Pileus Git - wmpus/blob - sys-x11.c

   1 /*
   2  * Copyright (c) 2011-2012, Andy Spencer <andy753421@gmail.com>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  */
  15
  16 #define _GNU_SOURCE
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <search.h>
  20
  21 #include <X11/Xlib.h>
  22 #include <X11/Xproto.h>
  23 #include <X11/Xatom.h>
  24 #include <X11/keysym.h>
  25 #include <X11/extensions/Xinerama.h>
  26
  27 #include "util.h"
  28 #include "conf.h"
  29 #include "sys.h"
  30 #include "wm.h"
  31
  32 /* Configuration */
  33 static int border     = 2;
  34 static int no_capture = 0;
  35
  36 /* Internal structures */
  37 struct win_sys {
  38         Window   xid;
  39         Display *dpy;
  40         struct {
  41                 int left, right, top, bottom;
  42         } strut;
  43         state_t  state;
  44 };
  45
  46 typedef struct {
  47         event_t ev;
  48         int     sym;
  49 } event_map_t;
  50
  51 typedef enum {
  52         WM_PROTO, WM_FOCUS,
  53         NET_STATE, NET_FULL, NET_STRUT,
  54         NATOMS
  55 } atom_t;
  56
  57 typedef enum {
  58         CLR_FOCUS, CLR_UNFOCUS, CLR_URGENT, NCOLORS
  59 } color_t;
  60
  61 /* Global data */
  62 static int   running;
  63 static void *cache;
  64 static Atom atoms[NATOMS];
  65 static int (*xerrorxlib)(Display *, XErrorEvent *);
  66 static unsigned long colors[NCOLORS];
  67 static list_t *screens;
  68 static list_t *struts;
  69
  70 /* Conversion functions */
  71 static event_map_t ev2sym[] = {
  72         {EV_LEFT    , XK_Left },
  73         {EV_RIGHT   , XK_Right},
  74         {EV_UP      , XK_Up   },
  75         {EV_DOWN    , XK_Down },
  76         {EV_HOME    , XK_Home },
  77         {EV_END     , XK_End  },
  78         {EV_PAGEUP  , XK_Prior},
  79         {EV_PAGEDOWN, XK_Next },
  80         {EV_F1      , XK_F1   },
  81         {EV_F2      , XK_F2   },
  82         {EV_F3      , XK_F3   },
  83         {EV_F4      , XK_F4   },
  84         {EV_F5      , XK_F5   },
  85         {EV_F6      , XK_F6   },
  86         {EV_F7      , XK_F7   },
  87         {EV_F8      , XK_F8   },
  88         {EV_F9      , XK_F9   },
  89         {EV_F10     , XK_F10  },
  90         {EV_F11     , XK_F11  },
  91         {EV_F12     , XK_F12  },
  92 };
  93
  94 /* - Modifiers */
  95 static mod_t x2mod(unsigned int state, int up)
  96 {
  97         return (mod_t){
  98                .alt   = !!(state & Mod1Mask   ),
  99                .ctrl  = !!(state & ControlMask),
 100                .shift = !!(state & ShiftMask  ),
 101                .win   = !!(state & Mod4Mask   ),
 102                .up    = up,
 103         };
 104 }
 105
 106 static unsigned int mod2x(mod_t mod)
 107 {
 108         return (mod.alt   ? Mod1Mask    : 0)
 109              | (mod.ctrl  ? ControlMask : 0)
 110              | (mod.shift ? ShiftMask   : 0)
 111              | (mod.win   ? Mod4Mask    : 0);
 112 }
 113
 114 /* - Keycodes */
 115 static event_t xk2ev(KeySym sym)
 116 {
 117         event_map_t *em = map_getr(ev2sym,sym);
 118         return em ? em->ev : sym;
 119 }
 120
 121 static KeySym ev2xk(event_t ev)
 122 {
 123         event_map_t *em = map_get(ev2sym,ev);
 124         return em ? em->sym : ev;
 125 }
 126
 127 static event_t xb2ev(int btn)
 128 {
 129         return btn + EV_MOUSE0;
 130 }
 131
 132 static int ev2xb(event_t ev)
 133 {
 134         return ev - EV_MOUSE0;
 135 }
 136
 137 /* - Pointers */
 138 static ptr_t x2ptr(XEvent *xe)
 139 {
 140         XKeyEvent *xke = &xe->xkey;
 141         return (ptr_t){xke->x, xke->y, xke->x_root, xke->y_root};
 142 }
 143
 144 static Window getfocus(win_t *root, XEvent *xe)
 145 {
 146         int revert;
 147         Window focus = PointerRoot;
 148         if (xe->type == KeyPress || xe->type == KeyRelease)
 149                 XGetInputFocus(root->sys->dpy, &focus, &revert);
 150         if (focus == PointerRoot)
 151                 focus = xe->xkey.subwindow;
