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 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   GMainLoop         *mainloop;
 153
 154   guint              inactivity_timeout_id;
 155   guint              inactivity_timeout;
 156   guint              use_count;
 157
 158   guint              is_registered : 1;
 159   guint              is_remote : 1;
 160
 161   GHashTable        *remote_actions;  /* string -> RemoteActionInfo */
 162   GApplicationImpl  *impl;
 163 };
 164
 165 enum
 166 {
 167   PROP_NONE,
 168   PROP_APPLICATION_ID,
 169   PROP_FLAGS,
 170   PROP_IS_REGISTERED,
 171   PROP_IS_REMOTE,
 172   PROP_INACTIVITY_TIMEOUT,
 173   PROP_ACTION_GROUP
 174 };
 175
 176 enum
 177 {
 178   SIGNAL_STARTUP,
 179   SIGNAL_ACTIVATE,
 180   SIGNAL_OPEN,
 181   SIGNAL_ACTION,
 182   SIGNAL_COMMAND_LINE,
 183   NR_SIGNALS
 184 };
 185
 186 static guint g_application_signals[NR_SIGNALS];
 187
 188 static void g_application_action_group_iface_init (GActionGroupInterface *);
 189 G_DEFINE_TYPE_WITH_CODE (GApplication, g_application, G_TYPE_OBJECT,
 190  G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP,
 191    g_application_action_group_iface_init))
 192
 193 /* vfunc defaults {{{1 */
 194 static void
 195 g_application_real_before_emit (GApplication *application,
 196                                 GVariant     *platform_data)
 197 {
 198 }
 199
 200 static void
 201 g_application_real_after_emit (GApplication *application,
 202                                GVariant     *platform_data)
 203 {
 204 }
 205
 206 static void
 207 g_application_real_startup (GApplication *application)
 208 {
 209 }
 210
 211 static void
 212 g_application_real_activate (GApplication *application)
 213 {
 214   if (!g_signal_has_handler_pending (application,
 215                                      g_application_signals[SIGNAL_ACTIVATE],
 216                                      0, TRUE) &&
 217       G_APPLICATION_GET_CLASS (application)->activate == g_application_real_activate)
 218     {
 219       static gboolean warned;
 220
 221       if (warned)
 222         return;
 223
 224       g_warning ("Your application does not implement "
 225                  "g_application_activate() and has no handlers connected "
 226                  "to the 'activate' signal.  It should do one of these.");
 227       warned = TRUE;
 228     }
 229 }
 230
 231 static void
 232 g_application_real_open (GApplication  *application,
 233                          GFile        **files,
 234                          gint           n_files,
 235                          const gchar   *hint)
 236 {
 237   if (!g_signal_has_handler_pending (application,
 238                                      g_application_signals[SIGNAL_OPEN],
 239                                      0, TRUE) &&
 240       G_APPLICATION_GET_CLASS (application)->open == g_application_real_open)
 241     {
 242       static gboolean warned;
 243
 244       if (warned)
 245         return;
 246
 247       g_warning ("Your application claims to support opening files "
 248                  "but does not implement g_application_open() and has no "
 249                  "handlers connected to the 'open' signal.");
 250       warned = TRUE;
 251     }
 252 }
 253
 254 static int
 255 g_application_real_command_line (GApplication            *application,
 256                                  GApplicationCommandLine *cmdline)
 257 {
 258   if (!g_signal_has_handler_pending (application,
 259                                      g_application_signals[SIGNAL_COMMAND_LINE],
 260                                      0, TRUE) &&
 261       G_APPLICATION_GET_CLASS (application)->command_line == g_application_real_command_line)
 262     {
 263       static gboolean warned;
 264
 265       if (warned)
 266         return 1;
 267
 268       g_warning ("Your application claims to support custom command line "
 269                  "handling but does not implement g_application_command_line() "
 270                  "and has no handlers connected to the 'command-line' signal.");
 271
 272       warned = TRUE;
 273     }
 274
 275     return 1;
 276 }
 277
 278 static gboolean
 279 g_application_real_local_command_line (GApplication   *application,
 280                                        gchar        ***arguments,
