mousegrabber.c

   1 /*
   2  * mousegrabber.c - mouse pointer grabbing
   3  *
   4  * Copyright © 2008-2009 Julien Danjou <julien@danjou.info>
   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 2 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 along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <unistd.h>
  23
  24 #include "globalconf.h"
  25 #include "mouse.h"
  26 #include "mousegrabber.h"
  27 #include "luaa.h"
  28 #include "common/xcursor.h"
  29 #include "common/xutil.h"
  30
  31 /** Grab the mouse.
  32  * \param cursor The cursor to use while grabbing.
  33  * \return True if mouse was grabbed.
  34  */
  35 static bool
  36 mousegrabber_grab(xcb_cursor_t cursor)
  37 {
  38     xcb_window_t root = XCB_NONE;
  39
  40     for(int screen = 0;
  41         screen < xcb_setup_roots_length(xcb_get_setup(globalconf.connection));
  42         screen++)
  43     {
  44         int16_t x, y;
  45         uint16_t mask;
  46
  47         root = xutil_screen_get(globalconf.connection, screen)->root;
  48         if(mouse_query_pointer(root, &x, &y, NULL, &mask))
  49             break;
  50     }
  51
  52     for(int i = 1000; i; i--)
  53     {
  54         xcb_grab_pointer_reply_t *grab_ptr_r;
  55         xcb_grab_pointer_cookie_t grab_ptr_c =
  56             xcb_grab_pointer_unchecked(globalconf.connection, false, root,
  57                                        XCB_EVENT_MASK_BUTTON_PRESS
  58                                        | XCB_EVENT_MASK_BUTTON_RELEASE
  59                                        | XCB_EVENT_MASK_POINTER_MOTION,
  60                                        XCB_GRAB_MODE_ASYNC,
  61                                        XCB_GRAB_MODE_ASYNC,
  62                                        root, cursor, XCB_CURRENT_TIME);
  63
  64         if((grab_ptr_r = xcb_grab_pointer_reply(globalconf.connection, grab_ptr_c, NULL)))
  65         {
  66             p_delete(&grab_ptr_r);
  67             return true;
  68         }
  69         usleep(1000);
  70     }
  71     return false;
  72 }
  73
  74 /** Handle mouse motion events.
  75  * \param L Lua stack to push the pointer motion.
  76  * \param x The received mouse event x component.
  77  * \param y The received mouse event y component.
  78  * \param mask The received mouse event bit mask.
  79  */
  80 void
  81 mousegrabber_handleevent(lua_State *L, int x, int y, uint16_t mask)
  82 {
  83     luaA_mouse_pushstatus(L, x, y, mask);
  84 }
  85
  86 /** Grab the mouse pointer and list motions, calling callback function at each
  87  * motion. The callback function must return a boolean value: true to
  88  * continue grabbing, false to stop.
  89  * The function is called with one argument:
  90  * a table containing modifiers pointer coordinates.
  91  *
  92  * \param L The Lua VM state.
  93  * \return The number of elements pushed on stack.
  94  *
  95  * \luastack
  96  *
  97  * \lparam A callback function as described above.
  98  */
  99 static int
 100 luaA_mousegrabber_run(lua_State *L)
 101 {
 102     if(globalconf.mousegrabber != LUA_REFNIL)
 103         luaL_error(L, "mousegrabber already running");
 104
 105     uint16_t cfont = xcursor_font_fromstr(luaL_checkstring(L, 2));
 106
 107     if(cfont)
 108     {
 109         xcb_cursor_t cursor = xcursor_new(globalconf.connection, cfont);
 110
 111         luaA_registerfct(L, 1, &globalconf.mousegrabber);
 112
 113         if(!mousegrabber_grab(cursor))
 114         {
 115             luaA_unregister(L, &globalconf.mousegrabber);
 116             luaL_error(L, "unable to grab mouse pointer");
 117         }
 118     }
 119     else
 120         luaA_warn(L, "invalid cursor");
 121
 122     return 0;
 123 }
 124
 125 /** Stop grabbing the mouse pointer.
 126  * \param L The Lua VM state.
 127  * \return The number of elements pushed on stack.
 128  */
 129 int
 130 luaA_mousegrabber_stop(lua_State *L)
 131 {
 132     xcb_ungrab_pointer(globalconf.connection, XCB_CURRENT_TIME);
 133     luaA_unregister(L, &globalconf.mousegrabber);
 134     return 0;
 135 }
 136
 137 const struct luaL_reg awesome_mousegrabber_lib[] =
 138 {
 139     { "run", luaA_mousegrabber_run },
 140     { "stop", luaA_mousegrabber_stop },
 141     { NULL, NULL }
 142 };
 143
 144 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80