 152         if (focus == None)
 153                 focus = xe->xkey.window;
 154         return focus;
 155 }
 156
 157 /* Strut functions
 158  *   Struts are spaces at the edges of the screen that are used by
 159  *   toolbars and statusbars such as dzen. */
 160 static int strut_copy(win_t *to, win_t *from, int scale)
 161 {
 162         int left   = from->sys->strut.left;
 163         int right  = from->sys->strut.right;
 164         int top    = from->sys->strut.top;
 165         int bottom = from->sys->strut.bottom;
 166         if (left == 0 && right == 0 && top == 0 && bottom == 0)
 167                 return 0;
 168         to->x += scale*(left      );
 169         to->y += scale*(top       );
 170         to->w -= scale*(left+right);
 171         to->h -= scale*(top+bottom);
 172         to->sys->strut.left   += scale*left;
 173         to->sys->strut.right  += scale*right;
 174         to->sys->strut.top    += scale*top;
 175         to->sys->strut.bottom += scale*bottom;
 176         return 1;
 177 }
 178
 179 static int strut_add(win_t *root, win_t *win)
 180 {
 181         /* Get X11 strut data */
 182         Atom ret_type;
 183         int ret_size;
 184         unsigned long ret_items, bytes_left;
 185         unsigned char *xdata;
 186         int status = XGetWindowProperty(win->sys->dpy, win->sys->xid,
 187                         atoms[NET_STRUT], 0L, 4L, False, XA_CARDINAL,
 188                         &ret_type, &ret_size, &ret_items, &bytes_left, &xdata);
 189         if (status != Success || ret_size != 32 || ret_items != 4)
 190                 return 0;
 191
 192         win->sys->strut.left   = ((int*)xdata)[0];
 193         win->sys->strut.right  = ((int*)xdata)[1];
 194         win->sys->strut.top    = ((int*)xdata)[2];
 195         win->sys->strut.bottom = ((int*)xdata)[3];
 196         struts = list_insert(struts, win);
 197         for (list_t *cur = screens; cur; cur = cur->next)
 198                 strut_copy(cur->data, win, 1);
 199         return strut_copy(root, win, 1);
 200 }
 201
 202 static int strut_del(win_t *root, win_t *win)
 203 {
 204         list_t *lwin = list_find(struts, win);
 205         if (lwin)
 206                 struts = list_remove(struts, lwin, 0);
 207         for (list_t *cur = screens; cur; cur = cur->next)
 208                 strut_copy(cur->data, win, -1);
 209         return strut_copy(root, win, -1);
 210 }
 211
 212 #if 0
 213 static int is_fullscreen(win_t *win)
 214 {
 215         Atom ret_type;
 216         int ret_size;
 217         unsigned long ret_items, bytes_left;
 218         unsigned char *xdata;
 219         int status = XGetWindowProperty(win->sys->dpy, win->sys->xid,
 220                         atoms[NET_FULL], 0L, 1L, False, XA_ATOM,
 221                         &ret_type, &ret_size, &ret_items, &bytes_left, &xdata);
 222         printf("is_fullscreen:\n");
 223         printf("\t%d\n", status);
 224         printf("\t%d\n", ret_size);
 225         printf("\t%ld\n", ret_items);
 226         printf("\t%p\n", xdata);
 227         if (xdata)
 228         printf("\t%d\n", xdata[0]);
 229         return status == Success && ret_size == 32 && ret_items == 1 &&
 230                 xdata[0] == atoms[NET_FULL];
 231 }
 232 #endif
 233
 234 /* Window functions */
 235 static win_t *win_new(Display *dpy, Window xid)
 236 {
 237         XWindowAttributes attr;
 238         if (XGetWindowAttributes(dpy, xid, &attr))
 239                 if (attr.override_redirect)
 240                         return NULL;
 241         win_t *win    = new0(win_t);
 242         win->x        = attr.x;
 243         win->y        = attr.y;
 244         win->w        = attr.width;
 245         win->h        = attr.height;
 246         win->sys      = new0(win_sys_t);
 247         win->sys->dpy = dpy;
 248         win->sys->xid = xid;
 249         printf("win_new: %p = %p, %d (%d,%d %dx%d)\n",
 250                         win, dpy, (int)xid,