 281                                        int            *exit_status)
 282 {
 283   if (application->priv->flags & G_APPLICATION_HANDLES_COMMAND_LINE)
 284     return FALSE;
 285
 286   else
 287     {
 288       GError *error = NULL;
 289       gint n_args;
 290
 291       if (!g_application_register (application, NULL, &error))
 292         {
 293           g_critical ("%s", error->message);
 294           g_error_free (error);
 295           *exit_status = 1;
 296           return TRUE;
 297         }
 298
 299       n_args = g_strv_length (*arguments);
 300
 301       if (application->priv->flags & G_APPLICATION_IS_SERVICE)
 302         {
 303           if ((*exit_status = n_args > 1))
 304             {
 305               g_printerr ("GApplication service mode takes no arguments.\n");
 306               application->priv->flags &= ~G_APPLICATION_IS_SERVICE;
 307             }
 308
 309           return TRUE;
 310         }
 311
 312       if (n_args <= 1)
 313         {
 314           g_application_activate (application);
 315           *exit_status = 0;
 316         }
 317
 318       else
 319         {
 320           if (~application->priv->flags & G_APPLICATION_HANDLES_OPEN)
 321             {
 322               g_critical ("This application can not open files.");
 323               *exit_status = 1;
 324             }
 325           else
 326             {
 327               GFile **files;
 328               gint n_files;
 329               gint i;
 330
 331               n_files = n_args - 1;
 332               files = g_new (GFile *, n_files);
 333
 334               for (i = 0; i < n_files; i++)
 335                 files[i] = g_file_new_for_commandline_arg ((*arguments)[i + 1]);
 336
 337               g_application_open (application, files, n_files, "");
 338
 339               for (i = 0; i < n_files; i++)
 340                 g_object_unref (files[i]);
 341               g_free (files);
 342
 343               *exit_status = 0;
 344             }
 345         }
 346
 347       return TRUE;
 348     }
 349 }
 350
 351 static void
 352 g_application_real_add_platform_data (GApplication    *application,
 353                                       GVariantBuilder *builder)
 354 {
 355 }
 356
 357 static void
 358 g_application_real_quit_mainloop (GApplication *application)
 359 {
 360   if (application->priv->mainloop != NULL)
 361     g_main_loop_quit (application->priv->mainloop);
 362 }
 363
 364 static void
 365 g_application_real_run_mainloop (GApplication *application)
 366 {
 367   if (application->priv->mainloop == NULL)
 368     application->priv->mainloop = g_main_loop_new (NULL, FALSE);
 369
 370   g_main_loop_run (application->priv->mainloop);
 371 }
 372
 373 /* GObject implementation stuff {{{1 */
 374 static void
 375 g_application_set_property (GObject      *object,
 376                             guint         prop_id,
 377                             const GValue *value,
 378                             GParamSpec   *pspec)
 379 {
 380   GApplication *application = G_APPLICATION (object);
 381
 382   switch (prop_id)
 383     {
 384     case PROP_APPLICATION_ID:
 385       g_application_set_application_id (application,
 386                                         g_value_get_string (value));
 387       break;
 388
 389     case PROP_FLAGS:
 390       g_application_set_flags (application, g_value_get_flags (value));
 391       break;
 392
 393     case PROP_INACTIVITY_TIMEOUT:
 394       g_application_set_inactivity_timeout (application,
 395                                             g_value_get_uint (value));
 396       break;
 397
 398     case PROP_ACTION_GROUP:
 399       g_application_set_action_group (application,
 400                                       g_value_get_object (value));
 401       break;
 402
 403     default:
 404       g_assert_not_reached ();
 405     }
 406 }
 407
 408 /**
 409  * g_application_set_action_group:
 410  * @application: a #GApplication
 411  * @action_group: (allow-none): a #GActionGroup, or %NULL
 412  *
 413  * Sets or unsets the group of actions associated with the application.
 414  *
 415  * These actions are the actions that can be remotely invoked.
 416  *
 417  * It is an error to call this function after the application has been
 418  * registered.
