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 convenience, the restrictions on application identifiers are reproduced
  65  * here:
  66  * <itemizedlist>
  67  *   <listitem>Application identifiers must contain only the ASCII characters "[A-Z][a-z][0-9]_-" and must not begin with a digit.</listitem>
  68  *   <listitem>Application identifiers must contain at least one '.' (period) character (and thus at least two elements).</listitem>
  69  *   <listitem>Application identifiers must not begin with a '.' (period) character.</listitem>
  70  *   <listitem>Application identifiers must not contain consecutive '.' (period) characters.</listitem>
  71  *   <listitem>Application identifiers must not exceed 255 characters.</listitem>
  72  * </itemizedlist>
  73  *
  74  * GApplication provides convenient life cycle management by maintaining
  75  * a <firstterm>use count</firstterm> for the primary application instance.
  76  * The use count can be changed using g_application_hold() and
  77  * g_application_release(). If it drops to zero, the application exits.
  78  *
  79  * <example id="gapplication-example-open"><title>Opening files with a GApplication</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-open.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
  80  */
  81
  82 struct _GApplicationPrivate
  83 {
  84   GApplicationFlags  flags;
  85   gchar             *id;
  86
  87   GActionGroup      *actions;
  88   GMainLoop         *mainloop;
  89
  90   guint              inactivity_timeout_id;
  91   guint              inactivity_timeout;
  92   guint              use_count;
  93
  94   guint              is_registered : 1;
  95   guint              is_remote : 1;
  96
  97   GApplicationImpl  *impl;
  98 };
  99
 100 enum
 101 {
 102   PROP_NONE,
 103   PROP_APPLICATION_ID,
 104   PROP_FLAGS,
 105   PROP_IS_REGISTERED,
 106   PROP_IS_REMOTE,
 107   PROP_INACTIVITY_TIMEOUT,
 108   PROP_ACTION_GROUP
 109 };
 110
 111 enum
 112 {
 113   SIGNAL_STARTUP,
 114   SIGNAL_ACTIVATE,
 115   SIGNAL_OPEN,
 116   SIGNAL_ACTION,
 117   SIGNAL_COMMAND_LINE,
 118   NR_SIGNALS
 119 };
 120
 121 static guint g_application_signals[NR_SIGNALS];
 122
 123 static void g_application_action_group_iface_init (GActionGroupInterface *);
 124 G_DEFINE_TYPE_WITH_CODE (GApplication, g_application, G_TYPE_OBJECT,
 125  G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP,
 126    g_application_action_group_iface_init))
 127
 128 /* vfunc defaults {{{1 */
 129 static void
 130 g_application_real_before_emit (GApplication *application,
 131                                 GVariant     *platform_data)
 132 {
 133 }
 134
 135 static void
 136 g_application_real_after_emit (GApplication *application,
 137                                GVariant     *platform_data)
 138 {
 139 }
 140
 141 static void
 142 g_application_real_startup (GApplication *application)
 143 {
 144 }
 145
 146 static void
 147 g_application_real_activate (GApplication *application)
 148 {
 149   if (!g_signal_has_handler_pending (application,
 150                                      g_application_signals[SIGNAL_ACTIVATE],
 151                                      0, TRUE))
 152     {
 153       static gboolean warned;
 154
 155       if (warned)
 156         return;
 157
 158       g_warning ("Your application does not implement "
 159                  "g_application_activate() and has no handlers connected "
 160                  "to the 'activate' signal.  It should do one of these.");
 161       warned = TRUE;
 162     }
 163 }
 164
 165 static void
 166 g_application_real_open (GApplication  *application,
 167                          GFile        **files,
 168                          gint           n_files,
 169                          const gchar   *hint)
 170 {
 171   if (!g_signal_has_handler_pending (application,
 172                                      g_application_signals[SIGNAL_OPEN],
 173                                      0, TRUE))
 174     {
 175       static gboolean warned;
 176
 177       if (warned)
 178         return;
 179
 180       g_warning ("Your application claims to support opening files "
 181                  "but does not implement g_application_open() and has no "
 182                  "handlers connected to the 'open' signal.");
 183       warned = TRUE;
 184     }
 185 }
 186
 187 static int
 188 g_application_real_command_line (GApplication            *application,
 189                                  GApplicationCommandLine *cmdline)
 190 {
 191   static gboolean warned;
 192
 193   if (warned)
 194     return 1;
 195
 196   g_warning ("Your application claims to support custom command line "
 197              "handling but does not implement g_application_command_line() "
 198              "and has no handlers connected to the 'command-line' signal.");
 199
 200   warned = TRUE;
 201
 202   return 1;
 203 }
 204
 205 static gboolean
 206 g_application_real_local_command_line (GApplication   *application,
 207                                        gchar        ***arguments,
 208                                        int            *exit_status)
 209 {
 210   if (application->priv->flags & G_APPLICATION_HANDLES_COMMAND_LINE)
 211     return FALSE;
 212
 213   else
 214     {
 215       GError *error = NULL;
 216       gint n_args;
 217
 218       if (!g_application_register (application, NULL, &error))
 219         {
 220           g_critical ("%s", error->message);
 221           g_error_free (error);
 222           *exit_status = 1;
 223           return TRUE;
 224         }
 225
 226       n_args = g_strv_length (*arguments);
 227
 228       if (application->priv->flags & G_APPLICATION_IS_SERVICE)
 229         {
 230           if (n_args > 1)
 231             {
 232               g_printerr ("GApplication service mode takes no arguments.\n");
