screen.c 8.8 KB
Newer Older
rhp's avatar
...  
rhp committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
/* Metacity X screen handler */

/* 
 * Copyright (C) 2001 Havoc Pennington
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */
rhp's avatar
...  
rhp committed
21

rhp's avatar
...  
rhp committed
22 23
#include "screen.h"
#include "util.h"
rhp's avatar
...  
rhp committed
24
#include "errors.h"
rhp's avatar
...  
rhp committed
25
#include "window.h"
rhp's avatar
...  
rhp committed
26
#include "colors.h"
rhp's avatar
...  
rhp committed
27
#include "uislave.h"
rhp's avatar
...  
rhp committed
28

rhp's avatar
...  
rhp committed
29
#include <X11/cursorfont.h>
rhp's avatar
...  
rhp committed
30 31
#include <locale.h>
#include <string.h>
rhp's avatar
...  
rhp committed
32

rhp's avatar
...  
rhp committed
33 34 35 36 37 38 39
static void  ui_slave_func   (MetaUISlave *uislave,
                              MetaMessage *message,
                              gpointer     data);
static char* get_screen_name (MetaDisplay *display,
                              int          number);


rhp's avatar
...  
rhp committed
40 41 42 43 44
MetaScreen*
meta_screen_new (MetaDisplay *display,
                 int          number)
{
  MetaScreen *screen;
rhp's avatar
...  
rhp committed
45 46
  Window xroot;
  Display *xdisplay;
rhp's avatar
...  
rhp committed
47 48
  Cursor cursor;
  
rhp's avatar
...  
rhp committed
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
  /* Only display->name, display->xdisplay, and display->error_traps
   * can really be used in this function, since normally screens are
   * created from the MetaDisplay constructor
   */
  
  xdisplay = display->xdisplay;
  
  meta_verbose ("Trying screen %d on display '%s'\n",
                number, display->name);

  xroot = RootWindow (xdisplay, number);

  /* FVWM checks for None here, I don't know if this
   * ever actually happens
   */
  if (xroot == None)
    {
      meta_warning (_("Screen %d on display '%s' is invalid\n"),
                    number, display->name);
      return NULL;
    }

  /* Select our root window events */
  meta_error_trap_push (display);
  XSelectInput (xdisplay,
                xroot,
                SubstructureRedirectMask | SubstructureNotifyMask |
                ColormapChangeMask | PropertyChangeMask |
                LeaveWindowMask | EnterWindowMask |
                ButtonPressMask | ButtonReleaseMask);
  if (meta_error_trap_pop (display) != Success)
    {
      meta_warning (_("Screen %d on display '%s' already has a window manager\n"),
                    number, display->name);
      return NULL;
    }
rhp's avatar
...  
rhp committed
85 86 87 88

  cursor = XCreateFontCursor (display->xdisplay, XC_left_ptr);
  XDefineCursor (display->xdisplay, xroot, cursor);
  XFreeCursor (display->xdisplay, cursor);
rhp's avatar
...  
rhp committed
89 90 91
  
  screen = g_new (MetaScreen, 1);

rhp's avatar
...  
rhp committed
92
  screen->display = display;
rhp's avatar
...  
rhp committed
93
  screen->number = number;
rhp's avatar
...  
rhp committed
94
  screen->screen_name = get_screen_name (display, number);
rhp's avatar
...  
rhp committed
95 96
  screen->xscreen = ScreenOfDisplay (xdisplay, number);
  screen->xroot = xroot;  
rhp's avatar
...  
rhp committed
97
  screen->pango_context = NULL;
rhp's avatar
...  
rhp committed
98
  
rhp's avatar
...  
rhp committed
99
  screen->engine = &meta_default_engine;
rhp's avatar
...  
rhp committed
100 101 102 103

  screen->uislave = meta_ui_slave_new (screen->screen_name,
                                       ui_slave_func,
                                       screen);
rhp's avatar
...  
rhp committed
104
  
rhp's avatar
...  
rhp committed
105 106
  meta_verbose ("Added screen %d ('%s') root 0x%lx\n",
                screen->number, screen->screen_name, screen->xroot);  
rhp's avatar
...  
rhp committed
107 108 109 110 111 112 113
  
  return screen;
}

void
meta_screen_free (MetaScreen *screen)
{
rhp's avatar
...  
rhp committed
114
  meta_ui_slave_free (screen->uislave);
rhp's avatar
...  
rhp committed
115 116
  if (screen->pango_context)
    g_object_unref (G_OBJECT (screen->pango_context));
rhp's avatar
...  
rhp committed
117
  g_free (screen->screen_name);
rhp's avatar
...  
rhp committed
118 119 120
  g_free (screen);
}

rhp's avatar
...  
rhp committed
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
void
meta_screen_manage_all_windows (MetaScreen *screen)
{
  Window ignored1, ignored2;
  Window *children;
  unsigned int n_children;
  int i;

  /* Must grab server to avoid obvious race condition */
  meta_display_grab (screen->display);

  meta_error_trap_push (screen->display);
  
  XQueryTree (screen->display->xdisplay,
              screen->xroot,
              &ignored1, &ignored2, &children, &n_children);
rhp's avatar
...  
rhp committed
137

rhp's avatar
...  
rhp committed
138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156
  if (meta_error_trap_pop (screen->display))
    {
      meta_display_ungrab (screen->display);
      return;
    }
  
  i = 0;
  while (i < n_children)
    {
      meta_window_new (screen->display, children[i]);