 419  *
 420  * Since: 2.28
 421  **/
 422 void
 423 g_application_set_action_group (GApplication *application,
 424                                 GActionGroup *action_group)
 425 {
 426   g_return_if_fail (G_IS_APPLICATION (application));
 427   g_return_if_fail (!application->priv->is_registered);
 428
 429   if (application->priv->actions != NULL)
 430     g_object_unref (application->priv->actions);
 431
 432   application->priv->actions = action_group;
 433
 434   if (application->priv->actions != NULL)
 435     g_object_ref (application->priv->actions);
 436 }
 437
 438 static void
 439 g_application_get_property (GObject    *object,
 440                             guint       prop_id,
 441                             GValue     *value,
 442                             GParamSpec *pspec)
 443 {
 444   GApplication *application = G_APPLICATION (object);
 445
 446   switch (prop_id)
 447     {
 448     case PROP_APPLICATION_ID:
 449       g_value_set_string (value,
 450                           g_application_get_application_id (application));
 451       break;
 452
 453     case PROP_FLAGS:
 454       g_value_set_flags (value,
 455                          g_application_get_flags (application));
 456       break;
 457
 458     case PROP_IS_REGISTERED:
 459       g_value_set_boolean (value,
 460                            g_application_get_is_registered (application));
 461       break;
 462
 463     case PROP_IS_REMOTE:
 464       g_value_set_boolean (value,
 465                            g_application_get_is_remote (application));
 466       break;
 467
 468     case PROP_INACTIVITY_TIMEOUT:
 469       g_value_set_uint (value,
 470                         g_application_get_inactivity_timeout (application));
 471       break;
 472
 473     default:
 474       g_assert_not_reached ();
 475     }
 476 }
 477
 478 static void
 479 g_application_constructed (GObject *object)
 480 {
 481   GApplication *application = G_APPLICATION (object);
 482
 483   g_assert (application->priv->id != NULL);
 484 }
 485
 486 static void
 487 g_application_finalize (GObject *object)
 488 {
 489   GApplication *application = G_APPLICATION (object);
 490
 491   if (application->priv->impl)
 492     g_application_impl_destroy (application->priv->impl);
 493   g_free (application->priv->id);
 494
 495   if (application->priv->mainloop)
 496     g_main_loop_unref (application->priv->mainloop);
 497
 498   G_OBJECT_CLASS (g_application_parent_class)
 499     ->finalize (object);
 500 }
 501
 502 static void
 503 g_application_init (GApplication *application)
 504 {
 505   application->priv = G_TYPE_INSTANCE_GET_PRIVATE (application,
 506                                                    G_TYPE_APPLICATION,
 507                                                    GApplicationPrivate);
 508 }
 509
 510 static void
 511 g_application_class_init (GApplicationClass *class)
 512 {
 513   GObjectClass *object_class = G_OBJECT_CLASS (class);
 514
 515   object_class->constructed = g_application_constructed;
 516   object_class->finalize = g_application_finalize;
 517   object_class->get_property = g_application_get_property;
 518   object_class->set_property = g_application_set_property;
 519
 520   class->before_emit = g_application_real_before_emit;
 521   class->after_emit = g_application_real_after_emit;
 522   class->startup = g_application_real_startup;
 523   class->activate = g_application_real_activate;
 524   class->open = g_application_real_open;
 525   class->command_line = g_application_real_command_line;
 526   class->local_command_line = g_application_real_local_command_line;
 527   class->add_platform_data = g_application_real_add_platform_data;
 528   class->quit_mainloop = g_application_real_quit_mainloop;
 529   class->run_mainloop = g_application_real_run_mainloop;
 530
 531   g_object_class_install_property (object_class, PROP_APPLICATION_ID,
 532     g_param_spec_string ("application-id",
 533                          P_("Application identifier"),
 534                          P_("The unique identifier for the application"),
 535                          NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
 536                          G_PARAM_STATIC_STRINGS));
 537
 538   g_object_class_install_property (object_class, PROP_FLAGS,
 539     g_param_spec_flags ("flags",
 540                         P_("Application flags"),
 541                         P_("Flags specifying the behaviour of the application"),
 542                         G_TYPE_APPLICATION_FLAGS, G_APPLICATION_FLAGS_NONE,
 543                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 544
 545   g_object_class_install_property (object_class, PROP_IS_REGISTERED,
 546     g_param_spec_boolean ("is-registered",
 547                           P_("Is registered"),
 548                           P_("If g_application_register() has been called"),
 549                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 550
 551   g_object_class_install_property (object_class, PROP_IS_REMOTE,
 552     g_param_spec_boolean ("is-remote",
 553                           P_("Is remote"),
 554                           P_("If this application instance is remote"),
 555                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 556
 557   g_object_class_install_property (object_class, PROP_INACTIVITY_TIMEOUT,
 558     g_param_spec_uint ("inactivity-timeout",
 559                        P_("Inactivity timeout"),
 560                        P_("Iime (ms) to stay alive after becoming idle"),
 561                        0, G_MAXUINT, 0,
 562                        G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 563
 564   g_object_class_install_property (object_class, PROP_ACTION_GROUP,
 565     g_param_spec_object ("action-group",
 566                          P_("Action group"),
 567                          P_("The group of actions that the application exports"),
 568                          G_TYPE_ACTION_GROUP,
 569                          G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
 570
 571   /**
 572    * GApplication::startup:
 573    * @application: the application
 574    *
 575    * The ::startup signal is emitted on the primary instance immediately
 576    * after registration. See g_application_register().
 577    */
 578   g_application_signals[SIGNAL_STARTUP] =
 579     g_signal_new ("startup", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 580                   G_STRUCT_OFFSET (GApplicationClass, startup),
 581                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 582
 583   /**
 584    * GApplication::activate:
 585    * @application: the application
 586    *
 587    * The ::activate signal is emitted on the primary instance when an
 588    * activation occurs. See g_application_activate().