 233               application->priv->flags &= ~G_APPLICATION_IS_SERVICE;
 234             }
 235
 236           return TRUE;
 237         }
 238
 239       if (n_args <= 1)
 240         {
 241           g_application_activate (application);
 242           *exit_status = 0;
 243         }
 244
 245       else
 246         {
 247           if (~application->priv->flags & G_APPLICATION_HANDLES_OPEN)
 248             {
 249               g_critical ("This application can not open files.");
 250               *exit_status = 1;
 251             }
 252           else
 253             {
 254               GFile **files;
 255               gint n_files;
 256               gint i;
 257
 258               n_files = n_args - 1;
 259               files = g_new (GFile *, n_files);
 260
 261               for (i = 0; i < n_files; i++)
 262                 files[i] = g_file_new_for_commandline_arg ((*arguments)[i + 1]);
 263
 264               g_application_open (application, files, n_files, "");
 265
 266               for (i = 0; i < n_files; i++)
 267                 g_object_unref (files[i]);
 268               g_free (files);
 269
 270               *exit_status = 0;
 271             }
 272         }
 273
 274       return TRUE;
 275     }
 276 }
 277
 278 static void
 279 g_application_real_add_platform_data (GApplication    *application,
 280                                       GVariantBuilder *builder)
 281 {
 282 }
 283
 284 static void
 285 g_application_real_quit_mainloop (GApplication *application)
 286 {
 287   if (application->priv->mainloop != NULL)
 288     g_main_loop_quit (application->priv->mainloop);
 289 }
 290
 291 static void
 292 g_application_real_run_mainloop (GApplication *application)
 293 {
 294   if (application->priv->mainloop == NULL)
 295     application->priv->mainloop = g_main_loop_new (NULL, FALSE);
 296
 297   g_main_loop_run (application->priv->mainloop);
 298 }
 299
 300 /* GObject implementation stuff {{{1 */
 301 static void
 302 g_application_set_property (GObject      *object,
 303                             guint         prop_id,
 304                             const GValue *value,
 305                             GParamSpec   *pspec)
 306 {
 307   GApplication *application = G_APPLICATION (object);
 308
 309   switch (prop_id)
 310     {
 311     case PROP_APPLICATION_ID:
 312       g_application_set_application_id (application,
 313                                         g_value_get_string (value));
 314       break;
 315
 316     case PROP_FLAGS:
 317       g_application_set_flags (application, g_value_get_flags (value));
 318       break;
 319
 320     case PROP_INACTIVITY_TIMEOUT:
 321       g_application_set_inactivity_timeout (application,
 322                                             g_value_get_uint (value));
 323       break;
 324
 325     case PROP_ACTION_GROUP:
 326       g_application_set_action_group (application,
 327                                       g_value_get_object (value));
 328       break;
 329
 330     default:
 331       g_assert_not_reached ();
 332     }
 333 }
 334
 335 /**
 336  * g_application_set_action_group:
 337  * @application: a #GApplication
 338  * @action_group: a #GActionGroup, or %NULL
 339  *
 340  * Sets or unsets the group of actions associated with the application.
 341  *
 342  * These actions are the actions that can be remotely invoked.
 343  *
 344  * It is an error to call this function after the application has been
 345  * registered.
 346  *
 347  * Since: 2.28
 348  **/
 349 void
 350 g_application_set_action_group (GApplication *application,
 351                                 GActionGroup *action_group)
 352 {
 353   g_return_if_fail (G_IS_APPLICATION (application));
 354   g_return_if_fail (application->priv->is_registered);
 355
 356   if (application->priv->actions != NULL)
 357     g_object_unref (application->priv->actions);
 358
 359   application->priv->actions = action_group;
 360
 361   if (application->priv->actions != NULL)
 362     g_object_ref (application->priv->actions);
 363 }
 364
 365 static void
 366 g_application_get_property (GObject    *object,
 367                             guint       prop_id,
 368                             GValue     *value,
 369                             GParamSpec *pspec)
 370 {
 371   GApplication *application = G_APPLICATION (object);
 372
 373   switch (prop_id)
 374     {
 375     case PROP_APPLICATION_ID:
 376       g_value_set_string (value,
 377                           g_application_get_application_id (application));
 378       break;
 379
 380     case PROP_FLAGS:
 381       g_value_set_flags (value,
 382                          g_application_get_flags (application));
 383       break;
 384
 385     case PROP_IS_REGISTERED:
 386       g_value_set_boolean (value,
 387                            g_application_get_is_registered (application));
 388       break;
 389
 390     case PROP_IS_REMOTE:
 391       g_value_set_boolean (value,
 392                            g_application_get_is_remote (application));
 393       break;
 394
 395     case PROP_INACTIVITY_TIMEOUT:
 396       g_value_set_uint (value,
 397                         g_application_get_inactivity_timeout (application));
 398       break;
 399
 400     default:
 401       g_assert_not_reached ();
 402     }
 403 }
 404
 405 static void
 406 g_application_constructed (GObject *object)
 407 {
 408   GApplication *application = G_APPLICATION (object);
 409
 410   g_assert (application->priv->id != NULL);
 411 }
 412
 413 static void
 414 g_application_finalize (GObject *object)
 415 {
 416   GApplication *application = G_APPLICATION (object);
 417
 418   if (application->priv->impl)
 419     g_application_impl_destroy (application->priv->impl);
 420   g_free (application->priv->id);
 421
 422   if (application->priv->mainloop)
