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 #include "gsettings.h"
  31
  32 #include "gioenumtypes.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 cannot 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. When dealing with
 109  * #GApplicationCommandline objects, the platform data is directly
 110  * available via g_application_command_line_get_cwd(),
 111  * g_application_command_line_get_environ() and
 112  * g_application_command_line_get_platform_data().
 113  *
 114  * As the name indicates, the platform data may vary depending on the
 115  * operating system, but it always includes the current directory (key
 116  * "cwd"), and optionally the environment (ie the set of environment
 117  * variables and their values) of the calling process (key "environ").
 118  * The environment is only added to the platform data if the
 119  * #G_APPLICATION_SEND_ENVIONMENT flag is set. GApplication subclasses
 120  * can add their own platform data by overriding the @add_platform_data
 121  * virtual function. For instance, #GtkApplication adds startup notification
 122  * data in this way.
 123  *
 124  * To parse commandline arguments you may handle the
 125  * #GApplication::command-line signal or override the local_command_line()
 126  * vfunc, to parse them in either the primary instance or the local instance,
 127  * respectively.
 128  *
 129  * <example id="gapplication-example-open"><title>Opening files with a GApplication</title>
 130  * <programlisting>
 131  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-open.c">
 132  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 133  * </xi:include>
 134  * </programlisting>
 135  * </example>
 136  *
 137  * <example id="gapplication-example-actions"><title>A GApplication with actions</title>
 138  * <programlisting>
 139  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-actions.c">
 140  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 141  * </xi:include>
 142  * </programlisting>
 143  * </example>
 144  */
 145
 146 struct _GApplicationPrivate
 147 {
 148   GApplicationFlags  flags;
 149   gchar             *id;
 150
 151   GActionGroup      *actions;
 152
 153   guint              inactivity_timeout_id;
 154   guint              inactivity_timeout;
 155   guint              use_count;
 156
 157   guint              is_registered : 1;
 158   guint              is_remote : 1;
 159   guint              did_startup : 1;
 160   guint              did_shutdown : 1;
 161
 162   GHashTable        *remote_actions;  /* string -> RemoteActionInfo */
 163   GApplicationImpl  *impl;
 164 };
 165
 166 enum
 167 {
 168   PROP_NONE,
 169   PROP_APPLICATION_ID,
 170   PROP_FLAGS,
 171   PROP_IS_REGISTERED,
 172   PROP_IS_REMOTE,
 173   PROP_INACTIVITY_TIMEOUT,
 174   PROP_ACTION_GROUP
 175 };
 176
 177 enum
 178 {
 179   SIGNAL_STARTUP,
 180   SIGNAL_SHUTDOWN,
 181   SIGNAL_ACTIVATE,
 182   SIGNAL_OPEN,
 183   SIGNAL_ACTION,
 184   SIGNAL_COMMAND_LINE,
 185   NR_SIGNALS
 186 };
 187
 188 static guint g_application_signals[NR_SIGNALS];
 189
 190 static void g_application_action_group_iface_init (GActionGroupInterface *);
 191 G_DEFINE_TYPE_WITH_CODE (GApplication, g_application, G_TYPE_OBJECT,
 192  G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP,
 193    g_application_action_group_iface_init))
 194
 195 /* vfunc defaults {{{1 */
 196 static void
 197 g_application_real_before_emit (GApplication *application,
 198                                 GVariant     *platform_data)
 199 {
 200 }
 201
 202 static void
 203 g_application_real_after_emit (GApplication *application,
 204                                GVariant     *platform_data)
 205 {
 206 }
 207
 208 static void
 209 g_application_real_startup (GApplication *application)
 210 {
 211   application->priv->did_startup = TRUE;
 212 }
 213
 214 static void
 215 g_application_real_shutdown (GApplication *application)
 216 {
 217   application->priv->did_shutdown = TRUE;
 218 }
 219
 220 static void
 221 g_application_real_activate (GApplication *application)
 222 {
 223   if (!g_signal_has_handler_pending (application,
 224                                      g_application_signals[SIGNAL_ACTIVATE],
 225                                      0, TRUE) &&
 226       G_APPLICATION_GET_CLASS (application)->activate == g_application_real_activate)
 227     {
 228       static gboolean warned;
 229
 230       if (warned)
 231         return;
 232
 233       g_warning ("Your application does not implement "
 234                  "g_application_activate() and has no handlers connected "
 235                  "to the 'activate' signal.  It should do one of these.");
 236       warned = TRUE;
 237     }
 238 }
 239
 240 static void
 241 g_application_real_open (GApplication  *application,
 242                          GFile        **files,
 243                          gint           n_files,
 244                          const gchar   *hint)
 245 {
 246   if (!g_signal_has_handler_pending (application,
 247                                      g_application_signals[SIGNAL_OPEN],
 248                                      0, TRUE) &&
 249       G_APPLICATION_GET_CLASS (application)->open == g_application_real_open)
 250     {
 251       static gboolean warned;
 252
 253       if (warned)
 254         return;
 255
 256       g_warning ("Your application claims to support opening files "
 257                  "but does not implement g_application_open() and has no "
 258                  "handlers connected to the 'open' signal.");
 259       warned = TRUE;
 260     }
 261 }
 262
 263 static int
 264 g_application_real_command_line (GApplication            *application,
 265                                  GApplicationCommandLine *cmdline)
 266 {
 267   if (!g_signal_has_handler_pending (application,
 268                                      g_application_signals[SIGNAL_COMMAND_LINE],
 269                                      0, TRUE) &&
 270       G_APPLICATION_GET_CLASS (application)->command_line == g_application_real_command_line)
 271     {
 272       static gboolean warned;
 273
 274       if (warned)
 275         return 1;
 276
 277       g_warning ("Your application claims to support custom command line "
 278                  "handling but does not implement g_application_command_line() "
 279                  "and has no handlers connected to the 'command-line' signal.");
 280
 281       warned = TRUE;
 282     }
 283
 284     return 1;
 285 }
 286
 287 static gboolean
 288 g_application_real_local_command_line (GApplication   *application,
 289                                        gchar        ***arguments,
 290                                        int            *exit_status)
 291 {
 292   if (application->priv->flags & G_APPLICATION_HANDLES_COMMAND_LINE)
 293     return FALSE;
 294
 295   else
 296     {
 297       GError *error = NULL;
 298       gint n_args;
 299
 300       if (!g_application_register (application, NULL, &error))
 301         {
