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 net_atom[NetLast];
  20 Cursor cursor[CurLast];
  21 XRectangle rect, barrect;
  22 Bool running = True;
  23 Client *clients = NULL;
  24
  25 char *bartext, tag[256];
  26 int screen, sel_screen;
  27
  28 /* draw structs */
  29 Brush brush = {0};
  30
  31 enum { WM_PROTOCOL_DELWIN = 1 };
  32
  33 static Bool other_wm_running;
  34 static int (*x_error_handler) (Display *, XErrorEvent *);
  35 static char version[] = "gridwm - " VERSION ", (C)opyright MMVI Anselm R. Garbe\n";
  36
  37 static void
  38 usage()
  39 {
  40         fputs("usage: gridwm [-v]\n", stderr);
  41         exit(1);
  42 }
  43
  44 static void
  45 scan_wins()
  46 {
  47         unsigned int i, num;
  48         Window *wins;
  49         XWindowAttributes wa;
  50         Window d1, d2;
  51
  52         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  53                 for(i = 0; i < num; i++) {
  54                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
  55                                 continue;
  56                         if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
  57                                 continue;
  58                         if(wa.map_state == IsViewable)
  59                                 manage(create_client(wins[i], &wa));
  60                 }
  61         }
  62         if(wins)
  63                 XFree(wins);
  64 }
  65
  66 /*
  67  * There's no way to check accesses to destroyed windows, thus
  68  * those cases are ignored (especially on UnmapNotify's).
  69  * Other types of errors call Xlib's default error handler, which
  70  * calls exit().
  71  */
  72 static int
  73 error_handler(Display *dpy, XErrorEvent *error)
  74 {
  75         if(error->error_code == BadWindow
  76                         || (error->request_code == X_SetInputFocus
  77                                 && error->error_code == BadMatch)
  78                         || (error->request_code == X_PolyText8
  79                                 && error->error_code == BadDrawable)
  80                         || (error->request_code == X_PolyFillRectangle
  81                                 && error->error_code == BadDrawable)
  82                         || (error->request_code == X_PolySegment
  83                                 && error->error_code == BadDrawable)
  84                         || (error->request_code == X_ConfigureWindow
  85                                 && error->error_code == BadMatch)
  86                         || (error->request_code == X_GrabKey
  87                                 && error->error_code == BadAccess))
  88                 return 0;
  89         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
  90                         error->request_code, error->error_code);
  91         return x_error_handler(dpy, error); /* may call exit() */
  92 }
  93
  94 /*
  95  * Startup Error handler to check if another window manager
  96  * is already running.
  97  */
  98 static int
  99 startup_error_handler(Display *dpy, XErrorEvent *error)
 100 {
 101         other_wm_running = True;
 102         return -1;
 103 }
 104
 105 static void
 106 cleanup()
 107 {
 108         /*
 109         Client *c;
 110         for(c=client; c; c=c->next)
 111                 reparent_client(c, root, c->sel->rect.x, c->sel->rect.y);
 112         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 113         */
 114 }
 115
 116 int
 117 main(int argc, char *argv[])
 118 {
 119         int i;
 120         XSetWindowAttributes wa;
 121         unsigned int mask;
 122         Window w;
 123         XEvent ev;
 124
 125         /* command line args */
 126         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 127                 switch (argv[i][1]) {
 128                 case 'v':
 129                         fprintf(stdout, "%s", version);
 130                         exit(0);
 131                         break;
 132                 default:
 133                         usage();
 134                         break;
 135                 }
 136         }
 137
 138         dpy = XOpenDisplay(0);
 139         if(!dpy)
 140                 error("gridwm: cannot connect X server\n");
 141
 142         screen = DefaultScreen(dpy);
 143         root = RootWindow(dpy, screen);
 144
 145         /* check if another WM is already running */
 146         other_wm_running = False;
 147         XSetErrorHandler(startup_error_handler);
 148         /* this causes an error if some other WM is running */
 149         XSelectInput(dpy, root, SubstructureRedirectMask);
 150         XFlush(dpy);
 151
 152         if(other_wm_running)
 153                 error("gridwm: another window manager is already running\n");
 154
 155         rect.x = rect.y = 0;
 156         rect.width = DisplayWidth(dpy, screen);
 157         rect.height = DisplayHeight(dpy, screen);
 158         sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 159
 160         XSetErrorHandler(0);
 161         x_error_handler = XSetErrorHandler(error_handler);
 162
 163         /* init atoms */
 164         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 165         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 166
 167         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 168                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 169
 170
 171         /* init cursors */
 172         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 173         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 174         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 175
 176         update_keys();
 177
 178         brush.drawable = XCreatePixmap(dpy, root, rect.width, rect.height,
 179                         DefaultDepth(dpy, screen));
 180         brush.gc = XCreateGC(dpy, root, 0, 0);
 181
 182         /* style */
 183         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 184         loadfont(dpy, &brush.font, FONT);
 185
 186         wa.override_redirect = 1;
 187         wa.background_pixmap = ParentRelative;
 188         wa.event_mask = ExposureMask;
 189
 190         barrect = rect;
 191         barrect.height = labelheight(&brush.font);
 192         barrect.y = rect.height - barrect.height;
 193         barwin = XCreateWindow(dpy, root, barrect.x, barrect.y,
 194                         barrect.width, barrect.height, 0, DefaultDepth(dpy, screen),
 195                         CopyFromParent, DefaultVisual(dpy, screen),
 196                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 197         bartext = NULL;
 198         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 199         XMapRaised(dpy, barwin);
 200         draw_bar();
 201
 202         wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
 203                                         | LeaveWindowMask;
 204         wa.cursor = cursor[CurNormal];
 205         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 206
 207         scan_wins();
 208
 209         while(running) {
 210                 XNextEvent(dpy, &ev);
 211                 if(handler[ev.type])
 212                         (handler[ev.type]) (&ev); /* call handler */
 213         }
 214
 215         cleanup();
 216         XCloseDisplay(dpy);
 217
 218         return 0;
 219 }