Dogcows Code - chaz/tint2/blob - src/launcher/xsettings-client.c

   1 /*
   2  * Copyright © 2001 Red Hat, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of Red Hat not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  Red Hat makes no representations about the
  11  * suitability of this software for any purpose.  It is provided "as is"
  12  * without express or implied warranty.
  13  *
  14  * RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL RED HAT
  16  * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  18  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  19  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  *
  21  * Author:  Owen Taylor, Red Hat, Inc.
  22  */
  23 #include <limits.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include <X11/Xlib.h>
  29 #include <X11/Xmd.h>            /* For CARD16 */
  30
  31 #include "xsettings-client.h"
  32 #include "server.h"
  33 #include "panel.h"
  34 #include "launcher.h"
  35
  36 struct _XSettingsClient
  37 {
  38         Display *display;
  39         int screen;
  40         XSettingsNotifyFunc notify;
  41         XSettingsWatchFunc watch;
  42         void *cb_data;
  43
  44         Window manager_window;
  45         XSettingsList *settings;
  46 };
  47
  48
  49 void xsettings_notify_cb (const char *name, XSettingsAction action, XSettingsSetting *setting, void *data)
  50 {
  51         //printf("xsettings_notify_cb\n");
  52         if ((action == XSETTINGS_ACTION_NEW || action == XSETTINGS_ACTION_CHANGED) && name != NULL && setting != NULL) {
  53                 if (!strcmp(name, "Net/IconThemeName") && setting->type == XSETTINGS_TYPE_STRING) {
  54                         if (icon_theme_name) {
  55                                 if (strcmp(icon_theme_name, setting->data.v_string) == 0)
  56                                         return;
  57                                 free(icon_theme_name);
  58                         }
  59                         icon_theme_name = strdup(setting->data.v_string);
  60
  61                         int i;
  62                         for (i = 0 ; i < nb_panel ; i++) {
  63                                 Launcher *launcher = &panel1[i].launcher;
  64                                 cleanup_launcher_theme(launcher);
  65                                 launcher_load_themes(launcher);
  66                                 launcher_load_icons(launcher);
  67                                 launcher->area.resize = 1;
  68                         }
  69                 }
  70         }
  71 }
  72
  73
  74 static void notify_changes (XSettingsClient *client, XSettingsList *old_list)
  75 {
  76         XSettingsList *old_iter = old_list;
  77         XSettingsList *new_iter = client->settings;
  78
  79         if (!client->notify)
  80                 return;
  81
  82         while (old_iter || new_iter) {
  83                 int cmp;
  84
  85                 if (old_iter && new_iter)
  86                         cmp = strcmp (old_iter->setting->name, new_iter->setting->name);
  87                 else if (old_iter)
  88                         cmp = -1;
  89                 else
  90                         cmp = 1;
  91
  92                 if (cmp < 0) {
  93                         client->notify (old_iter->setting->name, XSETTINGS_ACTION_DELETED, NULL, client->cb_data);
  94                 }
  95                 else if (cmp == 0) {
  96                         if (!xsettings_setting_equal (old_iter->setting, new_iter->setting))
  97                                 client->notify (old_iter->setting->name, XSETTINGS_ACTION_CHANGED, new_iter->setting, client->cb_data);
  98                 }
  99                 else {
 100                         client->notify (new_iter->setting->name, XSETTINGS_ACTION_NEW, new_iter->setting, client->cb_data);
 101                 }
 102
 103                 if (old_iter)
 104                         old_iter = old_iter->next;
 105                 if (new_iter)
 106                         new_iter = new_iter->next;
 107         }
 108 }
 109
 110
 111 static int ignore_errors (Display *display, XErrorEvent *event)
 112 {
 113         return True;
 114 }
 115
 116 static char local_byte_order = '\0';
 117
 118 #define BYTES_LEFT(buffer) ((buffer)->data + (buffer)->len - (buffer)->pos)
 119
 120 static XSettingsResult fetch_card16 (XSettingsBuffer *buffer, CARD16 *result)
 121 {
 122         CARD16 x;
 123
 124         if (BYTES_LEFT (buffer) < 2)
 125                 return XSETTINGS_ACCESS;