 302           g_critical ("%s", error->message);
 303           g_error_free (error);
 304           *exit_status = 1;
 305           return TRUE;
 306         }
 307
 308       n_args = g_strv_length (*arguments);
 309
 310       if (application->priv->flags & G_APPLICATION_IS_SERVICE)
 311         {
 312           if ((*exit_status = n_args > 1))
 313             {
 314               g_printerr ("GApplication service mode takes no arguments.\n");
 315               application->priv->flags &= ~G_APPLICATION_IS_SERVICE;
 316             }
 317
 318           return TRUE;
 319         }
 320
 321       if (n_args <= 1)
 322         {
 323           g_application_activate (application);
 324           *exit_status = 0;
 325         }
 326
 327       else
 328         {
 329           if (~application->priv->flags & G_APPLICATION_HANDLES_OPEN)
 330             {
 331               g_critical ("This application can not open files.");
 332               *exit_status = 1;
 333             }
 334           else
 335             {
 336               GFile **files;
 337               gint n_files;
 338               gint i;
 339
 340               n_files = n_args - 1;
 341               files = g_new (GFile *, n_files);
 342
 343               for (i = 0; i < n_files; i++)
 344                 files[i] = g_file_new_for_commandline_arg ((*arguments)[i + 1]);
 345
 346               g_application_open (application, files, n_files, "");
 347
 348               for (i = 0; i < n_files; i++)
 349                 g_object_unref (files[i]);
 350               g_free (files);
 351
 352               *exit_status = 0;
 353             }
 354         }
 355
 356       return TRUE;
 357     }
 358 }
 359
 360 static void
 361 g_application_real_add_platform_data (GApplication    *application,
 362                                       GVariantBuilder *builder)
 363 {
 364 }
 365
 366 /* GObject implementation stuff {{{1 */
 367 static void
 368 g_application_set_property (GObject      *object,
 369                             guint         prop_id,
 370                             const GValue *value,
 371                             GParamSpec   *pspec)
 372 {
 373   GApplication *application = G_APPLICATION (object);
 374
 375   switch (prop_id)
 376     {
 377     case PROP_APPLICATION_ID:
 378       g_application_set_application_id (application,
 379                                         g_value_get_string (value));
 380       break;
 381
 382     case PROP_FLAGS:
 383       g_application_set_flags (application, g_value_get_flags (value));
 384       break;
 385
 386     case PROP_INACTIVITY_TIMEOUT:
 387       g_application_set_inactivity_timeout (application,
 388                                             g_value_get_uint (value));
 389       break;
 390
 391     case PROP_ACTION_GROUP:
 392       g_application_set_action_group (application,
 393                                       g_value_get_object (value));
 394       break;
 395
 396     default:
 397       g_assert_not_reached ();
 398     }
 399 }
 400
 401 /**
 402  * g_application_set_action_group:
 403  * @application: a #GApplication
 404  * @action_group: (allow-none): a #GActionGroup, or %NULL
 405  *
 406  * Sets or unsets the group of actions associated with the application.
 407  *
 408  * These actions are the actions that can be remotely invoked.
 409  *
 410  * It is an error to call this function after the application has been
 411  * registered.
 412  *
 413  * Since: 2.28
 414  **/
 415 void
 416 g_application_set_action_group (GApplication *application,
 417                                 GActionGroup *action_group)
 418 {
 419   g_return_if_fail (G_IS_APPLICATION (application));
 420   g_return_if_fail (!application->priv->is_registered);
 421
 422   if (application->priv->actions != NULL)
 423     g_object_unref (application->priv->actions);
 424
 425   application->priv->actions = action_group;
 426
 427   if (application->priv->actions != NULL)
 428     g_object_ref (application->priv->actions);
 429 }
 430
 431 static void
 432 g_application_get_property (GObject    *object,
 433                             guint       prop_id,
 434                             GValue     *value,
 435                             GParamSpec *pspec)
 436 {
 437   GApplication *application = G_APPLICATION (object);
 438
 439   switch (prop_id)
 440     {
 441     case PROP_APPLICATION_ID:
 442       g_value_set_string (value,
 443                           g_application_get_application_id (application));
 444       break;
 445
 446     case PROP_FLAGS:
 447       g_value_set_flags (value,
 448                          g_application_get_flags (application));
 449       break;
 450
 451     case PROP_IS_REGISTERED:
 452       g_value_set_boolean (value,
 453                            g_application_get_is_registered (application));
 454       break;
 455
 456     case PROP_IS_REMOTE:
 457       g_value_set_boolean (value,
 458                            g_application_get_is_remote (application));
 459       break;
 460
 461     case PROP_INACTIVITY_TIMEOUT:
 462       g_value_set_uint (value,
 463                         g_application_get_inactivity_timeout (application));
 464       break;
 465
 466     default:
 467       g_assert_not_reached ();
 468     }
 469 }
 470
 471 static void
 472 g_application_constructed (GObject *object)
 473 {
 474   GApplication *application = G_APPLICATION (object);
 475
 476   g_assert (application->priv->id != NULL);
 477 }
 478
 479 static void
 480 g_application_finalize (GObject *object)
 481 {
 482   GApplication *application = G_APPLICATION (object);
 483
 484   if (application->priv->impl)
 485     g_application_impl_destroy (application->priv->impl);
 486   g_free (application->priv->id);
 487
 488   G_OBJECT_CLASS (g_application_parent_class)
 489     ->finalize (object);
 490 }
 491
 492 static void
 493 g_application_init (GApplication *application)
 494 {
 495   application->priv = G_TYPE_INSTANCE_GET_PRIVATE (application,
 496                                                    G_TYPE_APPLICATION,
 497                                                    GApplicationPrivate);
 498 }
 499
 500 static void
 501 g_application_class_init (GApplicationClass *class)
 502 {
 503   GObjectClass *object_class = G_OBJECT_CLASS (class);
 504
 505   object_class->constructed = g_application_constructed;
 506   object_class->finalize = g_application_finalize;
 507   object_class->get_property = g_application_get_property;
 508   object_class->set_property = g_application_set_property;
 509
 510   class->before_emit = g_application_real_before_emit;
 511   class->after_emit = g_application_real_after_emit;
 512   class->startup = g_application_real_startup;
 513   class->shutdown = g_application_real_shutdown;
 514   class->activate = g_application_real_activate;
 515   class->open = g_application_real_open;
 516   class->command_line = g_application_real_command_line;
 517   class->local_command_line = g_application_real_local_command_line;