      ++i;
    }

  meta_display_ungrab (screen->display);
  
  if (children)
    XFree (children);
}
rhp's avatar
...  
rhp committed
157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273

static GC
get_gc_func (PangoContext *context, PangoColor *color, GC base_gc)
{
  MetaScreen *screen;
  GC new_gc;
  XGCValues vals;
  int copy_mask = (GCFunction | GCPlaneMask | GCForeground | GCBackground |
                   GCLineWidth | GCLineStyle | GCCapStyle | GCJoinStyle |
                   GCFillStyle | GCFillRule | GCTile | GCStipple | GCTileStipXOrigin |
                   GCTileStipYOrigin | GCFont | GCSubwindowMode |
                   GCGraphicsExposures | GCClipXOrigin | GCClipYOrigin |
                   GCDashOffset | GCArcMode);

  screen = g_object_get_data (G_OBJECT (context), "meta-screen");
  
  new_gc = XCreateGC (screen->display->xdisplay,
                      screen->xroot,
                      0, 
                      &vals);

  XCopyGC (screen->display->xdisplay, base_gc, copy_mask, new_gc);

  vals.foreground = meta_screen_get_x_pixel (screen, color);
  XChangeGC (screen->display->xdisplay, new_gc, GCForeground, &vals);

  return new_gc;
}

static void
free_gc_func (PangoContext *context, GC gc)
{
  MetaScreen *screen;

  screen = g_object_get_data (G_OBJECT (context), "meta-screen");

  XFreeGC (screen->display->xdisplay, gc);
}

static char*
get_default_language (void)
{
  /* Copied from GTK, Copyright 2001 Red Hat Inc. */
  gchar *lang;
  gchar *p;
  
  lang = g_strdup (setlocale (LC_CTYPE, NULL));
  p = strchr (lang, '.');
  if (p)
    *p = '\0';
  p = strchr (lang, '@');
  if (p)
    *p = '\0';

  return lang;
}

PangoContext*
meta_screen_get_pango_context (MetaScreen *screen,
                               const PangoFontDescription *desc,
                               PangoDirection direction)
{
  if (screen->pango_context == NULL)
    {
      PangoContext *ctx;
      char *lang;
      
      /* Copied from GDK, Copyright 2001 Red Hat, Inc. */
#ifdef HAVE_XFT
      static int use_xft = -1;
      if (use_xft == -1)
        {
          char *val = g_getenv ("META_USE_XFT");
          
          use_xft = val && (atoi (val) != 0);
        }
      
      if (use_xft)
        ctx = pango_xft_get_context (screen->display, screen->number);
      else
#endif /* HAVE_XFT */
        ctx = pango_x_get_context (screen->display->xdisplay);

      g_object_set_data (G_OBJECT (ctx), "meta-screen", screen);

      pango_x_context_set_funcs (ctx, get_gc_func, free_gc_func);
      
      lang = get_default_language ();  
      pango_context_set_lang (ctx, lang);
      g_free (lang);

      /* FIXME these two lines are wrong;
       * we should be storing a context for each direction/desc,
       * so that the args to meta_screen_get_pango_context()
       * are honored.
       */
      pango_context_set_base_dir (ctx, direction);
      pango_context_set_font_description (ctx, desc);
      
      screen->pango_context = ctx;
    }
  
  return screen->pango_context;
}

MetaScreen*
meta_screen_for_x_screen (Screen *xscreen)
{
  MetaDisplay *display;
  
  display = meta_display_for_x_display (DisplayOfScreen (xscreen));

  if (display == NULL)
    return NULL;
  
  return meta_display_screen_for_x_screen (display, xscreen);
}
rhp's avatar
...  
rhp committed
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334

static void
ui_slave_func (MetaUISlave *uislave,
               MetaMessage *message,
               gpointer     data)
{
  switch (message->header.message_code)
    {
    case MetaMessageCheckCode:
      meta_verbose ("Received UI slave check message version: %s host alias: %s messages version: %d\n",
                    message->check.metacity_version,
                    message->check.host_alias,
                    message->check.messages_version);

      if (strcmp (message->check.metacity_version, VERSION) != 0 ||
          strcmp (message->check.host_alias, HOST_ALIAS) != 0 ||
          message->check.messages_version != META_MESSAGES_VERSION)
        {
          meta_warning ("metacity-uislave has the wrong version; must use the one compiled with metacity\n");
          meta_ui_slave_disable (uislave);
        }
      
      break;

    default:
      meta_verbose ("Received unhandled message from UI slave: %d\n",
                    message->header.message_code);
      break;
    }
}


static char*
get_screen_name (MetaDisplay *display,
                 int          number)
{
  char *p;
  char *dname;
  char *scr;
  
  /* DisplayString gives us a sort of canonical display,
   * vs. the user-entered name from XDisplayName()
   */
  dname = g_strdup (DisplayString (display->xdisplay));

  /* Change display name to specify this screen.
   */
  p = strrchr (dname, ':');
  if (p)
    {
      p = strchr (p, '.');
      if (p)
        *p = '\0';
    }
  
  scr = g_strdup_printf ("%s.%d", dname, number);

  g_free (dname);

  return scr;
}