Pileus Git - ~andy/gtk/blob - gtk/gtkprintbackend.c

   1 /* GTK - The GIMP Toolkit
   2  * gtkprintbackend.h: Abstract printer backend interfaces
   3  * Copyright (C) 2003, Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "config.h"
  22 #include <string.h>
  23
  24 #include <gmodule.h>
  25
  26 #include "gtkintl.h"
  27 #include "gtkmodules.h"
  28 #include "gtkmarshalers.h"
  29 #include "gtkprivate.h"
  30 #include "gtkprintbackend.h"
  31
  32 #define GTK_PRINT_BACKEND_GET_PRIVATE(o)  \
  33    (G_TYPE_INSTANCE_GET_PRIVATE ((o), GTK_TYPE_PRINT_BACKEND, GtkPrintBackendPrivate))
  34
  35 static void gtk_print_backend_dispose      (GObject      *object);
  36 static void gtk_print_backend_set_property (GObject      *object,
  37                                             guint         prop_id,
  38                                             const GValue *value,
  39                                             GParamSpec   *pspec);
  40 static void gtk_print_backend_get_property (GObject      *object,
  41                                             guint         prop_id,
  42                                             GValue       *value,
  43                                             GParamSpec   *pspec);
  44
  45 struct _GtkPrintBackendPrivate
  46 {
  47   GHashTable *printers;
  48   guint printer_list_requested : 1;
  49   guint printer_list_done : 1;
  50   GtkPrintBackendStatus status;
  51   char **auth_info_required;
  52   char **auth_info;
  53 };
  54
  55 enum {
  56   PRINTER_LIST_CHANGED,
  57   PRINTER_LIST_DONE,
  58   PRINTER_ADDED,
  59   PRINTER_REMOVED,
  60   PRINTER_STATUS_CHANGED,
  61   REQUEST_PASSWORD,
  62   LAST_SIGNAL
  63 };
  64
  65 static guint signals[LAST_SIGNAL] = { 0 };
  66
  67 enum
  68 {
  69   PROP_ZERO,
  70   PROP_STATUS
  71 };
  72
  73 static GObjectClass *backend_parent_class;
  74
  75 GQuark
  76 gtk_print_backend_error_quark (void)
  77 {
  78   static GQuark quark = 0;
  79   if (quark == 0)
  80     quark = g_quark_from_static_string ("gtk-print-backend-error-quark");
  81   return quark;
  82 }
  83
  84 /*****************************************
  85  *     GtkPrintBackendModule modules     *
  86  *****************************************/
  87
  88 typedef struct _GtkPrintBackendModule GtkPrintBackendModule;
  89 typedef struct _GtkPrintBackendModuleClass GtkPrintBackendModuleClass;
  90
  91 struct _GtkPrintBackendModule
  92 {
  93   GTypeModule parent_instance;
  94
  95   GModule *library;
  96
  97   void             (*init)     (GTypeModule    *module);
  98   void             (*exit)     (void);
  99   GtkPrintBackend* (*create)   (void);
 100
 101   gchar *path;
 102 };
 103
 104 struct _GtkPrintBackendModuleClass
 105 {
 106   GTypeModuleClass parent_class;
 107 };
 108
 109 G_DEFINE_TYPE (GtkPrintBackendModule, _gtk_print_backend_module, G_TYPE_TYPE_MODULE)
 110 #define GTK_TYPE_PRINT_BACKEND_MODULE      (_gtk_print_backend_module_get_type ())
 111 #define GTK_PRINT_BACKEND_MODULE(module)   (G_TYPE_CHECK_INSTANCE_CAST ((module), GTK_TYPE_PRINT_BACKEND_MODULE, GtkPrintBackendModule))
 112
 113 static GSList *loaded_backends;
 114
 115 static gboolean
 116 gtk_print_backend_module_load (GTypeModule *module)
 117 {
 118   GtkPrintBackendModule *pb_module = GTK_PRINT_BACKEND_MODULE (module);
 119   gpointer initp, exitp, createp;
 120
 121   pb_module->library = g_module_open (pb_module->path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
 122   if (!pb_module->library)
 123     {
 124       g_warning ("%s", g_module_error());
 125       return FALSE;
 126     }
 127
 128   /* extract symbols from the lib */
