wm.c

   1 /*
   2  * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
   3  * See LICENSE file for license details.
   4  */
   5
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9
  10 #include <X11/cursorfont.h>
  11 #include <X11/Xatom.h>
  12 #include <X11/Xproto.h>
  13
  14 #include "wm.h"
  15
  16 /* X structs */
  17 Display *dpy;
  18 Window root, barwin;
  19 Atom wm_atom[WMLast], net_atom[NetLast];
  20 Cursor cursor[CurLast];
  21 XRectangle rect, barrect;
  22 Bool running = True;
  23 Client *client = NULL;
  24
  25 char *bartext, tag[256];
  26 int screen, sel_screen;
  27 unsigned int lock_mask, numlock_mask;
  28
  29 /* draw structs */
  30 Brush brush = {0};
  31
  32 enum { WM_PROTOCOL_DELWIN = 1 };
  33
  34 static Bool other_wm_running;
  35 static int (*x_error_handler) (Display *, XErrorEvent *);
  36 static char version[] = "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  37
  38 static void
  39 usage()
  40 {
  41         fputs("usage: gridwm [-v]\n", stderr);
  42         exit(1);
  43 }
  44
  45 static void
  46 scan_wins()
  47 {
  48         unsigned int i, num;
  49         Window *wins;
  50         XWindowAttributes wa;
  51         Window d1, d2;
  52
  53         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  54                 for(i = 0; i < num; i++) {
  55                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  56                                 continue;
  57                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  58                                 continue;
  59                         if(wa.map_state == IsViewable)
  60                                 manage(create_client(wins[i], &wa));
  61                 }
  62         }
  63         if(wins)
  64                 XFree(wins);
  65 }
  66
  67 static int
  68 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  69 {
  70         Atom real;
  71         int format;
  72         unsigned long res, extra;
  73         int status;
  74
  75         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  76                         &res, &extra, prop);
  77
  78         if(status != Success || *prop == NULL) {
  79                 return 0;
  80         }
  81         if(res == 0)
  82                 free((void *) *prop);
  83         return res;
  84 }
  85
  86 int
  87 win_proto(Window w)
  88 {
  89         Atom *protocols;
  90         long res;
  91         int protos = 0;
  92         int i;
  93
  94         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L,
  95                         ((unsigned char **) &protocols));
  96         if(res <= 0) {
  97                 return protos;
  98         }
  99         for(i = 0; i < res; i++) {
 100                 if(protocols[i] == wm_atom[WMDelete])
 101                         protos |= WM_PROTOCOL_DELWIN;
 102         }
 103         free((char *) protocols);
 104         return protos;
 105 }
 106
 107 /*
 108  * There's no way to check accesses to destroyed windows, thus
 109  * those cases are ignored (especially on UnmapNotify's).
 110  * Other types of errors call Xlib's default error handler, which
 111  * calls exit().
 112  */
 113 static int
 114 error_handler(Display *dpy, XErrorEvent *error)
 115 {
 116         if(error->error_code == BadWindow
 117                         || (error->request_code == X_SetInputFocus
 118                                 && error->error_code == BadMatch)
 119                         || (error->request_code == X_PolyText8
 120                                 && error->error_code == BadDrawable)
 121                         || (error->request_code == X_PolyFillRectangle
 122                                 && error->error_code == BadDrawable)
 123                         || (error->request_code == X_PolySegment
 124                                 && error->error_code == BadDrawable)
 125                         || (error->request_code == X_ConfigureWindow
 126                                 && error->error_code == BadMatch)
 127                         || (error->request_code == X_GrabKey
 128                                 && error->error_code == BadAccess))
 129                 return 0;
 130         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 131                         error->request_code, error->error_code);
 132         return x_error_handler(dpy, error); /* may call exit() */
 133 }
 134
 135 /*
 136  * Startup Error handler to check if another window manager
 137  * is already running.