 518   class->add_platform_data = g_application_real_add_platform_data;
 519
 520   g_object_class_install_property (object_class, PROP_APPLICATION_ID,
 521     g_param_spec_string ("application-id",
 522                          P_("Application identifier"),
 523                          P_("The unique identifier for the application"),
 524                          NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
 525                          G_PARAM_STATIC_STRINGS));
 526
 527   g_object_class_install_property (object_class, PROP_FLAGS,
 528     g_param_spec_flags ("flags",
 529                         P_("Application flags"),
 530                         P_("Flags specifying the behaviour of the application"),
 531                         G_TYPE_APPLICATION_FLAGS, G_APPLICATION_FLAGS_NONE,
 532                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 533
 534   g_object_class_install_property (object_class, PROP_IS_REGISTERED,
 535     g_param_spec_boolean ("is-registered",
 536                           P_("Is registered"),
 537                           P_("If g_application_register() has been called"),
 538                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 539
 540   g_object_class_install_property (object_class, PROP_IS_REMOTE,
 541     g_param_spec_boolean ("is-remote",
 542                           P_("Is remote"),
 543                           P_("If this application instance is remote"),
 544                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 545
 546   g_object_class_install_property (object_class, PROP_INACTIVITY_TIMEOUT,
 547     g_param_spec_uint ("inactivity-timeout",
 548                        P_("Inactivity timeout"),
 549                        P_("Time (ms) to stay alive after becoming idle"),
 550                        0, G_MAXUINT, 0,
 551                        G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 552
 553   g_object_class_install_property (object_class, PROP_ACTION_GROUP,
 554     g_param_spec_object ("action-group",
 555                          P_("Action group"),
 556                          P_("The group of actions that the application exports"),
 557                          G_TYPE_ACTION_GROUP,
 558                          G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
 559
 560   /**
 561    * GApplication::startup:
 562    * @application: the application
 563    *
 564    * The ::startup signal is emitted on the primary instance immediately
 565    * after registration. See g_application_register().
 566    */
 567   g_application_signals[SIGNAL_STARTUP] =
 568     g_signal_new ("startup", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 569                   G_STRUCT_OFFSET (GApplicationClass, startup),
 570                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 571
 572   /**
 573    * GApplication::shutdown:
 574    * @application: the application
 575    *
 576    * The ::shutdown signal is emitted only on the registered primary instance
 577    * immediately after the main loop terminates.
 578    */
 579   g_application_signals[SIGNAL_SHUTDOWN] =
 580     g_signal_new ("shutdown", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 581                   G_STRUCT_OFFSET (GApplicationClass, shutdown),
 582                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 583
 584   /**
 585    * GApplication::activate:
 586    * @application: the application
 587    *
 588    * The ::activate signal is emitted on the primary instance when an
 589    * activation occurs. See g_application_activate().
 590    */
 591   g_application_signals[SIGNAL_ACTIVATE] =
 592     g_signal_new ("activate", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 593                   G_STRUCT_OFFSET (GApplicationClass, activate),
 594                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 595
 596
 597   /**
 598    * GApplication::open:
 599    * @application: the application
 600    * @files: (array length=n_files) (element-type GFile): an array of #GFiles
 601    * @n_files: the length of @files
 602    * @hint: a hint provided by the calling instance
 603    *
 604    * The ::open signal is emitted on the primary instance when there are
 605    * files to open. See g_application_open() for more information.
 606    */
 607   g_application_signals[SIGNAL_OPEN] =
 608     g_signal_new ("open", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 609                   G_STRUCT_OFFSET (GApplicationClass, open),
 610                   NULL, NULL, NULL,
 611                   G_TYPE_NONE, 3, G_TYPE_POINTER, G_TYPE_INT, G_TYPE_STRING);
 612
 613   /**
 614    * GApplication::command-line:
 615    * @application: the application
 616    * @command_line: a #GApplicationCommandLine representing the
 617    *     passed commandline
 618    *
 619    * The ::command-line signal is emitted on the primary instance when
 620    * a commandline is not handled locally. See g_application_run() and
 621    * the #GApplicationCommandline documentation for more information.
 622    *
 623    * Returns: An integer that is set as the exit status for the calling
 624    *   process. See g_application_command_line_set_exit_status().
 625    */
 626   g_application_signals[SIGNAL_COMMAND_LINE] =
 627     g_signal_new ("command-line", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 628                   G_STRUCT_OFFSET (GApplicationClass, command_line),
 629                   g_signal_accumulator_first_wins, NULL,
 630                   NULL,
 631                   G_TYPE_INT, 1, G_TYPE_APPLICATION_COMMAND_LINE);
 632
 633   g_type_class_add_private (class, sizeof (GApplicationPrivate));
 634 }
 635
 636 static GVariant *
 637 get_platform_data (GApplication *application)
 638 {
 639   GVariantBuilder *builder;
 640   GVariant *result;
 641
 642   builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));
 643
 644   {
 645     gchar *cwd = g_get_current_dir ();
 646     g_variant_builder_add (builder, "{sv}", "cwd",
 647                            g_variant_new_bytestring (cwd));
 648     g_free (cwd);
 649   }
 650
 651   if (application->priv->flags & G_APPLICATION_SEND_ENVIRONMENT)
 652     {
 653       GVariant *array;
 654       gchar **envp;
 655
 656       envp = g_get_environ ();
 657       array = g_variant_new_bytestring_array ((const gchar **) envp, -1);
 658       g_strfreev (envp);
 659
 660       g_variant_builder_add (builder, "{sv}", "environ", array);
 661     }
 662
 663   G_APPLICATION_GET_CLASS (application)->
 664     add_platform_data (application, builder);
 665
 666   result = g_variant_builder_end (builder);
 667   g_variant_builder_unref (builder);
 668
 669   return result;
 670 }
 671
 672 /* Application ID validity {{{1 */
 673
 674 /**
 675  * g_application_id_is_valid:
 676  * @application_id: a potential application identifier
 677  * @returns: %TRUE if @application_id is valid
 678  *
 679  * Checks if @application_id is a valid application identifier.
