gio/gapplication.c

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License as published
   6  * by the Free Software Foundation; either version 2 of the licence or (at
   7  * your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General
  15  * Public License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  *
  19  * Authors: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 /* Prologue {{{1 */
  23 #include "config.h"
  24
  25 #include "gapplication.h"
  26
  27 #include "gapplicationcommandline.h"
  28 #include "gapplicationimpl.h"
  29 #include "gactiongroup.h"
  30
  31 #include "gioenumtypes.h"
  32 #include "gio-marshal.h"
  33 #include "gioenums.h"
  34 #include "gfile.h"
  35
  36 #include "glibintl.h"
  37
  38 #include <string.h>
  39
  40 /**
  41  * SECTION:gapplication
  42  * @title: GApplication
  43  * @short_description: Core application class
  44  *
  45  * A #GApplication is the foundation of an application, unique for a
  46  * given application identifier.  The GApplication class wraps some
  47  * low-level platform-specific services and is intended to act as the
  48  * foundation for higher-level application classes such as
  49  * #GtkApplication or #MxApplication.  In general, you should not use
  50  * this class outside of a higher level framework.
  51  *
  52  * One of the core features that GApplication provides is process
  53  * uniqueness, in the context of a "session".  The session concept is
  54  * platform-dependent, but corresponds roughly to a graphical desktop
  55  * login.  When your application is launched again, its arguments
  56  * are passed through platform communication to the already running
  57  * program. The already running instance of the program is called the
  58  * <firstterm>primary instance</firstterm>.
  59  *
  60  * Before using GApplication, you must choose an "application identifier".
  61  * The expected form of an application identifier is very close to that of
  62  * of a <ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-interface">DBus bus name</ulink>.
  63  * Examples include: "com.example.MyApp", "org.example.internal-apps.Calculator".
  64  * For details on valid application identifiers, see
  65  * g_application_id_is_valid().
  66  *
  67  * The application identifier is claimed by the application as a
  68  * well-known bus name on the user's session bus.  This means that the
  69  * uniqueness of your application is scoped to the current session.  It
  70  * also means that your application may provide additional services
  71  * (through registration of other object paths) at that bus name.
  72  *
  73  * The registration of these object paths should be done with the shared
  74  * GDBus session bus.  Note that due to the internal architecture of
  75  * GDBus, method calls can be dispatched at any time (even if a main
  76  * loop is not running).  For this reason, you must ensure that any
  77  * object paths that you wish to register are registered before
  78  * #GApplication attempts to acquire the bus name of your application
  79  * (which happens in g_application_register()).  Unfortunately, this
  80  * means that you can not use g_application_get_is_remote() to decide if
  81  * you want to register object paths.
  82  *
  83  * GApplication provides convenient life cycle management by maintaining
  84  * a <firstterm>use count</firstterm> for the primary application instance.
  85  * The use count can be changed using g_application_hold() and
  86  * g_application_release(). If it drops to zero, the application exits.
  87  *
  88  * GApplication also implements the #GActionGroup interface and lets you
  89  * easily export actions by adding them with g_application_set_action_group().
  90  * When invoking an action by calling g_action_group_activate_action() on
  91  * the application, it is always invoked in the primary instance.
  92  *
  93  * There is a number of different entry points into a #GApplication:
  94  * <itemizedlist>
  95  * <listitem>via 'Activate' (i.e. just starting the application)</listitem>
  96  * <listitem>via 'Open' (i.e. opening some files)</listitem>
  97  * <listitem>by handling a command-line</listitem>
  98  * <listitem>via activating an action</listitem>
  99  * </itemizedlist>
 100  * The #GApplication::startup signal lets you handle the application
 101  * initialization for all of these in a single place.
 102  *
 103  * Regardless of which of these entry points is used to start the application,
 104  * GApplication passes some <firstterm id="platform-data">platform
 105  * data</firstterm> from the launching instance to the primary instance,
 106  * in the form of a #GVariant dictionary mapping strings to variants.
 107  * To use platform data, override the @before_emit or @after_emit virtual
 108  * functions in your #GApplication subclass.
 109  *
 110  * As the name indicates, the platform data may vary depending on the
 111  * operating system, but it always includes the current directory (key
 112  * "cwd"), and optionally the environment (ie the set of environment
 113  * variables and their values) of the calling process (key "environ").
 114  * The environment is only added to the platform data if the
 115  * #G_APPLICATION_SEND_ENVIONMENT flag is set. GApplication subclasses
 116  * can add their own platform data by overriding the @add_platform_data
 117  * virtual function. For instance, #GtkApplication adds startup notification
 118  * information in this way.
