mousegrabber.c

   1 /*
   2  * mousegrabber.c - mouse pointer grabbing
   3  *
   4  * Copyright © 2008 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 "mouse.h"
  25 #include "mousegrabber.h"
  26 #include "common/xcursor.h"
  27
  28 extern awesome_t globalconf;
  29
  30 /** Grab the mouse.
  31  * \param cursor The cursor to use while grabbing.
  32  * \return True if mouse was grabbed.
  33  */
  34 static bool
  35 mousegrabber_grab(xcb_cursor_t cursor)
  36 {
  37     xcb_window_t root;
  38
  39     for(int screen = 0;
  40         screen < xcb_setup_roots_length(xcb_get_setup(globalconf.connection));
  41         screen++)
  42     {
  43         int16_t x, y;
  44         uint16_t mask;
  45
  46         root = xutil_screen_get(globalconf.connection, screen)->root;
  47         if(mouse_query_pointer(root, &x, &y, NULL, &mask))
  48             break;
  49     }
  50
  51     for(int i = 1000; i; i--)
  52     {
  53         xcb_grab_pointer_reply_t *grab_ptr_r;
  54         xcb_grab_pointer_cookie_t grab_ptr_c =
  55             xcb_grab_pointer_unchecked(globalconf.connection, false, root,
  56                                        XCB_EVENT_MASK_BUTTON_PRESS
  57                                        | XCB_EVENT_MASK_BUTTON_RELEASE
  58                                        | XCB_EVENT_MASK_POINTER_MOTION,
  59                                        XCB_GRAB_MODE_ASYNC,
  60                                        XCB_GRAB_MODE_ASYNC,
  61                                        root, cursor, XCB_CURRENT_TIME);
  62
  63         if((grab_ptr_r = xcb_grab_pointer_reply(globalconf.connection, grab_ptr_c, NULL)))
  64         {
  65             p_delete(&grab_ptr_r);
  66             return true;
  67         }
  68         usleep(1000);
  69     }
  70     return false;
  71 }
  72
  73 /** Handle mouse motion events.
  74  * \param L Lua stack to push the pointer motion.
  75  * \param ev Received mouse motion event.
  76  */
  77 void
  78 mousegrabber_handleevent(lua_State *L, int x, int y, uint16_t mask)
  79 {
  80     luaA_mouse_pushstatus(L, x, y, mask);
  81 }
  82
  83 /** Grab the mouse pointer and list motions, calling callback function at each
  84  * motion. The callback function must return a boolean value: true to
  85  * continue grabbing, false to stop.
  86  * The function is called with one argument:
  87  * a table containing modifiers pointer coordinates.
  88  *
  89  * \param L The Lua VM state.
  90  * \return The number of elements pushed on stack.
  91  *
  92  * \luastack
  93  *
  94  * \lparam A callback function as described above.
  95  */
  96 static int
  97 luaA_mousegrabber_run(lua_State *L)
  98 {
  99     if(globalconf.mousegrabber != LUA_REFNIL)
 100         luaL_error(L, "mousegrabber already running");
 101
 102     uint16_t cfont = xcursor_font_fromstr(luaL_checkstring(L, 2));
 103
 104     if(cfont)
 105     {
 106         xcb_cursor_t cursor = xcursor_new(globalconf.connection, cfont);
 107
 108         luaA_registerfct(L, 1, &globalconf.mousegrabber);
 109
 110         if(!mousegrabber_grab(cursor))
 111         {
 112             luaA_unregister(L, &globalconf.mousegrabber);
 113             luaL_error(L, "unable to grab mouse pointer");
 114         }
 115     }
 116     else
 117         luaA_warn(L, "invalid cursor");
 118
 119     return 0;
 120 }
 121
 122 /** Stop grabbing the mouse pointer.
 123  * \param L The Lua VM state.
 124  * \return The number of elements pushed on stack.
 125  */
 126 int
 127 luaA_mousegrabber_stop(lua_State *L)
 128 {
 129     xcb_ungrab_pointer(globalconf.connection, XCB_CURRENT_TIME);
 130     luaA_unregister(L, &globalconf.mousegrabber);
 131     return 0;
 132 }
 133
 134 const struct luaL_reg awesome_mousegrabber_lib[] =
 135 {
 136     { "run", luaA_mousegrabber_run },
 137     { "stop", luaA_mousegrabber_stop },
 138     { NULL, NULL }
 139 };