dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance. Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag. Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <signal.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif /* XINERAMA */
  42 #include <X11/Xft/Xft.h>
  43
  44 #include "drw.h"
  45 #include "util.h"
  46
  47 /* macros */
  48 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  49 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  50 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  51                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  52 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  53 #define LENGTH(X)               (sizeof X / sizeof X[0])
  54 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  55 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  56 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  57 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  58 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
  59
  60 #define SYSTEM_TRAY_REQUEST_DOCK    0
  61
  62 /* XEMBED messages */
  63 #define XEMBED_EMBEDDED_NOTIFY      0
  64 #define XEMBED_WINDOW_ACTIVATE      1
  65 #define XEMBED_FOCUS_IN             4
  66 #define XEMBED_MODALITY_ON         10
  67
  68 #define XEMBED_MAPPED              (1 << 0)
  69 #define XEMBED_WINDOW_ACTIVATE      1
  70 #define XEMBED_WINDOW_DEACTIVATE    2
  71
  72 #define VERSION_MAJOR               0
  73 #define VERSION_MINOR               0
  74 #define XEMBED_EMBEDDED_VERSION (VERSION_MAJOR << 16) | VERSION_MINOR
  75
  76 /* enums */
  77 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
  78 enum { SchemeNorm, SchemeSel }; /* color schemes */
  79 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
  80        NetSystemTray, NetSystemTrayOP, NetSystemTrayOrientation, NetSystemTrayOrientationHorz,
  81        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  82        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
  83 enum { Manager, Xembed, XembedInfo, XLast }; /* Xembed atoms */
  84 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  85 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  86        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
  87
  88 typedef union {
  89         int i;
  90         unsigned int ui;
  91         float f;
  92         const void *v;
  93 } Arg;
  94
  95 typedef struct {
  96         unsigned int click;
  97         unsigned int mask;
  98         unsigned int button;
  99         void (*func)(const Arg *arg);
 100         const Arg arg;
 101 } Button;
 102
 103 typedef struct Monitor Monitor;
 104 typedef struct Client Client;
 105 struct Client {
 106         char name[256];
 107         float mina, maxa;
 108         int x, y, w, h;
 109         int sfx, sfy, sfw, sfh; /* stored float geometry, used on mode revert */
 110         int oldx, oldy, oldw, oldh;
 111         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 112         int bw, oldbw;
 113         unsigned int tags;
 114         int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
 115         Client *next;
 116         Client *snext;
 117         Monitor *mon;
 118         Window win;
 119 };
 120
 121 typedef struct {
 122         unsigned int mod;
 123         KeySym keysym;
 124         void (*func)(const Arg *);
 125         const Arg arg;
 126 } Key;
 127
 128 typedef struct {
 129         const char *symbol;
 130         void (*arrange)(Monitor *);
 131 } Layout;
 132
 133 typedef struct Pertag Pertag;
 134 struct Monitor {
 135         char ltsymbol[16];
 136         float mfact;
 137         int nmaster;
 138         int num;
 139         int by;               /* bar geometry */
 140         int mx, my, mw, mh;   /* screen size */
 141         int wx, wy, ww, wh;   /* window area  */
 142         unsigned int seltags;
 143         unsigned int sellt;
 144         unsigned int tagset[2];
 145         int showbar;
 146         int topbar;
 147         Client *clients;
 148         Client *sel;
 149         Client *stack;
 150         Monitor *next;
 151         Window barwin;
 152         const Layout *lt[2];
 153         Pertag *pertag;
 154 };
 155
 156 typedef struct {
 157         const char *class;
 158         const char *instance;
 159         const char *title;
 160         unsigned int tags;
 161         int isfloating;
 162         int monitor;
 163 } Rule;
 164
 165 typedef struct Systray   Systray;
 166 struct Systray {
 167         Window win;
 168         Client *icons;
 169 };
 170
 171 /* function declarations */
 172 static void applyrules(Client *c);
 173 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
 174 static void arrange(Monitor *m);
 175 static void arrangemon(Monitor *m);
 176 static void attach(Client *c);
 177 static void attachstack(Client *c);
 178 static void buttonpress(XEvent *e);
 179 static void checkotherwm(void);
 180 static void cleanup(void);
 181 static void cleanupmon(Monitor *mon);
 182 static void clientmessage(XEvent *e);
 183 static void configure(Client *c);
 184 static void configurenotify(XEvent *e);
 185 static void configurerequest(XEvent *e);
 186 static Monitor *createmon(void);
 187 static void destroynotify(XEvent *e);
 188 static void detach(Client *c);
 189 static void detachstack(Client *c);
 190 static Monitor *dirtomon(int dir);
 191 static void drawbar(Monitor *m);
 192 static void drawbars(void);
 193 static void enternotify(XEvent *e);
 194 static void expose(XEvent *e);
 195 static void focus(Client *c);
 196 static void focusin(XEvent *e);
 197 static void focusmon(const Arg *arg);
 198 static void focusstack(const Arg *arg);
 199 static Atom getatomprop(Client *c, Atom prop);
 200 static int getrootptr(int *x, int *y);
 201 static long getstate(Window w);
 202 static unsigned int getsystraywidth();
 203 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 204 static void grabbuttons(Client *c, int focused);
 205 static void grabkeys(void);
 206 static void incnmaster(const Arg *arg);
 207 static void keypress(XEvent *e);
 208 static void killclient(const Arg *arg);
 209 static void manage(Window w, XWindowAttributes *wa);
 210 static void mappingnotify(XEvent *e);
 211 static void maprequest(XEvent *e);
 212 static void monocle(Monitor *m);
 213 static void motionnotify(XEvent *e);
 214 static void movemouse(const Arg *arg);
 215 static Client *nexttiled(Client *c);
 216 static void pop(Client *);
 217 static void propertynotify(XEvent *e);
 218 static void quit(const Arg *arg);
 219 static Monitor *recttomon(int x, int y, int w, int h);
 220 static void removesystrayicon(Client *i);
 221 static void resize(Client *c, int x, int y, int w, int h, int interact);
 222 static void resizebarwin(Monitor *m);
 223 static void resizeclient(Client *c, int x, int y, int w, int h);
 224 static void resizemouse(const Arg *arg);
 225 static void resizerequest(XEvent *e);
 226 static void restack(Monitor *m);
 227 static void run(void);
 228 static void scan(void);
 229 static int sendevent(Window w, Atom proto, int m, long d0, long d1, long d2, long d3, long d4);
 230 static void sendmon(Client *c, Monitor *m);
 231 static void setclientstate(Client *c, long state);
 232 static void setfocus(Client *c);
 233 static void setfullscreen(Client *c, int fullscreen);
 234 static void setlayout(const Arg *arg);
 235 static void setmfact(const Arg *arg);
 236 static void setup(void);
 237 static void seturgent(Client *c, int urg);
 238 static void showhide(Client *c);
 239 static void sigchld(int unused);
 240 static void spawn(const Arg *arg);
 241 static Monitor *systraytomon(Monitor *m);
 242 static void tag(const Arg *arg);
 243 static void tagmon(const Arg *arg);
 244 static void tile(Monitor *);
 245 static void togglebar(const Arg *arg);
 246 static void togglefloating(const Arg *arg);
 247 static void toggletag(const Arg *arg);
 248 static void toggleview(const Arg *arg);
 249 static void unfocus(Client *c, int setfocus);
 250 static void unmanage(Client *c, int destroyed);
 251 static void unmapnotify(XEvent *e);
 252 static void updatebarpos(Monitor *m);
 253 static void updatebars(void);
 254 static void updateclientlist(void);
 255 static int updategeom(void);
 256 static void updatenumlockmask(void);
 257 static void updatesizehints(Client *c);
 258 static void updatestatus(void);
 259 static void updatesystray(void);
 260 static void updatesystrayicongeom(Client *i, int w, int h);
 261 static void updatesystrayiconstate(Client *i, XPropertyEvent *ev);
 262 static void updatetitle(Client *c);
 263 static void updatewindowtype(Client *c);
 264 static void updatewmhints(Client *c);
 265 static void view(const Arg *arg);
 266 static Client *wintoclient(Window w);
 267 static Monitor *wintomon(Window w);
 268 static Client *wintosystrayicon(Window w);
 269 static int xerror(Display *dpy, XErrorEvent *ee);
 270 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 271 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 272 static void zoom(const Arg *arg);
 273
 274 /* variables */
 275 static Systray *systray =  NULL;
 276 static const char broken[] = "broken";
 277 static char stext[256];
 278 static int screen;
 279 static int sw, sh;           /* X display screen geometry width, height */
 280 static int bh, blw = 0;      /* bar geometry */
 281 static int lrpad;            /* sum of left and right padding for text */
 282 static int (*xerrorxlib)(Display *, XErrorEvent *);
 283 static unsigned int numlockmask = 0;
 284 static void (*handler[LASTEvent]) (XEvent *) = {
 285         [ButtonPress] = buttonpress,
 286         [ClientMessage] = clientmessage,
 287         [ConfigureRequest] = configurerequest,
 288         [ConfigureNotify] = configurenotify,
 289         [DestroyNotify] = destroynotify,
 290         [EnterNotify] = enternotify,
 291         [Expose] = expose,
 292         [FocusIn] = focusin,
 293         [KeyPress] = keypress,
 294         [MappingNotify] = mappingnotify,
 295         [MapRequest] = maprequest,
 296         [MotionNotify] = motionnotify,
 297         [PropertyNotify] = propertynotify,
 298         [ResizeRequest] = resizerequest,
 299         [UnmapNotify] = unmapnotify
 300 };
 301 static Atom wmatom[WMLast], netatom[NetLast], xatom[XLast];
 302 static int running = 1;
 303 static Cur *cursor[CurLast];
 304 static Clr **scheme;
 305 static Display *dpy;
 306 static Drw *drw;
 307 static Monitor *mons, *selmon;
 308 static Window root, wmcheckwin;
 309
 310 /* configuration, allows nested code to access above variables */
 311 #include "config.h"
 312
 313 struct Pertag {
 314         unsigned int curtag, prevtag; /* current and previous tag */
 315         int nmasters[LENGTH(tags) + 1]; /* number of windows in master area */
 316         float mfacts[LENGTH(tags) + 1]; /* mfacts per tag */
 317         unsigned int sellts[LENGTH(tags) + 1]; /* selected layouts */
 318         const Layout *ltidxs[LENGTH(tags) + 1][2]; /* matrix of tags and layouts indexes  */
 319         int showbars[LENGTH(tags) + 1]; /* display bar for the current tag */
 320 };
 321
 322 /* compile-time check if all tags fit into an unsigned int bit array. */
 323 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 324
 325 /* function implementations */
 326 void
 327 applyrules(Client *c)
 328 {
 329         const char *class, *instance;
 330         unsigned int i;
 331         const Rule *r;
 332         Monitor *m;
 333         XClassHint ch = { NULL, NULL };
 334
 335         /* rule matching */
 336         c->isfloating = 0;
 337         c->tags = 0;
 338         XGetClassHint(dpy, c->win, &ch);
 339         class    = ch.res_class ? ch.res_class : broken;
 340         instance = ch.res_name  ? ch.res_name  : broken;
 341
 342         for (i = 0; i < LENGTH(rules); i++) {
 343                 r = &rules[i];
 344                 if ((!r->title || strstr(c->name, r->title))
 345                 && (!r->class || strstr(class, r->class))
 346                 && (!r->instance || strstr(instance, r->instance)))
 347                 {
 348                         c->isfloating = r->isfloating;