 589    */
 590   g_application_signals[SIGNAL_ACTIVATE] =
 591     g_signal_new ("activate", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 592                   G_STRUCT_OFFSET (GApplicationClass, activate),
 593                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 594
 595
 596   /**
 597    * GApplication::open:
 598    * @application: the application
 599    * @files: (array length=n_files) (element-type GFile): an array of #GFiles
 600    * @n_files: the length of @files
 601    * @hint: a hint provided by the calling instance
 602    *
 603    * The ::open signal is emitted on the primary instance when there are
 604    * files to open. See g_application_open() for more information.
 605    */
 606   g_application_signals[SIGNAL_OPEN] =
 607     g_signal_new ("open", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 608                   G_STRUCT_OFFSET (GApplicationClass, open),
 609                   NULL, NULL, _gio_marshal_VOID__POINTER_INT_STRING,
 610                   G_TYPE_NONE, 3, G_TYPE_POINTER, G_TYPE_INT, G_TYPE_STRING);
 611
 612   /**
 613    * GApplication::command-line:
 614    * @application: the application
 615    * @command_line: a #GApplicationCommandLine representing the
 616    *     passed commandline
 617    *
 618    * The ::command-line signal is emitted on the primary instance when
 619    * a commandline is not handled locally. See g_application_run() and
 620    * the #GApplicationCommandline documentation for more information.
 621    *
 622    * Returns: An integer that is set as the exit status for the calling
 623    *   process. See g_application_command_line_set_exit_status().
 624    */
 625   g_application_signals[SIGNAL_COMMAND_LINE] =
 626     g_signal_new ("command-line", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 627                   G_STRUCT_OFFSET (GApplicationClass, command_line),
 628                   g_signal_accumulator_first_wins, NULL,
 629                   _gio_marshal_INT__OBJECT,
 630                   G_TYPE_INT, 1, G_TYPE_APPLICATION_COMMAND_LINE);
 631
 632   g_type_class_add_private (class, sizeof (GApplicationPrivate));
 633 }
 634
 635 static GVariant *
 636 get_platform_data (GApplication *application)
 637 {
 638   GVariantBuilder *builder;
 639   GVariant *result;
 640
 641   builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));
 642
 643   {
 644     gchar *cwd = g_get_current_dir ();
 645     g_variant_builder_add (builder, "{sv}", "cwd",
 646                            g_variant_new_bytestring (cwd));
 647     g_free (cwd);
 648   }
 649
 650   if (application->priv->flags & G_APPLICATION_SEND_ENVIRONMENT)
 651     {
 652       GVariant *array;
 653       gchar **envp;
 654
 655       envp = g_get_environ ();
 656       array = g_variant_new_bytestring_array ((const gchar **) envp, -1);
 657       g_strfreev (envp);
 658
 659       g_variant_builder_add (builder, "{sv}", "environ", array);
 660     }
 661
 662   G_APPLICATION_GET_CLASS (application)->
 663     add_platform_data (application, builder);
 664
 665   result = g_variant_builder_end (builder);
 666   g_variant_builder_unref (builder);
 667
 668   return result;
 669 }
 670
 671 /* Application ID validity {{{1 */
 672
 673 /**
 674  * g_application_id_is_valid:
 675  * @application_id: a potential application identifier
 676  * @returns: %TRUE if @application_id is valid
 677  *
 678  * Checks if @application_id is a valid application identifier.
 679  *
 680  * A valid ID is required for calls to g_application_new() and
 681  * g_application_set_application_id().
 682  *
 683  * For convenience, the restrictions on application identifiers are
 684  * reproduced here:
 685  * <itemizedlist>
 686  *   <listitem>Application identifiers must contain only the ASCII characters "[A-Z][a-z][0-9]_-." and must not begin with a digit.</listitem>
 687  *   <listitem>Application identifiers must contain at least one '.' (period) character (and thus at least three elements).</listitem>
 688  *   <listitem>Application identifiers must not begin or end with a '.' (period) character.</listitem>
 689  *   <listitem>Application identifiers must not contain consecutive '.' (period) characters.</listitem>
 690  *   <listitem>Application identifiers must not exceed 255 characters.</listitem>
 691  * </itemizedlist>
 692  **/
 693 gboolean
 694 g_application_id_is_valid (const gchar *application_id)
 695 {
 696   gsize len;
 697   gboolean allow_dot;
 698   gboolean has_dot;
 699
 700   len = strlen (application_id);
 701
 702   if (len > 255)
 703     return FALSE;
 704
 705   if (!g_ascii_isalpha (application_id[0]))
 706     return FALSE;
 707
 708   if (application_id[len-1] == '.')
 709     return FALSE;
 710
 711   application_id++;
 712   allow_dot = TRUE;
 713   has_dot = FALSE;
 714   for (; *application_id; application_id++)
 715     {
 716       if (g_ascii_isalnum (*application_id) ||
 717           (*application_id == '-') ||
 718           (*application_id == '_'))
 719         {
 720           allow_dot = TRUE;
 721         }
 722       else if (allow_dot && *application_id == '.')