 423     g_main_loop_unref (application->priv->mainloop);
 424
 425   G_OBJECT_CLASS (g_application_parent_class)
 426     ->finalize (object);
 427 }
 428
 429 static void
 430 g_application_init (GApplication *application)
 431 {
 432   application->priv = G_TYPE_INSTANCE_GET_PRIVATE (application,
 433                                                    G_TYPE_APPLICATION,
 434                                                    GApplicationPrivate);
 435 }
 436
 437 static void
 438 g_application_class_init (GApplicationClass *class)
 439 {
 440   GObjectClass *object_class = G_OBJECT_CLASS (class);
 441
 442   object_class->constructed = g_application_constructed;
 443   object_class->finalize = g_application_finalize;
 444   object_class->get_property = g_application_get_property;
 445   object_class->set_property = g_application_set_property;
 446
 447   class->before_emit = g_application_real_before_emit;
 448   class->after_emit = g_application_real_after_emit;
 449   class->startup = g_application_real_startup;
 450   class->activate = g_application_real_activate;
 451   class->open = g_application_real_open;
 452   class->command_line = g_application_real_command_line;
 453   class->local_command_line = g_application_real_local_command_line;
 454   class->add_platform_data = g_application_real_add_platform_data;
 455   class->quit_mainloop = g_application_real_quit_mainloop;
 456   class->run_mainloop = g_application_real_run_mainloop;
 457
 458   g_object_class_install_property (object_class, PROP_APPLICATION_ID,
 459     g_param_spec_string ("application-id",
 460                          P_("Application identifier"),
 461                          P_("The unique identifier for the application"),
 462                          NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
 463                          G_PARAM_STATIC_STRINGS));
 464
 465   g_object_class_install_property (object_class, PROP_FLAGS,
 466     g_param_spec_flags ("flags",
 467                         P_("Application flags"),
 468                         P_("Flags specifying the behaviour of the application"),
 469                         G_TYPE_APPLICATION_FLAGS, G_APPLICATION_FLAGS_NONE,
 470                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 471
 472   g_object_class_install_property (object_class, PROP_IS_REGISTERED,
 473     g_param_spec_boolean ("is-registered",
 474                           P_("Is registered"),
 475                           P_("If g_application_register() has been called"),
 476                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 477
 478   g_object_class_install_property (object_class, PROP_IS_REMOTE,
 479     g_param_spec_boolean ("is-remote",
 480                           P_("Is remote"),
 481                           P_("If this application instance is remote"),
 482                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 483
 484   g_object_class_install_property (object_class, PROP_INACTIVITY_TIMEOUT,
 485     g_param_spec_boolean ("inactivity-timeout",
 486                           P_("Inactivity timeout"),
 487                           P_("Iime (ms) to stay alive after becoming idle"),
 488                           FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 489
 490   g_object_class_install_property (object_class, PROP_ACTION_GROUP,
 491     g_param_spec_object ("action-group",
 492                          P_("Action group"),
 493                          P_("The group of actions that the application exports"),
 494                          G_TYPE_ACTION_GROUP,
 495                          G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
 496
 497   /**
 498    * GApplication::startup:
 499    * @application: the application
 500    *
 501    * The ::startup signal is emitted on the primary instance immediately
 502    * after registration. See g_activation_register().
 503    */
 504   g_application_signals[SIGNAL_STARTUP] =
 505     g_signal_new ("startup", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 506                   G_STRUCT_OFFSET (GApplicationClass, startup),
 507                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 508
 509   /**
 510    * GApplication::activate:
 511    * @application: the application
 512    *
 513    * The ::activate signal is emitted on the primary instance when an
 514    * activation occurs. See g_application_activate().
 515    */
 516   g_application_signals[SIGNAL_ACTIVATE] =
 517     g_signal_new ("activate", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 518                   G_STRUCT_OFFSET (GApplicationClass, activate),
 519                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 520
 521
 522   /**
 523    * GApplication::open:
 524    * @application: the application
 525    * @files: an array of #GFile objects
 526    * @n_files: the length of @files
 527    * @hint: a hint provided by the calling instance
 528    *
 529    * The ::open signal is emitted on the primary instance when there are
 530    * files to open. See g_application_open() for more information.
 531    */
 532   g_application_signals[SIGNAL_OPEN] =
 533     g_signal_new ("open", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 534                   G_STRUCT_OFFSET (GApplicationClass, open),
 535                   NULL, NULL, _gio_marshal_VOID__POINTER_INT_STRING,
 536                   G_TYPE_NONE, 3, G_TYPE_POINTER, G_TYPE_INT, G_TYPE_STRING);
 537
 538   /**
 539    * GApplication::command-line:
 540    * @application: the application
 541    * @command_line: a #GApplicationCommandLine representing the
 542    *     passed commandline
 543    *
 544    * The ::command-line signal is emitted on the primary instance when
 545    * a commandline is not handled locally. See g_application_run() for
 546    * more information.