 129   if (!g_module_symbol (pb_module->library, "pb_module_init",
 130                         &initp) ||
 131       !g_module_symbol (pb_module->library, "pb_module_exit",
 132                         &exitp) ||
 133       !g_module_symbol (pb_module->library, "pb_module_create",
 134                         &createp))
 135     {
 136       g_warning ("%s", g_module_error());
 137       g_module_close (pb_module->library);
 138
 139       return FALSE;
 140     }
 141
 142   pb_module->init = initp;
 143   pb_module->exit = exitp;
 144   pb_module->create = createp;
 145
 146   /* call the printbackend's init function to let it */
 147   /* setup anything it needs to set up. */
 148   pb_module->init (module);
 149
 150   return TRUE;
 151 }
 152
 153 static void
 154 gtk_print_backend_module_unload (GTypeModule *module)
 155 {
 156   GtkPrintBackendModule *pb_module = GTK_PRINT_BACKEND_MODULE (module);
 157
 158   pb_module->exit();
 159
 160   g_module_close (pb_module->library);
 161   pb_module->library = NULL;
 162
 163   pb_module->init = NULL;
 164   pb_module->exit = NULL;
 165   pb_module->create = NULL;
 166 }
 167
 168 /* This only will ever be called if an error occurs during
 169  * initialization
 170  */
 171 static void
 172 gtk_print_backend_module_finalize (GObject *object)
 173 {
 174   GtkPrintBackendModule *module = GTK_PRINT_BACKEND_MODULE (object);
 175
 176   g_free (module->path);
 177
 178   G_OBJECT_CLASS (_gtk_print_backend_module_parent_class)->finalize (object);
 179 }
 180
 181 static void
 182 _gtk_print_backend_module_class_init (GtkPrintBackendModuleClass *class)
 183 {
 184   GTypeModuleClass *module_class = G_TYPE_MODULE_CLASS (class);
 185   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 186
 187   module_class->load = gtk_print_backend_module_load;
 188   module_class->unload = gtk_print_backend_module_unload;
 189
 190   gobject_class->finalize = gtk_print_backend_module_finalize;
 191 }
 192
 193 static void
 194 gtk_print_backend_set_property (GObject      *object,
 195                                 guint         prop_id,
 196                                 const GValue *value,
 197                                 GParamSpec   *pspec)
 198 {
 199   GtkPrintBackend *backend = GTK_PRINT_BACKEND (object);
 200   GtkPrintBackendPrivate *priv;
 201
 202   priv = backend->priv = GTK_PRINT_BACKEND_GET_PRIVATE (backend);
 203
 204   switch (prop_id)
 205     {
 206     case PROP_STATUS:
 207       priv->status = g_value_get_int (value);
 208       break;
 209     default:
 210       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 211       break;
 212     }
 213 }
 214
 215 static void
 216 gtk_print_backend_get_property (GObject    *object,
 217                                 guint       prop_id,
 218                                 GValue     *value,
 219                                 GParamSpec *pspec)
 220 {
 221   GtkPrintBackend *backend = GTK_PRINT_BACKEND (object);
 222   GtkPrintBackendPrivate *priv;
 223
 224   priv = backend->priv = GTK_PRINT_BACKEND_GET_PRIVATE (backend);
 225
 226   switch (prop_id)
 227     {
 228     case PROP_STATUS:
 229       g_value_set_int (value, priv->status);
 230       break;
 231     default:
 232       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 233       break;
 234     }
 235 }
 236
 237 static void
 238 _gtk_print_backend_module_init (GtkPrintBackendModule *pb_module)
 239 {
 240 }
 241
 242 static GtkPrintBackend *
 243 _gtk_print_backend_module_create (GtkPrintBackendModule *pb_module)
 244 {
 245   GtkPrintBackend *pb;
 246
 247   if (g_type_module_use (G_TYPE_MODULE (pb_module)))
 248     {
 249       pb = pb_module->create ();