 680  *
 681  * A valid ID is required for calls to g_application_new() and
 682  * g_application_set_application_id().
 683  *
 684  * For convenience, the restrictions on application identifiers are
 685  * reproduced here:
 686  * <itemizedlist>
 687  *   <listitem>Application identifiers must contain only the ASCII characters "[A-Z][a-z][0-9]_-." and must not begin with a digit.</listitem>
 688  *   <listitem>Application identifiers must contain at least one '.' (period) character (and thus at least three elements).</listitem>
 689  *   <listitem>Application identifiers must not begin or end with a '.' (period) character.</listitem>
 690  *   <listitem>Application identifiers must not contain consecutive '.' (period) characters.</listitem>
 691  *   <listitem>Application identifiers must not exceed 255 characters.</listitem>
 692  * </itemizedlist>
 693  **/
 694 gboolean
 695 g_application_id_is_valid (const gchar *application_id)
 696 {
 697   gsize len;
 698   gboolean allow_dot;
 699   gboolean has_dot;
 700
 701   len = strlen (application_id);
 702
 703   if (len > 255)
 704     return FALSE;
 705
 706   if (!g_ascii_isalpha (application_id[0]))
 707     return FALSE;
 708
 709   if (application_id[len-1] == '.')
 710     return FALSE;
 711
 712   application_id++;
 713   allow_dot = TRUE;
 714   has_dot = FALSE;
 715   for (; *application_id; application_id++)
 716     {
 717       if (g_ascii_isalnum (*application_id) ||
 718           (*application_id == '-') ||
 719           (*application_id == '_'))
 720         {
 721           allow_dot = TRUE;
 722         }
 723       else if (allow_dot && *application_id == '.')
 724         {
 725           has_dot = TRUE;
 726           allow_dot = FALSE;
 727         }
 728       else
 729         return FALSE;
 730     }
 731
 732   if (!has_dot)
 733     return FALSE;
 734
 735   return TRUE;
 736 }
 737
 738 /* Public Constructor {{{1 */
 739 /**
 740  * g_application_new:
 741  * @application_id: the application id
 742  * @flags: the application flags
 743  * @returns: a new #GApplication instance
 744  *
 745  * Creates a new #GApplication instance.
 746  *
 747  * This function calls g_type_init() for you.
 748  *
 749  * The application id must be valid.  See g_application_id_is_valid().
 750  **/
 751 GApplication *
 752 g_application_new (const gchar       *application_id,
 753                    GApplicationFlags  flags)
 754 {
 755   g_return_val_if_fail (g_application_id_is_valid (application_id), NULL);
 756
 757   g_type_init ();
 758
 759   return g_object_new (G_TYPE_APPLICATION,
 760                        "application-id", application_id,
 761                        "flags", flags,
 762                        NULL);
 763 }
 764
 765 /* Simple get/set: application id, flags, inactivity timeout {{{1 */
 766 /**
 767  * g_application_get_application_id:
 768  * @application: a #GApplication
 769  * @returns: the identifier for @application, owned by @application
 770  *
 771  * Gets the unique identifier for @application.
 772  *
 773  * Since: 2.28
 774  **/
 775 const gchar *
 776 g_application_get_application_id (GApplication *application)
 777 {
 778   g_return_val_if_fail (G_IS_APPLICATION (application), NULL);
 779
 780   return application->priv->id;
 781 }
 782
 783 /**
 784  * g_application_set_application_id:
 785  * @application: a #GApplication
 786  * @application_id: the identifier for @application
 787  *
 788  * Sets the unique identifier for @application.
 789  *
 790  * The application id can only be modified if @application has not yet
 791  * been registered.
 792  *
 793  * The application id must be valid.  See g_application_id_is_valid().
 794  *
 795  * Since: 2.28
 796  **/
 797 void
 798 g_application_set_application_id (GApplication *application,
 799                                   const gchar  *application_id)
 800 {
 801   g_return_if_fail (G_IS_APPLICATION (application));
 802
 803   if (g_strcmp0 (application->priv->id, application_id) != 0)
 804     {
 805       g_return_if_fail (g_application_id_is_valid (application_id));
 806       g_return_if_fail (!application->priv->is_registered);
 807
 808       g_free (application->priv->id);
 809       application->priv->id = g_strdup (application_id);
 810
 811       g_object_notify (G_OBJECT (application), "application-id");
 812     }
 813 }
 814
 815 /**
 816  * g_application_get_flags:
 817  * @application: a #GApplication
 818  * @returns: the flags for @application
 819  *
 820  * Gets the flags for @application.
 821  *
 822  * See #GApplicationFlags.
 823  *
 824  * Since: 2.28
 825  **/
 826 GApplicationFlags
 827 g_application_get_flags (GApplication *application)
 828 {
 829   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
 830
 831   return application->priv->flags;
 832 }
 833
 834 /**
 835  * g_application_set_flags:
 836  * @application: a #GApplication
 837  * @flags: the flags for @application
 838  *
 839  * Sets the flags for @application.
 840  *
 841  * The flags can only be modified if @application has not yet been
 842  * registered.
 843  *
 844  * See #GApplicationFlags.
