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