 119  *
 120  * <example id="gapplication-example-open"><title>Opening files with a GApplication</title>
 121  * <programlisting>
 122  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-open.c">
 123  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 124  * </xi:include>
 125  * </programlisting>
 126  * </example>
 127  *
 128  * <example id="gapplication-example-actions"><title>A GApplication with actions</title>
 129  * <programlisting>
 130  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-actions.c">
 131  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 132  * </xi:include>
 133  * </programlisting>
 134  * </example>
 135  */
 136
 137 struct _GApplicationPrivate
 138 {
 139   GApplicationFlags  flags;
 140   gchar             *id;
 141
 142   GActionGroup      *actions;
 143   GMainLoop         *mainloop;
 144
 145   guint              inactivity_timeout_id;
 146   guint              inactivity_timeout;
 147   guint              use_count;
 148
 149   guint              is_registered : 1;
 150   guint              is_remote : 1;
 151
 152   GHashTable        *remote_actions;  /* string -> RemoteActionInfo */
 153   GApplicationImpl  *impl;
 154 };
 155
 156 enum
 157 {
 158   PROP_NONE,
 159   PROP_APPLICATION_ID,
 160   PROP_FLAGS,
 161   PROP_IS_REGISTERED,
 162   PROP_IS_REMOTE,
 163   PROP_INACTIVITY_TIMEOUT,
 164   PROP_ACTION_GROUP
 165 };
 166
 167 enum
 168 {
 169   SIGNAL_STARTUP,
 170   SIGNAL_ACTIVATE,
 171   SIGNAL_OPEN,
 172   SIGNAL_ACTION,
 173   SIGNAL_COMMAND_LINE,
 174   NR_SIGNALS
 175 };
 176
 177 static guint g_application_signals[NR_SIGNALS];
 178
 179 static void g_application_action_group_iface_init (GActionGroupInterface *);
 180 G_DEFINE_TYPE_WITH_CODE (GApplication, g_application, G_TYPE_OBJECT,
 181  G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP,
 182    g_application_action_group_iface_init))
 183
 184 /* vfunc defaults {{{1 */
 185 static void
 186 g_application_real_before_emit (GApplication *application,
 187                                 GVariant     *platform_data)
 188 {
 189 }
 190
 191 static void
 192 g_application_real_after_emit (GApplication *application,
 193                                GVariant     *platform_data)
 194 {
 195 }
 196
 197 static void
 198 g_application_real_startup (GApplication *application)
 199 {
 200 }
 201
 202 static void
 203 g_application_real_activate (GApplication *application)
 204 {
 205   if (!g_signal_has_handler_pending (application,
 206                                      g_application_signals[SIGNAL_ACTIVATE],
 207                                      0, TRUE) &&
 208       G_APPLICATION_GET_CLASS (application)->activate == g_application_real_activate)
 209     {
 210       static gboolean warned;
 211
 212       if (warned)
 213         return;
 214
 215       g_warning ("Your application does not implement "
 216                  "g_application_activate() and has no handlers connected "
 217                  "to the 'activate' signal.  It should do one of these.");
 218       warned = TRUE;
 219     }
 220 }
 221
 222 static void
 223 g_application_real_open (GApplication  *application,
 224                          GFile        **files,
 225                          gint           n_files,
 226                          const gchar   *hint)
 227 {
 228   if (!g_signal_has_handler_pending (application,
 229                                      g_application_signals[SIGNAL_OPEN],
 230                                      0, TRUE) &&
 231       G_APPLICATION_GET_CLASS (application)->open == g_application_real_open)
 232     {
 233       static gboolean warned;
 234
 235       if (warned)
 236         return;
 237
 238       g_warning ("Your application claims to support opening files "
 239                  "but does not implement g_application_open() and has no "
 240                  "handlers connected to the 'open' signal.");
 241       warned = TRUE;
 242     }
 243 }
 244
 245 static int
 246 g_application_real_command_line (GApplication            *application,
 247                                  GApplicationCommandLine *cmdline)
 248 {
 249   static gboolean warned;
 250
 251   if (warned)
 252     return 1;
 253
 254   g_warning ("Your application claims to support custom command line "
 255              "handling but does not implement g_application_command_line() "
 256              "and has no handlers connected to the 'command-line' signal.");
 257
 258   warned = TRUE;
 259
 260   return 1;
 261 }
 262
 263 static gboolean
 264 g_application_real_local_command_line (GApplication   *application,
 265                                        gchar        ***arguments,
 266                                        int            *exit_status)
 267 {
 268   if (application->priv->flags & G_APPLICATION_HANDLES_COMMAND_LINE)
 269     return FALSE;
 270
 271   else
 272     {
 273       GError *error = NULL;
 274       gint n_args;
 275
 276       if (!g_application_register (application, NULL, &error))
 277         {
 278           g_critical ("%s", error->message);
 279           g_error_free (error);
 280           *exit_status = 1;
 281           return TRUE;
 282         }
 283
 284       n_args = g_strv_length (*arguments);
 285
 286       if (application->priv->flags & G_APPLICATION_IS_SERVICE)
 287         {
 288           if ((*exit_status = n_args > 1))
 289             {
 290               g_printerr ("GApplication service mode takes no arguments.\n");
 291               application->priv->flags &= ~G_APPLICATION_IS_SERVICE;
 292             }
 293
 294           return TRUE;
 295         }
 296
 297       if (n_args <= 1)
 298         {
 299           g_application_activate (application);
 300           *exit_status = 0;
 301         }
 302
 303       else
 304         {
 305           if (~application->priv->flags & G_APPLICATION_HANDLES_OPEN)
 306             {
 307               g_critical ("This application can not open files.");
 308               *exit_status = 1;
 309             }
 310           else
 311             {
 312               GFile **files;
 313               gint n_files;
 314               gint i;
 315
 316               n_files = n_args - 1;
 317               files = g_new (GFile *, n_files);
 318
 319               for (i = 0; i < n_files; i++)
 320                 files[i] = g_file_new_for_commandline_arg ((*arguments)[i + 1]);
 321
 322               g_application_open (application, files, n_files, "");
 323
 324               for (i = 0; i < n_files; i++)
 325                 g_object_unref (files[i]);
 326               g_free (files);
 327
 328               *exit_status = 0;
 329             }
 330         }
 331
 332       return TRUE;
 333     }
 334 }
 335
 336 static void
 337 g_application_real_add_platform_data (GApplication    *application,
 338                                       GVariantBuilder *builder)
 339 {
 340 }
 341
 342 static void
 343 g_application_real_quit_mainloop (GApplication *application)
 344 {
 345   if (application->priv->mainloop != NULL)
 346     g_main_loop_quit (application->priv->mainloop);
 347 }
 348
 349 static void
 350 g_application_real_run_mainloop (GApplication *application)
 351 {
 352   if (application->priv->mainloop == NULL)
 353     application->priv->mainloop = g_main_loop_new (NULL, FALSE);
 354
 355   g_main_loop_run (application->priv->mainloop);
 356 }
 357
 358 /* GObject implementation stuff {{{1 */
 359 static void
 360 g_application_set_property (GObject      *object,
 361                             guint         prop_id,
 362                             const GValue *value,
 363                             GParamSpec   *pspec)
 364 {
 365   GApplication *application = G_APPLICATION (object);
 366
 367   switch (prop_id)
 368     {
 369     case PROP_APPLICATION_ID:
 370       g_application_set_application_id (application,
 371                                         g_value_get_string (value));
 372       break;
 373
 374     case PROP_FLAGS:
 375       g_application_set_flags (application, g_value_get_flags (value));
 376       break;
 377
 378     case PROP_INACTIVITY_TIMEOUT:
 379       g_application_set_inactivity_timeout (application,
 380                                             g_value_get_uint (value));
 381       break;
 382
 383     case PROP_ACTION_GROUP:
 384       g_application_set_action_group (application,
 385                                       g_value_get_object (value));
 386       break;
 387
 388     default:
 389       g_assert_not_reached ();
 390     }
 391 }
 392
 393 /**
 394  * g_application_set_action_group:
 395  * @application: a #GApplication
 396  * @action_group: (allow-none): a #GActionGroup, or %NULL
 397  *
 398  * Sets or unsets the group of actions associated with the application.