 723         {
 724           has_dot = TRUE;
 725           allow_dot = FALSE;
 726         }
 727       else
 728         return FALSE;
 729     }
 730
 731   if (!has_dot)
 732     return FALSE;
 733
 734   return TRUE;
 735 }
 736
 737 /* Public Constructor {{{1 */
 738 /**
 739  * g_application_new:
 740  * @application_id: the application id
 741  * @flags: the application flags
 742  * @returns: a new #GApplication instance
 743  *
 744  * Creates a new #GApplication instance.
 745  *
 746  * This function calls g_type_init() for you.
 747  *
 748  * The application id must be valid.  See g_application_id_is_valid().
 749  **/
 750 GApplication *
 751 g_application_new (const gchar       *application_id,
 752                    GApplicationFlags  flags)
 753 {
 754   g_return_val_if_fail (g_application_id_is_valid (application_id), NULL);
 755
 756   g_type_init ();
 757
 758   return g_object_new (G_TYPE_APPLICATION,
 759                        "application-id", application_id,
 760                        "flags", flags,
 761                        NULL);
 762 }
 763
 764 /* Simple get/set: application id, flags, inactivity timeout {{{1 */
 765 /**
 766  * g_application_get_application_id:
 767  * @application: a #GApplication
 768  * @returns: the identifier for @application, owned by @application
 769  *
 770  * Gets the unique identifier for @application.
 771  *
 772  * Since: 2.28
 773  **/
 774 const gchar *
 775 g_application_get_application_id (GApplication *application)
 776 {
 777   g_return_val_if_fail (G_IS_APPLICATION (application), NULL);
 778
 779   return application->priv->id;
 780 }
 781
 782 /**
 783  * g_application_set_application_id:
 784  * @application: a #GApplication
 785  * @application_id: the identifier for @application
 786  *
 787  * Sets the unique identifier for @application.
 788  *
 789  * The application id can only be modified if @application has not yet
 790  * been registered.
 791  *
 792  * The application id must be valid.  See g_application_id_is_valid().
 793  *
 794  * Since: 2.28
 795  **/
 796 void
 797 g_application_set_application_id (GApplication *application,
 798                                   const gchar  *application_id)
 799 {
 800   g_return_if_fail (G_IS_APPLICATION (application));
 801
 802   if (g_strcmp0 (application->priv->id, application_id) != 0)
 803     {
 804       g_return_if_fail (g_application_id_is_valid (application_id));
 805       g_return_if_fail (!application->priv->is_registered);
 806
 807       g_free (application->priv->id);
 808       application->priv->id = g_strdup (application_id);
 809
 810       g_object_notify (G_OBJECT (application), "application-id");
 811     }
 812 }
 813
 814 /**
 815  * g_application_get_flags:
 816  * @application: a #GApplication
 817  * @returns: the flags for @application
 818  *
 819  * Gets the flags for @application.
 820  *
 821  * See #GApplicationFlags.
 822  *
 823  * Since: 2.28
 824  **/
 825 GApplicationFlags
 826 g_application_get_flags (GApplication *application)
 827 {
 828   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
 829
 830   return application->priv->flags;
 831 }
 832
 833 /**
 834  * g_application_set_flags:
 835  * @application: a #GApplication
 836  * @flags: the flags for @application
 837  *
 838  * Sets the flags for @application.
 839  *
 840  * The flags can only be modified if @application has not yet been
 841  * registered.
 842  *
 843  * See #GApplicationFlags.
 844  *
 845  * Since: 2.28
 846  **/
 847 void
 848 g_application_set_flags (GApplication      *application,
 849                          GApplicationFlags  flags)
 850 {
 851   g_return_if_fail (G_IS_APPLICATION (application));
 852
 853   if (application->priv->flags != flags)
 854     {
 855       g_return_if_fail (!application->priv->is_registered);
 856
 857       application->priv->flags = flags;
 858
 859       g_object_notify (G_OBJECT (application), "flags");
 860     }
 861 }
 862
 863 /**
 864  * g_application_get_inactivity_timeout:
 865  * @application: a #GApplication
 866  *
 867  * Gets the current inactivity timeout for the application.
 868  *
 869  * This is the amount of time (in milliseconds) after the last call to
 870  * g_application_release() before the application stops running.
 871  *
 872  * Returns: the timeout, in milliseconds
 873  *
 874  * Since: 2.28
 875  **/
 876 guint
 877 g_application_get_inactivity_timeout (GApplication *application)
 878 {
 879   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
 880
 881   return application->priv->inactivity_timeout;
 882 }
 883
 884 /**
 885  * g_application_set_inactivity_timeout:
 886  * @application: a #GApplication
 887  * @inactivity_timeout: the timeout, in milliseconds
 888  *
 889  * Sets the current inactivity timeout for the application.