 349                         c->tags |= r->tags;
 350                         for (m = mons; m && m->num != r->monitor; m = m->next);
 351                         if (m)
 352                                 c->mon = m;
 353                 }
 354         }
 355         if (ch.res_class)
 356                 XFree(ch.res_class);
 357         if (ch.res_name)
 358                 XFree(ch.res_name);
 359         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 360 }
 361
 362 int
 363 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
 364 {
 365         int baseismin;
 366         Monitor *m = c->mon;
 367
 368         /* set minimum possible */
 369         *w = MAX(1, *w);
 370         *h = MAX(1, *h);
 371         if (interact) {
 372                 if (*x > sw)
 373                         *x = sw - WIDTH(c);
 374                 if (*y > sh)
 375                         *y = sh - HEIGHT(c);
 376                 if (*x + *w + 2 * c->bw < 0)
 377                         *x = 0;
 378                 if (*y + *h + 2 * c->bw < 0)
 379                         *y = 0;
 380         } else {
 381                 if (*x >= m->wx + m->ww)
 382                         *x = m->wx + m->ww - WIDTH(c);
 383                 if (*y >= m->wy + m->wh)
 384                         *y = m->wy + m->wh - HEIGHT(c);
 385                 if (*x + *w + 2 * c->bw <= m->wx)
 386                         *x = m->wx;
 387                 if (*y + *h + 2 * c->bw <= m->wy)
 388                         *y = m->wy;
 389         }
 390         if (*h < bh)
 391                 *h = bh;
 392         if (*w < bh)
 393                 *w = bh;
 394         if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 395                 /* see last two sentences in ICCCM 4.1.2.3 */
 396                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 397                 if (!baseismin) { /* temporarily remove base dimensions */
 398                         *w -= c->basew;
 399                         *h -= c->baseh;
 400                 }
 401                 /* adjust for aspect limits */
 402                 if (c->mina > 0 && c->maxa > 0) {
 403                         if (c->maxa < (float)*w / *h)
 404                                 *w = *h * c->maxa + 0.5;
 405                         else if (c->mina < (float)*h / *w)
 406                                 *h = *w * c->mina + 0.5;
 407                 }
 408                 if (baseismin) { /* increment calculation requires this */
 409                         *w -= c->basew;
 410                         *h -= c->baseh;
 411                 }
 412                 /* adjust for increment value */
 413                 if (c->incw)
 414                         *w -= *w % c->incw;
 415                 if (c->inch)
 416                         *h -= *h % c->inch;
 417                 /* restore base dimensions */
 418                 *w = MAX(*w + c->basew, c->minw);
 419                 *h = MAX(*h + c->baseh, c->minh);
 420                 if (c->maxw)
 421                         *w = MIN(*w, c->maxw);
 422                 if (c->maxh)
 423                         *h = MIN(*h, c->maxh);
 424         }
 425         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 426 }
 427
 428 void
 429 arrange(Monitor *m)
 430 {
 431         if (m)
 432                 showhide(m->stack);
 433         else for (m = mons; m; m = m->next)
 434                 showhide(m->stack);
 435         if (m) {
 436                 arrangemon(m);
 437                 restack(m);
 438         } else for (m = mons; m; m = m->next)
 439                 arrangemon(m);
 440 }
 441
 442 void
 443 arrangemon(Monitor *m)
 444 {
 445         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 446         if (m->lt[m->sellt]->arrange)
 447                 m->lt[m->sellt]->arrange(m);
 448 }
 449
 450 void
 451 attach(Client *c)
 452 {
 453         c->next = c->mon->clients;
 454         c->mon->clients = c;
 455 }
 456
 457 void
 458 attachstack(Client *c)
 459 {
 460         c->snext = c->mon->stack;
 461         c->mon->stack = c;
 462 }
 463
 464 void
 465 buttonpress(XEvent *e)
 466 {
 467         unsigned int i, x, click, occ = 0;
 468         Arg arg = {0};
 469         Client *c;
 470         Monitor *m;
 471         XButtonPressedEvent *ev = &e->xbutton;
 472
 473         click = ClkRootWin;
 474         /* focus monitor if necessary */
 475         if ((m = wintomon(ev->window)) && m != selmon) {
 476                 unfocus(selmon->sel, 1);
 477                 selmon = m;
 478                 focus(NULL);
 479         }
 480         if (ev->window == selmon->barwin) {
 481                 i = x = 0;
 482                 for (c = m->clients; c; c = c->next)
 483                         occ |= c->tags == 255 ? 0 : c->tags;
 484                 do {
 485                         /* do not reserve space for vacant tags */
 486                         if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
 487                                 continue;
 488                         x += TEXTW(tags[i]);
 489                 } while (ev->x >= x && ++i < LENGTH(tags));
 490                 if (i < LENGTH(tags)) {
 491                         click = ClkTagBar;
 492                         arg.ui = 1 << i;
 493                 } else if (ev->x < x + blw)
 494                         click = ClkLtSymbol;
 495                 else if (ev->x > selmon->ww - (int)TEXTW(stext))
 496                         click = ClkStatusText;
 497                 else
 498                         click = ClkWinTitle;
 499         } else if ((c = wintoclient(ev->window))) {
 500                 focus(c);
 501                 restack(selmon);
 502                 XAllowEvents(dpy, ReplayPointer, CurrentTime);
 503                 click = ClkClientWin;
 504         }
 505         for (i = 0; i < LENGTH(buttons); i++)
 506                 if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 507                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 508                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 509 }
 510
 511 void
 512 checkotherwm(void)
 513 {
 514         xerrorxlib = XSetErrorHandler(xerrorstart);
 515         /* this causes an error if some other window manager is running */
 516         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 517         XSync(dpy, False);
 518         XSetErrorHandler(xerror);
 519         XSync(dpy, False);
 520 }
 521
 522 void
 523 cleanup(void)
 524 {
 525         Arg a = {.ui = ~0};
 526         Layout foo = { "", NULL };
 527         Monitor *m;
 528         size_t i;
 529
 530         view(&a);
 531         selmon->lt[selmon->sellt] = &foo;
 532         for (m = mons; m; m = m->next)
 533                 while (m->stack)
 534                         unmanage(m->stack, 0);
 535         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 536         while (mons)
 537                 cleanupmon(mons);
 538         if (showsystray) {
 539                 XUnmapWindow(dpy, systray->win);
 540                 XDestroyWindow(dpy, systray->win);
 541                 free(systray);
 542         }
 543         for (i = 0; i < CurLast; i++)
 544                 drw_cur_free(drw, cursor[i]);
 545         for (i = 0; i < LENGTH(colors); i++)
 546                 free(scheme[i]);
 547         XDestroyWindow(dpy, wmcheckwin);
 548         drw_free(drw);
 549         XSync(dpy, False);
 550         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 551         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 552 }
 553
 554 void
 555 cleanupmon(Monitor *mon)
 556 {
 557         Monitor *m;
 558
 559         if (mon == mons)
 560                 mons = mons->next;
 561         else {
 562                 for (m = mons; m && m->next != mon; m = m->next);
 563                 m->next = mon->next;
 564         }
 565         XUnmapWindow(dpy, mon->barwin);
 566         XDestroyWindow(dpy, mon->barwin);
 567         free(mon);
 568 }
 569
 570 void
 571 clientmessage(XEvent *e)
 572 {
 573         XWindowAttributes wa;
 574         XSetWindowAttributes swa;
 575         XClientMessageEvent *cme = &e->xclient;
 576         Client *c = wintoclient(cme->window);
 577
 578         if (showsystray && cme->window == systray->win && cme->message_type == netatom[NetSystemTrayOP]) {
 579                 /* add systray icons */
 580                 if (cme->data.l[1] == SYSTEM_TRAY_REQUEST_DOCK) {
 581                         if (!(c = (Client *)calloc(1, sizeof(Client))))
 582                                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
 583                         if (!(c->win = cme->data.l[2])) {
 584                                 free(c);
 585                                 return;
 586                         }
 587                         c->mon = selmon;
 588                         c->next = systray->icons;
 589                         systray->icons = c;
 590                         XGetWindowAttributes(dpy, c->win, &wa);
 591                         c->x = c->oldx = c->y = c->oldy = 0;
 592                         c->w = c->oldw = wa.width;
 593                         c->h = c->oldh = wa.height;
 594                         c->oldbw = wa.border_width;
 595                         c->bw = 0;
 596                         c->isfloating = True;
 597                         /* reuse tags field as mapped status */
 598                         c->tags = 1;
 599                         updatesizehints(c);
 600                         updatesystrayicongeom(c, wa.width, wa.height);
 601                         XAddToSaveSet(dpy, c->win);
 602                         XSelectInput(dpy, c->win, StructureNotifyMask | PropertyChangeMask | ResizeRedirectMask);
 603                         XReparentWindow(dpy, c->win, systray->win, 0, 0);
 604                         /* use parents background color */
 605                         swa.background_pixel  = scheme[SchemeNorm][ColBg].pixel;
 606                         XChangeWindowAttributes(dpy, c->win, CWBackPixel, &swa);
 607                         sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_EMBEDDED_NOTIFY, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
 608                         /* FIXME not sure if I have to send these events, too */
 609                         sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_FOCUS_IN, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
 610                         sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_WINDOW_ACTIVATE, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
 611                         sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_MODALITY_ON, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
 612                         XSync(dpy, False);
 613                         resizebarwin(selmon);
 614                         updatesystray();
 615                         setclientstate(c, NormalState);
 616                 }
 617                 return;
 618         }
 619         if (!c)
 620                 return;
 621         if (cme->message_type == netatom[NetWMState]) {
 622                 if (cme->data.l[1] == netatom[NetWMFullscreen]
 623                 || cme->data.l[2] == netatom[NetWMFullscreen])
 624                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 625                                 || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 626         } else if (cme->message_type == netatom[NetActiveWindow]) {
 627                 if (c != selmon->sel && !c->isurgent)
 628                         seturgent(c, 1);
 629         }
 630 }
 631
 632 void
 633 configure(Client *c)
 634 {
 635         XConfigureEvent ce;
 636
 637         ce.type = ConfigureNotify;
 638         ce.display = dpy;
 639         ce.event = c->win;
 640         ce.window = c->win;
 641         ce.x = c->x;
 642         ce.y = c->y;
 643         ce.width = c->w;
 644         ce.height = c->h;
 645         ce.border_width = c->bw;
 646         ce.above = None;
 647         ce.override_redirect = False;
 648         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 649 }