 399  *
 400  * These actions are the actions that can be remotely invoked.
 401  *
 402  * It is an error to call this function after the application has been
 403  * registered.
 404  *
 405  * Since: 2.28
 406  **/
 407 void
 408 g_application_set_action_group (GApplication *application,
 409                                 GActionGroup *action_group)
 410 {
 411   g_return_if_fail (G_IS_APPLICATION (application));
 412   g_return_if_fail (!application->priv->is_registered);
 413
 414   if (application->priv->actions != NULL)
 415     g_object_unref (application->priv->actions);
 416
 417   application->priv->actions = action_group;
 418
 419   if (application->priv->actions != NULL)
 420     g_object_ref (application->priv->actions);
 421 }
 422
 423 static void
 424 g_application_get_property (GObject    *object,
 425                             guint       prop_id,
 426                             GValue     *value,
 427                             GParamSpec *pspec)
 428 {
 429   GApplication *application = G_APPLICATION (object);
 430
 431   switch (prop_id)
 432     {
 433     case PROP_APPLICATION_ID:
 434       g_value_set_string (value,
 435                           g_application_get_application_id (application));
 436       break;
 437
 438     case PROP_FLAGS:
 439       g_value_set_flags (value,
 440                          g_application_get_flags (application));
 441       break;
 442
 443     case PROP_IS_REGISTERED:
 444       g_value_set_boolean (value,
 445                            g_application_get_is_registered (application));
 446       break;
 447
 448     case PROP_IS_REMOTE:
 449       g_value_set_boolean (value,
 450                            g_application_get_is_remote (application));
 451       break;
 452
 453     case PROP_INACTIVITY_TIMEOUT:
 454       g_value_set_uint (value,
 455                         g_application_get_inactivity_timeout (application));
 456       break;
 457
 458     default:
 459       g_assert_not_reached ();
 460     }
 461 }
 462
 463 static void
 464 g_application_constructed (GObject *object)
 465 {
 466   GApplication *application = G_APPLICATION (object);
 467
 468   g_assert (application->priv->id != NULL);
 469 }
 470
 471 static void
 472 g_application_finalize (GObject *object)
 473 {
 474   GApplication *application = G_APPLICATION (object);
 475
 476   if (application->priv->impl)
 477     g_application_impl_destroy (application->priv->impl);
 478   g_free (application->priv->id);
 479
 480   if (application->priv->mainloop)
 481     g_main_loop_unref (application->priv->mainloop);
 482
 483   G_OBJECT_CLASS (g_application_parent_class)
 484     ->finalize (object);
 485 }
 486
 487 static void
 488 g_application_init (GApplication *application)
 489 {
 490   application->priv = G_TYPE_INSTANCE_GET_PRIVATE (application,
 491                                                    G_TYPE_APPLICATION,
 492                                                    GApplicationPrivate);
 493 }
 494
 495 static void
 496 g_application_class_init (GApplicationClass *class)
 497 {
 498   GObjectClass *object_class = G_OBJECT_CLASS (class);
 499
 500   object_class->constructed = g_application_constructed;
 501   object_class->finalize = g_application_finalize;
 502   object_class->get_property = g_application_get_property;
 503   object_class->set_property = g_application_set_property;
 504
 505   class->before_emit = g_application_real_before_emit;
 506   class->after_emit = g_application_real_after_emit;
 507   class->startup = g_application_real_startup;
 508   class->activate = g_application_real_activate;
 509   class->open = g_application_real_open;
 510   class->command_line = g_application_real_command_line;
 511   class->local_command_line = g_application_real_local_command_line;
 512   class->add_platform_data = g_application_real_add_platform_data;
 513   class->quit_mainloop = g_application_real_quit_mainloop;
 514   class->run_mainloop = g_application_real_run_mainloop;
 515
 516   g_object_class_install_property (object_class, PROP_APPLICATION_ID,
 517     g_param_spec_string ("application-id",
 518                          P_("Application identifier"),
 519                          P_("The unique identifier for the application"),
 520                          NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
 521                          G_PARAM_STATIC_STRINGS));
 522
 523   g_object_class_install_property (object_class, PROP_FLAGS,
 524     g_param_spec_flags ("flags",
 525                         P_("Application flags"),
 526                         P_("Flags specifying the behaviour of the application"),
 527                         G_TYPE_APPLICATION_FLAGS, G_APPLICATION_FLAGS_NONE,
 528                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 529
 530   g_object_class_install_property (object_class, PROP_IS_REGISTERED,
 531     g_param_spec_boolean ("is-registered",
 532                           P_("Is registered"),
 533                           P_("If g_application_register() has been called"),
 534                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 535
 536   g_object_class_install_property (object_class, PROP_IS_REMOTE,
 537     g_param_spec_boolean ("is-remote",
 538                           P_("Is remote"),
 539                           P_("If this application instance is remote"),
 540                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 541
 542   g_object_class_install_property (object_class, PROP_INACTIVITY_TIMEOUT,
 543     g_param_spec_uint ("inactivity-timeout",
 544                        P_("Inactivity timeout"),
 545                        P_("Iime (ms) to stay alive after becoming idle"),
 546                        0, G_MAXUINT, 0,
 547                        G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 548
 549   g_object_class_install_property (object_class, PROP_ACTION_GROUP,
 550     g_param_spec_object ("action-group",
 551                          P_("Action group"),
 552                          P_("The group of actions that the application exports"),
 553                          G_TYPE_ACTION_GROUP,
 554                          G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
 555
 556   /**
 557    * GApplication::startup:
 558    * @application: the application
 559    *
 560    * The ::startup signal is emitted on the primary instance immediately
 561    * after registration. See g_application_register().
 562    */
 563   g_application_signals[SIGNAL_STARTUP] =
 564     g_signal_new ("startup", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 565                   G_STRUCT_OFFSET (GApplicationClass, startup),
 566                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 567
 568   /**
 569    * GApplication::activate:
 570    * @application: the application
 571    *
 572    * The ::activate signal is emitted on the primary instance when an
 573    * activation occurs. See g_application_activate().