 250       g_type_module_unuse (G_TYPE_MODULE (pb_module));
 251       return pb;
 252     }
 253   return NULL;
 254 }
 255
 256 static GtkPrintBackend *
 257 _gtk_print_backend_create (const gchar *backend_name)
 258 {
 259   GSList *l;
 260   gchar *module_path;
 261   gchar *full_name;
 262   GtkPrintBackendModule *pb_module;
 263   GtkPrintBackend *pb;
 264
 265   for (l = loaded_backends; l != NULL; l = l->next)
 266     {
 267       pb_module = l->data;
 268
 269       if (strcmp (G_TYPE_MODULE (pb_module)->name, backend_name) == 0)
 270         return _gtk_print_backend_module_create (pb_module);
 271     }
 272
 273   pb = NULL;
 274   if (g_module_supported ())
 275     {
 276       full_name = g_strconcat ("printbackend-", backend_name, NULL);
 277       module_path = _gtk_find_module (full_name, "printbackends");
 278       g_free (full_name);
 279
 280       if (module_path)
 281         {
 282           pb_module = g_object_new (GTK_TYPE_PRINT_BACKEND_MODULE, NULL);
 283
 284           g_type_module_set_name (G_TYPE_MODULE (pb_module), backend_name);
 285           pb_module->path = g_strdup (module_path);
 286
 287           loaded_backends = g_slist_prepend (loaded_backends,
 288                                              pb_module);
 289
 290           pb = _gtk_print_backend_module_create (pb_module);
 291
 292           /* Increase use-count so that we don't unload print backends.
 293            * There is a problem with module unloading in the cups module,
 294            * see cups_dispatch_watch_finalize for details.
 295            */
 296           g_type_module_use (G_TYPE_MODULE (pb_module));
 297         }
 298
 299       g_free (module_path);
 300     }
 301
 302   return pb;
 303 }
 304
 305 /**
 306  * gtk_printer_backend_load_modules:
 307  *
 308  * Return value: (element-type GtkPrintBackend) (transfer container):
 309  */
 310 GList *
 311 gtk_print_backend_load_modules (void)
 312 {
 313   GList *result;
 314   GtkPrintBackend *backend;
 315   gchar *setting;
 316   gchar **backends;
 317   gint i;
 318   GtkSettings *settings;
 319
 320   result = NULL;
 321
 322   settings = gtk_settings_get_default ();
 323   if (settings)
 324     g_object_get (settings, "gtk-print-backends", &setting, NULL);
 325   else
 326     setting = g_strdup (GTK_PRINT_BACKENDS);
 327
 328   backends = g_strsplit (setting, ",", -1);
 329
 330   for (i = 0; backends[i]; i++)
 331     {
 332       g_strchug (backends[i]);
 333       g_strchomp (backends[i]);
 334       backend = _gtk_print_backend_create (backends[i]);
 335
 336       if (backend)
 337         result = g_list_append (result, backend);
 338     }
 339
 340   g_strfreev (backends);
 341   g_free (setting);
 342
 343   return result;
 344 }
 345
 346 /*****************************************
 347  *             GtkPrintBackend           *
 348  *****************************************/
 349
 350 G_DEFINE_TYPE (GtkPrintBackend, gtk_print_backend, G_TYPE_OBJECT)
 351
 352 static void                 fallback_printer_request_details       (GtkPrinter          *printer);
 353 static gboolean             fallback_printer_mark_conflicts        (GtkPrinter          *printer,
 354                                                                     GtkPrinterOptionSet *options);
 355 static gboolean             fallback_printer_get_hard_margins      (GtkPrinter          *printer,
 356                                                                     gdouble             *top,
 357                                                                     gdouble             *bottom,
 358                                                                     gdouble             *left,