 650
 651 void
 652 configurenotify(XEvent *e)
 653 {
 654         Monitor *m;
 655         Client *c;
 656         XConfigureEvent *ev = &e->xconfigure;
 657         int dirty;
 658
 659         /* TODO: updategeom handling sucks, needs to be simplified */
 660         if (ev->window == root) {
 661                 dirty = (sw != ev->width || sh != ev->height);
 662                 sw = ev->width;
 663                 sh = ev->height;
 664                 if (updategeom() || dirty) {
 665                         drw_resize(drw, sw, bh);
 666                         updatebars();
 667                         for (m = mons; m; m = m->next) {
 668                                 for (c = m->clients; c; c = c->next)
 669                                         if (c->isfullscreen)
 670                                                 resizeclient(c, m->mx, m->my, m->mw, m->mh);
 671                                 resizebarwin(m);
 672                         }
 673                         focus(NULL);
 674                         arrange(NULL);
 675                 }
 676         }
 677 }
 678
 679 void
 680 configurerequest(XEvent *e)
 681 {
 682         Client *c;
 683         Monitor *m;
 684         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 685         XWindowChanges wc;
 686
 687         if ((c = wintoclient(ev->window))) {
 688                 if (ev->value_mask & CWBorderWidth)
 689                         c->bw = ev->border_width;
 690                 else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 691                         m = c->mon;
 692                         if (ev->value_mask & CWX) {
 693                                 c->oldx = c->x;
 694                                 c->x = m->mx + ev->x;
 695                         }
 696                         if (ev->value_mask & CWY) {
 697                                 c->oldy = c->y;
 698                                 c->y = m->my + ev->y;
 699                         }
 700                         if (ev->value_mask & CWWidth) {
 701                                 c->oldw = c->w;
 702                                 c->w = ev->width;
 703                         }
 704                         if (ev->value_mask & CWHeight) {
 705                                 c->oldh = c->h;
 706                                 c->h = ev->height;
 707                         }
 708                         if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 709                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 710                         if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 711                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 712                         if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 713                                 configure(c);
 714                         if (ISVISIBLE(c))
 715                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 716                 } else
 717                         configure(c);
 718         } else {
 719                 wc.x = ev->x;
 720                 wc.y = ev->y;
 721                 wc.width = ev->width;
 722                 wc.height = ev->height;
 723                 wc.border_width = ev->border_width;
 724                 wc.sibling = ev->above;
 725                 wc.stack_mode = ev->detail;
 726                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 727         }
 728         XSync(dpy, False);
 729 }
 730
 731 Monitor *
 732 createmon(void)
 733 {
 734         Monitor *m;
 735         unsigned int i;
 736
 737         m = ecalloc(1, sizeof(Monitor));
 738         m->tagset[0] = m->tagset[1] = 1;
 739         m->mfact = mfact;
 740         m->nmaster = nmaster;
 741         m->showbar = showbar;
 742         m->topbar = topbar;
 743         m->lt[0] = &layouts[0];
 744         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 745         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 746         m->pertag = ecalloc(1, sizeof(Pertag));
 747         m->pertag->curtag = m->pertag->prevtag = 1;
 748
 749         for (i = 0; i <= LENGTH(tags); i++) {
 750                 m->pertag->nmasters[i] = m->nmaster;
 751                 m->pertag->mfacts[i] = m->mfact;
 752
 753                 m->pertag->ltidxs[i][0] = m->lt[0];
 754                 m->pertag->ltidxs[i][1] = m->lt[1];
 755                 m->pertag->sellts[i] = m->sellt;
 756
 757                 m->pertag->showbars[i] = m->showbar;
 758         }
 759
 760         return m;
 761 }
 762
 763 void
 764 destroynotify(XEvent *e)
 765 {
 766         Client *c;
 767         XDestroyWindowEvent *ev = &e->xdestroywindow;
 768
 769         if ((c = wintoclient(ev->window)))
 770                 unmanage(c, 1);
 771         else if ((c = wintosystrayicon(ev->window))) {
 772                 removesystrayicon(c);
 773                 resizebarwin(selmon);
 774                 updatesystray();
 775         }
 776 }
 777
 778 void
 779 detach(Client *c)
 780 {
 781         Client **tc;
 782
 783         for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 784         *tc = c->next;
 785 }
 786
 787 void
 788 detachstack(Client *c)
 789 {
 790         Client **tc, *t;
 791
 792         for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 793         *tc = c->snext;
 794
 795         if (c == c->mon->sel) {
 796                 for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 797                 c->mon->sel = t;
 798         }
 799 }
 800
 801 Monitor *
 802 dirtomon(int dir)
 803 {
 804         Monitor *m = NULL;
 805
 806         if (dir > 0) {
 807                 if (!(m = selmon->next))
 808                         m = mons;
 809         } else if (selmon == mons)
 810                 for (m = mons; m->next; m = m->next);
 811         else
 812                 for (m = mons; m->next != selmon; m = m->next);
 813         return m;
 814 }
 815
 816 void
 817 drawbar(Monitor *m)
 818 {
 819         int x, w, sw = 0, stw = 0;
 820         int boxs = drw->fonts->h / 9;
 821         int boxw = drw->fonts->h / 6 + 2;
 822         unsigned int i, occ = 0, urg = 0;
 823         Client *c;
 824
 825         if(showsystray && m == systraytomon(m))
 826                 stw = getsystraywidth();
 827
 828         /* draw status first so it can be overdrawn by tags later */
 829         if (m == selmon || 1) { /* status is only drawn on selected monitor */
 830                 drw_setscheme(drw, scheme[SchemeNorm]);
 831                 sw = TEXTW(stext) - lrpad / 2 + 2; /* 2px right padding */
 832                 drw_text(drw, m->ww - sw - stw, 0, sw, bh, lrpad / 2 - 2, stext, 0);
 833         }
 834
 835         resizebarwin(m);
 836         for (c = m->clients; c; c = c->next) {
 837                 occ |= c->tags == 255 ? 0 : c->tags;
 838                 if (c->isurgent)
 839                         urg |= c->tags;
 840         }
 841         x = 0;
 842         for (i = 0; i < LENGTH(tags); i++) {
 843                 /* do not draw vacant tags */
 844                 if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
 845                 continue;
 846
 847                 w = TEXTW(tags[i]);
 848                 drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 849                 drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 850                 x += w;
 851         }
 852         w = blw = TEXTW(m->ltsymbol);
 853         drw_setscheme(drw, scheme[SchemeNorm]);
 854         x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 855
 856         if ((w = m->ww - sw - stw - x) > bh) {
 857                 if (m->sel) {
 858                         drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 859                         drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 860                         if (m->sel->isfloating)
 861                                 drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 862                 } else {
 863                         drw_setscheme(drw, scheme[SchemeNorm]);
 864                         drw_rect(drw, x, 0, w, bh, 1, 1);
 865                 }
 866         }
 867         drw_map(drw, m->barwin, 0, 0, m->ww - stw, bh);
 868 }
 869
 870 void
 871 drawbars(void)
 872 {
 873         Monitor *m;
 874
 875         for (m = mons; m; m = m->next)
 876                 drawbar(m);
 877 }
 878
 879 void
 880 enternotify(XEvent *e)
 881 {
 882         Client *c;
 883         Monitor *m;
 884         XCrossingEvent *ev = &e->xcrossing;
 885
 886         if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 887                 return;
 888         c = wintoclient(ev->window);
 889         m = c ? c->mon : wintomon(ev->window);
 890         if (m != selmon) {
 891                 unfocus(selmon->sel, 1);
 892                 selmon = m;
 893         } else if (!c || c == selmon->sel)
 894                 return;
 895         focus(c);
 896 }
 897
 898 void
 899 expose(XEvent *e)
 900 {
 901         Monitor *m;
 902         XExposeEvent *ev = &e->xexpose;
 903
 904         if (ev->count == 0 && (m = wintomon(ev->window))) {
 905                 drawbar(m);
 906                 if (m == selmon)
 907                         updatesystray();
 908         }
 909 }
 910
 911 void
 912 focus(Client *c)
 913 {
 914         if (!c || !ISVISIBLE(c))
 915                 for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 916         if (selmon->sel && selmon->sel != c)
 917                 unfocus(selmon->sel, 0);
 918         if (c) {
 919                 if (c->mon != selmon)
 920                         selmon = c->mon;
 921                 if (c->isurgent)
 922                         seturgent(c, 0);
 923                 detachstack(c);
 924                 attachstack(c);
 925                 grabbuttons(c, 1);
 926                 XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 927                 setfocus(c);
 928         } else {
 929                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 930                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 931         }
 932         selmon->sel = c;
 933         drawbars();
 934 }
 935
 936 /* there are some broken focus acquiring clients needing extra handling */
 937 void
 938 focusin(XEvent *e)
 939 {
 940         XFocusChangeEvent *ev = &e->xfocus;
 941
 942         if (selmon->sel && ev->window != selmon->sel->win)
 943                 setfocus(selmon->sel);
 944 }
 945
 946 void
 947 focusmon(const Arg *arg)
 948 {
 949         Monitor *m;
 950
 951         if (!mons->next)
 952                 return;
 953         if ((m = dirtomon(arg->i)) == selmon)
 954                 return;
 955         unfocus(selmon->sel, 0);
 956         selmon = m;
 957         focus(NULL);
 958 }
 959
 960 void
 961 focusstack(const Arg *arg)
 962 {
 963         Client *c = NULL, *i;
 964
 965         if (!selmon->sel)
 966                 return;
 967         if (arg->i > 0) {
 968                 for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 969                 if (!c)
 970                         for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 971         } else {
 972                 for (i = selmon->clients; i != selmon->sel; i = i->next)
 973                         if (ISVISIBLE(i))
 974                                 c = i;
 975                 if (!c)
 976                         for (; i; i = i->next)
 977                                 if (ISVISIBLE(i))
 978                                         c = i;
 979         }
 980         if (c) {
 981                 focus(c);
 982                 restack(selmon);
 983         }
 984 }
 985
 986 Atom
 987 getatomprop(Client *c, Atom prop)
 988 {
 989         int di;
 990         unsigned long dl;
 991         unsigned char *p = NULL;
 992         Atom da, atom = None;
 993         /* FIXME getatomprop should return the number of items and a pointer to
 994          * the stored data instead of this workaround */
 995         Atom req = XA_ATOM;
 996         if (prop == xatom[XembedInfo])
 997                 req = xatom[XembedInfo];