 890  *
 891  * This is the amount of time (in milliseconds) after the last call to
 892  * g_application_release() before the application stops running.
 893  *
 894  * This call has no side effects of its own.  The value set here is only
 895  * used for next time g_application_release() drops the use count to
 896  * zero.  Any timeouts currently in progress are not impacted.
 897  *
 898  * Returns: the timeout, in milliseconds
 899  *
 900  * Since: 2.28
 901  **/
 902 void
 903 g_application_set_inactivity_timeout (GApplication *application,
 904                                       guint         inactivity_timeout)
 905 {
 906   g_return_if_fail (G_IS_APPLICATION (application));
 907
 908   if (application->priv->inactivity_timeout != inactivity_timeout)
 909     {
 910       application->priv->inactivity_timeout = inactivity_timeout;
 911
 912       g_object_notify (G_OBJECT (application), "inactivity-timeout");
 913     }
 914 }
 915 /* Read-only property getters (is registered, is remote) {{{1 */
 916 /**
 917  * g_application_get_is_registered:
 918  * @application: a #GApplication
 919  * @returns: %TRUE if @application is registered
 920  *
 921  * Checks if @application is registered.
 922  *
 923  * An application is registered if g_application_register() has been
 924  * successfully called.
 925  *
 926  * Since: 2.28
 927  **/
 928 gboolean
 929 g_application_get_is_registered (GApplication *application)
 930 {
 931   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 932
 933   return application->priv->is_registered;
 934 }
 935
 936 /**
 937  * g_application_get_is_remote:
 938  * @application: a #GApplication
 939  * @returns: %TRUE if @application is remote
 940  *
 941  * Checks if @application is remote.
 942  *
 943  * If @application is remote then it means that another instance of
 944  * application already exists (the 'primary' instance).  Calls to
 945  * perform actions on @application will result in the actions being
 946  * performed by the primary instance.
 947  *
 948  * The value of this property cannot be accessed before
 949  * g_application_register() has been called.  See
 950  * g_application_get_is_registered().
 951  *
 952  * Since: 2.28
 953  **/
 954 gboolean
 955 g_application_get_is_remote (GApplication *application)
 956 {
 957   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 958   g_return_val_if_fail (application->priv->is_registered, FALSE);
 959
 960   return application->priv->is_remote;
 961 }
 962
 963 /* Register {{{1 */
 964 /**
 965  * g_application_register:
 966  * @application: a #GApplication
 967  * @cancellable: a #GCancellable, or %NULL
 968  * @error: a pointer to a NULL #GError, or %NULL
 969  * @returns: %TRUE if registration succeeded
 970  *
 971  * Attempts registration of the application.
 972  *
 973  * This is the point at which the application discovers if it is the
 974  * primary instance or merely acting as a remote for an already-existing
 975  * primary instance.  This is implemented by attempting to acquire the
 976  * application identifier as a unique bus name on the session bus using
 977  * GDBus.
 978  *
 979  * Due to the internal architecture of GDBus, method calls can be
 980  * dispatched at any time (even if a main loop is not running).  For
 981  * this reason, you must ensure that any object paths that you wish to
 982  * register are registered before calling this function.
 983  *
 984  * If the application has already been registered then %TRUE is
 985  * returned with no work performed.
 986  *
 987  * The #GApplication::startup signal is emitted if registration succeeds
 988  * and @application is the primary instance.
 989  *
 990  * In the event of an error (such as @cancellable being cancelled, or a
 991  * failure to connect to the session bus), %FALSE is returned and @error
 992  * is set appropriately.
 993  *
 994  * Note: the return value of this function is not an indicator that this
 995  * instance is or is not the primary instance of the application.  See
 996  * g_application_get_is_remote() for that.
 997  *
 998  * Since: 2.28
 999  **/
1000 gboolean
1001 g_application_register (GApplication  *application,
1002                         GCancellable  *cancellable,
1003                         GError       **error)
1004 {
1005   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
1006
1007   if (!application->priv->is_registered)
1008     {
1009       application->priv->impl =
1010         g_application_impl_register (application, application->priv->id,
1011                                      application->priv->flags,
1012                                      &application->priv->remote_actions,
1013                                      cancellable, error);
1014
1015       if (application->priv->impl == NULL)
1016         return FALSE;
1017
1018       application->priv->is_remote = application->priv->remote_actions != NULL;
1019       application->priv->is_registered = TRUE;
1020
1021       g_object_notify (G_OBJECT (application), "is-registered");
1022
1023       if (!application->priv->is_remote)
1024         g_signal_emit (application, g_application_signals[SIGNAL_STARTUP], 0);
1025     }
1026
1027   return TRUE;
1028 }
1029
1030 /* Hold/release {{{1 */
1031 /**
1032  * g_application_hold:
1033  * @application: a #GApplication
1034  *
1035  * Increases the use count of @application.