 845  *
 846  * Since: 2.28
 847  **/
 848 void
 849 g_application_set_flags (GApplication      *application,
 850                          GApplicationFlags  flags)
 851 {
 852   g_return_if_fail (G_IS_APPLICATION (application));
 853
 854   if (application->priv->flags != flags)
 855     {
 856       g_return_if_fail (!application->priv->is_registered);
 857
 858       application->priv->flags = flags;
 859
 860       g_object_notify (G_OBJECT (application), "flags");
 861     }
 862 }
 863
 864 /**
 865  * g_application_get_inactivity_timeout:
 866  * @application: a #GApplication
 867  *
 868  * Gets the current inactivity timeout for the application.
 869  *
 870  * This is the amount of time (in milliseconds) after the last call to
 871  * g_application_release() before the application stops running.
 872  *
 873  * Returns: the timeout, in milliseconds
 874  *
 875  * Since: 2.28
 876  **/
 877 guint
 878 g_application_get_inactivity_timeout (GApplication *application)
 879 {
 880   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
 881
 882   return application->priv->inactivity_timeout;
 883 }
 884
 885 /**
 886  * g_application_set_inactivity_timeout:
 887  * @application: a #GApplication
 888  * @inactivity_timeout: the timeout, in milliseconds
 889  *
 890  * Sets the current inactivity timeout for the application.
 891  *
 892  * This is the amount of time (in milliseconds) after the last call to
 893  * g_application_release() before the application stops running.
 894  *
 895  * This call has no side effects of its own.  The value set here is only
 896  * used for next time g_application_release() drops the use count to
 897  * zero.  Any timeouts currently in progress are not impacted.
 898  *
 899  * Since: 2.28
 900  **/
 901 void
 902 g_application_set_inactivity_timeout (GApplication *application,
 903                                       guint         inactivity_timeout)
 904 {
 905   g_return_if_fail (G_IS_APPLICATION (application));
 906
 907   if (application->priv->inactivity_timeout != inactivity_timeout)
 908     {
 909       application->priv->inactivity_timeout = inactivity_timeout;
 910
 911       g_object_notify (G_OBJECT (application), "inactivity-timeout");
 912     }
 913 }
 914 /* Read-only property getters (is registered, is remote) {{{1 */
 915 /**
 916  * g_application_get_is_registered:
 917  * @application: a #GApplication
 918  * @returns: %TRUE if @application is registered
 919  *
 920  * Checks if @application is registered.
 921  *
 922  * An application is registered if g_application_register() has been
 923  * successfully called.
 924  *
 925  * Since: 2.28
 926  **/
 927 gboolean
 928 g_application_get_is_registered (GApplication *application)
 929 {
 930   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 931
 932   return application->priv->is_registered;
 933 }
 934
 935 /**
 936  * g_application_get_is_remote:
 937  * @application: a #GApplication
 938  * @returns: %TRUE if @application is remote
 939  *
 940  * Checks if @application is remote.
 941  *
 942  * If @application is remote then it means that another instance of
 943  * application already exists (the 'primary' instance).  Calls to
 944  * perform actions on @application will result in the actions being
 945  * performed by the primary instance.
 946  *
 947  * The value of this property cannot be accessed before
 948  * g_application_register() has been called.  See
 949  * g_application_get_is_registered().
 950  *
 951  * Since: 2.28
 952  **/
 953 gboolean
 954 g_application_get_is_remote (GApplication *application)
 955 {
 956   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 957   g_return_val_if_fail (application->priv->is_registered, FALSE);
 958
 959   return application->priv->is_remote;
 960 }
 961
 962 /* Register {{{1 */
 963 /**
 964  * g_application_register:
 965  * @application: a #GApplication
 966  * @cancellable: a #GCancellable, or %NULL
 967  * @error: a pointer to a NULL #GError, or %NULL
 968  * @returns: %TRUE if registration succeeded
 969  *
 970  * Attempts registration of the application.
 971  *
 972  * This is the point at which the application discovers if it is the
 973  * primary instance or merely acting as a remote for an already-existing
 974  * primary instance.  This is implemented by attempting to acquire the
 975  * application identifier as a unique bus name on the session bus using
 976  * GDBus.
 977  *
 978  * Due to the internal architecture of GDBus, method calls can be
 979  * dispatched at any time (even if a main loop is not running).  For
 980  * this reason, you must ensure that any object paths that you wish to
 981  * register are registered before calling this function.
 982  *
 983  * If the application has already been registered then %TRUE is
 984  * returned with no work performed.
 985  *
 986  * The #GApplication::startup signal is emitted if registration succeeds
 987  * and @application is the primary instance.
 988  *
 989  * In the event of an error (such as @cancellable being cancelled, or a
 990  * failure to connect to the session bus), %FALSE is returned and @error
 991  * is set appropriately.
 992  *
 993  * Note: the return value of this function is not an indicator that this
 994  * instance is or is not the primary instance of the application.  See
 995  * g_application_get_is_remote() for that.
 996  *
 997  * Since: 2.28
 998  **/
 999 gboolean
1000 g_application_register (GApplication  *application,
1001                         GCancellable  *cancellable,
1002                         GError       **error)
1003 {
1004   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
1005
1006   if (!application->priv->is_registered)
1007     {
1008       if (~application->priv->flags & G_APPLICATION_NON_UNIQUE)
1009         {
1010           application->priv->impl =
1011             g_application_impl_register (application, application->priv->id,
1012                                          application->priv->flags,
1013                                          &application->priv->remote_actions,
1014                                          cancellable, error);
1015
1016           if (application->priv->impl == NULL)
1017             return FALSE;
1018         }
1019
1020       application->priv->is_remote = application->priv->remote_actions != NULL;
1021       application->priv->is_registered = TRUE;
1022
1023       g_object_notify (G_OBJECT (application), "is-registered");
1024
1025       if (!application->priv->is_remote)
1026         {
1027           g_signal_emit (application, g_application_signals[SIGNAL_STARTUP], 0);
1028
1029           if (!application->priv->did_startup)
1030             g_critical ("GApplication subclass '%s' failed to chain up on"
1031                         " ::startup (from start of override function)",
1032                         G_OBJECT_TYPE_NAME (application));
1033         }
1034     }
1035
1036   return TRUE;
1037 }
1038
1039 /* Hold/release {{{1 */
1040 /**
1041  * g_application_hold:
1042  * @application: a #GApplication
1043  *
1044  * Increases the use count of @application.