 998
 999         if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, req,
1000                 &da, &di, &dl, &dl, &p) == Success && p) {
1001                 atom = *(Atom *)p;
1002                 if (da == xatom[XembedInfo] && dl == 2)
1003                         atom = ((Atom *)p)[1];
1004                 XFree(p);
1005         }
1006         return atom;
1007 }
1008
1009 int
1010 getrootptr(int *x, int *y)
1011 {
1012         int di;
1013         unsigned int dui;
1014         Window dummy;
1015
1016         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
1017 }
1018
1019 long
1020 getstate(Window w)
1021 {
1022         int format;
1023         long result = -1;
1024         unsigned char *p = NULL;
1025         unsigned long n, extra;
1026         Atom real;
1027
1028         if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
1029                 &real, &format, &n, &extra, (unsigned char **)&p) != Success)
1030                 return -1;
1031         if (n != 0)
1032                 result = *p;
1033         XFree(p);
1034         return result;
1035 }
1036
1037 unsigned int
1038 getsystraywidth()
1039 {
1040         unsigned int w = 0;
1041         Client *i;
1042         if(showsystray)
1043                 for(i = systray->icons; i; w += i->w + systrayspacing, i = i->next) ;
1044         return w ? w + systrayspacing : 1;
1045 }
1046
1047 int
1048 gettextprop(Window w, Atom atom, char *text, unsigned int size)
1049 {
1050         char **list = NULL;
1051         int n;
1052         XTextProperty name;
1053
1054         if (!text || size == 0)
1055                 return 0;
1056         text[0] = '\0';
1057         if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
1058                 return 0;
1059         if (name.encoding == XA_STRING)
1060                 strncpy(text, (char *)name.value, size - 1);
1061         else {
1062                 if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
1063                         strncpy(text, *list, size - 1);
1064                         XFreeStringList(list);
1065                 }
1066         }
1067         text[size - 1] = '\0';
1068         XFree(name.value);
1069         return 1;
1070 }
1071
1072 void
1073 grabbuttons(Client *c, int focused)
1074 {
1075         updatenumlockmask();
1076         {
1077                 unsigned int i, j;
1078                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1079                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1080                 if (!focused)
1081                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1082                                 BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
1083                 for (i = 0; i < LENGTH(buttons); i++)
1084                         if (buttons[i].click == ClkClientWin)
1085                                 for (j = 0; j < LENGTH(modifiers); j++)
1086                                         XGrabButton(dpy, buttons[i].button,
1087                                                 buttons[i].mask | modifiers[j],
1088                                                 c->win, False, BUTTONMASK,
1089                                                 GrabModeAsync, GrabModeSync, None, None);
1090         }
1091 }
1092
1093 void
1094 grabkeys(void)
1095 {
1096         updatenumlockmask();
1097         {
1098                 unsigned int i, j;
1099                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1100                 KeyCode code;
1101
1102                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1103                 for (i = 0; i < LENGTH(keys); i++)
1104                         if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1105                                 for (j = 0; j < LENGTH(modifiers); j++)
1106                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1107                                                 True, GrabModeAsync, GrabModeAsync);
1108         }
1109 }
1110
1111 void
1112 incnmaster(const Arg *arg)
1113 {
1114         selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag] = MAX(selmon->nmaster + arg->i, 0);
1115         arrange(selmon);
1116 }
1117
1118 #ifdef XINERAMA
1119 static int
1120 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
1121 {
1122         while (n--)
1123                 if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1124                 && unique[n].width == info->width && unique[n].height == info->height)
1125                         return 0;
1126         return 1;
1127 }
1128 #endif /* XINERAMA */
1129
1130 void
1131 keypress(XEvent *e)
1132 {
1133         unsigned int i;
1134         KeySym keysym;
1135         XKeyEvent *ev;
1136
1137         ev = &e->xkey;
1138         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1139         for (i = 0; i < LENGTH(keys); i++)
1140                 if (keysym == keys[i].keysym
1141                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1142                 && keys[i].func)
1143                         keys[i].func(&(keys[i].arg));
1144 }
1145
1146 void
1147 killclient(const Arg *arg)
1148 {
1149         if (!selmon->sel)
1150                 return;
1151         if (!sendevent(selmon->sel->win, wmatom[WMDelete], NoEventMask, wmatom[WMDelete], CurrentTime, 0 , 0, 0)) {
1152                 XGrabServer(dpy);
1153                 XSetErrorHandler(xerrordummy);
1154                 XSetCloseDownMode(dpy, DestroyAll);
1155                 XKillClient(dpy, selmon->sel->win);
1156                 XSync(dpy, False);
1157                 XSetErrorHandler(xerror);
1158                 XUngrabServer(dpy);
1159         }
1160 }
1161
1162 void
1163 manage(Window w, XWindowAttributes *wa)
1164 {
1165         Client *c, *t = NULL;
1166         Window trans = None;
1167         XWindowChanges wc;
1168
1169         c = ecalloc(1, sizeof(Client));
1170         c->win = w;
1171         /* geometry */
1172         c->x = c->oldx = wa->x;
1173         c->y = c->oldy = wa->y;
1174         c->w = c->oldw = wa->width;
1175         c->h = c->oldh = wa->height;
1176         c->oldbw = wa->border_width;
1177
1178         updatetitle(c);
1179         if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1180                 c->mon = t->mon;
1181                 c->tags = t->tags;
1182         } else {
1183                 c->mon = selmon;
1184                 applyrules(c);
1185         }
1186
1187         if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1188                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1189         if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1190                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1191         c->x = MAX(c->x, c->mon->mx);
1192         /* only fix client y-offset, if the client center might cover the bar */
1193         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1194                 && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1195         c->bw = borderpx;
1196
1197         wc.border_width = c->bw;
1198         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1199         XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1200         configure(c); /* propagates border_width, if size doesn't change */
1201         updatewindowtype(c);
1202         updatesizehints(c);
1203         updatewmhints(c);
1204         c->sfx = c->x;
1205         c->sfy = c->y;
1206         c->sfw = c->w;
1207         c->sfh = c->h;
1208         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1209         grabbuttons(c, 0);
1210         if (!c->isfloating)
1211                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1212         if (c->isfloating)
1213                 XRaiseWindow(dpy, c->win);
1214         attach(c);
1215         attachstack(c);
1216         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1217                 (unsigned char *) &(c->win), 1);
1218         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1219         setclientstate(c, NormalState);
1220         if (c->mon == selmon)
1221                 unfocus(selmon->sel, 0);
1222         c->mon->sel = c;
1223         arrange(c->mon);
1224         XMapWindow(dpy, c->win);
1225         focus(NULL);
1226 }
1227
1228 void
1229 mappingnotify(XEvent *e)
1230 {
1231         XMappingEvent *ev = &e->xmapping;
1232
1233         XRefreshKeyboardMapping(ev);
1234         if (ev->request == MappingKeyboard)
1235                 grabkeys();
1236 }
1237
1238 void
1239 maprequest(XEvent *e)
1240 {
1241         static XWindowAttributes wa;
1242         XMapRequestEvent *ev = &e->xmaprequest;
1243         Client *i;
1244         if ((i = wintosystrayicon(ev->window))) {
1245                 sendevent(i->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_WINDOW_ACTIVATE, 0, systray->win, XEMBED_EMBEDDED_VERSION);
1246                 resizebarwin(selmon);
1247                 updatesystray();
1248         }
1249
1250         if (!XGetWindowAttributes(dpy, ev->window, &wa))
1251                 return;
1252         if (wa.override_redirect)
1253                 return;
1254         if (!wintoclient(ev->window))
1255                 manage(ev->window, &wa);
1256 }
1257
1258 void
1259 monocle(Monitor *m)
1260 {
1261         unsigned int n = 0;
1262         Client *c;
1263
1264         for (c = m->clients; c; c = c->next)
1265                 if (ISVISIBLE(c))
1266                         n++;
1267         if (n > 0) /* override layout symbol */
1268                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "%s/%d", layouts[2].symbol, n);
1269         for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1270                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1271 }
1272
1273 void
1274 motionnotify(XEvent *e)
1275 {
1276         static Monitor *mon = NULL;
1277         Monitor *m;
1278         XMotionEvent *ev = &e->xmotion;
1279
1280         if (ev->window != root)
1281                 return;
1282         if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1283                 unfocus(selmon->sel, 1);
1284                 selmon = m;
1285                 focus(NULL);
1286         }
1287         mon = m;
1288 }
1289
1290 void
1291 movemouse(const Arg *arg)
1292 {
1293         int x, y, ocx, ocy, nx, ny;
1294         Client *c;
1295         Monitor *m;
1296         XEvent ev;
1297         Time lasttime = 0;
1298
1299         if (!(c = selmon->sel))
1300                 return;
1301         if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1302                 return;
1303         restack(selmon);
1304         ocx = c->x;
1305         ocy = c->y;
1306         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1307                 None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1308                 return;
1309         if (!getrootptr(&x, &y))
1310                 return;
1311         do {
1312                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1313                 switch(ev.type) {
1314                 case ConfigureRequest:
1315                 case Expose:
1316                 case MapRequest:
1317                         handler[ev.type](&ev);
1318                         break;
1319                 case MotionNotify:
1320                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1321                                 continue;
1322                         lasttime = ev.xmotion.time;
1323
1324                         nx = ocx + (ev.xmotion.x - x);
1325                         ny = ocy + (ev.xmotion.y - y);
1326                         if (abs(selmon->wx - nx) < snap)
1327                                 nx = selmon->wx;
1328                         else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1329                                 nx = selmon->wx + selmon->ww - WIDTH(c);
1330                         if (abs(selmon->wy - ny) < snap)
1331                                 ny = selmon->wy;
1332                         else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1333                                 ny = selmon->wy + selmon->wh - HEIGHT(c);