 547    */
 548   g_application_signals[SIGNAL_COMMAND_LINE] =
 549     g_signal_new ("command-line", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 550                   G_STRUCT_OFFSET (GApplicationClass, command_line),
 551                   g_signal_accumulator_first_wins, NULL,
 552                   _gio_marshal_INT__OBJECT,
 553                   G_TYPE_INT, 1, G_TYPE_APPLICATION_COMMAND_LINE);
 554
 555   g_type_class_add_private (class, sizeof (GApplicationPrivate));
 556 }
 557
 558 static GVariant *
 559 get_platform_data (GApplication *application)
 560 {
 561   GVariantBuilder *builder;
 562   GVariant *result;
 563
 564   builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));
 565
 566   {
 567     gchar *cwd = g_get_current_dir ();
 568     g_variant_builder_add (builder, "{sv}", "cwd",
 569                            g_variant_new_bytestring (cwd));
 570     g_free (cwd);
 571   }
 572
 573   G_APPLICATION_GET_CLASS (application)->
 574     add_platform_data (application, builder);
 575
 576   result = g_variant_builder_end (builder);
 577   g_variant_builder_unref (builder);
 578
 579   return result;
 580 }
 581
 582 /* Application ID validity {{{1 */
 583
 584 /**
 585  * g_application_id_is_valid:
 586  * @application_id: a potential application identifier
 587  * @returns: %TRUE if @application_id is valid
 588  *
 589  * Checks if @application_id is a valid application ID.  A valid ID is
 590  * required for calls to g_application_new() and
 591  * g_application_set_application_id().
 592  **/
 593 gboolean
 594 g_application_id_is_valid (const gchar *application_id)
 595 {
 596   gboolean allow_dot;
 597
 598   if (strlen (application_id) > 255)
 599     return FALSE;
 600
 601   if (!g_ascii_isalpha (*application_id))
 602     return FALSE;
 603
 604   application_id++;
 605   allow_dot = FALSE;
 606   for (; *application_id; application_id++)
 607     {
 608       if (g_ascii_isalnum (*application_id) ||
 609           (*application_id == '-') ||
 610           (*application_id == '_'))
 611         allow_dot = TRUE;
 612       else if (allow_dot && *application_id == '.')
 613         allow_dot = FALSE;
 614       else
 615         return FALSE;
 616     }
 617
 618   return TRUE;
 619 }
 620
 621 /* Public Constructor {{{1 */
 622 /**
 623  * g_application_new:
 624  * @application_id: the application id
 625  * @flags: the application flags
 626  * @returns: a new #GApplication instance
 627  *
 628  * Creates a new #GApplication instance.
 629  *
 630  * This function calls g_type_init() for you.
 631  *
 632  * The application id must be valid.  See g_application_id_is_valid().
 633  **/
 634 GApplication *
 635 g_application_new (const gchar       *application_id,
 636                    GApplicationFlags  flags)
 637 {
 638   g_return_val_if_fail (g_application_id_is_valid (application_id), NULL);
 639
 640   g_type_init ();
 641
 642   return g_object_new (G_TYPE_APPLICATION,
 643                        "application-id", application_id,
 644                        "flags", flags,
 645                        NULL);
 646 }
 647
 648 /* Simple get/set: application id, flags, inactivity timeout {{{1 */
 649 /**
 650  * g_application_get_application_id:
 651  * @application: a #GApplication
 652  * @returns: the identifier for @application, owned by @application
 653  *
 654  * Gets the unique identifier for @application.
 655  *
 656  * Since: 2.28
 657  **/
 658 const gchar *
 659 g_application_get_application_id (GApplication *application)
 660 {
 661   g_return_val_if_fail (G_IS_APPLICATION (application), NULL);
 662
 663   return application->priv->id;
 664 }
 665
 666 /**
 667  * g_application_set_application_id:
 668  * @application: a #GApplication
 669  * @application_id: the identifier for @application
 670  *
 671  * Sets the unique identifier for @application.
 672  *
 673  * The application id can only be modified if @application has not yet
 674  * been registered.
 675  *
 676  * The application id must be valid.  See g_application_id_is_valid().
 677  *
 678  * Since: 2.28
 679  **/
 680 void
 681 g_application_set_application_id (GApplication *application,
 682                                   const gchar  *application_id)
 683 {
 684   g_return_if_fail (G_IS_APPLICATION (application));
 685
 686   if (g_strcmp0 (application->priv->id, application_id) != 0)
 687     {
 688       g_return_if_fail (g_application_id_is_valid (application_id));
 689       g_return_if_fail (!application->priv->is_registered);
 690
 691       g_free (application->priv->id);
 692       application->priv->id = g_strdup (application_id);
 693
 694       g_object_notify (G_OBJECT (application), "application-id");
 695     }
 696 }
 697
 698 /**
 699  * g_application_get_flags:
 700  * @application: a #GApplication
 701  * @returns: the flags for @application
 702  *
 703  * Gets the flags for @application.