1045  *
1046  * Use this function to indicate that the application has a reason to
1047  * continue to run.  For example, g_application_hold() is called by GTK+
1048  * when a toplevel window is on the screen.
1049  *
1050  * To cancel the hold, call g_application_release().
1051  **/
1052 void
1053 g_application_hold (GApplication *application)
1054 {
1055   if (application->priv->inactivity_timeout_id)
1056     {
1057       g_source_remove (application->priv->inactivity_timeout_id);
1058       application->priv->inactivity_timeout_id = 0;
1059     }
1060
1061   application->priv->use_count++;
1062 }
1063
1064 static gboolean
1065 inactivity_timeout_expired (gpointer data)
1066 {
1067   GApplication *application = G_APPLICATION (data);
1068
1069   application->priv->inactivity_timeout_id = 0;
1070
1071   return FALSE;
1072 }
1073
1074
1075 /**
1076  * g_application_release:
1077  * @application: a #GApplication
1078  *
1079  * Decrease the use count of @application.
1080  *
1081  * When the use count reaches zero, the application will stop running.
1082  *
1083  * Never call this function except to cancel the effect of a previous
1084  * call to g_application_hold().
1085  **/
1086 void
1087 g_application_release (GApplication *application)
1088 {
1089   application->priv->use_count--;
1090
1091   if (application->priv->use_count == 0 && application->priv->inactivity_timeout)
1092     application->priv->inactivity_timeout_id = g_timeout_add (application->priv->inactivity_timeout,
1093                                                               inactivity_timeout_expired, application);
1094 }
1095
1096 /* Activate, Open {{{1 */
1097 /**
1098  * g_application_activate:
1099  * @application: a #GApplication
1100  *
1101  * Activates the application.
1102  *
1103  * In essence, this results in the #GApplication::activate() signal being
1104  * emitted in the primary instance.
1105  *
1106  * The application must be registered before calling this function.
1107  *
1108  * Since: 2.28
1109  **/
1110 void
1111 g_application_activate (GApplication *application)
1112 {
1113   g_return_if_fail (G_IS_APPLICATION (application));
1114   g_return_if_fail (application->priv->is_registered);
1115
1116   if (application->priv->is_remote)
1117     g_application_impl_activate (application->priv->impl,
1118                                  get_platform_data (application));
1119
1120   else
1121     g_signal_emit (application, g_application_signals[SIGNAL_ACTIVATE], 0);
1122 }
1123
1124 /**
1125  * g_application_open:
1126  * @application: a #GApplication
1127  * @files: (array length=n_files): an array of #GFiles to open
1128  * @n_files: the length of the @files array
1129  * @hint: a hint (or ""), but never %NULL
1130  *
1131  * Opens the given files.
1132  *
1133  * In essence, this results in the #GApplication::open signal being emitted
1134  * in the primary instance.
1135  *
1136  * @n_files must be greater than zero.
1137  *
1138  * @hint is simply passed through to the ::open signal.  It is
1139  * intended to be used by applications that have multiple modes for
1140  * opening files (eg: "view" vs "edit", etc).  Unless you have a need
1141  * for this functionality, you should use "".
1142  *
1143  * The application must be registered before calling this function
1144  * and it must have the %G_APPLICATION_HANDLES_OPEN flag set.
1145  *
1146  * Since: 2.28
1147  **/
1148 void
1149 g_application_open (GApplication  *application,
1150                     GFile        **files,
1151                     gint           n_files,
1152                     const gchar   *hint)
1153 {
1154   g_return_if_fail (G_IS_APPLICATION (application));
1155   g_return_if_fail (application->priv->flags &
1156                     G_APPLICATION_HANDLES_OPEN);
1157   g_return_if_fail (application->priv->is_registered);
1158
1159   if (application->priv->is_remote)
1160     g_application_impl_open (application->priv->impl,
1161                              files, n_files, hint,
1162                              get_platform_data (application));
1163
1164   else
1165     g_signal_emit (application, g_application_signals[SIGNAL_OPEN],
1166                    0, files, n_files, hint);
1167 }
1168
1169 /* Run {{{1 */
1170 /**
1171  * g_application_run:
1172  * @application: a #GApplication
1173  * @argc: the argc from main() (or 0 if @argv is %NULL)
1174  * @argv: (array length=argc) (allow-none): the argv from main(), or %NULL
1175  * @returns: the exit status
1176  *
1177  * Runs the application.
1178  *
1179  * This function is intended to be run from main() and its return value
1180  * is intended to be returned by main(). Although you are expected to pass
1181  * the @argc, @argv parameters from main() to this function, it is possible
1182  * to pass %NULL if @argv is not available or commandline handling is not
1183  * required.
1184  *
1185  * First, the local_command_line() virtual function is invoked.
1186  * This function always runs on the local instance. It gets passed a pointer
1187  * to a %NULL-terminated copy of @argv and is expected to remove the arguments
1188  * that it handled (shifting up remaining arguments). See
1189  * <xref linkend="gapplication-example-cmdline2"/> for an example of
1190  * parsing @argv manually. Alternatively, you may use the #GOptionContext API,
1191  * after setting <literal>argc = g_strv_length (argv);</literal>.
1192  *
1193  * The last argument to local_command_line() is a pointer to the @status
1194  * variable which can used to set the exit status that is returned from
1195  * g_application_run().
1196  *
1197  * If local_command_line() returns %TRUE, the command line is expected
1198  * to be completely handled, including possibly registering as the primary
1199  * instance, calling g_application_activate() or g_application_open(), etc.
1200  *
1201  * If local_command_line() returns %FALSE then the application is registered
1202  * and the #GApplication::command-line signal is emitted in the primary
1203  * instance (which may or may not be this instance). The signal handler
1204  * gets passed a #GApplicationCommandline object that (among other things)
1205  * contains the remaining commandline arguments that have not been handled
1206  * by local_command_line().
1207  *
1208  * If the application has the %G_APPLICATION_HANDLES_COMMAND_LINE
1209  * flag set then the default implementation of local_command_line()
1210  * always returns %FALSE immediately, resulting in the commandline
1211  * always being handled in the primary instance.