 251                         win->x, win->y, win->w, win->h);
 252         return win;
 253 }
 254
 255 static int win_cmp(const void *_a, const void *_b)
 256 {
 257         const win_t *a = _a, *b = _b;
 258         if (a->sys->dpy < b->sys->dpy) return -1;
 259         if (a->sys->dpy > b->sys->dpy) return  1;
 260         if (a->sys->xid < b->sys->xid) return -1;
 261         if (a->sys->xid > b->sys->xid) return  1;
 262         return 0;
 263 }
 264
 265 static win_t *win_find(Display *dpy, Window xid, int create)
 266 {
 267         if (!dpy || !xid)
 268                 return NULL;
 269         //printf("win_find: %p, %d\n", dpy, (int)xid);
 270         win_sys_t sys = {.dpy=dpy, .xid=xid};
 271         win_t     tmp = {.sys=&sys};
 272         win_t **old = NULL, *new = NULL;
 273         if ((old = tfind(&tmp, &cache, win_cmp)))
 274                 return *old;
 275         if (create && (new = win_new(dpy,xid)))
 276                 tsearch(new, &cache, win_cmp);
 277         return new;
 278 }
 279
 280 static void win_free(win_t *win)
 281 {
 282         free(win->sys);
 283         free(win);
 284 }
 285
 286 static void win_remove(win_t *win)
 287 {
 288         tdelete(win, &cache, win_cmp);
 289         win_free(win);
 290 }
 291
 292 static int win_viewable(win_t *win)
 293 {
 294         XWindowAttributes attr;
 295         if (XGetWindowAttributes(win->sys->dpy, win->sys->xid, &attr))
 296                 return attr.map_state == IsViewable;
 297         else
 298                 return True;
 299 }
 300
 301 /* Drawing functions */
 302 static unsigned long get_color(Display *dpy, const char *name)
 303 {
 304         XColor color;
 305         int screen = DefaultScreen(dpy);
 306         Colormap cmap = DefaultColormap(dpy, screen);
 307         XAllocNamedColor(dpy, cmap, name, &color, &color);
 308         return color.pixel;
 309 }
 310
 311 /* Callbacks */
 312 static void process_event(int type, XEvent *xe, win_t *root)
 313 {
 314         Display  *dpy = root->sys->dpy;
 315         win_t *win = NULL;
 316         //printf("event: %d\n", type);
 317
 318         /* Common data for all these events ... */
 319         ptr_t ptr = {}; mod_t mod = {};
 320         if (type == KeyPress    || type == KeyRelease    ||
 321             type == ButtonPress || type == ButtonRelease ||
 322             type == MotionNotify) {
 323                 Window xid = getfocus(root, xe);
 324                 if (!(win = win_find(dpy,xid,0)))
 325                         return;
 326                 ptr = x2ptr(xe);
 327                 mod = x2mod(xe->xkey.state, type==KeyRelease||type==ButtonRelease);
 328         }
 329
 330         /* Split based on event */
 331         if (type == KeyPress) {
 332                 while (XCheckTypedEvent(dpy, KeyPress, xe));
 333                 KeySym sym = XKeycodeToKeysym(dpy, xe->xkey.keycode, 0);
 334                 printf("got xe %c %hhx\n", xk2ev(sym), mod2int(mod));
 335                 wm_handle_event(win, xk2ev(sym), mod, ptr);
 336         }
 337         else if (type == KeyRelease) {
 338                 //printf("release: %d\n", type);
 339         }
 340         else if (type == ButtonPress) {
 341                 if (wm_handle_event(win, xb2ev(xe->xbutton.button), mod, ptr))
 342                         XGrabPointer(dpy, xe->xbutton.root, True, PointerMotionMask|ButtonReleaseMask,
 343                                         GrabModeAsync, GrabModeAsync, None, None, CurrentTime);
 344                 else
 345                         XAllowEvents(win->sys->dpy, ReplayPointer, CurrentTime);
 346         }
 347         else if (type == ButtonRelease) {
 348                 XUngrabPointer(dpy, CurrentTime);
 349                 wm_handle_event(win, xb2ev(xe->xbutton.button), mod, ptr);
 350         }
 351         else if (type == MotionNotify) {
 352                 while (XCheckTypedEvent(dpy, MotionNotify, xe));
 353                 wm_handle_ptr(win, ptr);