 704  *
 705  * See #GApplicationFlags.
 706  *
 707  * Since: 2.28
 708  **/
 709 GApplicationFlags
 710 g_application_get_flags (GApplication *application)
 711 {
 712   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
 713
 714   return application->priv->flags;
 715 }
 716
 717 /**
 718  * g_application_set_flags:
 719  * @application: a #GApplication
 720  * @flags: the flags for @application
 721  *
 722  * Sets the flags for @application.
 723  *
 724  * The flags can only be modified if @application has not yet been
 725  * registered.
 726  *
 727  * See #GApplicationFlags.
 728  *
 729  * Since: 2.28
 730  **/
 731 void
 732 g_application_set_flags (GApplication      *application,
 733                          GApplicationFlags  flags)
 734 {
 735   g_return_if_fail (G_IS_APPLICATION (application));
 736
 737   if (application->priv->flags != flags)
 738     {
 739       g_return_if_fail (!application->priv->is_registered);
 740
 741       application->priv->flags = flags;
 742
 743       g_object_notify (G_OBJECT (application), "flags");
 744     }
 745 }
 746
 747 /**
 748  * g_application_get_inactivity_timeout:
 749  * @application: a #GApplication
 750  *
 751  * Gets the current inactivity timeout for the application.
 752  *
 753  * This is the amount of time (in milliseconds) after the last call to
 754  * g_application_release() before the application stops running.
 755  *
 756  * Returns: the timeout, in milliseconds
 757  *
 758  * Since: 2.28
 759  **/
 760 guint
 761 g_application_get_inactivity_timeout (GApplication *application)
 762 {
 763   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
 764
 765   return application->priv->inactivity_timeout;
 766 }
 767
 768 /**
 769  * g_application_set_inactivity_timeout:
 770  * @application: a #GApplication
 771  * @inactivity_timeout: the timeout, in milliseconds
 772  *
 773  * Sets the current inactivity timeout for the application.
 774  *
 775  * This is the amount of time (in milliseconds) after the last call to
 776  * g_application_release() before the application stops running.
 777  *
 778  * This call has no side effects of its own.  The value set here is only
 779  * used for next time g_application_release() drops the use count to
 780  * zero.  Any timeouts currently in progress are not impacted.
 781  *
 782  * Returns: the timeout, in milliseconds
 783  *
 784  * Since: 2.28
 785  **/
 786 void
 787 g_application_set_inactivity_timeout (GApplication *application,
 788                                       guint         inactivity_timeout)
 789 {
 790   g_return_if_fail (G_IS_APPLICATION (application));
 791
 792   if (application->priv->inactivity_timeout != inactivity_timeout)
 793     {
 794       application->priv->inactivity_timeout = inactivity_timeout;
 795
 796       g_object_notify (G_OBJECT (application), "inactivity-timeout");
 797     }
 798 }
 799 /* Read-only property getters (is registered, is remote) {{{1 */
 800 /**
 801  * g_application_get_is_registered:
 802  * @application: a #GApplication
 803  * @returns: %TRUE if @application is registered
 804  *
 805  * Checks if @application is registered.
 806  *
 807  * An application is registered if g_application_register() has been
 808  * successfully called.
 809  *
 810  * Since: 2.28
 811  **/
 812 gboolean
 813 g_application_get_is_registered (GApplication *application)
 814 {
 815   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 816
 817   return application->priv->is_registered;
 818 }
 819
 820 /**
 821  * g_application_get_is_remote:
 822  * @application: a #GApplication
 823  * @returns: %TRUE if @application is remote
 824  *
 825  * Checks if @application is remote.
 826  *
 827  * If @application is remote then it means that another instance of
 828  * application already exists (the 'primary' instance).  Calls to
 829  * perform actions on @application will result in the actions being
 830  * performed by the primary instance.
 831  *
 832  * The value of this property can not be accessed before
 833  * g_application_register() has been called.  See
 834  * g_application_get_is_registered().
 835  *
 836  * Since: 2.28
 837  **/
 838 gboolean
 839 g_application_get_is_remote (GApplication *application)
 840 {
 841   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 842   g_return_val_if_fail (application->priv->is_registered, FALSE);
 843
 844   return application->priv->is_remote;
 845 }
 846
 847 /* Register {{{1 */
 848 /**
 849  * g_application_register:
 850  * @application: a #GApplication
 851  * @cancellable: a #GCancellable, or %NULL
 852  * @error: a pointer to a NULL #GError, or %NULL
 853  * @returns: %TRUE if registration succeeded
 854  *
 855  * Attempts registration of the application.
 856  *
 857  * This is the point at which the application discovers if it is the
 858  * primary instance or merely acting as a remote for an already-existing
 859  * primary instance.
 860  *
 861  * If the application has already been registered then %TRUE is
 862  * returned with no work performed.
 863  *
 864  * The startup() virtual function is invoked if registration succeeds
 865  * and @application is the primary instance.
 866  *
 867  * In the event of an error (such as @cancellable being cancelled, or a
 868  * failure to connect to the session bus), %FALSE is returned and @error
 869  * is set appropriately.
 870  *
 871  * Note: the return value of this function is not an indicator that this
 872  * instance is or is not the primary instance of the application.  See
 873  * g_application_get_is_remote() for that.