 574    */
 575   g_application_signals[SIGNAL_ACTIVATE] =
 576     g_signal_new ("activate", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 577                   G_STRUCT_OFFSET (GApplicationClass, activate),
 578                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 579
 580
 581   /**
 582    * GApplication::open:
 583    * @application: the application
 584    * @files: (array length=n_files) (element-type GFile): an array of #GFiles
 585    * @n_files: the length of @files
 586    * @hint: a hint provided by the calling instance
 587    *
 588    * The ::open signal is emitted on the primary instance when there are
 589    * files to open. See g_application_open() for more information.
 590    */
 591   g_application_signals[SIGNAL_OPEN] =
 592     g_signal_new ("open", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 593                   G_STRUCT_OFFSET (GApplicationClass, open),
 594                   NULL, NULL, _gio_marshal_VOID__POINTER_INT_STRING,
 595                   G_TYPE_NONE, 3, G_TYPE_POINTER, G_TYPE_INT, G_TYPE_STRING);
 596
 597   /**
 598    * GApplication::command-line:
 599    * @application: the application
 600    * @command_line: a #GApplicationCommandLine representing the
 601    *     passed commandline
 602    *
 603    * The ::command-line signal is emitted on the primary instance when
 604    * a commandline is not handled locally. See g_application_run() and
 605    * the #GApplicationCommandline documentation for more information.
 606    *
 607    * Returns: An integer that is set as the exit status for the calling
 608    *   process. See g_application_command_line_set_exit_status().
 609    */
 610   g_application_signals[SIGNAL_COMMAND_LINE] =
 611     g_signal_new ("command-line", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 612                   G_STRUCT_OFFSET (GApplicationClass, command_line),
 613                   g_signal_accumulator_first_wins, NULL,
 614                   _gio_marshal_INT__OBJECT,
 615                   G_TYPE_INT, 1, G_TYPE_APPLICATION_COMMAND_LINE);
 616
 617   g_type_class_add_private (class, sizeof (GApplicationPrivate));
 618 }
 619
 620 static GVariant *
 621 get_platform_data (GApplication *application)
 622 {
 623   GVariantBuilder *builder;
 624   GVariant *result;
 625
 626   builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));
 627
 628   {
 629     gchar *cwd = g_get_current_dir ();
 630     g_variant_builder_add (builder, "{sv}", "cwd",
 631                            g_variant_new_bytestring (cwd));
 632     g_free (cwd);
 633   }
 634
 635   if (application->priv->flags & G_APPLICATION_SEND_ENVIRONMENT)
 636     {
 637       GVariant *array;
 638       gchar **envp;
 639
 640       envp = g_get_environ ();
 641       array = g_variant_new_bytestring_array ((const gchar **) envp, -1);
 642       g_strfreev (envp);
 643
 644       g_variant_builder_add (builder, "{sv}", "environ", array);
 645     }
 646
 647   G_APPLICATION_GET_CLASS (application)->
 648     add_platform_data (application, builder);
 649
 650   result = g_variant_builder_end (builder);
 651   g_variant_builder_unref (builder);
 652
 653   return result;
 654 }
 655
 656 /* Application ID validity {{{1 */
 657
 658 /**
 659  * g_application_id_is_valid:
 660  * @application_id: a potential application identifier
 661  * @returns: %TRUE if @application_id is valid
 662  *
 663  * Checks if @application_id is a valid application identifier.
 664  *
 665  * A valid ID is required for calls to g_application_new() and
 666  * g_application_set_application_id().
 667  *
 668  * For convenience, the restrictions on application identifiers are
 669  * reproduced here:
 670  * <itemizedlist>
 671  *   <listitem>Application identifiers must contain only the ASCII characters "[A-Z][a-z][0-9]_-." and must not begin with a digit.</listitem>
 672  *   <listitem>Application identifiers must contain at least one '.' (period) character (and thus at least three elements).</listitem>
 673  *   <listitem>Application identifiers must not begin or end with a '.' (period) character.</listitem>
 674  *   <listitem>Application identifiers must not contain consecutive '.' (period) characters.</listitem>
 675  *   <listitem>Application identifiers must not exceed 255 characters.</listitem>
 676  * </itemizedlist>
 677  **/
 678 gboolean
 679 g_application_id_is_valid (const gchar *application_id)
 680 {
 681   gsize len;
 682   gboolean allow_dot;
 683   gboolean has_dot;
 684
 685   len = strlen (application_id);
 686
 687   if (len > 255)
 688     return FALSE;
 689
 690   if (!g_ascii_isalpha (application_id[0]))
 691     return FALSE;
 692
 693   if (application_id[len-1] == '.')
 694     return FALSE;
 695
 696   application_id++;
 697   allow_dot = TRUE;
 698   has_dot = FALSE;
 699   for (; *application_id; application_id++)
 700     {
 701       if (g_ascii_isalnum (*application_id) ||
 702           (*application_id == '-') ||
 703           (*application_id == '_'))
 704         {
 705           allow_dot = TRUE;
 706         }
 707       else if (allow_dot && *application_id == '.')
 708         {
 709           has_dot = TRUE;
 710           allow_dot = FALSE;
 711         }
 712       else
 713         return FALSE;
 714     }
 715
 716   if (!has_dot)
 717     return FALSE;
 718
 719   return TRUE;
 720 }
 721
 722 /* Public Constructor {{{1 */
 723 /**
 724  * g_application_new:
 725  * @application_id: the application id
 726  * @flags: the application flags
 727  * @returns: a new #GApplication instance
 728  *
 729  * Creates a new #GApplication instance.
 730  *
 731  * This function calls g_type_init() for you.
 732  *
 733  * The application id must be valid.  See g_application_id_is_valid().
 734  **/
 735 GApplication *
 736 g_application_new (const gchar       *application_id,
 737                    GApplicationFlags  flags)
 738 {
 739   g_return_val_if_fail (g_application_id_is_valid (application_id), NULL);
 740
 741   g_type_init ();
 742
 743   return g_object_new (G_TYPE_APPLICATION,
 744                        "application-id", application_id,
 745                        "flags", flags,
 746                        NULL);
 747 }
 748
 749 /* Simple get/set: application id, flags, inactivity timeout {{{1 */
 750 /**
 751  * g_application_get_application_id:
 752  * @application: a #GApplication
 753  * @returns: the identifier for @application, owned by @application
 754  *
 755  * Gets the unique identifier for @application.