 354         }
 355         else if (type == EnterNotify || type == LeaveNotify) {
 356                 printf("%s: %d\n", type==EnterNotify?"enter":"leave", type);
 357                 event_t ev = EnterNotify ? EV_ENTER : EV_LEAVE;
 358                 if ((win = win_find(dpy,xe->xcrossing.window,0)))
 359                         wm_handle_event(win, ev, MOD(), PTR());
 360         }
 361         else if (type == FocusIn || type == FocusOut) {
 362                 //printf("focus: %d\n", type);
 363                 event_t ev = FocusIn ? EV_FOCUS : EV_UNFOCUS;
 364                 if ((win = win_find(dpy,xe->xfocus.window,0)))
 365                         wm_handle_event(win, ev, MOD(), PTR());
 366         }
 367         else if (type == ConfigureNotify) {
 368                 printf("configure: %d\n", type);
 369         }
 370         else if (type == MapNotify) {
 371                 printf("map: %d\n", type);
 372         }
 373         else if (type == UnmapNotify) {
 374                 if ((win = win_find(dpy,xe->xunmap.window,0)) &&
 375                      win->sys->state != ST_HIDE) {
 376                         if (!strut_del(root, win))
 377                                 wm_remove(win);
 378                         else
 379                                 wm_update();
 380                         win->sys->state = ST_HIDE;
 381                 }
 382         }
 383         else if (type == DestroyNotify) {
 384                 //printf("destroy: %d\n", type);
 385                 if ((win = win_find(dpy,xe->xdestroywindow.window,0)))
 386                         win_remove(win);
 387         }
 388         else if (type == ConfigureRequest) {
 389                 XConfigureRequestEvent *cre = &xe->xconfigurerequest;
 390                 printf("configure_req: %d - %x, (0x%lx) %dx%d @ %d,%d\n",
 391                                 type, (int)cre->window, cre->value_mask,
 392                                 cre->height, cre->width, cre->x, cre->y);
 393                 if ((win = win_find(dpy,xe->xmaprequest.window,1))) {
 394                         XSendEvent(dpy, cre->window, False, StructureNotifyMask, &(XEvent){
 395                                 .xconfigure.type              = ConfigureNotify,
 396                                 .xconfigure.display           = win->sys->dpy,
 397                                 .xconfigure.event             = win->sys->xid,
 398                                 .xconfigure.window            = win->sys->xid,
 399                                 .xconfigure.x                 = win->x,
 400                                 .xconfigure.y                 = win->y,
 401                                 .xconfigure.width             = win->w,
 402                                 .xconfigure.height            = win->h,
 403                                 .xconfigure.border_width      = border,
 404                         });
 405                         XSync(win->sys->dpy, False);
 406                 }
 407         }
 408         else if (type == MapRequest) {
 409                 printf("map_req: %d\n", type);
 410                 if ((win = win_find(dpy,xe->xmaprequest.window,1))) {
 411                         XSelectInput(win->sys->dpy, win->sys->xid, PropertyChangeMask);
 412                         if (!strut_add(root, win))
 413                                 wm_insert(win);
 414                         else
 415                                 wm_update();
 416                 }
 417                 XMapWindow(dpy, xe->xmaprequest.window);
 418         }
 419         else if (type == ClientMessage) {
 420                 printf("msg: %d\n", type);
 421                 XClientMessageEvent *cme = &xe->xclient;
 422                 if ((win = win_find(dpy,cme->window,0))     &&
 423                     (cme->message_type == atoms[NET_STATE]) &&
 424                     (cme->data.l[1] == atoms[NET_FULL] ||
 425                      cme->data.l[2] == atoms[NET_FULL])) {