 359                                                                     gdouble             *right);
 360 static GList *              fallback_printer_list_papers           (GtkPrinter          *printer);
 361 static GtkPageSetup *       fallback_printer_get_default_page_size (GtkPrinter          *printer);
 362 static GtkPrintCapabilities fallback_printer_get_capabilities      (GtkPrinter          *printer);
 363 static void                 request_password                       (GtkPrintBackend     *backend,
 364                                                                     gpointer             auth_info_required,
 365                                                                     gpointer             auth_info_default,
 366                                                                     gpointer             auth_info_display,
 367                                                                     gpointer             auth_info_visible,
 368                                                                     const gchar         *prompt);
 369
 370 static void
 371 gtk_print_backend_class_init (GtkPrintBackendClass *class)
 372 {
 373   GObjectClass *object_class;
 374   object_class = (GObjectClass *) class;
 375
 376   backend_parent_class = g_type_class_peek_parent (class);
 377
 378   object_class->dispose = gtk_print_backend_dispose;
 379   object_class->set_property = gtk_print_backend_set_property;
 380   object_class->get_property = gtk_print_backend_get_property;
 381
 382   class->printer_request_details = fallback_printer_request_details;
 383   class->printer_mark_conflicts = fallback_printer_mark_conflicts;
 384   class->printer_get_hard_margins = fallback_printer_get_hard_margins;
 385   class->printer_list_papers = fallback_printer_list_papers;
 386   class->printer_get_default_page_size = fallback_printer_get_default_page_size;
 387   class->printer_get_capabilities = fallback_printer_get_capabilities;
 388   class->request_password = request_password;
 389
 390   g_object_class_install_property (object_class,
 391                                    PROP_STATUS,
 392                                    g_param_spec_int ("status",
 393                                                      "Status",
 394                                                      "The status of the print backend",
 395                                                      GTK_PRINT_BACKEND_STATUS_UNKNOWN,
 396                                                      GTK_PRINT_BACKEND_STATUS_UNAVAILABLE,
 397                                                      GTK_PRINT_BACKEND_STATUS_UNKNOWN,
 398                                                      GTK_PARAM_READWRITE));
 399
 400   g_type_class_add_private (class, sizeof (GtkPrintBackendPrivate));
 401
 402   signals[PRINTER_LIST_CHANGED] =
 403     g_signal_new (I_("printer-list-changed"),
 404                   G_TYPE_FROM_CLASS (class),
 405                   G_SIGNAL_RUN_LAST,
 406                   G_STRUCT_OFFSET (GtkPrintBackendClass, printer_list_changed),
 407                   NULL, NULL,
 408                   g_cclosure_marshal_VOID__VOID,
 409                   G_TYPE_NONE, 0);
 410   signals[PRINTER_LIST_DONE] =
 411     g_signal_new (I_("printer-list-done"),
 412                     G_TYPE_FROM_CLASS (class),
 413                     G_SIGNAL_RUN_LAST,
 414                     G_STRUCT_OFFSET (GtkPrintBackendClass, printer_list_done),
 415                     NULL, NULL,
 416                     g_cclosure_marshal_VOID__VOID,
 417                     G_TYPE_NONE, 0);
 418   signals[PRINTER_ADDED] =