 756  *
 757  * Since: 2.28
 758  **/
 759 const gchar *
 760 g_application_get_application_id (GApplication *application)
 761 {
 762   g_return_val_if_fail (G_IS_APPLICATION (application), NULL);
 763
 764   return application->priv->id;
 765 }
 766
 767 /**
 768  * g_application_set_application_id:
 769  * @application: a #GApplication
 770  * @application_id: the identifier for @application
 771  *
 772  * Sets the unique identifier for @application.
 773  *
 774  * The application id can only be modified if @application has not yet
 775  * been registered.
 776  *
 777  * The application id must be valid.  See g_application_id_is_valid().
 778  *
 779  * Since: 2.28
 780  **/
 781 void
 782 g_application_set_application_id (GApplication *application,
 783                                   const gchar  *application_id)
 784 {
 785   g_return_if_fail (G_IS_APPLICATION (application));
 786
 787   if (g_strcmp0 (application->priv->id, application_id) != 0)
 788     {
 789       g_return_if_fail (g_application_id_is_valid (application_id));
 790       g_return_if_fail (!application->priv->is_registered);
 791
 792       g_free (application->priv->id);
 793       application->priv->id = g_strdup (application_id);
 794
 795       g_object_notify (G_OBJECT (application), "application-id");
 796     }
 797 }
 798
 799 /**
 800  * g_application_get_flags:
 801  * @application: a #GApplication
 802  * @returns: the flags for @application
 803  *
 804  * Gets the flags for @application.
 805  *
 806  * See #GApplicationFlags.
 807  *
 808  * Since: 2.28
 809  **/
 810 GApplicationFlags
 811 g_application_get_flags (GApplication *application)
 812 {
 813   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
 814
 815   return application->priv->flags;
 816 }
 817
 818 /**
 819  * g_application_set_flags:
 820  * @application: a #GApplication
 821  * @flags: the flags for @application
 822  *
 823  * Sets the flags for @application.
 824  *
 825  * The flags can only be modified if @application has not yet been
 826  * registered.
 827  *
 828  * See #GApplicationFlags.
 829  *
 830  * Since: 2.28
 831  **/
 832 void
 833 g_application_set_flags (GApplication      *application,
 834                          GApplicationFlags  flags)
 835 {
 836   g_return_if_fail (G_IS_APPLICATION (application));
 837
 838   if (application->priv->flags != flags)
 839     {
 840       g_return_if_fail (!application->priv->is_registered);
 841
 842       application->priv->flags = flags;
 843
 844       g_object_notify (G_OBJECT (application), "flags");
 845     }
 846 }
 847
 848 /**
 849  * g_application_get_inactivity_timeout:
 850  * @application: a #GApplication
 851  *
 852  * Gets the current inactivity timeout for the application.
 853  *
 854  * This is the amount of time (in milliseconds) after the last call to
 855  * g_application_release() before the application stops running.
 856  *
 857  * Returns: the timeout, in milliseconds
 858  *
 859  * Since: 2.28
 860  **/
 861 guint
 862 g_application_get_inactivity_timeout (GApplication *application)
 863 {
 864   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
 865
 866   return application->priv->inactivity_timeout;
 867 }
 868
 869 /**
 870  * g_application_set_inactivity_timeout:
 871  * @application: a #GApplication
 872  * @inactivity_timeout: the timeout, in milliseconds
 873  *
 874  * Sets the current inactivity timeout for the application.
 875  *
 876  * This is the amount of time (in milliseconds) after the last call to
 877  * g_application_release() before the application stops running.
 878  *
 879  * This call has no side effects of its own.  The value set here is only
 880  * used for next time g_application_release() drops the use count to
 881  * zero.  Any timeouts currently in progress are not impacted.
 882  *
 883  * Returns: the timeout, in milliseconds
 884  *
 885  * Since: 2.28
 886  **/
 887 void
 888 g_application_set_inactivity_timeout (GApplication *application,
 889                                       guint         inactivity_timeout)
 890 {
 891   g_return_if_fail (G_IS_APPLICATION (application));
 892
 893   if (application->priv->inactivity_timeout != inactivity_timeout)
 894     {
 895       application->priv->inactivity_timeout = inactivity_timeout;
 896
 897       g_object_notify (G_OBJECT (application), "inactivity-timeout");
 898     }
 899 }
 900 /* Read-only property getters (is registered, is remote) {{{1 */
 901 /**
 902  * g_application_get_is_registered:
 903  * @application: a #GApplication
 904  * @returns: %TRUE if @application is registered
 905  *
 906  * Checks if @application is registered.
 907  *
 908  * An application is registered if g_application_register() has been
 909  * successfully called.
 910  *
 911  * Since: 2.28
 912  **/
 913 gboolean
 914 g_application_get_is_registered (GApplication *application)
 915 {
 916   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 917
 918   return application->priv->is_registered;
 919 }
 920
 921 /**
 922  * g_application_get_is_remote:
 923  * @application: a #GApplication
 924  * @returns: %TRUE if @application is remote
 925  *
 926  * Checks if @application is remote.
 927  *
 928  * If @application is remote then it means that another instance of
 929  * application already exists (the 'primary' instance).  Calls to
 930  * perform actions on @application will result in the actions being
 931  * performed by the primary instance.
 932  *
 933  * The value of this property can not be accessed before
 934  * g_application_register() has been called.  See
 935  * g_application_get_is_registered().
 936  *
 937  * Since: 2.28
 938  **/
 939 gboolean
 940 g_application_get_is_remote (GApplication *application)
 941 {
 942   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 943   g_return_val_if_fail (application->priv->is_registered, FALSE);
 944
 945   return application->priv->is_remote;
 946 }
 947
 948 /* Register {{{1 */
 949 /**
 950  * g_application_register:
 951  * @application: a #GApplication
 952  * @cancellable: a #GCancellable, or %NULL
 953  * @error: a pointer to a NULL #GError, or %NULL
 954  * @returns: %TRUE if registration succeeded
 955  *
 956  * Attempts registration of the application.
 957  *
 958  * This is the point at which the application discovers if it is the
 959  * primary instance or merely acting as a remote for an already-existing
 960  * primary instance.  This is implemented by attempting to acquire the
 961  * application identifier as a unique bus name on the session bus using
 962  * GDBus.