 126
 127         x = *(CARD16 *)buffer->pos;
 128         buffer->pos += 2;
 129
 130         if (buffer->byte_order == local_byte_order)
 131                 *result = x;
 132         else
 133                 *result = (x << 8) | (x >> 8);
 134
 135         return XSETTINGS_SUCCESS;
 136 }
 137
 138
 139 static XSettingsResult fetch_ushort (XSettingsBuffer *buffer, unsigned short  *result)
 140 {
 141         CARD16 x;
 142         XSettingsResult r;
 143
 144         r = fetch_card16 (buffer, &x);
 145         if (r == XSETTINGS_SUCCESS)
 146                 *result = x;
 147
 148         return r;
 149 }
 150
 151
 152 static XSettingsResult fetch_card32 (XSettingsBuffer *buffer, CARD32 *result)
 153 {
 154         CARD32 x;
 155
 156         if (BYTES_LEFT (buffer) < 4)
 157                 return XSETTINGS_ACCESS;
 158
 159         x = *(CARD32 *)buffer->pos;
 160         buffer->pos += 4;
 161
 162         if (buffer->byte_order == local_byte_order)
 163                 *result = x;
 164         else
 165                 *result = (x << 24) | ((x & 0xff00) << 8) | ((x & 0xff0000) >> 8) | (x >> 24);
 166
 167         return XSETTINGS_SUCCESS;
 168 }
 169
 170 static XSettingsResult fetch_card8 (XSettingsBuffer *buffer, CARD8 *result)
 171 {
 172   if (BYTES_LEFT (buffer) < 1)
 173     return XSETTINGS_ACCESS;
 174
 175   *result = *(CARD8 *)buffer->pos;
 176   buffer->pos += 1;
 177
 178   return XSETTINGS_SUCCESS;
 179 }
 180
 181 #define XSETTINGS_PAD(n,m) ((n + m - 1) & (~(m-1)))
 182
 183 static XSettingsList *parse_settings (unsigned char *data, size_t len)
 184 {
 185         XSettingsBuffer buffer;
 186         XSettingsResult result = XSETTINGS_SUCCESS;
 187         XSettingsList *settings = NULL;
 188         CARD32 serial;
 189         CARD32 n_entries;
 190         CARD32 i;
 191         XSettingsSetting *setting = NULL;
 192
 193         local_byte_order = xsettings_byte_order ();
 194
 195         buffer.pos = buffer.data = data;
 196         buffer.len = len;
 197
 198         result = fetch_card8 (&buffer, (CARD8*)&buffer.byte_order);
 199         if (buffer.byte_order != MSBFirst && buffer.byte_order != LSBFirst) {
 200                 fprintf (stderr, "Invalid byte order %x in XSETTINGS property\n", buffer.byte_order);
 201                 result = XSETTINGS_FAILED;
 202                 goto out;
 203         }
 204
 205         buffer.pos += 3;
 206
 207         result = fetch_card32 (&buffer, &serial);
 208         if (result != XSETTINGS_SUCCESS)
 209                 goto out;
 210
 211         result = fetch_card32 (&buffer, &n_entries);
 212         if (result != XSETTINGS_SUCCESS)
 213                 goto out;
 214
 215         for (i = 0; i < n_entries; i++) {
 216                 CARD8 type;
 217                 CARD16 name_len;
 218                 CARD32 v_int;
 219                 size_t pad_len;
 220
 221                 result = fetch_card8 (&buffer, &type);
 222                 if (result != XSETTINGS_SUCCESS)
 223                         goto out;
 224
 225                 buffer.pos += 1;
 226
 227                 result = fetch_card16 (&buffer, &name_len);
 228                 if (result != XSETTINGS_SUCCESS)
 229                         goto out;
 230
 231                 pad_len = XSETTINGS_PAD(name_len, 4);
 232                 if (BYTES_LEFT (&buffer) < pad_len) {
 233                         result = XSETTINGS_ACCESS;
 234                         goto out;
 235                 }
 236
 237                 setting = malloc (sizeof *setting);
 238                 if (!setting) {
 239                         result = XSETTINGS_NO_MEM;
 240                         goto out;
 241                 }
 242                 setting->type = XSETTINGS_TYPE_INT; /* No allocated memory */
 243
 244                 setting->name = malloc (name_len + 1);
 245                 if (!setting->name) {
 246                         result = XSETTINGS_NO_MEM;
 247                         goto out;
 248                 }
 249
 250                 memcpy (setting->name, buffer.pos, name_len);
 251                 setting->name[name_len] = '\0';
 252                 buffer.pos += pad_len;
 253
 254                 result = fetch_card32 (&buffer, &v_int);
 255                 if (result != XSETTINGS_SUCCESS)
 256                         goto out;
 257                 setting->last_change_serial = v_int;
 258
 259                 switch (type) {
 260                         case XSETTINGS_TYPE_INT:
 261                         result = fetch_card32 (&buffer, &v_int);