 419     g_signal_new (I_("printer-added"),
 420                   G_TYPE_FROM_CLASS (class),
 421                   G_SIGNAL_RUN_LAST,
 422                   G_STRUCT_OFFSET (GtkPrintBackendClass, printer_added),
 423                   NULL, NULL,
 424                   g_cclosure_marshal_VOID__OBJECT,
 425                   G_TYPE_NONE, 1, GTK_TYPE_PRINTER);
 426   signals[PRINTER_REMOVED] =
 427     g_signal_new (I_("printer-removed"),
 428                   G_TYPE_FROM_CLASS (class),
 429                   G_SIGNAL_RUN_LAST,
 430                   G_STRUCT_OFFSET (GtkPrintBackendClass, printer_removed),
 431                   NULL, NULL,
 432                   g_cclosure_marshal_VOID__OBJECT,
 433                   G_TYPE_NONE, 1, GTK_TYPE_PRINTER);
 434   signals[PRINTER_STATUS_CHANGED] =
 435     g_signal_new (I_("printer-status-changed"),
 436                   G_TYPE_FROM_CLASS (class),
 437                   G_SIGNAL_RUN_LAST,
 438                   G_STRUCT_OFFSET (GtkPrintBackendClass, printer_status_changed),
 439                   NULL, NULL,
 440                   g_cclosure_marshal_VOID__OBJECT,
 441                   G_TYPE_NONE, 1, GTK_TYPE_PRINTER);
 442   signals[REQUEST_PASSWORD] =
 443     g_signal_new (I_("request-password"),
 444                   G_TYPE_FROM_CLASS (class),
 445                   G_SIGNAL_RUN_LAST,
 446                   G_STRUCT_OFFSET (GtkPrintBackendClass, request_password),
 447                   NULL, NULL,
 448                   _gtk_marshal_VOID__POINTER_POINTER_POINTER_POINTER_STRING,
 449                   G_TYPE_NONE, 5, G_TYPE_POINTER, G_TYPE_POINTER, G_TYPE_POINTER, G_TYPE_POINTER, G_TYPE_STRING);
 450 }
 451
 452 static void
 453 gtk_print_backend_init (GtkPrintBackend *backend)
 454 {
 455   GtkPrintBackendPrivate *priv;
 456
 457   priv = backend->priv = GTK_PRINT_BACKEND_GET_PRIVATE (backend);
 458
 459   priv->printers = g_hash_table_new_full (g_str_hash, g_str_equal,
 460                                           (GDestroyNotify) g_free,
 461                                           (GDestroyNotify) g_object_unref);
 462   priv->auth_info_required = NULL;
 463   priv->auth_info = NULL;
 464 }
 465
 466 static void
 467 gtk_print_backend_dispose (GObject *object)
 468 {
 469   GtkPrintBackend *backend;
 470   GtkPrintBackendPrivate *priv;
 471
 472   backend = GTK_PRINT_BACKEND (object);
 473   priv = backend->priv;
 474
 475   /* We unref the printers in dispose, not in finalize so that
 476    * we can break refcount cycles with gtk_print_backend_destroy
 477    */
 478   if (priv->printers)
 479     {
 480       g_hash_table_destroy (priv->printers);
 481       priv->printers = NULL;
 482     }
 483
 484   backend_parent_class->dispose (object);
 485 }
 486
 487
 488 static void
 489 fallback_printer_request_details (GtkPrinter *printer)
 490 {
 491 }
 492
 493 static gboolean
 494 fallback_printer_mark_conflicts (GtkPrinter          *printer,
 495                                  GtkPrinterOptionSet *options)
 496 {
 497   return FALSE;
 498 }
 499
 500 static gboolean
 501 fallback_printer_get_hard_margins (GtkPrinter *printer,
 502                                    gdouble    *top,
 503                                    gdouble    *bottom,
 504                                    gdouble    *left,
 505                                    gdouble    *right)
 506 {
 507   return FALSE;
 508 }
 509
 510 static GList *
 511 fallback_printer_list_papers (GtkPrinter *printer)
 512 {
 513   return NULL;
 514 }
 515
 516 static GtkPageSetup *
 517 fallback_printer_get_default_page_size (GtkPrinter *printer)
 518 {
 519   return NULL;
 520 }
 521