1036  *
1037  * Use this function to indicate that the application has a reason to
1038  * continue to run.  For example, g_application_hold() is called by GTK+
1039  * when a toplevel window is on the screen.
1040  *
1041  * To cancel the hold, call g_application_release().
1042  **/
1043 void
1044 g_application_hold (GApplication *application)
1045 {
1046   if (application->priv->inactivity_timeout_id)
1047     {
1048       g_source_remove (application->priv->inactivity_timeout_id);
1049       application->priv->inactivity_timeout_id = 0;
1050     }
1051
1052   application->priv->use_count++;
1053 }
1054
1055 static gboolean
1056 inactivity_timeout_expired (gpointer data)
1057 {
1058   GApplication *application = G_APPLICATION (data);
1059
1060   G_APPLICATION_GET_CLASS (application)
1061     ->quit_mainloop (application);
1062
1063   return FALSE;
1064 }
1065
1066
1067 /**
1068  * g_application_release:
1069  * @application: a #GApplication
1070  *
1071  * Decrease the use count of @application.
1072  *
1073  * When the use count reaches zero, the application will stop running.
1074  *
1075  * Never call this function except to cancel the effect of a previous
1076  * call to g_application_hold().
1077  **/
1078 void
1079 g_application_release (GApplication *application)
1080 {
1081   application->priv->use_count--;
1082
1083   if (application->priv->use_count == 0)
1084     {
1085       if (application->priv->inactivity_timeout)
1086         application->priv->inactivity_timeout_id =
1087           g_timeout_add (application->priv->inactivity_timeout,
1088                          inactivity_timeout_expired, application);
1089
1090       else
1091         G_APPLICATION_GET_CLASS (application)
1092           ->quit_mainloop (application);
1093     }
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   if (application->priv->use_count ||
1319       application->priv->inactivity_timeout_id)
1320     {
1321       G_APPLICATION_GET_CLASS (application)
1322         ->run_mainloop (application);
1323       status = 0;
1324     }
1325
1326   if (application->priv->impl)
1327     g_application_impl_flush (application->priv->impl);
1328
1329   return status;
1330 }
1331
1332 static gboolean
1333 g_application_has_action (GActionGroup *action_group,
1334                           const gchar  *action_name)
1335 {
1336   GApplication *application = G_APPLICATION (action_group);
1337
1338   g_return_val_if_fail (application->priv->is_registered, FALSE);
1339
1340   if (application->priv->remote_actions != NULL)
1341     return g_hash_table_lookup (application->priv->remote_actions,
1342                                 action_name) != NULL;
1343
1344   return application->priv->actions &&
1345          g_action_group_has_action (application->priv->actions, action_name);
1346 }
1347
1348 static gchar **
1349 g_application_list_actions (GActionGroup *action_group)
1350 {
1351   GApplication *application = G_APPLICATION (action_group);
1352
1353   g_return_val_if_fail (application->priv->is_registered, NULL);
1354
1355   if (application->priv->remote_actions != NULL)
1356     {
1357       GHashTableIter iter;
1358       gint n, i = 0;
1359       gchar **keys;
1360       gpointer key;
1361
1362       n = g_hash_table_size (application->priv->remote_actions);
1363       keys = g_new (gchar *, n + 1);
1364
1365       g_hash_table_iter_init (&iter, application->priv->remote_actions);
1366       while (g_hash_table_iter_next (&iter, &key, NULL))
1367         keys[i++] = g_strdup (key);
1368       g_assert_cmpint (i, ==, n);
1369       keys[n] = NULL;
1370
1371       return keys;
1372     }
1373
1374   else if (application->priv->actions != NULL)
1375     return g_action_group_list_actions (application->priv->actions);
1376
1377   else
1378     /* empty string array */
1379     return g_new0 (gchar *, 1);
1380 }
1381
1382 static gboolean
1383 g_application_get_action_enabled (GActionGroup *action_group,
1384                                   const gchar  *action_name)
1385 {
1386   GApplication *application = G_APPLICATION (action_group);
1387
1388   g_return_val_if_fail (application->priv->remote_actions != NULL ||
1389                         application->priv->actions != NULL, FALSE);
1390   g_return_val_if_fail (application->priv->is_registered, FALSE);
1391
1392   if (application->priv->remote_actions)
1393     {
1394       RemoteActionInfo *info;
1395
1396       info = g_hash_table_lookup (application->priv->remote_actions,
1397                                   action_name);
1398
1399       return info && info->enabled;
1400     }
1401
1402   return g_action_group_get_action_enabled (application->priv->actions,
1403                                             action_name);
1404 }
1405
1406 static const GVariantType *
1407 g_application_get_action_parameter_type (GActionGroup *action_group,
1408                                          const gchar  *action_name)
1409 {
1410   GApplication *application = G_APPLICATION (action_group);
1411
1412   g_return_val_if_fail (application->priv->remote_actions != NULL ||