 426                         if (cme->data.l[0] == 1 || /* _NET_WM_STATE_ADD    */
 427                            (cme->data.l[0] == 2 && /* _NET_WM_STATE_TOGGLE */
 428                             win->sys->state != ST_FULL))
 429                                 sys_show(win, ST_FULL);
 430                         else
 431                                 sys_show(win, ST_SHOW);
 432                 }
 433         }
 434         else if (type == PropertyNotify) {
 435                 printf("prop: %d\n", type);
 436         }
 437         else {
 438                 printf("unknown event: %d\n", type);
 439         }
 440 }
 441
 442 static int xerror(Display *dpy, XErrorEvent *err)
 443 {
 444         if (err->error_code == BadWindow ||
 445             (err->request_code == X_SetInputFocus     && err->error_code == BadMatch   ) ||
 446             (err->request_code == X_PolyText8         && err->error_code == BadDrawable) ||
 447             (err->request_code == X_PolyFillRectangle && err->error_code == BadDrawable) ||
 448             (err->request_code == X_PolySegment       && err->error_code == BadDrawable) ||
 449             (err->request_code == X_ConfigureWindow   && err->error_code == BadMatch   ) ||
 450             (err->request_code == X_GrabButton        && err->error_code == BadAccess  ) ||
 451             (err->request_code == X_GrabKey           && err->error_code == BadAccess  ) ||
 452             (err->request_code == X_CopyArea          && err->error_code == BadDrawable))
 453                 return 0;
 454         if (err->request_code == X_ChangeWindowAttributes && err->error_code == BadAccess)
 455                 error("Another window manager is already running");
 456         return xerrorxlib(dpy, err);
 457 }
 458
 459 /********************
 460  * System functions *
 461  ********************/
 462 void sys_move(win_t *win, int x, int y, int w, int h)
 463 {
 464         //printf("sys_move: %p - %d,%d  %dx%d\n", win, x, y, w, h);
 465         int b = 2*border;
 466         win->x = x; win->y = y;
 467         win->w = MAX(w,1+b); win->h = MAX(h,1+b);
 468         w      = MAX(w-b,1); h      = MAX(h-b,1);
 469         XMoveResizeWindow(win->sys->dpy, win->sys->xid, x, y, w, h);
 470
 471         /* Flush events, so moving window doesn't cause re-focus
 472          * There's probably a better way to do this */
 473         XEvent xe;
 474         XSync(win->sys->dpy, False);
 475         while (XCheckMaskEvent(win->sys->dpy, EnterWindowMask|LeaveWindowMask, &xe))
 476                 printf("Skipping enter/leave event\n");
 477 }
 478
 479 void sys_raise(win_t *win)
 480 {
 481         //printf("sys_raise: %p\n", win);
 482         XRaiseWindow(win->sys->dpy, win->sys->xid);
 483         for (list_t *cur = struts; cur; cur = cur->next)
 484                 XRaiseWindow(((win_t*)cur->data)->sys->dpy,
 485                              ((win_t*)cur->data)->sys->xid);
 486 }
 487
 488 void sys_focus(win_t *win)
 489 {
 490         printf("sys_focus: %p\n", win);
 491
 492         /* Set actual focus */
 493         XSetInputFocus(win->sys->dpy, win->sys->xid,
 494                         RevertToPointerRoot, CurrentTime);
 495         XSendEvent(win->sys->dpy, win->sys->xid, False, NoEventMask, &(XEvent){
 496                 .type                 = ClientMessage,
 497                 .xclient.window       = win->sys->xid,
 498                 .xclient.message_type = atoms[WM_PROTO],
 499                 .xclient.format       = 32,
 500                 .xclient.data.l[0]    = atoms[WM_FOCUS],
 501                 .xclient.data.l[1]    = CurrentTime,
 502         });
 503
 504         /* Set border on focused window */
 505         static win_t *last = NULL;
 506         if (last)
 507                 XSetWindowBorder(last->sys->dpy, last->sys->xid, colors[CLR_UNFOCUS]);
 508         XSync(win->sys->dpy, False);
 509         XSetWindowBorder(win->sys->dpy, win->sys->xid, colors[CLR_FOCUS]);