 963  *
 964  * Due to the internal architecture of GDBus, method calls can be
 965  * dispatched at any time (even if a main loop is not running).  For
 966  * this reason, you must ensure that any object paths that you wish to
 967  * register are registered before calling this function.
 968  *
 969  * If the application has already been registered then %TRUE is
 970  * returned with no work performed.
 971  *
 972  * The #GApplication::startup signal is emitted if registration succeeds
 973  * and @application is the primary instance.
 974  *
 975  * In the event of an error (such as @cancellable being cancelled, or a
 976  * failure to connect to the session bus), %FALSE is returned and @error
 977  * is set appropriately.
 978  *
 979  * Note: the return value of this function is not an indicator that this
 980  * instance is or is not the primary instance of the application.  See
 981  * g_application_get_is_remote() for that.
 982  *
 983  * Since: 2.28
 984  **/
 985 gboolean
 986 g_application_register (GApplication  *application,
 987                         GCancellable  *cancellable,
 988                         GError       **error)
 989 {
 990   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 991
 992   if (!application->priv->is_registered)
 993     {
 994       application->priv->impl =
 995         g_application_impl_register (application, application->priv->id,
 996                                      application->priv->flags,
 997                                      &application->priv->remote_actions,
 998                                      cancellable, error);
 999
1000       if (application->priv->impl == NULL)
1001         return FALSE;
1002
1003       application->priv->is_remote = application->priv->remote_actions != NULL;
1004       application->priv->is_registered = TRUE;
1005
1006       g_object_notify (G_OBJECT (application), "is-registered");
1007
1008       if (!application->priv->is_remote)
1009         g_signal_emit (application, g_application_signals[SIGNAL_STARTUP], 0);
1010     }
1011
1012   return TRUE;
1013 }
1014
1015 /* Hold/release {{{1 */
1016 /**
1017  * g_application_hold:
1018  * @application: a #GApplication
1019  *
1020  * Increases the use count of @application.
1021  *
1022  * Use this function to indicate that the application has a reason to
1023  * continue to run.  For example, g_application_hold() is called by GTK+
1024  * when a toplevel window is on the screen.
1025  *
1026  * To cancel the hold, call g_application_release().
1027  **/
1028 void
1029 g_application_hold (GApplication *application)
1030 {
1031   if (application->priv->inactivity_timeout_id)
1032     {
1033       g_source_remove (application->priv->inactivity_timeout_id);
1034       application->priv->inactivity_timeout_id = 0;
1035     }
1036
1037   application->priv->use_count++;
1038 }
1039
1040 static gboolean
1041 inactivity_timeout_expired (gpointer data)
1042 {
1043   GApplication *application = G_APPLICATION (data);
1044
1045   G_APPLICATION_GET_CLASS (application)
1046     ->quit_mainloop (application);
1047
1048   return FALSE;
1049 }
1050
1051
1052 /**
1053  * g_application_release:
1054  * @application: a #GApplication
1055  *
1056  * Decrease the use count of @application.
1057  *
1058  * When the use count reaches zero, the application will stop running.
1059  *
1060  * Never call this function except to cancel the effect of a previous
1061  * call to g_application_hold().
1062  **/
1063 void
1064 g_application_release (GApplication *application)
1065 {
1066   application->priv->use_count--;
1067
1068   if (application->priv->use_count == 0)
1069     {
1070       if (application->priv->inactivity_timeout)
1071         application->priv->inactivity_timeout_id =
1072           g_timeout_add (application->priv->inactivity_timeout,
1073                          inactivity_timeout_expired, application);
1074
1075       else
1076         G_APPLICATION_GET_CLASS (application)
1077           ->quit_mainloop (application);
1078     }
1079 }
1080
1081 /* Activate, Open {{{1 */
1082 /**
1083  * g_application_activate:
1084  * @application: a #GApplication
1085  *
1086  * Activates the application.
1087  *
1088  * In essence, this results in the #GApplication::activate() signal being
1089  * emitted in the primary instance.
1090  *
1091  * The application must be registered before calling this function.
1092  *
1093  * Since: 2.28
1094  **/
1095 void
1096 g_application_activate (GApplication *application)
1097 {
1098   g_return_if_fail (G_IS_APPLICATION (application));
1099   g_return_if_fail (application->priv->is_registered);
1100
1101   if (application->priv->is_remote)
1102     g_application_impl_activate (application->priv->impl,
1103                                  get_platform_data (application));
1104
1105   else
1106     g_signal_emit (application, g_application_signals[SIGNAL_ACTIVATE], 0);
1107 }
1108
1109 /**
1110  * g_application_open:
1111  * @application: a #GApplication
1112  * @files: (array length=n_files): an array of #GFiles to open
1113  * @n_files: the length of the @files array
1114  * @hint: a hint (or ""), but never %NULL
1115  *
1116  * Opens the given files.
1117  *
1118  * In essence, this results in the #GApplication::open signal being emitted
1119  * in the primary instance.
1120  *
1121  * @n_files must be greater than zero.
1122  *
1123  * @hint is simply passed through to the ::open signal.  It is
1124  * intended to be used by applications that have multiple modes for
1125  * opening files (eg: "view" vs "edit", etc).  Unless you have a need
1126  * for this functionality, you should use "".
1127  *
1128  * The application must be registered before calling this function
1129  * and it must have the %G_APPLICATION_HANDLES_OPEN flag set.
1130  *
1131  * Since: 2.28
1132  **/
1133 void
1134 g_application_open (GApplication  *application,
1135                     GFile        **files,
1136                     gint           n_files,
1137                     const gchar   *hint)
1138 {
1139   g_return_if_fail (G_IS_APPLICATION (application));
1140   g_return_if_fail (application->priv->flags &
1141                     G_APPLICATION_HANDLES_OPEN);
1142   g_return_if_fail (application->priv->is_registered);
1143
1144   if (application->priv->is_remote)
1145     g_application_impl_open (application->priv->impl,
1146                              files, n_files, hint,
1147                              get_platform_data (application));
1148
1149   else
1150     g_signal_emit (application, g_application_signals[SIGNAL_OPEN],
1151                    0, files, n_files, hint);
1152 }
1153
1154 /* Run {{{1 */
1155 /**
1156  * g_application_run:
1157  * @application: a #GApplication
1158  * @argc: the argc from main() (or 0 if @argv is %NULL)
1159  * @argv: (array length=argc): the argv from main(), or %NULL
1160  * @returns: the exit status
1161  *
1162  * Runs the application.