 262                         if (result != XSETTINGS_SUCCESS)
 263                                 goto out;
 264                         setting->data.v_int = (INT32)v_int;
 265                         break;
 266                         case XSETTINGS_TYPE_STRING:
 267                         result = fetch_card32 (&buffer, &v_int);
 268                         if (result != XSETTINGS_SUCCESS)
 269                                 goto out;
 270
 271                         pad_len = XSETTINGS_PAD (v_int, 4);
 272                         if (v_int + 1 == 0 || /* Guard against wrap-around */
 273                         BYTES_LEFT (&buffer) < pad_len) {
 274                                 result = XSETTINGS_ACCESS;
 275                                 goto out;
 276                         }
 277
 278                         setting->data.v_string = malloc (v_int + 1);
 279                         if (!setting->data.v_string) {
 280                                 result = XSETTINGS_NO_MEM;
 281                                 goto out;
 282                         }
 283
 284                         memcpy (setting->data.v_string, buffer.pos, v_int);
 285                         setting->data.v_string[v_int] = '\0';
 286                         buffer.pos += pad_len;
 287                         break;
 288                         case XSETTINGS_TYPE_COLOR:
 289                         result = fetch_ushort (&buffer, &setting->data.v_color.red);
 290                         if (result != XSETTINGS_SUCCESS)
 291                                 goto out;
 292                         result = fetch_ushort (&buffer, &setting->data.v_color.green);
 293                         if (result != XSETTINGS_SUCCESS)
 294                                 goto out;
 295                         result = fetch_ushort (&buffer, &setting->data.v_color.blue);
 296                         if (result != XSETTINGS_SUCCESS)
 297                                 goto out;
 298                         result = fetch_ushort (&buffer, &setting->data.v_color.alpha);
 299                         if (result != XSETTINGS_SUCCESS)
 300                                 goto out;
 301                         break;
 302                         default:
 303                         /* Quietly ignore unknown types */
 304                         break;
 305                 }
 306
 307                 setting->type = type;
 308
 309                 result = xsettings_list_insert (&settings, setting);
 310                 if (result != XSETTINGS_SUCCESS)
 311                 goto out;
 312
 313                 setting = NULL;
 314         }
 315
 316         out:
 317
 318         if (result != XSETTINGS_SUCCESS) {
 319                 switch (result) {
 320                         case XSETTINGS_NO_MEM:
 321                         fprintf(stderr, "Out of memory reading XSETTINGS property\n");
 322                         break;
 323                         case XSETTINGS_ACCESS:
 324                         fprintf(stderr, "Invalid XSETTINGS property (read off end)\n");
 325                         break;
 326                         case XSETTINGS_DUPLICATE_ENTRY:
 327                         fprintf (stderr, "Duplicate XSETTINGS entry for '%s'\n", setting->name);
 328                         case XSETTINGS_FAILED:
 329                         case XSETTINGS_SUCCESS:
 330                         case XSETTINGS_NO_ENTRY:
 331                         break;
 332                 }
 333
 334                 if (setting)
 335                         xsettings_setting_free (setting);
 336
 337                 xsettings_list_free (settings);
 338                 settings = NULL;
 339         }
 340
 341         return settings;
 342 }
 343
 344
 345 static void read_settings (XSettingsClient *client)
 346 {
 347         Atom type;
 348         int format;
 349         unsigned long n_items;
 350         unsigned long bytes_after;
 351         unsigned char *data;
 352         int result;
 353
 354         int (*old_handler) (Display *, XErrorEvent *);
 355
 356         XSettingsList *old_list = client->settings;
 357         client->settings = NULL;
 358
 359         old_handler = XSetErrorHandler (ignore_errors);
 360         result = XGetWindowProperty (client->display, client->manager_window, server.atom._XSETTINGS_SETTINGS, 0, LONG_MAX, False, server.atom._XSETTINGS_SETTINGS, &type, &format, &n_items, &bytes_after, &data);
 361         XSetErrorHandler (old_handler);
 362