 522 static GtkPrintCapabilities
 523 fallback_printer_get_capabilities (GtkPrinter *printer)
 524 {
 525   return 0;
 526 }
 527
 528
 529 static void
 530 printer_hash_to_sorted_active_list (const gchar  *key,
 531                                     gpointer      value,
 532                                     GList       **out_list)
 533 {
 534   GtkPrinter *printer;
 535
 536   printer = GTK_PRINTER (value);
 537
 538   if (gtk_printer_get_name (printer) == NULL)
 539     return;
 540
 541   if (!gtk_printer_is_active (printer))
 542     return;
 543
 544   *out_list = g_list_insert_sorted (*out_list, value, (GCompareFunc) gtk_printer_compare);
 545 }
 546
 547
 548 void
 549 gtk_print_backend_add_printer (GtkPrintBackend *backend,
 550                                GtkPrinter      *printer)
 551 {
 552   GtkPrintBackendPrivate *priv;
 553
 554   g_return_if_fail (GTK_IS_PRINT_BACKEND (backend));
 555
 556   priv = backend->priv;
 557
 558   if (!priv->printers)
 559     return;
 560
 561   g_hash_table_insert (priv->printers,
 562                        g_strdup (gtk_printer_get_name (printer)),
 563                        g_object_ref (printer));
 564 }
 565
 566 void
 567 gtk_print_backend_remove_printer (GtkPrintBackend *backend,
 568                                   GtkPrinter      *printer)
 569 {
 570   GtkPrintBackendPrivate *priv;
 571
 572   g_return_if_fail (GTK_IS_PRINT_BACKEND (backend));
 573   priv = backend->priv;
 574
 575   if (!priv->printers)
 576     return;
 577
 578   g_hash_table_remove (priv->printers,
 579                        gtk_printer_get_name (printer));
 580 }
 581
 582 void
 583 gtk_print_backend_set_list_done (GtkPrintBackend *backend)
 584 {
 585   if (!backend->priv->printer_list_done)
 586     {
 587       backend->priv->printer_list_done = TRUE;
 588       g_signal_emit (backend, signals[PRINTER_LIST_DONE], 0);
 589     }
 590 }
 591
 592
 593 /**
 594  * gtk_print_backend_get_printer_list:
 595  *
 596  * Return value: (element-type GtkPrinter) (transfer container):
 597  */
 598 GList *
 599 gtk_print_backend_get_printer_list (GtkPrintBackend *backend)
 600 {
 601   GtkPrintBackendPrivate *priv;
 602   GList *result;
 603
 604   g_return_val_if_fail (GTK_IS_PRINT_BACKEND (backend), NULL);
 605
 606   priv = backend->priv;
 607
 608   result = NULL;
 609   if (priv->printers != NULL)
 610     g_hash_table_foreach (priv->printers,
 611                           (GHFunc) printer_hash_to_sorted_active_list,
 612                           &result);
 613
 614   if (!priv->printer_list_requested && priv->printers != NULL)
 615     {
 616       if (GTK_PRINT_BACKEND_GET_CLASS (backend)->request_printer_list)
 617         GTK_PRINT_BACKEND_GET_CLASS (backend)->request_printer_list (backend);
 618       priv->printer_list_requested = TRUE;
 619     }
 620
 621   return result;
 622 }
 623
 624 gboolean
 625 gtk_print_backend_printer_list_is_done (GtkPrintBackend *print_backend)
 626 {
 627   g_return_val_if_fail (GTK_IS_PRINT_BACKEND (print_backend), TRUE);
 628
 629   return print_backend->priv->printer_list_done;
 630 }
 631
 632 GtkPrinter *
 633 gtk_print_backend_find_printer (GtkPrintBackend *backend,
 634                                 const gchar     *printer_name)
 635 {
 636   GtkPrintBackendPrivate *priv;
 637   GtkPrinter *printer;
 638
 639   g_return_val_if_fail (GTK_IS_PRINT_BACKEND (backend), NULL);
 640
 641   priv = backend->priv;
 642
 643   if (priv->printers)
 644     printer = g_hash_table_lookup (priv->printers, printer_name);
 645   else
 646     printer = NULL;
 647
 648   return printer;
 649 }
 650
 651 void
 652 gtk_print_backend_print_stream (GtkPrintBackend        *backend,