1334                         if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1335                         && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1336                                 togglefloating(NULL);
1337                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1338                                 resize(c, nx, ny, c->w, c->h, 1);
1339                         break;
1340                 }
1341         } while (ev.type != ButtonRelease);
1342         XUngrabPointer(dpy, CurrentTime);
1343         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1344                 sendmon(c, m);
1345                 selmon = m;
1346                 focus(NULL);
1347         }
1348 }
1349
1350 Client *
1351 nexttiled(Client *c)
1352 {
1353         for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1354         return c;
1355 }
1356
1357 void
1358 pop(Client *c)
1359 {
1360         detach(c);
1361         attach(c);
1362         focus(c);
1363         arrange(c->mon);
1364 }
1365
1366 void
1367 propertynotify(XEvent *e)
1368 {
1369         Client *c;
1370         Window trans;
1371         XPropertyEvent *ev = &e->xproperty;
1372
1373         if ((c = wintosystrayicon(ev->window))) {
1374                 if (ev->atom == XA_WM_NORMAL_HINTS) {
1375                         updatesizehints(c);
1376                         updatesystrayicongeom(c, c->w, c->h);
1377                 }
1378                 else
1379                         updatesystrayiconstate(c, ev);
1380                 resizebarwin(selmon);
1381                 updatesystray();
1382         }
1383         if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1384                 updatestatus();
1385         else if (ev->state == PropertyDelete)
1386                 return; /* ignore */
1387         else if ((c = wintoclient(ev->window))) {
1388                 switch(ev->atom) {
1389                 default: break;
1390                 case XA_WM_TRANSIENT_FOR:
1391                         if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1392                                 (c->isfloating = (wintoclient(trans)) != NULL))
1393                                 arrange(c->mon);
1394                         break;
1395                 case XA_WM_NORMAL_HINTS:
1396                         updatesizehints(c);
1397                         break;
1398                 case XA_WM_HINTS:
1399                         updatewmhints(c);
1400                         drawbars();
1401                         break;
1402                 }
1403                 if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1404                         updatetitle(c);
1405                         if (c == c->mon->sel)
1406                                 drawbar(c->mon);
1407                 }
1408                 if (ev->atom == netatom[NetWMWindowType])
1409                         updatewindowtype(c);
1410         }
1411 }
1412
1413 void
1414 quit(const Arg *arg)
1415 {
1416         running = 0;
1417 }
1418
1419 Monitor *
1420 recttomon(int x, int y, int w, int h)
1421 {
1422         Monitor *m, *r = selmon;
1423         int a, area = 0;
1424
1425         for (m = mons; m; m = m->next)
1426                 if ((a = INTERSECT(x, y, w, h, m)) > area) {
1427                         area = a;
1428                         r = m;
1429                 }
1430         return r;
1431 }
1432
1433 void
1434 removesystrayicon(Client *i)
1435 {
1436         Client **ii;
1437
1438         if (!showsystray || !i)
1439                 return;
1440         for (ii = &systray->icons; *ii && *ii != i; ii = &(*ii)->next);
1441         if (ii)
1442                 *ii = i->next;
1443         free(i);
1444 }
1445
1446
1447 void
1448 resize(Client *c, int x, int y, int w, int h, int interact)
1449 {
1450         if (applysizehints(c, &x, &y, &w, &h, interact))
1451                 resizeclient(c, x, y, w, h);
1452 }
1453
1454 void
1455 resizebarwin(Monitor *m) {
1456         unsigned int w = m->ww;
1457         if (showsystray && m == systraytomon(m))
1458                 w -= getsystraywidth();
1459         XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, w, bh);
1460 }
1461
1462 void
1463 resizeclient(Client *c, int x, int y, int w, int h)
1464 {
1465         XWindowChanges wc;
1466
1467         c->oldx = c->x; c->x = wc.x = x;
1468         c->oldy = c->y; c->y = wc.y = y;
1469         c->oldw = c->w; c->w = wc.width = w;
1470         c->oldh = c->h; c->h = wc.height = h;
1471         wc.border_width = c->bw;
1472         if (((nexttiled(c->mon->clients) == c && !nexttiled(c->next))
1473             || &monocle == c->mon->lt[c->mon->sellt]->arrange)
1474             && !c->isfullscreen) {
1475                 c->w = wc.width += c->bw * 2;
1476                 c->h = wc.height += c->bw * 2;
1477                 wc.border_width = 0;
1478         }
1479         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1480         configure(c);
1481         XSync(dpy, False);
1482 }
1483
1484 void
1485 resizemouse(const Arg *arg)
1486 {
1487         int ocx, ocy, nw, nh;
1488         Client *c;
1489         Monitor *m;
1490         XEvent ev;
1491         Time lasttime = 0;
1492
1493         if (!(c = selmon->sel))
1494                 return;
1495         if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1496                 return;
1497         restack(selmon);
1498         ocx = c->x;
1499         ocy = c->y;
1500         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1501                 None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1502                 return;
1503         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1504         do {
1505                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1506                 switch(ev.type) {
1507                 case ConfigureRequest:
1508                 case Expose:
1509                 case MapRequest:
1510                         handler[ev.type](&ev);
1511                         break;
1512                 case MotionNotify:
1513                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1514                                 continue;
1515                         lasttime = ev.xmotion.time;
1516
1517                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1518                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1519                         if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1520                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1521                         {
1522                                 if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1523                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1524                                         togglefloating(NULL);
1525                         }
1526                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1527                                 resize(c, c->x, c->y, nw, nh, 1);
1528                         break;
1529                 }
1530         } while (ev.type != ButtonRelease);
1531         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1532         XUngrabPointer(dpy, CurrentTime);
1533         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1534         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1535                 sendmon(c, m);
1536                 selmon = m;
1537                 focus(NULL);
1538         }
1539 }
1540
1541 void
1542 resizerequest(XEvent *e)
1543 {
1544         XResizeRequestEvent *ev = &e->xresizerequest;
1545         Client *i;
1546
1547         if ((i = wintosystrayicon(ev->window))) {
1548                 updatesystrayicongeom(i, ev->width, ev->height);
1549                 resizebarwin(selmon);
1550                 updatesystray();
1551         }
1552 }
1553
1554 void
1555 restack(Monitor *m)
1556 {
1557         Client *c;
1558         XEvent ev;
1559         XWindowChanges wc;
1560
1561         drawbar(m);
1562         if (!m->sel)
1563                 return;
1564         if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1565                 XRaiseWindow(dpy, m->sel->win);
1566         if (m->lt[m->sellt]->arrange) {
1567                 wc.stack_mode = Below;
1568                 wc.sibling = m->barwin;
1569                 for (c = m->stack; c; c = c->snext)
1570                         if (!c->isfloating && ISVISIBLE(c)) {
1571                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1572                                 wc.sibling = c->win;
1573                         }
1574         }
1575         XSync(dpy, False);
1576         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1577 }
1578
1579 void
1580 run(void)
1581 {
1582         XEvent ev;
1583         /* main event loop */
1584         XSync(dpy, False);
1585         while (running && !XNextEvent(dpy, &ev))
1586                 if (handler[ev.type])
1587                         handler[ev.type](&ev); /* call handler */
1588 }
1589
1590 void
1591 scan(void)
1592 {
1593         unsigned int i, num;
1594         Window d1, d2, *wins = NULL;
1595         XWindowAttributes wa;
1596
1597         if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1598                 for (i = 0; i < num; i++) {
1599                         if (!XGetWindowAttributes(dpy, wins[i], &wa)
1600                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1601                                 continue;
1602                         if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1603                                 manage(wins[i], &wa);
1604                 }
1605                 for (i = 0; i < num; i++) { /* now the transients */
1606                         if (!XGetWindowAttributes(dpy, wins[i], &wa))
1607                                 continue;
1608                         if (XGetTransientForHint(dpy, wins[i], &d1)
1609                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1610                                 manage(wins[i], &wa);
1611                 }
1612                 if (wins)
1613                         XFree(wins);
1614         }
1615 }
1616
1617 void
1618 sendmon(Client *c, Monitor *m)
1619 {
1620         if (c->mon == m)
1621                 return;
1622         unfocus(c, 1);
1623         detach(c);
1624         detachstack(c);
1625         c->mon = m;
1626         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1627         attach(c);
1628         attachstack(c);
1629         focus(NULL);
1630         arrange(NULL);
1631 }
1632
1633 void
1634 setclientstate(Client *c, long state)
1635 {
1636         long data[] = { state, None };
1637
1638         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1639                 PropModeReplace, (unsigned char *)data, 2);
1640 }
1641
1642 int
1643 sendevent(Window w, Atom proto, int mask, long d0, long d1, long d2, long d3, long d4)
1644 {
1645         int n;
1646         Atom *protocols, mt;
1647         int exists = 0;
1648         XEvent ev;
1649
1650         if (proto == wmatom[WMTakeFocus] || proto == wmatom[WMDelete]) {
1651                 mt = wmatom[WMProtocols];
1652                 if (XGetWMProtocols(dpy, w, &protocols, &n)) {
1653                         while (!exists && n--)
1654                                 exists = protocols[n] == proto;
1655                         XFree(protocols);
1656                 }
1657         }
1658         else {
1659                 exists = True;
1660                 mt = proto;
1661         }
1662         if (exists) {
1663                 ev.type = ClientMessage;
1664                 ev.xclient.window = w;
1665                 ev.xclient.message_type = mt;
1666                 ev.xclient.format = 32;
1667                 ev.xclient.data.l[0] = d0;
1668                 ev.xclient.data.l[1] = d1;
1669                 ev.xclient.data.l[2] = d2;
1670                 ev.xclient.data.l[3] = d3;
1671                 ev.xclient.data.l[4] = d4;
1672                 XSendEvent(dpy, w, False, mask, &ev);
1673         }
1674         return exists;
1675 }
1676
1677 void
1678 setfocus(Client *c)
1679 {
