bnstate;
 104         int prev_x = mouse->pointer_x;
 105         int prev_y = mouse->pointer_y;
 106
 107         if(read_mouse() == -1) {
 108                 return;
 109         }
 110
 111         Window *top;
 112         if(!(top = wm->get_grab_window())) {
 113                 top = wm->get_window_at_pos(mouse->pointer_x, mouse->pointer_y);
 114                 if(top) {
 115                         wm->set_focused_window(top);
 116                 }
 117                 else {
 118                         wm->set_focused_window(0);
 119                 }
 120         }
 121
 122          /* - send each pointer move and button press/release to the topmost window
 123          *   with the pointer on it.
 124          */
 125
 126         int dx = mouse->pointer_x - prev_x;
 127         int dy = mouse->pointer_y - prev_y;
 128
 129         if((dx || dy) && top) {
 130                 MouseMotionFuncType motion_callback = top->get_mouse_motion_callback();
 131                 if(motion_callback) {
 132                         Rect rect = top->get_absolute_rect();
 133                         motion_callback(top, mouse->pointer_x - rect.x, mouse->pointer_y - rect.y);
 134                 }
 135         }
 136
 137         MouseButtonFuncType button_callback;
 138         if((mouse->bnstate != prev_state) && top && (button_callback = top->get_mouse_button_callback())) {
 139                 int num_bits = sizeof mouse->bnstate * CHAR_BIT;
 140                 for(int i=0; i<num_bits; i++) {
 141                         int s = (mouse->bnstate >> i) & 1;
 142                         int prev_s = (prev_state >> i) & 1;
 143                         if(s != prev_s) {
 144                                 Rect rect = top->get_absolute_rect();
 145                                 button_callback(top, i, s, mouse->pointer_x - rect.x, mouse->pointer_y - rect.y);
 146                         }
 147                 }
 148         }
 149 }
 150
 151 void get_pointer_pos(int *x, int *y)
 152 {
 153         *x = mouse->pointer_x;
 154         *y = mouse->pointer_y;
 155 }
 156
 157 int get_button_state()
 158 {
 159         return mouse->bnstate;
 160 }
 161
 162 int get_button(int bn)
 163 {
 164         if(bn < 0 || bn >= 3) {
 165                 return 0;
 166         }
 167         return (mouse->bnstate & (1 << bn)) != 0;
 168 }
 169
 170 static int read_mouse()
 171 {
 172         int rd;
 173         signed char state[3] = {0, 0, 0};
 174
 175         if((rd = read(mouse->dev_fd, state, 3)) == -1) {
 176                 fprintf(stderr, "Unable to get mouse state : %s\n", strerror(errno));
 177                 return -1;
 178         }
 179
 180         mouse->bnstate = state[0] & 7;
 181         mouse->pointer_x += state[1];
 182         mouse->pointer_y -= state[2];
 183
 184         if(mouse->pointer_x < mouse->bounds.x) {
 185                 mouse->pointer_x = mouse->bounds.x;
 186         }
 187
 188         if(mouse->pointer_y < mouse->bounds.y) {
 189                 mouse->pointer_y = mouse->bounds.y;
 190         }
 191
 192         if(mouse->pointer_x > mouse->bounds.x + mouse->bounds.width - 1) {
 193                 mouse->pointer_x = mouse->bounds.x + mouse->bounds.width - 1;
 194         }
 195
 196         if(mouse->pointer_y > mouse->bounds.y + mouse->bounds.height - 1) {
 197                 mouse->pointer_y = mouse->bounds.y + mouse->bounds.height - 1;
 198         }
 199
 200         return 0;
 201 }
 202 #endif // WINNIE_FBDEV