1212  *
1213  * Otherwise, the default implementation of local_command_line() tries
1214  * to do a couple of things that are probably reasonable for most
1215  * applications.  First, g_application_register() is called to attempt
1216  * to register the application.  If that works, then the command line
1217  * arguments are inspected.  If no commandline arguments are given, then
1218  * g_application_activate() is called.  If commandline arguments are
1219  * given and the %G_APPLICATION_HANDLES_OPEN flag is set then they
1220  * are assumed to be filenames and g_application_open() is called.
1221  *
1222  * If you need to handle commandline arguments that are not filenames,
1223  * and you don't mind commandline handling to happen in the primary
1224  * instance, you should set %G_APPLICATION_HANDLED_COMMAND_LINE and
1225  * process the commandline arguments in your #GApplication::command-line
1226  * signal handler, either manually or using the #GOptionContext API.
1227  *
1228  * If you are interested in doing more complicated local handling of the
1229  * commandline then you should implement your own #GApplication subclass
1230  * and override local_command_line(). In this case, you most likely want
1231  * to return %TRUE from your local_command_line() implementation to
1232  * suppress the default handling. See
1233  * <xref linkend="gapplication-example-cmdline2"/> for an example.
1234  *
1235  * If, after the above is done, the use count of the application is zero
1236  * then the exit status is returned immediately.  If the use count is
1237  * non-zero then the mainloop is run until the use count falls to zero,
1238  * at which point 0 is returned.
1239  *
1240  * If the %G_APPLICATION_IS_SERVICE flag is set, then the exiting at
1241  * use count of zero is delayed for a while (ie: the instance stays
1242  * around to provide its <emphasis>service</emphasis> to others).
1243  *
1244  * Since: 2.28
1245  **/
1246 int
1247 g_application_run (GApplication  *application,
1248                    int            argc,
1249                    char         **argv)
1250 {
1251   gchar **arguments;
1252   int status;
1253   gint i;
1254
1255   g_return_val_if_fail (G_IS_APPLICATION (application), 1);
1256   g_return_val_if_fail (argc == 0 || argv != NULL, 1);
1257
1258   arguments = g_new (gchar *, argc + 1);
1259   for (i = 0; i < argc; i++)
1260     arguments[i] = g_strdup (argv[i]);
1261   arguments[i] = NULL;
1262
1263   if (g_get_prgname () == NULL && argc > 0)
1264     {
1265       gchar *prgname;
1266
1267       prgname = g_path_get_basename (argv[0]);
1268       g_set_prgname (prgname);
1269       g_free (prgname);
1270     }
1271
1272   if (!G_APPLICATION_GET_CLASS (application)
1273         ->local_command_line (application, &arguments, &status))
1274     {
1275       GError *error = NULL;
1276
1277       if (!g_application_register (application, NULL, &error))
1278         {
1279           g_printerr ("%s", error->message);
1280           g_error_free (error);
1281           return 1;
1282         }
1283
1284       if (application->priv->is_remote)
1285         {
1286           GVariant *platform_data;
1287
1288           platform_data = get_platform_data (application);
1289           status = g_application_impl_command_line (application->priv->impl,
1290                                                     arguments, platform_data);
1291         }
1292       else
1293         {
1294           GApplicationCommandLine *cmdline;
1295           GVariant *v;
1296
1297           v = g_variant_new_bytestring_array ((const gchar **) arguments, -1);
1298           cmdline = g_object_new (G_TYPE_APPLICATION_COMMAND_LINE,
1299                                   "arguments", v, NULL);
1300           g_signal_emit (application,
1301                          g_application_signals[SIGNAL_COMMAND_LINE],
1302                          0, cmdline, &status);
1303           g_object_unref (cmdline);
1304         }
1305     }
1306
1307   g_strfreev (arguments);
1308
1309   if (application->priv->flags & G_APPLICATION_IS_SERVICE &&
1310       application->priv->is_registered &&
1311       !application->priv->use_count &&
1312       !application->priv->inactivity_timeout_id)
1313     {
1314       application->priv->inactivity_timeout_id =
1315         g_timeout_add (10000, inactivity_timeout_expired, application);
1316     }
1317
1318   while (application->priv->use_count || application->priv->inactivity_timeout_id)
1319     {
1320       g_main_context_iteration (NULL, TRUE);
1321       status = 0;
1322     }
1323
1324   if (!application->priv->is_remote)
1325     {
1326       g_signal_emit (application, g_application_signals[SIGNAL_SHUTDOWN], 0);
1327
1328       if (!application->priv->did_shutdown)
1329         g_critical ("GApplication subclass '%s' failed to chain up on"
1330                     " ::shutdown (from end of override function)",
1331                     G_OBJECT_TYPE_NAME (application));
1332     }
1333
1334   if (application->priv->impl)
1335     g_application_impl_flush (application->priv->impl);
1336
1337   g_settings_sync ();
1338
1339   return status;
1340 }
1341
1342 static gboolean
1343 g_application_has_action (GActionGroup *action_group,
1344                           const gchar  *action_name)
1345 {
1346   GApplication *application = G_APPLICATION (action_group);
1347
1348   g_return_val_if_fail (application->priv->is_registered, FALSE);
1349
1350   if (application->priv->remote_actions != NULL)
1351     return g_hash_table_lookup (application->priv->remote_actions,
1352                                 action_name) != NULL;
1353
1354   return application->priv->actions &&
1355          g_action_group_has_action (application->priv->actions, action_name);
1356 }
1357
1358 static gchar **
1359 g_application_list_actions (GActionGroup *action_group)
1360 {
1361   GApplication *application = G_APPLICATION (action_group);
1362
1363   g_return_val_if_fail (application->priv->is_registered, NULL);
1364
1365   if (application->priv->remote_actions != NULL)
1366     {
1367       GHashTableIter iter;
1368       gint n, i = 0;
1369       gchar **keys;
1370       gpointer key;
1371
1372       n = g_hash_table_size (application->priv->remote_actions);
1373       keys = g_new (gchar *, n + 1);
1374
1375       g_hash_table_iter_init (&iter, application->priv->remote_actions);
1376       while (g_hash_table_iter_next (&iter, &key, NULL))
1377         keys[i++] = g_strdup (key);
1378       g_assert_cmpint (i, ==, n);
1379       keys[n] = NULL;
1380
1381       return keys;
1382     }