1163  *
1164  * This function is intended to be run from main() and its return value
1165  * is intended to be returned by main(). Although you are expected to pass
1166  * the @argc, @argv parameters from main() to this function, it is possible
1167  * to pass %NULL if @argv is not available or commandline handling is not
1168  * required.
1169  *
1170  * First, the local_command_line() virtual function is invoked.
1171  * This function always runs on the local instance. It gets passed
1172  * a pointer to a copy of @argv and is expected to remove the arguments
1173  * that it handled (shifting up remaining arguments). See
1174  * <xref linkend="gapplication-example-cmdline2"/> for an example.
1175  * The last argument to local_command_line() is a pointer to the @status
1176  * variable which can used to set the exit status that is returned from
1177  * g_application_run().
1178  *
1179  * If local_command_line() returns %TRUE, the command line is expected
1180  * to be completely handled, including possibly registering as the primary
1181  * instance, calling g_application_activate() or g_application_open(), etc.
1182  *
1183  * If local_command_line() returns %FALSE then the application is registered
1184  * and the #GApplication::command-line signal is emitted in the primary
1185  * instance (which may or may not be this instance).
1186  *
1187  * If the application has the %G_APPLICATION_HANDLES_COMMAND_LINE
1188  * flag set then the default implementation of local_command_line()
1189  * always returns %FALSE immediately, resulting in the commandline
1190  * always being handled in the primary instance.
1191  *
1192  * Otherwise, the default implementation of local_command_line() tries
1193  * to do a couple of things that are probably reasonable for most
1194  * applications.  First, g_application_register() is called to attempt
1195  * to register the application.  If that works, then the command line
1196  * arguments are inspected.  If no commandline arguments are given, then
1197  * g_application_activate() is called.  If commandline arguments are
1198  * given and the %G_APPLICATION_HANDLES_OPEN flag is set then they
1199  * are assumed to be filenames and g_application_open() is called.
1200  *
1201  * If you are interested in doing more complicated local handling of the
1202  * commandline then you should implement your own #GApplication subclass
1203  * and override local_command_line(). In this case, you most likely want
1204  * to return %TRUE from your local_command_line() implementation to
1205  * suppress the default handling. See
1206  * <xref linkend="gapplication-example-cmdline2"/> for an example.
1207  *
1208  * If, after the above is done, the use count of the application is zero
1209  * then the exit status is returned immediately.  If the use count is
1210  * non-zero then the mainloop is run until the use count falls to zero,
1211  * at which point 0 is returned.
1212  *
1213  * If the %G_APPLICATION_IS_SERVICE flag is set, then the exiting at
1214  * use count of zero is delayed for a while (ie: the instance stays
1215  * around to provide its <emphasis>service</emphasis> to others).
1216  *
1217  * Since: 2.28
1218  **/
1219 int
1220 g_application_run (GApplication  *application,
1221                    int            argc,
1222                    char         **argv)
1223 {
1224   gchar **arguments;
1225   int status;
1226   gint i;
1227
1228   g_return_val_if_fail (G_IS_APPLICATION (application), 1);
1229   g_return_val_if_fail (argc == 0 || argv != NULL, 1);
1230
1231   arguments = g_new (gchar *, argc + 1);
1232   for (i = 0; i < argc; i++)
1233     arguments[i] = g_strdup (argv[i]);
1234   arguments[i] = NULL;
1235
1236   if (g_get_prgname () == NULL && argc > 0)
1237     {
1238       gchar *prgname;
1239
1240       prgname = g_path_get_basename (argv[0]);
1241       g_set_prgname (prgname);
1242       g_free (prgname);
1243     }
1244
1245   if (!G_APPLICATION_GET_CLASS (application)
1246         ->local_command_line (application, &arguments, &status))
1247     {
1248       GError *error = NULL;
1249
1250       if (!g_application_register (application, NULL, &error))
1251         {
1252           g_printerr ("%s", error->message);
1253           g_error_free (error);
1254           return 1;
1255         }
1256
1257       if (application->priv->is_remote)
1258         {
1259           GVariant *platform_data;
1260
1261           platform_data = get_platform_data (application);
1262           status = g_application_impl_command_line (application->priv->impl,
1263                                                     arguments, platform_data);
1264         }
1265       else
1266         {
1267           GApplicationCommandLine *cmdline;
1268           GVariant *v;
1269
1270           v = g_variant_new_bytestring_array ((const gchar **) arguments, -1);
1271           cmdline = g_object_new (G_TYPE_APPLICATION_COMMAND_LINE,
1272                                   "arguments", v, NULL);
1273           g_signal_emit (application,
1274                          g_application_signals[SIGNAL_COMMAND_LINE],
1275                          0, cmdline, &status);
1276           g_object_unref (cmdline);
1277         }
1278     }
1279
1280   g_strfreev (arguments);
1281
1282   if (application->priv->flags & G_APPLICATION_IS_SERVICE &&
1283       application->priv->is_registered &&
1284       !application->priv->use_count &&
1285       !application->priv->inactivity_timeout_id)
1286     {
1287       application->priv->inactivity_timeout_id =
1288         g_timeout_add (10000, inactivity_timeout_expired, application);
1289     }
1290
1291   if (application->priv->use_count ||
1292       application->priv->inactivity_timeout_id)
1293     {
1294       G_APPLICATION_GET_CLASS (application)
1295         ->run_mainloop (application);
1296       status = 0;
1297     }
1298
1299   if (application->priv->impl)
1300     g_application_impl_flush (application->priv->impl);
1301
1302   return status;
1303 }
1304
1305 static gboolean
1306 g_application_has_action (GActionGroup *action_group,
1307                           const gchar  *action_name)
1308 {
1309   GApplication *application = G_APPLICATION (action_group);
1310
1311   g_return_val_if_fail (application->priv->is_registered, FALSE);
1312
1313   if (application->priv->remote_actions != NULL)
1314     return g_hash_table_lookup (application->priv->remote_actions,
1315                                 action_name) != NULL;
1316
1317   return application->priv->actions &&
1318          g_action_group_has_action (application->priv->actions, action_name);
1319 }
1320
1321 static gchar **
1322 g_application_list_actions (GActionGroup *action_group)
1323 {