 510         last = win;
 511 }
 512
 513 void sys_show(win_t *win, state_t state)
 514 {
 515         /* Restore from fullscreen */
 516         switch (state) {
 517         case ST_SHOW:
 518                 printf("sys_show: show\n");
 519                 if (win->sys->state == ST_FULL)
 520                         sys_move(win, win->x, win->y, win->w, win->h);
 521                 XSetWindowBorderWidth(win->sys->dpy, win->sys->xid, border);
 522                 XMapWindow(win->sys->dpy, win->sys->xid);
 523                 XSync(win->sys->dpy, False);
 524                 break;
 525         case ST_FULL:
 526                 printf("sys_show: full\n");
 527                 win_t *screen = NULL;
 528                 for (list_t *cur = screens; cur; cur = cur->next) {
 529                         screen = cur->data;
 530                         if (win->x >= screen->x && win->x <= screen->x+screen->w &&
 531                             win->y >= screen->y && win->y <= screen->y+screen->h)
 532                                 break;
 533                 }
 534                 XSetWindowBorderWidth(win->sys->dpy, win->sys->xid, 0);
 535                 XMapWindow(win->sys->dpy, win->sys->xid);
 536                 XMoveResizeWindow(win->sys->dpy, win->sys->xid,
 537                         screen->x - screen->sys->strut.left,
 538                         screen->y - screen->sys->strut.top,
 539                         screen->w + screen->sys->strut.left + screen->sys->strut.right,
 540                         screen->h + screen->sys->strut.top  + screen->sys->strut.bottom);
 541                 XRaiseWindow(win->sys->dpy, win->sys->xid);
 542                 break;
 543         case ST_SHADE:
 544                 printf("sys_show: shade\n");
 545                 XMapWindow(win->sys->dpy, win->sys->xid);
 546                 break;
 547         case ST_ICON:
 548                 printf("sys_show: icon\n");
 549                 break;
 550         case ST_HIDE:
 551                 printf("sys_show: hide\n");
 552                 XUnmapWindow(win->sys->dpy, win->sys->xid);
 553                 break;
 554         case ST_CLOSE:
 555                 printf("sys_show: close\n");
 556                 XDestroyWindow(win->sys->dpy, win->sys->xid);
 557                 break;
 558         }
 559         win->sys->state = state;
 560 }
 561
 562 void sys_watch(win_t *win, event_t ev, mod_t mod)
 563 {
 564         //printf("sys_watch: %p - %x %hhx\n", win, ev, mod);
 565         XWindowAttributes attr;
 566         XGetWindowAttributes(win->sys->dpy, win->sys->xid, &attr);
 567         long mask = attr.your_event_mask;
 568         if (EV_MOUSE0 <= ev && ev <= EV_MOUSE7)
 569                 XGrabButton(win->sys->dpy, ev2xb(ev), mod2x(mod), win->sys->xid, False,
 570                                 mod.up ? ButtonReleaseMask : ButtonPressMask,
 571                                 GrabModeSync, GrabModeAsync, None, None);
 572         else if (ev == EV_ENTER)
 573                 XSelectInput(win->sys->dpy, win->sys->xid, EnterWindowMask|mask);
 574         else if (ev == EV_LEAVE)
 575                 XSelectInput(win->sys->dpy, win->sys->xid, LeaveWindowMask|mask);
 576         else if (ev == EV_FOCUS || ev == EV_UNFOCUS)
 577                 XSelectInput(win->sys->dpy, win->sys->xid, FocusChangeMask|mask);
 578         else
 579                 XGrabKey(win->sys->dpy, XKeysymToKeycode(win->sys->dpy, ev2xk(ev)),
 580                                 mod2x(mod), win->sys->xid, True, GrabModeAsync, GrabModeAsync);
 581 }
 582
 583 void sys_unwatch(win_t *win, event_t ev, mod_t mod)
 584 {
 585         if (EV_MOUSE0 <= ev && ev <= EV_MOUSE7)
 586                 XUngrabButton(win->sys->dpy, ev2xb(ev), mod2x(mod), win->sys->xid);
 587 }
 588
 589 list_t *sys_info(win_t *win)
 590 {
 591         /* Use global copy of screens so we can add struts */
 592         if (screens == NULL) {
