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 Bool sel_screen;
  24
  25 char *bartext, tag[256];
  26 int screen;
  27
  28 Brush brush = {0};
  29 Client *clients = NULL;
  30 Client *stack = NULL;
  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 static int
  66 win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
  67 {
  68         Atom real;
  69         int format;
  70         unsigned long res, extra;
  71         int status;
  72
  73         status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
  74                         &res, &extra, prop);
  75
  76         if(status != Success || *prop == 0) {
  77                 return 0;
  78         }
  79         if(res == 0) {
  80                 free((void *) *prop);
  81         }
  82         return res;
  83 }
  84
  85 int
  86 win_proto(Window w)
  87 {
  88         Atom *protocols;
  89         long res;
  90         int protos = 0;
  91         int i;
  92
  93         res = win_property(w, wm_atom[WMProtocols], XA_ATOM, 20L,
  94                         ((unsigned char **) &protocols));
  95         if(res <= 0) {
  96                 return protos;
  97         }
  98         for(i = 0; i < res; i++) {
  99                 if(protocols[i] == wm_atom[WMDelete])
 100                         protos |= WM_PROTOCOL_DELWIN;
 101         }
 102         free((char *) protocols);
 103         return protos;
 104 }
 105
 106 void
 107 send_message(Window w, Atom a, long value)
 108 {
 109         XEvent e;
 110
 111         e.type = ClientMessage;
 112         e.xclient.window = w;
 113         e.xclient.message_type = a;
 114         e.xclient.format = 32;
 115         e.xclient.data.l[0] = value;
 116         e.xclient.data.l[1] = CurrentTime;
 117         XSendEvent(dpy, w, False, NoEventMask, &e);
 118         XFlush(dpy);
 119 }
 120
 121 /*
 122  * There's no way to check accesses to destroyed windows, thus
 123  * those cases are ignored (especially on UnmapNotify's).
 124  * Other types of errors call Xlib's default error handler, which
 125  * calls exit().
 126  */
 127 int
 128 error_handler(Display *dpy, XErrorEvent *error)
 129 {
 130         if(error->error_code == BadWindow
 131                         || (error->request_code == X_SetInputFocus
 132                                 && error->error_code == BadMatch)
 133                         || (error->request_code == X_PolyText8
 134                                 && error->error_code == BadDrawable)
 135                         || (error->request_code == X_PolyFillRectangle
 136                                 && error->error_code == BadDrawable)
 137                         || (error->request_code == X_PolySegment
 138                                 && error->error_code == BadDrawable)
 139                         || (error->request_code == X_ConfigureWindow
 140                                 && error->error_code == BadMatch)
 141                         || (error->request_code == X_GrabKey
 142                                 && error->error_code == BadAccess))
 143                 return 0;
 144         fprintf(stderr, "gridwm: fatal error: request code=%d, error code=%d\n",
 145                         error->request_code, error->error_code);
 146         return x_error_handler(dpy, error); /* may call exit() */
 147 }
 148
 149 /*
 150  * Startup Error handler to check if another window manager
 151  * is already running.
 152  */
 153 static int
 154 startup_error_handler(Display *dpy, XErrorEvent *error)
 155 {
 156         other_wm_running = True;
 157         return -1;
 158 }
 159
 160 static void
 161 cleanup()
 162 {
 163         /*
 164         Client *c;
 165         for(c=client; c; c=c->next)
 166                 reparent_client(c, root, c->sel->rect.x, c->sel->rect.y);
 167         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 168         */
 169 }
 170
 171 int
 172 main(int argc, char *argv[])
 173 {
 174         int i;
 175         XSetWindowAttributes wa;
 176         unsigned int mask;
 177         Window w;
 178         XEvent ev;
 179
 180         /* command line args */
 181         for(i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
 182                 switch (argv[i][1]) {
 183                 case 'v':
 184                         fprintf(stdout, "%s", version);
 185                         exit(0);
 186                         break;
 187                 default:
 188                         usage();
 189                         break;
 190                 }
 191         }
 192
 193         dpy = XOpenDisplay(0);
 194         if(!dpy)
 195                 error("gridwm: cannot connect X server\n");
 196
 197         screen = DefaultScreen(dpy);
 198         root = RootWindow(dpy, screen);
 199
 200         /* check if another WM is already running */
 201         other_wm_running = False;
 202         XSetErrorHandler(startup_error_handler);
 203         /* this causes an error if some other WM is running */
 204         XSelectInput(dpy, root, SubstructureRedirectMask);
 205         XFlush(dpy);
 206
 207         if(other_wm_running)
 208                 error("gridwm: another window manager is already running\n");
 209
 210         rect.x = rect.y = 0;
 211         rect.width = DisplayWidth(dpy, screen);
 212         rect.height = DisplayHeight(dpy, screen);
 213         sel_screen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
 214
 215         XSetErrorHandler(0);
 216         x_error_handler = XSetErrorHandler(error_handler);
 217
 218         /* init atoms */
 219         wm_atom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
 220         wm_atom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
 221         net_atom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
 222         net_atom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 223
 224         XChangeProperty(dpy, root, net_atom[NetSupported], XA_ATOM, 32,
 225                         PropModeReplace, (unsigned char *) net_atom, NetLast);
 226
 227
 228         /* init cursors */
 229         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
 230         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
 231         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
 232
 233         update_keys();
 234
 235         brush.drawable = XCreatePixmap(dpy, root, rect.width, rect.height,
 236                         DefaultDepth(dpy, screen));
 237         brush.gc = XCreateGC(dpy, root, 0, 0);
 238
 239         /* style */
 240         loadcolors(dpy, screen, &brush, BGCOLOR, FGCOLOR, BORDERCOLOR);
 241         loadfont(dpy, &brush.font, FONT);
 242
 243         wa.override_redirect = 1;
 244         wa.background_pixmap = ParentRelative;
 245         wa.event_mask = ExposureMask;
 246
 247         barrect = rect;
 248         barrect.height = labelheight(&brush.font);
 249         barrect.y = rect.height - barrect.height;
 250         barwin = XCreateWindow(dpy, root, barrect.x, barrect.y,
 251                         barrect.width, barrect.height, 0, DefaultDepth(dpy, screen),
 252                         CopyFromParent, DefaultVisual(dpy, screen),
 253                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 254         bartext = NULL;
 255         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 256         XMapRaised(dpy, barwin);
 257         draw_bar();
 258
 259         wa.event_mask = SubstructureRedirectMask | EnterWindowMask \
 260                                         | LeaveWindowMask;
 261         wa.cursor = cursor[CurNormal];
 262         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
 263
 264         scan_wins();
 265
 266         while(running) {
 267                 XNextEvent(dpy, &ev);
 268                 if(handler[ev.type])
 269                         (handler[ev.type]) (&ev); /* call handler */
 270         }
 271
 272         cleanup();
 273         XCloseDisplay(dpy);
 274
 275         return 0;
 276 }