 138  */
 139 static int
 140 startup_error_handler(Display *dpy, XErrorEvent *error)
 141 {
 142         other_wm_running = True;
 143         return -1;
 144 }
 145
 146 static void
 147 init_lock_keys()
 148 {
 149         XModifierKeymap *modmap;
 150         KeyCode numlock;
 151         int i;
 152         static int masks[] = {
 153                 ShiftMask, LockMask, ControlMask, Mod1Mask,
 154                 Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
 155         };
 156
 157         numlock_mask = 0;
 158         modmap = XGetModifierMapping(dpy);
 159         numlock = XKeysymToKeycode(dpy, XStringToKeysym("Num_Lock"));
 160
 161         if(modmap && modmap->max_keypermod > 0) {
 162                 int max = (sizeof(masks) / sizeof(int)) * modmap->max_keypermod;
 163                 for(i = 0; i < max; i++)
 164                         if(numlock && (modmap->modifiermap[i] == numlock))
 165                                 numlock_mask = masks[i / modmap->max_keypermod];
 166         }
 167         XFreeModifiermap(modmap);
 168
 169         lock_mask = 255 & ~(numlock_mask | LockMask);
 170 }
 171
 172 static void
 173 cleanup()
 174 {
 175         /*
 176         Client *c;
 177         for(c=client; c; c=c->next)
 178                 reparent_client(c, root, c->sel->rect.x, c->sel->rect.y);
 179         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 180         */
 181 }
 182
 183 int
 184 main(int argc, char *argv[])
 185 {
 186         int i;
 187         XSetWindowAttributes wa;
 188         unsigned int mask;
 189         Window w;
 190         XEvent ev;
 191
 192         /* command line args */
 193         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 194                 switch (argv[i][1]) {
 195                 case 'v':
 196                         fprintf(stdout, "%s", version);
 197                         exit(0);
 198                         break;
 199                 default:
 200                         usage();
 201                         break;
 202                 }
 203         }
 204
 205         dpy = XOpenDisplay(0);
 206         if(!dpy)
 207                 error("gridwm: cannot connect X server\n");
 208
 209         screen = DefaultScreen(dpy);
 210         root = RootWindow(dpy, screen);
 211
 212         /* check if another WM is already running */
 213         other_wm_running = False;
 214         XSetErrorHandler(startup_error_handler);
 215         /* this causes an error if some other WM is running */
 216         XSelectInput(dpy, root, SubstructureRedirectMask);
 217         XFlush(dpy);
 218
 219         if(other_wm_running)
 220                 error("gridwm: another window manager is already running\n");
 221
 222         rect.x = rect.y = 0;
 223         rect.width = DisplayWidth(dpy, screen);
 224         rect.height = DisplayHeight(dpy, screen);
 225         sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 226
 227         XSetErrorHandler(0);
 228         x_error_handler = XSetErrorHandler(error_handler);
 229
 230         /* init atoms */
 231         wm_atom[WMState] = XInternAtom(dpy, "WM_STATE", False);
 232         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 233         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 234         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 235         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 236
 237         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 238                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 239
 240
 241         /* init cursors */
 242         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 243         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 244         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 245
 246         init_lock_keys();
 247
 248         brush.drawable = XCreatePixmap(dpy, root, rect.width, rect.height,
 249                         DefaultDepth(dpy, screen));
 250         brush.gc = XCreateGC(dpy, root, 0, 0);
 251
 252         /* style */
 253         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 254         loadfont(dpy, &brush.font, FONT);
 255
 256         wa.override_redirect = 1;
 257         wa.background_pixmap = ParentRelative;
 258         wa.event_mask = ExposureMask;
 259
 260         barrect = rect;
 261         barrect.height = labelheight(&brush.font);
 262         barrect.y = rect.height - barrect.height;
 263         barwin = XCreateWindow(dpy, root, barrect.x, barrect.y,
 264                         barrect.width, barrect.height, 0, DefaultDepth(dpy, screen),
 265                         CopyFromParent, DefaultVisual(dpy, screen),
 266                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 267         bartext = NULL;
 268         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 269         XMapRaised(dpy, barwin);
 270         draw_bar();
 271
 272         wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
 273         wa.cursor = cursor[CurNormal];
 274         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 275
 276         scan_wins();
 277
 278         while(running) {
 279                 XNextEvent(dpy, &ev);
 280                 if(handler[ev.type])
 281                         (handler[ev.type]) (&ev); /* call handler */
 282         }
 283
 284         cleanup();
 285         XCloseDisplay(dpy);
 286
 287         return 0;
 288 }