 363         if (result == Success && type == server.atom._XSETTINGS_SETTINGS) {
 364                 if (format != 8) {
 365                         fprintf (stderr, "Invalid format for XSETTINGS property %d", format);
 366                 }
 367                 else
 368                         client->settings = parse_settings (data, n_items);
 369                 XFree (data);
 370         }
 371
 372         notify_changes (client, old_list);
 373         xsettings_list_free (old_list);
 374 }
 375
 376
 377 static void check_manager_window (XSettingsClient *client)
 378 {
 379         if (client->manager_window && client->watch)
 380                 client->watch (client->manager_window, False, 0, client->cb_data);
 381
 382         XGrabServer (client->display);
 383
 384         client->manager_window = XGetSelectionOwner (server.dsp, server.atom._XSETTINGS_SCREEN);
 385         if (client->manager_window)
 386                 XSelectInput (server.dsp, client->manager_window, PropertyChangeMask | StructureNotifyMask);
 387
 388         XUngrabServer (client->display);
 389         XFlush (client->display);
 390
 391         if (client->manager_window && client->watch)
 392                 client->watch (client->manager_window, True, PropertyChangeMask | StructureNotifyMask, client->cb_data);
 393
 394         read_settings (client);
 395 }
 396
 397
 398 XSettingsClient *xsettings_client_new (Display *display, int screen, XSettingsNotifyFunc notify, XSettingsWatchFunc watch, void *cb_data)
 399 {
 400         XSettingsClient *client;
 401
 402         client = malloc (sizeof *client);
 403         if (!client)
 404                 return NULL;
 405
 406         client->display = display;
 407         client->screen = screen;
 408         client->notify = notify;
 409         client->watch = watch;
 410         client->cb_data = cb_data;
 411
 412         client->manager_window = None;
 413         client->settings = NULL;
 414
 415         if (client->watch)
 416                 client->watch (RootWindow (display, screen), True, StructureNotifyMask, client->cb_data);
 417
 418         check_manager_window (client);
 419
 420         if (client->manager_window == None) {
 421                 printf("NO XSETTINGS manager, tint2 use config 'launcher_icon_theme'.\n");
 422                 free (client);
 423                 return NULL;
 424         }
 425         else
 426                 return client;
 427 }
 428
 429
 430 void xsettings_client_destroy (XSettingsClient *client)
 431 {
 432         if (client->watch)
 433                 client->watch (RootWindow (client->display, client->screen), False, 0, client->cb_data);
 434         if (client->manager_window && client->watch)
 435                 client->watch (client->manager_window, False, 0, client->cb_data);
 436
 437         xsettings_list_free (client->settings);
 438         free (client);
 439 }
 440
 441
 442 XSettingsResult xsettings_client_get_setting (XSettingsClient *client, const char *name, XSettingsSetting **setting)
 443 {
 444         XSettingsSetting *search = xsettings_list_lookup (client->settings, name);
 445         if (search) {
 446                 *setting = xsettings_setting_copy (search);
 447                 return *setting ? XSETTINGS_SUCCESS : XSETTINGS_NO_MEM;
 448         }
 449         else
 450                 return XSETTINGS_NO_ENTRY;
 451 }
 452
 453
 454 Bool xsettings_client_process_event (XSettingsClient *client, XEvent *xev)
 455 {
 456         /* The checks here will not unlikely cause us to reread
 457         * the properties from the manager window a number of
 458         * times when the manager changes from A->B. But manager changes
 459         * are going to be pretty rare.
 460         */
 461         if (xev->xany.window == RootWindow (server.dsp, server.screen)) {
 462                 if (xev->xany.type == ClientMessage && xev->xclient.message_type == server.atom.MANAGER) {
 463                         check_manager_window (client);
 464                         return True;
 465                 }
 466         }
 467         else if (xev->xany.window == client->manager_window) {
 468                 if (xev->xany.type == DestroyNotify) {
 469                         check_manager_window (client);
 470                         return True;
 471                 }
 472                 else if (xev->xany.type == PropertyNotify) {
 473                         read_settings (client);
 474                         return True;
 475                 }
 476         }
 477
 478         return False;
 479 }
 480