 874  *
 875  * Since: 2.28
 876  **/
 877 gboolean
 878 g_application_register (GApplication  *application,
 879                         GCancellable  *cancellable,
 880                         GError       **error)
 881 {
 882   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
 883
 884   if (!application->priv->is_registered)
 885     {
 886       gboolean is_remote;
 887       gboolean try;
 888
 889       /* don't try to be the primary instance if
 890        * G_APPLICATION_IS_LAUNCHER was specified.
 891        */
 892       try = !(application->priv->flags & G_APPLICATION_IS_LAUNCHER);
 893
 894       application->priv->impl =
 895         g_application_impl_register (application, application->priv->id,
 896                                      application->priv->flags,
 897                                      &is_remote, cancellable, error);
 898
 899       if (application->priv->impl == NULL)
 900         return FALSE;
 901
 902       application->priv->is_remote = is_remote;
 903       application->priv->is_registered = TRUE;
 904
 905       g_object_notify (G_OBJECT (application), "is-registered");
 906
 907       if (!is_remote)
 908         g_signal_emit (application, g_application_signals[SIGNAL_STARTUP], 0);
 909     }
 910
 911   return TRUE;
 912 }
 913
 914 /* Hold/release {{{1 */
 915 /**
 916  * g_application_hold:
 917  * @application: a #GApplication
 918  *
 919  * Increases the use count of @application.
 920  *
 921  * Use this function to indicate that the application has a reason to
 922  * continue to run.  For example, g_application_hold() is called by GTK+
 923  * when a toplevel window is on the screen.
 924  *
 925  * To cancel the hold, call g_application_release().
 926  **/
 927 void
 928 g_application_hold (GApplication *application)
 929 {
 930   if (application->priv->inactivity_timeout_id)
 931     {
 932       g_source_remove (application->priv->inactivity_timeout_id);
 933       application->priv->inactivity_timeout_id = 0;
 934     }
 935
 936   application->priv->use_count++;
 937 }
 938
 939 static gboolean
 940 inactivity_timeout_expired (gpointer data)
 941 {
 942   GApplication *application = G_APPLICATION (data);
 943
 944   G_APPLICATION_GET_CLASS (application)
 945     ->quit_mainloop (application);
 946
 947   return FALSE;
 948 }
 949
 950
 951 /**
 952  * g_application_release:
 953  * @application: a #GApplication
 954  *
 955  * Decrease the use count of @application.
 956  *
 957  * When the use count reaches zero, the application will stop running.
 958  *
 959  * Never call this function except to cancel the effect of a previous
 960  * call to g_application_hold().
 961  **/
 962 void
 963 g_application_release (GApplication *application)
 964 {
 965   application->priv->use_count--;
 966
 967   if (application->priv->use_count == 0)
 968     {
 969       if (application->priv->inactivity_timeout)
 970         application->priv->inactivity_timeout_id =
 971           g_timeout_add (application->priv->inactivity_timeout,
 972                          inactivity_timeout_expired, application);
 973
 974       else
 975         G_APPLICATION_GET_CLASS (application)
 976           ->quit_mainloop (application);
 977     }
 978 }
 979
 980 /* Activate, Open {{{1 */
 981 /**
 982  * g_application_activate:
 983  * @application: a #GApplication
 984  *
 985  * Activates the application.
 986  *
 987  * In essence, this results in the activate() virtual function being
 988  * invoked in the primary instance.
 989  *
 990  * The application must be registered before calling this function.
 991  *
 992  * Since: 2.28
 993  **/
 994 void
 995 g_application_activate (GApplication *application)
 996 {
 997   g_return_if_fail (G_IS_APPLICATION (application));
 998   g_return_if_fail (application->priv->is_registered);
 999
1000   if (application->priv->is_remote)
1001     g_application_impl_activate (application->priv->impl,
1002                                  get_platform_data (application));
1003
1004   else
1005     g_signal_emit (application, g_application_signals[SIGNAL_ACTIVATE], 0);
1006 }
1007
1008 /**
1009  * g_application_open:
1010  * @application: a #GApplication
1011  * @files: an array of #GFile<!-- -->s to open
1012  * @n_files: the length of the @files array
1013  * @hint: a hint (or ""), but never %NULL
1014  *
1015  * Opens the given files.
1016  *
1017  * In essence, this results in the open() virtual function being invoked
1018  * in the primary instance.
1019  *
1020  * @n_files must be greater than zero.
1021  *
1022  * @hint is simply passed through to the open() virtual function.  It is
1023  * intended to be used by applications that have multiple modes for
1024  * opening files (eg: "view" vs "edit", etc).  Unless you have a need
1025  * for this functionality, you should use "".
1026  *
1027  * The application must be registered before calling this function and
1028  * it must have the %G_APPLICATION_HANDLES_OPEN flag set.  The open()
1029  * virtual function should also be implemented in order for anything
1030  * meaningful to happen.