 653                                 GtkPrintJob            *job,
 654                                 GIOChannel             *data_io,
 655                                 GtkPrintJobCompleteFunc callback,
 656                                 gpointer                user_data,
 657                                 GDestroyNotify          dnotify)
 658 {
 659   g_return_if_fail (GTK_IS_PRINT_BACKEND (backend));
 660
 661   GTK_PRINT_BACKEND_GET_CLASS (backend)->print_stream (backend,
 662                                                        job,
 663                                                        data_io,
 664                                                        callback,
 665                                                        user_data,
 666                                                        dnotify);
 667 }
 668
 669 void
 670 gtk_print_backend_set_password (GtkPrintBackend  *backend,
 671                                 gchar           **auth_info_required,
 672                                 gchar           **auth_info)
 673 {
 674   g_return_if_fail (GTK_IS_PRINT_BACKEND (backend));
 675
 676   if (GTK_PRINT_BACKEND_GET_CLASS (backend)->set_password)
 677     GTK_PRINT_BACKEND_GET_CLASS (backend)->set_password (backend, auth_info_required, auth_info);
 678 }
 679
 680 static void
 681 store_entry (GtkEntry  *entry,
 682              gpointer   user_data)
 683 {
 684   gchar **data = (gchar **) user_data;
 685
 686   if (*data != NULL)
 687     {
 688       memset (*data, 0, strlen (*data));
 689       g_free (*data);
 690     }
 691
 692   *data = g_strdup (gtk_entry_get_text (entry));
 693 }
 694
 695 static void
 696 password_dialog_response (GtkWidget       *dialog,
 697                           gint             response_id,
 698                           GtkPrintBackend *backend)
 699 {
 700   GtkPrintBackendPrivate *priv = backend->priv;
 701   gint i;
 702
 703   if (response_id == GTK_RESPONSE_OK)
 704     gtk_print_backend_set_password (backend, priv->auth_info_required, priv->auth_info);
 705   else
 706     gtk_print_backend_set_password (backend, priv->auth_info_required, NULL);
 707
 708   for (i = 0; i < g_strv_length (priv->auth_info_required); i++)
 709     if (priv->auth_info[i] != NULL)
 710       {
 711         memset (priv->auth_info[i], 0, strlen (priv->auth_info[i]));
 712         g_free (priv->auth_info[i]);
 713         priv->auth_info[i] = NULL;
 714       }
 715   g_free (priv->auth_info);
 716   priv->auth_info = NULL;
 717
 718   g_strfreev (priv->auth_info_required);
 719
 720   gtk_widget_destroy (dialog);
 721
 722   g_object_unref (backend);
 723 }
 724
 725 static void
 726 request_password (GtkPrintBackend  *backend,
 727                   gpointer          auth_info_required,
 728                   gpointer          auth_info_default,
 729                   gpointer          auth_info_display,
 730                   gpointer          auth_info_visible,
 731                   const gchar      *prompt)
 732 {
 733   GtkPrintBackendPrivate *priv = backend->priv;
 734   GtkWidget *dialog, *box, *main_box, *label, *icon, *vbox, *entry;
 735   GtkWidget *focus = NULL;
 736   GtkWidget *content_area;
 737   gchar     *markup;
 738   gint       length;
 739   gint       i;
 740   gchar    **ai_required = (gchar **) auth_info_required;
 741   gchar    **ai_default = (gchar **) auth_info_default;
 742   gchar    **ai_display = (gchar **) auth_info_display;
 743   gboolean  *ai_visible = (gboolean *) auth_info_visible;
 744
 745   priv->auth_info_required = g_strdupv (ai_required);
 746   length = g_strv_length (ai_required);