1680         if (!c->neverfocus) {
1681                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1682                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1683                         XA_WINDOW, 32, PropModeReplace,
1684                         (unsigned char *) &(c->win), 1);
1685         }
1686         sendevent(c->win, wmatom[WMTakeFocus], NoEventMask, wmatom[WMTakeFocus], CurrentTime, 0, 0, 0);
1687 }
1688
1689 void
1690 setfullscreen(Client *c, int fullscreen)
1691 {
1692         if (fullscreen && !c->isfullscreen) {
1693                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1694                         PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1695                 c->isfullscreen = 1;
1696                 c->oldstate = c->isfloating;
1697                 c->oldbw = c->bw;
1698                 c->bw = 0;
1699                 c->isfloating = 1;
1700                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1701                 XRaiseWindow(dpy, c->win);
1702         } else if (!fullscreen && c->isfullscreen){
1703                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1704                         PropModeReplace, (unsigned char*)0, 0);
1705                 c->isfullscreen = 0;
1706                 c->isfloating = c->oldstate;
1707                 c->bw = c->oldbw;
1708                 c->x = c->oldx;
1709                 c->y = c->oldy;
1710                 c->w = c->oldw;
1711                 c->h = c->oldh;
1712                 resizeclient(c, c->x, c->y, c->w, c->h);
1713                 arrange(c->mon);
1714         }
1715 }
1716
1717 void
1718 setlayout(const Arg *arg)
1719 {
1720         if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1721                 selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag] ^= 1;
1722         if (arg && arg->v)
1723                 selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt] = (Layout *)arg->v;
1724         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1725         if (selmon->sel)
1726                 arrange(selmon);
1727         else
1728                 drawbar(selmon);
1729 }
1730
1731 /* arg > 1.0 will set mfact absolutely */
1732 void
1733 setmfact(const Arg *arg)
1734 {
1735         float f;
1736
1737         if (!arg || !selmon->lt[selmon->sellt]->arrange)
1738                 return;
1739         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1740         if (f < 0.05 || f > 0.95)
1741                 return;
1742         selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag] = f;
1743         arrange(selmon);
1744 }
1745
1746 void
1747 setup(void)
1748 {
1749         int i;
1750         XSetWindowAttributes wa;
1751         Atom utf8string;
1752
1753         /* clean up any zombies immediately */
1754         sigchld(0);
1755
1756         /* init screen */
1757         screen = DefaultScreen(dpy);
1758         sw = DisplayWidth(dpy, screen);
1759         sh = DisplayHeight(dpy, screen);
1760         root = RootWindow(dpy, screen);
1761         drw = drw_create(dpy, screen, root, sw, sh);
1762         if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1763                 die("no fonts could be loaded.");
1764         lrpad = drw->fonts->h;
1765         bh = drw->fonts->h + 2;
1766         updategeom();
1767         /* init atoms */
1768         utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1769         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1770         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1771         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1772         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1773         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1774         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1775         netatom[NetSystemTray] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_S0", False);
1776         netatom[NetSystemTrayOP] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_OPCODE", False);
1777         netatom[NetSystemTrayOrientation] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_ORIENTATION", False);
1778         netatom[NetSystemTrayOrientationHorz] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_ORIENTATION_HORZ", False);
1779         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1780         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1781         netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1782         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1783         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1784         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1785         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1786         xatom[Manager] = XInternAtom(dpy, "MANAGER", False);
1787         xatom[Xembed] = XInternAtom(dpy, "_XEMBED", False);
1788         xatom[XembedInfo] = XInternAtom(dpy, "_XEMBED_INFO", False);
1789         /* init cursors */
1790         cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1791         cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1792         cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1793         /* init appearance */
1794         scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
1795         for (i = 0; i < LENGTH(colors); i++)
1796                 scheme[i] = drw_scm_create(drw, colors[i], 3);
1797         /* init system tray */
1798         updatesystray();
1799         /* init bars */
1800         updatebars();
1801         updatestatus();
1802         /* supporting window for NetWMCheck */
1803         wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1804         XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1805                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1806         XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1807                 PropModeReplace, (unsigned char *) "dwm", 3);
1808         XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1809                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1810         /* EWMH support per view */
1811         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1812                 PropModeReplace, (unsigned char *) netatom, NetLast);
1813         XDeleteProperty(dpy, root, netatom[NetClientList]);
1814         /* select events */
1815         wa.cursor = cursor[CurNormal]->cursor;
1816         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1817                 |ButtonPressMask|PointerMotionMask|EnterWindowMask
1818                 |LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1819         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1820         XSelectInput(dpy, root, wa.event_mask);
1821         grabkeys();
1822         focus(NULL);
1823 }
1824
1825
1826 void
1827 seturgent(Client *c, int urg)
1828 {
1829         XWMHints *wmh;
1830
1831         c->isurgent = urg;
1832         if (!(wmh = XGetWMHints(dpy, c->win)))
1833                 return;
1834         wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1835         XSetWMHints(dpy, c->win, wmh);
1836         XFree(wmh);
1837 }
1838
1839 void
1840 showhide(Client *c)
1841 {
1842         if (!c)
1843                 return;
1844         if (ISVISIBLE(c)) {
1845                 /* show clients top down */
1846                 XMoveWindow(dpy, c->win, c->x, c->y);
1847                 if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1848                         resize(c, c->x, c->y, c->w, c->h, 0);
1849                 showhide(c->snext);
1850         } else {
1851                 /* hide clients bottom up */
1852                 showhide(c->snext);
1853                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1854         }
1855 }
1856
1857 void
1858 sigchld(int unused)
1859 {
1860         if (signal(SIGCHLD, sigchld) == SIG_ERR)
1861                 die("can't install SIGCHLD handler:");
1862         while (0 < waitpid(-1, NULL, WNOHANG));
1863 }
1864
1865 void
1866 spawn(const Arg *arg)
1867 {
1868         if (arg->v == dmenucmd)
1869                 dmenumon[0] = '0' + selmon->num;
1870         if (fork() == 0) {
1871                 if (dpy)
1872                         close(ConnectionNumber(dpy));
1873                 setsid();
1874                 execvp(((char **)arg->v)[0], (char **)arg->v);
1875                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1876                 perror(" failed");
1877                 exit(EXIT_SUCCESS);
1878         }
1879 }
1880
1881 void
1882 tag(const Arg *arg)
1883 {
1884         if (selmon->sel && arg->ui & TAGMASK) {
1885                 selmon->sel->tags = arg->ui & TAGMASK;
1886                 focus(NULL);
1887                 arrange(selmon);
1888         }
1889 }
1890
1891 void
1892 tagmon(const Arg *arg)
1893 {
1894         if (!selmon->sel || !mons->next)
1895                 return;
1896         sendmon(selmon->sel, dirtomon(arg->i));
1897 }
1898
1899 void
1900 tile(Monitor *m) {
1901         unsigned int i, n, h, r, g = 0, mw, my, ty;
1902         Client *c;
1903
1904         for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1905         if (n == 0)
1906                 return;
1907
1908         if(n > m->nmaster)
1909                 mw = m->nmaster ? (m->ww - (g = gappx)) * m->mfact : 0;
1910         else
1911                 mw = m->ww;
1912         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1913                 if(i < m->nmaster) {
1914                         r = MIN(n, m->nmaster) - i;
1915                         h = (m->wh - my - gappx * (r - 1)) / r;
1916                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1917                         my += HEIGHT(c) + gappx;
1918                 }
1919                 else {
1920                         r = n - i;
1921                         h = (m->wh - ty - gappx * (r - 1)) / r;
1922                         resize(c, m->wx + mw + g, m->wy + ty, m->ww - mw - g - (2*c->bw), h - (2*c->bw), False);
1923                         ty += HEIGHT(c) + gappx;
1924                 }
1925 }
1926
1927 void
1928 togglebar(const Arg *arg)
1929 {
1930         selmon->showbar = selmon->pertag->showbars[selmon->pertag->curtag] = !selmon->showbar;
1931         updatebarpos(selmon);
1932         resizebarwin(selmon);
1933         if (showsystray) {
1934                 XWindowChanges wc;
1935                 if (!selmon->showbar)
1936                         wc.y = -bh;
1937                 else if (selmon->showbar) {
1938                         wc.y = 0;
1939                         if (!selmon->topbar)
1940                                 wc.y = selmon->mh - bh;
1941                 }
1942                 XConfigureWindow(dpy, systray->win, CWY, &wc);
1943         }
1944         arrange(selmon);
1945 }
1946
1947 void
1948 togglefloating(const Arg *arg)
1949 {
1950         if (!selmon->sel)
1951                 return;
1952         if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1953                 return;
1954         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1955         if (selmon->sel->isfloating)
1956                 /* restore last known float dimensions */
1957                 resize(selmon->sel, selmon->sel->sfx, selmon->sel->sfy,
1958                        selmon->sel->sfw, selmon->sel->sfh, False);
1959         else {
1960                 /* save last known float dimensions */
1961                 selmon->sel->sfx = selmon->sel->x;
1962                 selmon->sel->sfy = selmon->sel->y;
1963                 selmon->sel->sfw = selmon->sel->w;
1964                 selmon->sel->sfh = selmon->sel->h;
1965         }
1966         arrange(selmon);
1967 }
1968
1969 void
1970 toggletag(const Arg *arg)
1971 {
1972         unsigned int newtags;
1973
1974         if (!selmon->sel)
1975                 return;
1976         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1977         if (newtags) {
1978                 selmon->sel->tags = newtags;
1979                 focus(NULL);
1980                 arrange(selmon);
1981         }
1982 }
1983
1984 void
1985 toggleview(const Arg *arg)