 593                 /* Add Xinerama screens */
 594                 int n = 0;
 595                 XineramaScreenInfo *info = NULL;
 596                 if (XineramaIsActive(win->sys->dpy))
 597                         info = XineramaQueryScreens(win->sys->dpy, &n);
 598                 for (int i = 0; i < n; i++) {
 599                         win_t *screen = new0(win_t);
 600                         screen->x = info[i].x_org;
 601                         screen->y = info[i].y_org;
 602                         screen->w = info[i].width;
 603                         screen->h = info[i].height;
 604                         screen->sys = new0(win_sys_t);
 605                         screens = list_append(screens, screen);
 606                 }
 607         }
 608         if (screens == NULL) {
 609                 /* No xinerama support */
 610                 win_t *screen = new0(win_t);
 611                 *screen = *win;
 612                 screens = list_insert(NULL, screen);
 613         }
 614         return screens;
 615 }
 616
 617 win_t *sys_init(void)
 618 {
 619         Display *dpy;
 620         Window   xid;
 621
 622         /* Load configuration */
 623         border     = conf_get_int("main.border",     border);
 624         no_capture = conf_get_int("main.no-capture", no_capture);
 625
 626         /* Open the display */
 627         if (!(dpy = XOpenDisplay(NULL)))
 628                 error("Unable to get display");
 629         if (!(xid = DefaultRootWindow(dpy)))
 630                 error("Unable to get root window");
 631
 632         /* Setup X11 data */
 633         atoms[WM_PROTO]  = XInternAtom(dpy, "WM_PROTOCOLS",  False);
 634         atoms[WM_FOCUS]  = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
 635         atoms[NET_STATE] = XInternAtom(dpy, "_NET_WM_STATE", False);
 636         atoms[NET_FULL]  = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
 637         atoms[NET_STRUT] = XInternAtom(dpy, "_NET_WM_STRUT", False);
 638
 639         colors[CLR_FOCUS]   = get_color(dpy, "#a0a0ff");
 640         colors[CLR_UNFOCUS] = get_color(dpy, "#101066");
 641         colors[CLR_URGENT]  = get_color(dpy, "#ff0000");
 642         //printf("colors = #%06lx #%06lx #%06lx\n", colors[0], colors[1], colors[2]);
 643
 644         /* Select window management events */
 645         XSelectInput(dpy, xid, SubstructureRedirectMask|SubstructureNotifyMask);
 646         xerrorxlib = XSetErrorHandler(xerror);
 647
 648         return win_find(dpy, xid, 1);
 649 }
 650
 651 void sys_run(win_t *root)
 652 {
 653         /* Add each initial window */
 654         if (!no_capture) {
 655                 unsigned int nkids;
 656                 Window par, xid, *kids = NULL;
 657                 if (XQueryTree(root->sys->dpy, root->sys->xid,
 658                                         &par, &xid, &kids, &nkids)) {
 659                         for(int i = 0; i < nkids; i++) {
 660                                 win_t *win = win_find(root->sys->dpy, kids[i], 1);
 661                                 if (win && win_viewable(win) && !strut_add(root,win))
 662                                         wm_insert(win);
 663                         }
 664                         XFree(kids);
 665                 }
 666                 wm_update(); // For struts
 667         }
 668
 669         /* Main loop */
 670         running = 1;
 671         while (running)
 672         {
 673                 XEvent xe;
 674                 XNextEvent(root->sys->dpy, &xe);
 675                 process_event(xe.type, &xe, root);
 676         }
 677 }
 678
 679 void sys_exit(void)
 680 {
 681         running = 0;
 682 }
 683
 684 void sys_free(win_t *root)
 685 {
 686         XCloseDisplay(root->sys->dpy);
 687         while (screens) {
 688                 win_free(screens->data);
 689                 screens = list_remove(screens, screens, 0);
 690         }
 691         tdestroy(cache, (void(*)(void*))win_free);
 692 }