1413                         application->priv->actions != NULL, NULL);
1414   g_return_val_if_fail (application->priv->is_registered, NULL);
1415
1416   if (application->priv->remote_actions)
1417     {
1418       RemoteActionInfo *info;
1419
1420       info = g_hash_table_lookup (application->priv->remote_actions,
1421                                   action_name);
1422
1423       if (info)
1424         return info->parameter_type;
1425       else
1426         return NULL;
1427     }
1428
1429   return g_action_group_get_action_parameter_type (application->priv->actions,
1430                                                    action_name);
1431 }
1432
1433 static const GVariantType *
1434 g_application_get_action_state_type (GActionGroup *action_group,
1435                                      const gchar  *action_name)
1436 {
1437   GApplication *application = G_APPLICATION (action_group);
1438
1439   g_return_val_if_fail (application->priv->remote_actions != NULL ||
1440                         application->priv->actions != NULL, NULL);
1441   g_return_val_if_fail (application->priv->is_registered, NULL);
1442
1443   if (application->priv->remote_actions)
1444     {
1445       RemoteActionInfo *info;
1446
1447       info = g_hash_table_lookup (application->priv->remote_actions,
1448                                   action_name);
1449
1450       if (info && info->state)
1451         return g_variant_get_type (info->state);
1452       else
1453         return NULL;
1454     }
1455
1456   return g_action_group_get_action_state_type (application->priv->actions,
1457                                                action_name);
1458 }
1459
1460 static GVariant *
1461 g_application_get_action_state (GActionGroup *action_group,
1462                                 const gchar  *action_name)
1463 {
1464   GApplication *application = G_APPLICATION (action_group);
1465
1466   g_return_val_if_fail (application->priv->remote_actions != NULL ||
1467                         application->priv->actions != NULL, NULL);
1468   g_return_val_if_fail (application->priv->is_registered, NULL);
1469
1470   if (application->priv->remote_actions)
1471     {
1472       RemoteActionInfo *info;
1473
1474       info = g_hash_table_lookup (application->priv->remote_actions,
1475                                   action_name);
1476
1477       if (info && info->state)
1478         return g_variant_ref (info->state);
1479       else
1480         return NULL;
1481     }
1482
1483   return g_action_group_get_action_state (application->priv->actions,
1484                                           action_name);
1485 }
1486
1487 static void
1488 g_application_change_action_state (GActionGroup *action_group,
1489                                    const gchar  *action_name,
1490                                    GVariant     *value)
1491 {
1492   GApplication *application = G_APPLICATION (action_group);
1493
1494   g_return_if_fail (application->priv->is_remote ||
1495                     application->priv->actions != NULL);
1496   g_return_if_fail (application->priv->is_registered);
1497
1498   if (application->priv->is_remote)
1499     g_application_impl_change_action_state (application->priv->impl,
1500                                             action_name, value,
1501                                             get_platform_data (application));
1502
1503   else
1504     g_action_group_change_action_state (application->priv->actions,
1505                                         action_name, value);
1506 }
1507
1508 static void
1509 g_application_activate_action (GActionGroup *action_group,
1510                                const gchar  *action_name,
1511                                GVariant     *parameter)
1512 {
1513   GApplication *application = G_APPLICATION (action_group);
1514
1515   g_return_if_fail (application->priv->is_remote ||
1516                     application->priv->actions != NULL);
1517   g_return_if_fail (application->priv->is_registered);
1518
1519   if (application->priv->is_remote)
1520     g_application_impl_activate_action (application->priv->impl,
1521                                         action_name, parameter,
1522                                         get_platform_data (application));
1523
1524   else
1525     g_action_group_activate_action (application->priv->actions,
1526                                     action_name, parameter);
1527 }
1528
1529 static void
1530 g_application_action_group_iface_init (GActionGroupInterface *iface)
1531 {
1532   iface->has_action = g_application_has_action;
1533   iface->list_actions = g_application_list_actions;
1534
1535   iface->get_action_enabled = g_application_get_action_enabled;
1536   iface->get_action_parameter_type = g_application_get_action_parameter_type;
1537   iface->get_action_state_type = g_application_get_action_state_type;
1538   iface->get_action_state = g_application_get_action_state;
1539   iface->change_action_state = g_application_change_action_state;
1540   iface->activate_action = g_application_activate_action;
1541 }
1542
1543 /* Epilogue {{{1 */
1544 /* vim:set foldmethod=marker: */