1986 {
1987         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1988         int i;
1989
1990         if (newtagset) {
1991                 selmon->tagset[selmon->seltags] = newtagset;
1992
1993                 if (newtagset == ~0) {
1994                         selmon->pertag->prevtag = selmon->pertag->curtag;
1995                         selmon->pertag->curtag = 0;
1996                 }
1997
1998                 /* test if the user did not select the same tag */
1999                 if (!(newtagset & 1 << (selmon->pertag->curtag - 1))) {
2000                         selmon->pertag->prevtag = selmon->pertag->curtag;
2001                         for (i = 0; !(newtagset & 1 << i); i++) ;
2002                         selmon->pertag->curtag = i + 1;
2003                 }
2004
2005                 /* apply settings for this view */
2006                 selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag];
2007                 selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag];
2008                 selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag];
2009                 selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt];
2010                 selmon->lt[selmon->sellt^1] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt^1];
2011
2012                 if (selmon->showbar != selmon->pertag->showbars[selmon->pertag->curtag])
2013                         togglebar(NULL);
2014
2015                 focus(NULL);
2016                 arrange(selmon);
2017         }
2018 }
2019
2020 void
2021 unfocus(Client *c, int setfocus)
2022 {
2023         if (!c)
2024                 return;
2025         grabbuttons(c, 0);
2026         XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
2027         if (setfocus) {
2028                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
2029                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
2030         }
2031 }
2032
2033 void
2034 unmanage(Client *c, int destroyed)
2035 {
2036         Monitor *m = c->mon;
2037         XWindowChanges wc;
2038
2039         detach(c);
2040         detachstack(c);
2041         if (!destroyed) {
2042                 wc.border_width = c->oldbw;
2043                 XGrabServer(dpy); /* avoid race conditions */
2044                 XSetErrorHandler(xerrordummy);
2045                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
2046                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
2047                 setclientstate(c, WithdrawnState);
2048                 XSync(dpy, False);
2049                 XSetErrorHandler(xerror);
2050                 XUngrabServer(dpy);
2051         }
2052         free(c);
2053         focus(NULL);
2054         updateclientlist();
2055         arrange(m);
2056 }
2057
2058 void
2059 unmapnotify(XEvent *e)
2060 {
2061         Client *c;
2062         XUnmapEvent *ev = &e->xunmap;
2063
2064         if ((c = wintoclient(ev->window))) {
2065                 if (ev->send_event)
2066                         setclientstate(c, WithdrawnState);
2067                 else
2068                         unmanage(c, 0);
2069         }
2070         else if ((c = wintosystrayicon(ev->window))) {
2071                 /* KLUDGE! sometimes icons occasionally unmap their windows, but do
2072                  * _not_ destroy them. We map those windows back */
2073                 XMapRaised(dpy, c->win);
2074                 updatesystray();
2075         }
2076 }
2077
2078 void
2079 updatebars(void)
2080 {
2081         unsigned int w;
2082         Monitor *m;
2083         XSetWindowAttributes wa = {
2084                 .override_redirect = True,
2085                 .background_pixmap = ParentRelative,
2086                 .event_mask = ButtonPressMask|ExposureMask
2087         };
2088         XClassHint ch = {"dwm", "dwm"};
2089         for (m = mons; m; m = m->next) {
2090                 if (m->barwin)
2091                         continue;
2092                 w = m->ww;
2093                 if (showsystray && m == systraytomon(m))
2094                         w -= getsystraywidth();
2095                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, w, bh, 0, DefaultDepth(dpy, screen),
2096                                 CopyFromParent, DefaultVisual(dpy, screen),
2097                                 CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
2098                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
2099                 if (showsystray && m == systraytomon(m))
2100                         XMapRaised(dpy, systray->win);
2101                 XMapRaised(dpy, m->barwin);
2102                 XSetClassHint(dpy, m->barwin, &ch);
2103         }
2104 }
2105
2106 void
2107 updatebarpos(Monitor *m)
2108 {
2109         m->wy = m->my;
2110         m->wh = m->mh;
2111         if (m->showbar) {
2112                 m->wh -= bh;
2113                 m->by = m->topbar ? m->wy : m->wy + m->wh;
2114                 m->wy = m->topbar ? m->wy + bh : m->wy;
2115         } else
2116                 m->by = -bh;
2117 }
2118
2119 void
2120 updateclientlist()
2121 {
2122         Client *c;
2123         Monitor *m;
2124
2125         XDeleteProperty(dpy, root, netatom[NetClientList]);
2126         for (m = mons; m; m = m->next)
2127                 for (c = m->clients; c; c = c->next)
2128                         XChangeProperty(dpy, root, netatom[NetClientList],
2129                                 XA_WINDOW, 32, PropModeAppend,
2130                                 (unsigned char *) &(c->win), 1);
2131 }
2132
2133 int
2134 updategeom(void)
2135 {
2136         int dirty = 0;
2137
2138 #ifdef XINERAMA
2139         if (XineramaIsActive(dpy)) {
2140                 int i, j, n, nn;
2141                 Client *c;
2142                 Monitor *m;
2143                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
2144                 XineramaScreenInfo *unique = NULL;
2145
2146                 for (n = 0, m = mons; m; m = m->next, n++);
2147                 /* only consider unique geometries as separate screens */
2148                 unique = ecalloc(nn, sizeof(XineramaScreenInfo));
2149                 for (i = 0, j = 0; i < nn; i++)
2150                         if (isuniquegeom(unique, j, &info[i]))
2151                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
2152                 XFree(info);
2153                 nn = j;
2154                 if (n <= nn) { /* new monitors available */
2155                         for (i = 0; i < (nn - n); i++) {
2156                                 for (m = mons; m && m->next; m = m->next);
2157                                 if (m)
2158                                         m->next = createmon();
2159                                 else
2160                                         mons = createmon();
2161                         }
2162                         for (i = 0, m = mons; i < nn && m; m = m->next, i++)
2163                                 if (i >= n
2164                                 || unique[i].x_org != m->mx || unique[i].y_org != m->my
2165                                 || unique[i].width != m->mw || unique[i].height != m->mh)
2166                                 {
2167                                         dirty = 1;
2168                                         m->num = i;
2169                                         m->mx = m->wx = unique[i].x_org;
2170                                         m->my = m->wy = unique[i].y_org;
2171                                         m->mw = m->ww = unique[i].width;
2172                                         m->mh = m->wh = unique[i].height;
2173                                         updatebarpos(m);
2174                                 }
2175                 } else { /* less monitors available nn < n */
2176                         for (i = nn; i < n; i++) {
2177                                 for (m = mons; m && m->next; m = m->next);
2178                                 while ((c = m->clients)) {
2179                                         dirty = 1;
2180                                         m->clients = c->next;
2181                                         detachstack(c);
2182                                         c->mon = mons;
2183                                         attach(c);
2184                                         attachstack(c);
2185                                 }
2186                                 if (m == selmon)
2187                                         selmon = mons;
2188                                 cleanupmon(m);
2189                         }
2190                 }
2191                 free(unique);
2192         } else
2193 #endif /* XINERAMA */
2194         { /* default monitor setup */
2195                 if (!mons)
2196                         mons = createmon();
2197                 if (mons->mw != sw || mons->mh != sh) {
2198                         dirty = 1;
2199                         mons->mw = mons->ww = sw;
2200                         mons->mh = mons->wh = sh;
2201                         updatebarpos(mons);
2202                 }
2203         }
2204         if (dirty) {
2205                 selmon = mons;
2206                 selmon = wintomon(root);
2207         }
2208         return dirty;
2209 }
2210
2211 void
2212 updatenumlockmask(void)
2213 {
2214         unsigned int i, j;
2215         XModifierKeymap *modmap;
2216
2217         numlockmask = 0;
2218         modmap = XGetModifierMapping(dpy);
2219         for (i = 0; i < 8; i++)
2220                 for (j = 0; j < modmap->max_keypermod; j++)
2221                         if (modmap->modifiermap[i * modmap->max_keypermod + j]
2222                                 == XKeysymToKeycode(dpy, XK_Num_Lock))
2223                                 numlockmask = (1 << i);
2224         XFreeModifiermap(modmap);
2225 }
2226
2227 void
2228 updatesizehints(Client *c)
2229 {
2230         long msize;
2231         XSizeHints size;
2232
2233         if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
2234                 /* size is uninitialized, ensure that size.flags aren't used */
2235                 size.flags = PSize;
2236         if (size.flags & PBaseSize) {
2237                 c->basew = size.base_width;
2238                 c->baseh = size.base_height;
2239         } else if (size.flags & PMinSize) {
2240                 c->basew = size.min_width;
2241                 c->baseh = size.min_height;
2242         } else
2243                 c->basew = c->baseh = 0;
2244         if (size.flags & PResizeInc) {
2245                 c->incw = size.width_inc;
2246                 c->inch = size.height_inc;
2247         } else
2248                 c->incw = c->inch = 0;
2249         if (size.flags & PMaxSize) {
2250                 c->maxw = size.max_width;
2251                 c->maxh = size.max_height;
2252         } else
2253                 c->maxw = c->maxh = 0;
2254         if (size.flags & PMinSize) {
2255                 c->minw = size.min_width;
2256                 c->minh = size.min_height;
2257         } else if (size.flags & PBaseSize) {
2258                 c->minw = size.base_width;
2259                 c->minh = size.base_height;
2260         } else
2261                 c->minw = c->minh = 0;
2262         if (size.flags & PAspect) {
2263                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2264                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2265         } else
2266                 c->maxa = c->mina = 0.0;
2267         c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
2268 }
2269
2270 void
2271 updatestatus(void)
2272 {
2273         Monitor* m;
2274         if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2275                 strcpy(stext, "dwm-"VERSION);
2276         for(m = mons; m; m = m->next)
2277                 drawbar(m);
2278 }
2279
2280 void
2281 updatesystrayicongeom(Client *i, int w, int h)
2282 {
2283         if (i) {
2284                 i->h = bh;
2285                 if (w == h)
2286                         i->w = bh;
2287                 else if (h == bh)
2288                         i->w = w;