1324   GApplication *application = G_APPLICATION (action_group);
1325
1326   g_return_val_if_fail (application->priv->is_registered, NULL);
1327
1328   if (application->priv->remote_actions != NULL)
1329     {
1330       GHashTableIter iter;
1331       gint n, i = 0;
1332       gchar **keys;
1333       gpointer key;
1334
1335       n = g_hash_table_size (application->priv->remote_actions);
1336       keys = g_new (gchar *, n + 1);
1337
1338       g_hash_table_iter_init (&iter, application->priv->remote_actions);
1339       while (g_hash_table_iter_next (&iter, &key, NULL))
1340         keys[i++] = g_strdup (key);
1341       g_assert_cmpint (i, ==, n);
1342       keys[n] = NULL;
1343
1344       return keys;
1345     }
1346
1347   else if (application->priv->actions != NULL)
1348     return g_action_group_list_actions (application->priv->actions);
1349
1350   else
1351     /* empty string array */
1352     return g_new0 (gchar *, 1);
1353 }
1354
1355 static gboolean
1356 g_application_get_action_enabled (GActionGroup *action_group,
1357                                   const gchar  *action_name)
1358 {
1359   GApplication *application = G_APPLICATION (action_group);
1360
1361   g_return_val_if_fail (application->priv->actions != NULL, FALSE);
1362   g_return_val_if_fail (application->priv->is_registered, FALSE);
1363
1364   if (application->priv->remote_actions)
1365     {
1366       RemoteActionInfo *info;
1367
1368       info = g_hash_table_lookup (application->priv->remote_actions,
1369                                   action_name);
1370
1371       return info && info->enabled;
1372     }
1373
1374   return g_action_group_get_action_enabled (application->priv->actions,
1375                                             action_name);
1376 }
1377
1378 static const GVariantType *
1379 g_application_get_action_parameter_type (GActionGroup *action_group,
1380                                          const gchar  *action_name)
1381 {
1382   GApplication *application = G_APPLICATION (action_group);
1383
1384   g_return_val_if_fail (application->priv->actions != NULL, NULL);
1385   g_return_val_if_fail (application->priv->is_registered, NULL);
1386
1387   if (application->priv->remote_actions)
1388     {
1389       RemoteActionInfo *info;
1390
1391       info = g_hash_table_lookup (application->priv->remote_actions,
1392                                   action_name);
1393
1394       if (info)
1395         return info->parameter_type;
1396       else
1397         return NULL;
1398     }
1399
1400   return g_action_group_get_action_parameter_type (application->priv->actions,
1401                                                    action_name);
1402 }
1403
1404 static const GVariantType *
1405 g_application_get_action_state_type (GActionGroup *action_group,
1406                                      const gchar  *action_name)
1407 {
1408   GApplication *application = G_APPLICATION (action_group);
1409
1410   g_return_val_if_fail (application->priv->actions != NULL, NULL);
1411   g_return_val_if_fail (application->priv->is_registered, NULL);
1412
1413   if (application->priv->remote_actions)
1414     {
1415       RemoteActionInfo *info;
1416
1417       info = g_hash_table_lookup (application->priv->remote_actions,
1418                                   action_name);
1419
1420       if (info && info->state)
1421         return g_variant_get_type (info->state);
1422       else
1423         return NULL;
1424     }
1425
1426   return g_action_group_get_action_state_type (application->priv->actions,
1427                                                action_name);
1428 }
1429
1430 static GVariant *
1431 g_application_get_action_state (GActionGroup *action_group,
1432                                 const gchar  *action_name)
1433 {
1434   GApplication *application = G_APPLICATION (action_group);
1435
1436   g_return_val_if_fail (application->priv->actions != NULL, NULL);
1437   g_return_val_if_fail (application->priv->is_registered, NULL);
1438
1439   if (application->priv->remote_actions)
1440     {
1441       RemoteActionInfo *info;
1442
1443       info = g_hash_table_lookup (application->priv->remote_actions,
1444                                   action_name);
1445
1446       if (info && info->state)
1447         return g_variant_ref (info->state);
1448       else
1449         return NULL;
1450     }
1451
1452   return g_action_group_get_action_state (application->priv->actions,
1453                                           action_name);
1454 }
1455
1456 static void
1457 g_application_change_action_state (GActionGroup *action_group,
1458                                    const gchar  *action_name,
1459                                    GVariant     *value)
1460 {
1461   GApplication *application = G_APPLICATION (action_group);
1462
1463   g_return_if_fail (application->priv->is_registered);
1464
1465   if (application->priv->is_remote)
1466     g_application_impl_change_action_state (application->priv->impl,
1467                                             action_name, value,
1468                                             get_platform_data (application));
1469
1470   else
1471     g_action_group_change_action_state (application->priv->actions,
1472                                         action_name, value);
1473 }
1474
1475 static void
1476 g_application_activate_action (GActionGroup *action_group,
1477                                const gchar  *action_name,
1478                                GVariant     *parameter)
1479 {
1480   GApplication *application = G_APPLICATION (action_group);
1481
1482   g_return_if_fail (application->priv->is_registered);
1483
1484   if (application->priv->is_remote)
1485     g_application_impl_activate_action (application->priv->impl,
1486                                         action_name, parameter,
1487                                         get_platform_data (application));
1488
1489   else
1490     g_action_group_activate_action (application->priv->actions,
1491                                     action_name, parameter);
1492 }
1493
1494 static void
1495 g_application_action_group_iface_init (GActionGroupInterface *iface)
1496 {
1497   iface->has_action = g_application_has_action;
1498   iface->list_actions = g_application_list_actions;
1499
1500   iface->get_action_enabled = g_application_get_action_enabled;
1501   iface->get_action_parameter_type = g_application_get_action_parameter_type;
1502   iface->get_action_state_type = g_application_get_action_state_type;
1503   iface->get_action_state = g_application_get_action_state;
1504   iface->change_action_state = g_application_change_action_state;
1505   iface->activate_action = g_application_activate_action;
1506 }
1507
1508 /* Epilogue {{{1 */
1509 /* vim:set foldmethod=marker: */