1031  *
1032  * Since: 2.28
1033  **/
1034 void
1035 g_application_open (GApplication  *application,
1036                     GFile        **files,
1037                     gint           n_files,
1038                     const gchar   *hint)
1039 {
1040   g_return_if_fail (G_IS_APPLICATION (application));
1041   g_return_if_fail (application->priv->flags &
1042                     G_APPLICATION_HANDLES_OPEN);
1043   g_return_if_fail (application->priv->is_registered);
1044
1045   if (application->priv->is_remote)
1046     g_application_impl_open (application->priv->impl,
1047                              files, n_files, hint,
1048                              get_platform_data (application));
1049
1050   else
1051     g_signal_emit (application, g_application_signals[SIGNAL_OPEN],
1052                    0, files, n_files, hint);
1053 }
1054
1055 /* Run {{{1 */
1056 /**
1057  * g_application_run:
1058  * @application: a #GApplication
1059  * @argc: the argc from main()
1060  * @argv: the argv from main()
1061  * @returns: the exit status
1062  *
1063  * Runs the application.
1064  *
1065  * This function is intended to be run from main() and its return value
1066  * is intended to be returned by main().
1067  *
1068  * First, the local_command_line() virtual function is invoked.  This
1069  * function always runs on the local instance.  If that function returns
1070  * %FALSE then the application is registered and the #GApplication::command-line
1071  * signal is emitted in the primary instance (which may or may not be
1072  * this instance).
1073  *
1074  * If the application has the %G_APPLICATION_HANDLES_COMMAND_LINE
1075  * flag set then the default implementation of local_command_line()
1076  * always returns %FALSE immediately, resulting in the commandline
1077  * always being handled in the primary instance.
1078  *
1079  * Otherwise, the default implementation of local_command_line() tries
1080  * to do a couple of things that are probably reasonable for most
1081  * applications.  First, g_application_register() is called to attempt
1082  * to register the application.  If that works, then the command line
1083  * arguments are inspected.  If no commandline arguments are given, then
1084  * g_application_activate() is called.  If commandline arguments are
1085  * given and the %G_APPLICATION_HANDLES_OPEN flag is set then they
1086  * are assumed to be filenames and g_application_open() is called.
1087  *
1088  * If you are interested in doing more complicated local handling of the
1089  * commandline then you should implement your own #GApplication subclass
1090  * and override local_command_line(). See
1091  * <xref linkend="gapplication-example-cmdline2"/> for an example.
1092  *
1093  * If, after the above is done, the use count of the application is zero
1094  * then the exit status is returned immediately.  If the use count is
1095  * non-zero then the mainloop is run until the use count falls to zero,
1096  * at which point 0 is returned.
1097  *
1098  * If the %G_APPLICATION_IS_SERVICE flag is set, then the exiting at
1099  * use count of zero is delayed for a while (ie: the instance stays
1100  * around to provide its <emphasis>service</emphasis> to others).
1101  *
1102  * Since: 2.28
1103  **/
1104 int
1105 g_application_run (GApplication  *application,
1106                    int            argc,
1107                    char         **argv)
1108 {
1109   gchar **arguments;
1110   int status;
1111   gint i;
1112
1113   g_return_val_if_fail (G_IS_APPLICATION (application), 1);
1114   g_return_val_if_fail (argc == 0 || argv != NULL, 1);
1115
1116   arguments = g_new (gchar *, argc + 1);
1117   for (i = 0; i < argc; i++)
1118     arguments[i] = g_strdup (argv[i]);
1119   arguments[i] = NULL;
1120
1121   if (g_get_prgname () == NULL && argc > 0)
1122     {
1123       gchar *prgname;
1124
1125       prgname = g_path_get_basename (argv[0]);
1126       g_set_prgname (prgname);
1127       g_free (prgname);
1128     }
1129
1130   if (!G_APPLICATION_GET_CLASS (application)
1131         ->local_command_line (application, &arguments, &status))
1132     {
1133       GError *error = NULL;
1134
1135       if (!g_application_register (application, NULL, &error))
1136         {
1137           g_printerr ("%s", error->message);
1138           g_error_free (error);
1139           return 1;
1140         }
1141
1142       if (application->priv->is_remote)
1143         {
1144           GVariant *platform_data;
1145
1146           platform_data = get_platform_data (application);
1147           status = g_application_impl_command_line (application->priv->impl,
1148                                                     arguments, platform_data);
1149         }
1150       else
1151         {
1152           GApplicationCommandLine *cmdline;
1153           GVariant *v;
1154
1155           v = g_variant_new_bytestring_array ((const gchar **) arguments, -1);
1156           cmdline = g_object_new (G_TYPE_APPLICATION_COMMAND_LINE,
1157                                   "arguments", v, NULL);
1158           g_signal_emit (application,
1159                          g_application_signals[SIGNAL_COMMAND_LINE],
1160                          0, cmdline, &status);
1161           g_object_unref (cmdline);
1162         }
1163     }
1164
1165   g_strfreev (arguments);
1166
1167   if (application->priv->flags & G_APPLICATION_IS_SERVICE &&
1168       !application->priv->use_count &&
1169       !application->priv->inactivity_timeout_id)
1170     {
1171       application->priv->inactivity_timeout_id =
1172         g_timeout_add (10000, inactivity_timeout_expired, application);
1173     }
1174
1175   if (application->priv->use_count ||
1176       application->priv->inactivity_timeout_id)
1177     {