2289                 else
2290                         i->w = (int) ((float)bh * ((float)w / (float)h));
2291                 applysizehints(i, &(i->x), &(i->y), &(i->w), &(i->h), False);
2292                 /* force icons into the systray dimenons if they don't want to */
2293                 if (i->h > bh) {
2294                         if (i->w == i->h)
2295                                 i->w = bh;
2296                         else
2297                                 i->w = (int) ((float)bh * ((float)i->w / (float)i->h));
2298                         i->h = bh;
2299                 }
2300         }
2301 }
2302
2303 void
2304 updatesystrayiconstate(Client *i, XPropertyEvent *ev)
2305 {
2306         long flags;
2307         int code = 0;
2308
2309         if (!showsystray || !i || ev->atom != xatom[XembedInfo] ||
2310                         !(flags = getatomprop(i, xatom[XembedInfo])))
2311                 return;
2312
2313         if (flags & XEMBED_MAPPED && !i->tags) {
2314                 i->tags = 1;
2315                 code = XEMBED_WINDOW_ACTIVATE;
2316                 XMapRaised(dpy, i->win);
2317                 setclientstate(i, NormalState);
2318         }
2319         else if (!(flags & XEMBED_MAPPED) && i->tags) {
2320                 i->tags = 0;
2321                 code = XEMBED_WINDOW_DEACTIVATE;
2322                 XUnmapWindow(dpy, i->win);
2323                 setclientstate(i, WithdrawnState);
2324         }
2325         else
2326                 return;
2327         sendevent(i->win, xatom[Xembed], StructureNotifyMask, CurrentTime, code, 0,
2328                         systray->win, XEMBED_EMBEDDED_VERSION);
2329 }
2330
2331 void
2332 updatesystray(void)
2333 {
2334         XSetWindowAttributes wa;
2335         XWindowChanges wc;
2336         Client *i;
2337         Monitor *m = systraytomon(NULL);
2338         unsigned int x = m->mx + m->mw;
2339         unsigned int w = 1;
2340
2341         if (!showsystray)
2342                 return;
2343         if (!systray) {
2344                 /* init systray */
2345                 if (!(systray = (Systray *)calloc(1, sizeof(Systray))))
2346                         die("fatal: could not malloc() %u bytes\n", sizeof(Systray));
2347                 systray->win = XCreateSimpleWindow(dpy, root, x, m->by, w, bh, 0, 0, scheme[SchemeSel][ColBg].pixel);
2348                 wa.event_mask        = ButtonPressMask | ExposureMask;
2349                 wa.override_redirect = True;
2350                 wa.background_pixel  = scheme[SchemeNorm][ColBg].pixel;
2351                 XSelectInput(dpy, systray->win, SubstructureNotifyMask);
2352                 XChangeProperty(dpy, systray->win, netatom[NetSystemTrayOrientation], XA_CARDINAL, 32,
2353                                 PropModeReplace, (unsigned char *)&netatom[NetSystemTrayOrientationHorz], 1);
2354                 XChangeWindowAttributes(dpy, systray->win, CWEventMask|CWOverrideRedirect|CWBackPixel, &wa);
2355                 XMapRaised(dpy, systray->win);
2356                 XSetSelectionOwner(dpy, netatom[NetSystemTray], systray->win, CurrentTime);
2357                 if (XGetSelectionOwner(dpy, netatom[NetSystemTray]) == systray->win) {
2358                         sendevent(root, xatom[Manager], StructureNotifyMask, CurrentTime, netatom[NetSystemTray], systray->win, 0, 0);
2359                         XSync(dpy, False);
2360                 }
2361                 else {
2362                         fprintf(stderr, "dwm: unable to obtain system tray.\n");
2363                         free(systray);
2364                         systray = NULL;
2365                         return;
2366                 }
2367         }
2368         for (w = 0, i = systray->icons; i; i = i->next) {
2369                 /* make sure the background color stays the same */
2370                 wa.background_pixel  = scheme[SchemeNorm][ColBg].pixel;
2371                 XChangeWindowAttributes(dpy, i->win, CWBackPixel, &wa);
2372                 XMapRaised(dpy, i->win);
2373                 w += systrayspacing;
2374                 i->x = w;
2375                 XMoveResizeWindow(dpy, i->win, i->x, 0, i->w, i->h);
2376                 w += i->w;
2377                 if (i->mon != m)
2378                         i->mon = m;
2379         }
2380         w = w ? w + systrayspacing : 1;
2381         x -= w;
2382         XMoveResizeWindow(dpy, systray->win, x, m->by, w, bh);
2383         wc.x = x; wc.y = m->by; wc.width = w; wc.height = bh;
2384         wc.stack_mode = Above; wc.sibling = m->barwin;
2385         XConfigureWindow(dpy, systray->win, CWX|CWY|CWWidth|CWHeight|CWSibling|CWStackMode, &wc);
2386         XMapWindow(dpy, systray->win);
2387         XMapSubwindows(dpy, systray->win);
2388         /* redraw background */
2389         XSetForeground(dpy, drw->gc, scheme[SchemeNorm][ColBg].pixel);
2390         XFillRectangle(dpy, systray->win, drw->gc, 0, 0, w, bh);
2391         XSync(dpy, False);
2392 }
2393
2394 void
2395 updatetitle(Client *c)
2396 {
2397         if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2398                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2399         if (c->name[0] == '\0') /* hack to mark broken clients */
2400                 strcpy(c->name, broken);
2401 }
2402
2403 void
2404 updatewindowtype(Client *c)
2405 {
2406         Atom state = getatomprop(c, netatom[NetWMState]);
2407         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2408
2409         if (state == netatom[NetWMFullscreen])
2410                 setfullscreen(c, 1);
2411         if (wtype == netatom[NetWMWindowTypeDialog])
2412                 c->isfloating = 1;
2413 }
2414
2415 void
2416 updatewmhints(Client *c)
2417 {
2418         XWMHints *wmh;
2419
2420         if ((wmh = XGetWMHints(dpy, c->win))) {
2421                 if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2422                         wmh->flags &= ~XUrgencyHint;
2423                         XSetWMHints(dpy, c->win, wmh);
2424                 } else
2425                         c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2426                 if (wmh->flags & InputHint)
2427                         c->neverfocus = !wmh->input;
2428                 else
2429                         c->neverfocus = 0;
2430                 XFree(wmh);
2431         }
2432 }
2433
2434 void
2435 view(const Arg *arg)
2436 {
2437         int i;
2438         unsigned int tmptag;
2439
2440         if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2441                 return;
2442         selmon->seltags ^= 1; /* toggle sel tagset */
2443         if (arg->ui & TAGMASK) {
2444                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2445                 selmon->pertag->prevtag = selmon->pertag->curtag;
2446
2447                 if (arg->ui == ~0)
2448                         selmon->pertag->curtag = 0;
2449                 else {
2450                         for (i = 0; !(arg->ui & 1 << i); i++) ;
2451                         selmon->pertag->curtag = i + 1;
2452                 }
2453         } else {
2454                 tmptag = selmon->pertag->prevtag;
2455                 selmon->pertag->prevtag = selmon->pertag->curtag;
2456                 selmon->pertag->curtag = tmptag;
2457         }
2458
2459         selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag];
2460         selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag];
2461         selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag];
2462         selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt];
2463         selmon->lt[selmon->sellt^1] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt^1];
2464
2465         if (selmon->showbar != selmon->pertag->showbars[selmon->pertag->curtag])
2466                 togglebar(NULL);
2467
2468         focus(NULL);
2469         arrange(selmon);
2470 }
2471
2472 Client *
2473 wintoclient(Window w)
2474 {
2475         Client *c;
2476         Monitor *m;
2477
2478         for (m = mons; m; m = m->next)
2479                 for (c = m->clients; c; c = c->next)
2480                         if (c->win == w)
2481                                 return c;
2482         return NULL;
2483 }
2484
2485 Client *
2486 wintosystrayicon(Window w) {
2487         Client *i = NULL;
2488
2489         if (!showsystray || !w)
2490                 return i;
2491         for (i = systray->icons; i && i->win != w; i = i->next) ;
2492         return i;
2493 }
2494
2495 Monitor *
2496 wintomon(Window w)
2497 {
2498         int x, y;
2499         Client *c;
2500         Monitor *m;
2501
2502         if (w == root && getrootptr(&x, &y))
2503                 return recttomon(x, y, 1, 1);
2504         for (m = mons; m; m = m->next)
2505                 if (w == m->barwin)
2506                         return m;
2507         if ((c = wintoclient(w)))
2508                 return c->mon;
2509         return selmon;
2510 }
2511
2512 /* There's no way to check accesses to destroyed windows, thus those cases are
2513  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2514  * default error handler, which may call exit. */
2515 int
2516 xerror(Display *dpy, XErrorEvent *ee)
2517 {
2518         if (ee->error_code == BadWindow
2519         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2520         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2521         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2522         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2523         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2524         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2525         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2526         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2527                 return 0;
2528         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2529                 ee->request_code, ee->error_code);
2530         return xerrorxlib(dpy, ee); /* may call exit */
2531 }
2532
2533 int
2534 xerrordummy(Display *dpy, XErrorEvent *ee)
2535 {
2536         return 0;
2537 }
2538
2539 /* Startup Error handler to check if another window manager
2540  * is already running. */
2541 int
2542 xerrorstart(Display *dpy, XErrorEvent *ee)
2543 {
2544         die("dwm: another window manager is already running");
2545         return -1;
2546 }
2547
2548 Monitor *
2549 systraytomon(Monitor *m) {
2550         Monitor *t;
2551         int i, n;
2552         if(!systraypinning) {
2553                 if(!m)
2554                         return selmon;
2555                 return m == selmon ? m : NULL;
2556         }
2557         for(n = 1, t = mons; t && t->next; n++, t = t->next) ;
2558         for(i = 1, t = mons; t && t->next && i < systraypinning; i++, t = t->next) ;
2559         if(systraypinningfailfirst && n < systraypinning)
2560                 return mons;
2561         return t;
2562 }
2563
2564 void
2565 zoom(const Arg *arg)
2566 {
2567         Client *c = selmon->sel;
2568
2569         if (!selmon->lt[selmon->sellt]->arrange
2570         || (selmon->sel && selmon->sel->isfloating))
2571                 return;
2572         if (c == nexttiled(selmon->clients))
2573                 if (!c || !(c = nexttiled(c->next)))
2574                         return;
2575         pop(c);
2576 }
2577
2578 int
2579 main(int argc, char *argv[])
2580 {
2581         if (argc == 2 && !strcmp("-v", argv[1]))
2582                 die("dwm-"VERSION);
2583         else if (argc != 1)
2584                 die("usage: dwm [-v]");
2585         if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2586                 fputs("warning: no locale support\n", stderr);
2587         if (!(dpy = XOpenDisplay(NULL)))
2588                 die("dwm: cannot open display");
2589         checkotherwm();
2590         setup();
2591 #ifdef __OpenBSD__
2592         if (pledge("stdio rpath proc exec", NULL) == -1)
2593                 die("pledge");
2594 #endif /* __OpenBSD__ */
2595         scan();
2596         run();
2597         cleanup();
2598         XCloseDisplay(dpy);
2599         return EXIT_SUCCESS;
2600 }