1383
1384   else if (application->priv->actions != NULL)
1385     return g_action_group_list_actions (application->priv->actions);
1386
1387   else
1388     /* empty string array */
1389     return g_new0 (gchar *, 1);
1390 }
1391
1392 static gboolean
1393 g_application_get_action_enabled (GActionGroup *action_group,
1394                                   const gchar  *action_name)
1395 {
1396   GApplication *application = G_APPLICATION (action_group);
1397
1398   g_return_val_if_fail (application->priv->remote_actions != NULL ||
1399                         application->priv->actions != NULL, FALSE);
1400   g_return_val_if_fail (application->priv->is_registered, FALSE);
1401
1402   if (application->priv->remote_actions)
1403     {
1404       RemoteActionInfo *info;
1405
1406       info = g_hash_table_lookup (application->priv->remote_actions,
1407                                   action_name);
1408
1409       return info && info->enabled;
1410     }
1411
1412   return g_action_group_get_action_enabled (application->priv->actions,
1413                                             action_name);
1414 }
1415
1416 static const GVariantType *
1417 g_application_get_action_parameter_type (GActionGroup *action_group,
1418                                          const gchar  *action_name)
1419 {
1420   GApplication *application = G_APPLICATION (action_group);
1421
1422   g_return_val_if_fail (application->priv->remote_actions != NULL ||
1423                         application->priv->actions != NULL, NULL);
1424   g_return_val_if_fail (application->priv->is_registered, NULL);
1425
1426   if (application->priv->remote_actions)
1427     {
1428       RemoteActionInfo *info;
1429
1430       info = g_hash_table_lookup (application->priv->remote_actions,
1431                                   action_name);
1432
1433       if (info)
1434         return info->parameter_type;
1435       else
1436         return NULL;
1437     }
1438
1439   return g_action_group_get_action_parameter_type (application->priv->actions,
1440                                                    action_name);
1441 }
1442
1443 static const GVariantType *
1444 g_application_get_action_state_type (GActionGroup *action_group,
1445                                      const gchar  *action_name)
1446 {
1447   GApplication *application = G_APPLICATION (action_group);
1448
1449   g_return_val_if_fail (application->priv->remote_actions != NULL ||
1450                         application->priv->actions != NULL, NULL);
1451   g_return_val_if_fail (application->priv->is_registered, NULL);
1452
1453   if (application->priv->remote_actions)
1454     {
1455       RemoteActionInfo *info;
1456
1457       info = g_hash_table_lookup (application->priv->remote_actions,
1458                                   action_name);
1459
1460       if (info && info->state)
1461         return g_variant_get_type (info->state);
1462       else
1463         return NULL;
1464     }
1465
1466   return g_action_group_get_action_state_type (application->priv->actions,
1467                                                action_name);
1468 }
1469
1470 static GVariant *
1471 g_application_get_action_state (GActionGroup *action_group,
1472                                 const gchar  *action_name)
1473 {
1474   GApplication *application = G_APPLICATION (action_group);
1475
1476   g_return_val_if_fail (application->priv->remote_actions != NULL ||
1477                         application->priv->actions != NULL, NULL);
1478   g_return_val_if_fail (application->priv->is_registered, NULL);
1479
1480   if (application->priv->remote_actions)
1481     {
1482       RemoteActionInfo *info;
1483
1484       info = g_hash_table_lookup (application->priv->remote_actions,
1485                                   action_name);
1486
1487       if (info && info->state)
1488         return g_variant_ref (info->state);
1489       else
1490         return NULL;
1491     }
1492
1493   return g_action_group_get_action_state (application->priv->actions,
1494                                           action_name);
1495 }
1496
1497 static void
1498 g_application_change_action_state (GActionGroup *action_group,
1499                                    const gchar  *action_name,
1500                                    GVariant     *value)
1501 {
1502   GApplication *application = G_APPLICATION (action_group);
1503
1504   g_return_if_fail (application->priv->is_remote ||
1505                     application->priv->actions != NULL);
1506   g_return_if_fail (application->priv->is_registered);
1507
1508   if (application->priv->is_remote)
1509     g_application_impl_change_action_state (application->priv->impl,
1510                                             action_name, value,
1511                                             get_platform_data (application));
1512
1513   else
1514     g_action_group_change_action_state (application->priv->actions,
1515                                         action_name, value);
1516 }
1517
1518 static void
1519 g_application_activate_action (GActionGroup *action_group,
1520                                const gchar  *action_name,
1521                                GVariant     *parameter)
1522 {
1523   GApplication *application = G_APPLICATION (action_group);
1524
1525   g_return_if_fail (application->priv->is_remote ||
1526                     application->priv->actions != NULL);
1527   g_return_if_fail (application->priv->is_registered);
1528
1529   if (application->priv->is_remote)
1530     g_application_impl_activate_action (application->priv->impl,
1531                                         action_name, parameter,
1532                                         get_platform_data (application));
1533
1534   else
1535     g_action_group_activate_action (application->priv->actions,
1536                                     action_name, parameter);
1537 }
1538
1539 static void
1540 g_application_action_group_iface_init (GActionGroupInterface *iface)
1541 {
1542   iface->has_action = g_application_has_action;
1543   iface->list_actions = g_application_list_actions;
1544
1545   iface->get_action_enabled = g_application_get_action_enabled;
1546   iface->get_action_parameter_type = g_application_get_action_parameter_type;
1547   iface->get_action_state_type = g_application_get_action_state_type;
1548   iface->get_action_state = g_application_get_action_state;
1549   iface->change_action_state = g_application_change_action_state;
1550   iface->activate_action = g_application_activate_action;
1551 }
1552
1553 /* Epilogue {{{1 */
1554 /* vim:set foldmethod=marker: */