1178       G_APPLICATION_GET_CLASS (application)
1179         ->run_mainloop (application);
1180       status = 0;
1181     }
1182
1183   if (application->priv->impl)
1184     g_application_impl_flush (application->priv->impl);
1185
1186   return status;
1187 }
1188
1189 static gboolean
1190 g_application_has_action (GActionGroup *action_group,
1191                           const gchar  *action_name)
1192 {
1193   GApplication *application = G_APPLICATION (action_group);
1194
1195   g_return_val_if_fail (application->priv->is_registered, FALSE);
1196
1197   return application->priv->actions &&
1198          g_action_group_has_action (application->priv->actions, action_name);
1199 }
1200
1201 static gchar **
1202 g_application_list_actions (GActionGroup *action_group)
1203 {
1204   GApplication *application = G_APPLICATION (action_group);
1205
1206   g_return_val_if_fail (application->priv->is_registered, NULL);
1207
1208   if (application->priv->actions != NULL)
1209     return g_action_group_list_actions (application->priv->actions);
1210
1211   else
1212     /* empty string array */
1213     return g_new0 (gchar *, 1);
1214 }
1215
1216 static gboolean
1217 g_application_get_action_enabled (GActionGroup *action_group,
1218                                   const gchar  *action_name)
1219 {
1220   GApplication *application = G_APPLICATION (action_group);
1221
1222   g_return_val_if_fail (application->priv->actions != NULL, FALSE);
1223   g_return_val_if_fail (application->priv->is_registered, FALSE);
1224
1225   return g_action_group_get_action_enabled (application->priv->actions,
1226                                             action_name);
1227 }
1228
1229 static const GVariantType *
1230 g_application_get_action_parameter_type (GActionGroup *action_group,
1231                                          const gchar  *action_name)
1232 {
1233   GApplication *application = G_APPLICATION (action_group);
1234
1235   g_return_val_if_fail (application->priv->actions != NULL, NULL);
1236   g_return_val_if_fail (application->priv->is_registered, NULL);
1237
1238   return g_action_group_get_action_parameter_type (application->priv->actions,
1239                                                    action_name);
1240 }
1241
1242 static const GVariantType *
1243 g_application_get_action_state_type (GActionGroup *action_group,
1244                                      const gchar  *action_name)
1245 {
1246   GApplication *application = G_APPLICATION (action_group);
1247
1248   g_return_val_if_fail (application->priv->actions != NULL, NULL);
1249   g_return_val_if_fail (application->priv->is_registered, NULL);
1250
1251   return g_action_group_get_action_state_type (application->priv->actions,
1252                                                action_name);
1253 }
1254
1255 static GVariant *
1256 g_application_get_action_state_hint (GActionGroup *action_group,
1257                                      const gchar  *action_name)
1258 {
1259   GApplication *application = G_APPLICATION (action_group);
1260
1261   g_return_val_if_fail (application->priv->actions != NULL, NULL);
1262   g_return_val_if_fail (application->priv->is_registered, NULL);
1263
1264   return g_action_group_get_action_state_hint (application->priv->actions,
1265                                                action_name);
1266 }
1267
1268 static GVariant *
1269 g_application_get_action_state (GActionGroup *action_group,
1270                                 const gchar  *action_name)
1271 {
1272   GApplication *application = G_APPLICATION (action_group);
1273
1274   g_return_val_if_fail (application->priv->actions != NULL, NULL);
1275   g_return_val_if_fail (application->priv->is_registered, NULL);
1276
1277   return g_action_group_get_action_state (application->priv->actions,
1278                                           action_name);
1279 }
1280
1281 static void
1282 g_application_change_action_state (GActionGroup *action_group,
1283                                    const gchar  *action_name,
1284                                    GVariant     *value)
1285 {
1286   GApplication *application = G_APPLICATION (action_group);
1287
1288   g_return_if_fail (application->priv->actions != NULL);
1289   g_return_if_fail (application->priv->is_registered);
1290
1291   g_action_group_change_action_state (application->priv->actions,
1292                                       action_name, value);
1293 }
1294
1295 static void
1296 g_application_activate_action (GActionGroup *action_group,
1297                                const gchar  *action_name,
1298                                GVariant     *parameter)
1299 {
1300   GApplication *application = G_APPLICATION (action_group);
1301
1302   g_return_if_fail (application->priv->actions != NULL);
1303   g_return_if_fail (application->priv->is_registered);
1304
1305   g_action_group_activate_action (application->priv->actions,
1306                                   action_name, parameter);
1307 }
1308
1309 static void
1310 g_application_action_group_iface_init (GActionGroupInterface *iface)
1311 {
1312   iface->has_action = g_application_has_action;
1313   iface->list_actions = g_application_list_actions;
1314
1315   iface->get_action_enabled = g_application_get_action_enabled;
1316   iface->get_action_parameter_type = g_application_get_action_parameter_type;
1317   iface->get_action_state_type = g_application_get_action_state_type;
1318   iface->get_action_state_hint = g_application_get_action_state_hint;
1319   iface->get_action_state = g_application_get_action_state;
1320   iface->change_action_state = g_application_change_action_state;
1321   iface->activate_action = g_application_activate_action;
1322 }
1323
1324 /* Epilogue {{{1 */
1325 /* vim:set foldmethod=marker: */