 747   priv->auth_info = g_new0 (gchar *, length);
 748
 749   dialog = gtk_dialog_new_with_buttons ( _("Authentication"), NULL, GTK_DIALOG_MODAL,
 750                                          GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
 751                                          GTK_STOCK_OK, GTK_RESPONSE_OK,
 752                                          NULL);
 753
 754   gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_OK);
 755   gtk_dialog_set_has_separator (GTK_DIALOG (dialog), FALSE);
 756
 757   main_box = gtk_hbox_new (FALSE, 0);
 758
 759   /* Left */
 760   icon = gtk_image_new_from_stock (GTK_STOCK_DIALOG_AUTHENTICATION, GTK_ICON_SIZE_DIALOG);
 761   gtk_misc_set_alignment (GTK_MISC (icon), 0.5, 0.0);
 762   gtk_misc_set_padding (GTK_MISC (icon), 6, 6);
 763
 764
 765   /* Right */
 766   vbox = gtk_vbox_new (FALSE, 0);
 767   gtk_widget_set_size_request (GTK_WIDGET (vbox), 320, -1);
 768
 769   /* Right - 1. */
 770   label = gtk_label_new (NULL);
 771   markup = g_markup_printf_escaped ("<span weight=\"bold\" size=\"large\">%s</span>", prompt);
 772   gtk_label_set_markup (GTK_LABEL (label), markup);
 773   gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
 774   gtk_widget_set_size_request (GTK_WIDGET (label), 320, -1);
 775   g_free (markup);
 776
 777
 778   /* Packing */
 779   content_area = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
 780   gtk_box_pack_start (GTK_BOX (content_area), main_box, TRUE, FALSE, 0);
 781
 782   gtk_box_pack_start (GTK_BOX (main_box), icon, FALSE, FALSE, 6);
 783   gtk_box_pack_start (GTK_BOX (main_box), vbox, FALSE, FALSE, 6);
 784
 785   gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, TRUE, 6);
 786
 787   /* Right - 2. */
 788   for (i = 0; i < length; i++)
 789     {
 790       priv->auth_info[i] = g_strdup (ai_default[i]);
 791       if (ai_display[i] != NULL)
 792         {
 793           box = gtk_hbox_new (TRUE, 0);
 794
 795           label = gtk_label_new (ai_display[i]);
 796           gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
 797
 798           entry = gtk_entry_new ();
 799           focus = entry;
 800
 801           if (ai_default[i] != NULL)
 802             gtk_entry_set_text (GTK_ENTRY (entry), ai_default[i]);
 803
 804           gtk_entry_set_visibility (GTK_ENTRY (entry), ai_visible[i]);
 805           gtk_entry_set_activates_default (GTK_ENTRY (entry), TRUE);
 806
 807           gtk_box_pack_start (GTK_BOX (vbox), box, FALSE, TRUE, 6);
 808
 809           gtk_box_pack_start (GTK_BOX (box), label, TRUE, TRUE, 0);
 810           gtk_box_pack_start (GTK_BOX (box), entry, TRUE, TRUE, 0);
 811
 812           g_signal_connect (entry, "changed",
 813                             G_CALLBACK (store_entry), &(priv->auth_info[i]));
 814         }
 815     }
 816
 817   if (focus != NULL)
 818     {
 819       gtk_widget_grab_focus (focus);
 820       focus = NULL;
 821     }
 822
 823   g_object_ref (backend);
 824   g_signal_connect (G_OBJECT (dialog), "response",
 825                     G_CALLBACK (password_dialog_response), backend);
 826
 827   gtk_widget_show_all (dialog);
 828 }
 829
 830 void
 831 gtk_print_backend_destroy (GtkPrintBackend *print_backend)
 832 {
 833   /* The lifecycle of print backends and printers are tied, such that
 834    * the backend owns the printers, but the printers also ref the backend.
 835    * This is so that if the app has a reference to a printer its backend
 836    * will be around. However, this results in a cycle, which we break
 837    * with this call, which causes the print backend to release its printers.
 838    */
 839   g_object_run_dispose (G_OBJECT (print_backend));
 840 }