/*

 * Copyright © 2010 Codethink Limited

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General

 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.

 *

 * Authors: Ryan Lortie <desrt@desrt.ca>

 */

#include "config.h"

#include "gsimpleaction.h"

#include "gactionmap.h"

#include "gaction.h"

/**

 * SECTION:gactionmap

 * @title: GActionMap

 * @include: gio/gio.h

 * @short_description: Interface for action containers

 *

 * The GActionMap interface is implemented by #GActionGroup

 * implementations that operate by containing a number of

 * named #GAction instances, such as #GSimpleActionGroup.

 *

 * One useful application of this interface is to map the

 * names of actions from various action groups to unique,

 * prefixed names (e.g. by prepending "app." or "win.").

 * This is the motivation for the 'Map' part of the interface

 * name.

 *

 * Since: 2.32

 **/

/**

 * GActionMap:

 *

 * #GActionMap is an opaque data structure and can only be accessed

 * using the following functions.

 **/

/**

 * GActionMapInterface:

 * @lookup_action: the virtual function pointer for g_action_map_lookup_action()

 * @add_action: the virtual function pointer for g_action_map_add_action()

 * @remove_action: the virtual function pointer for g_action_map_remove_action()

 *

 * The virtual function table for #GActionMap.

 *

 * Since: 2.32

 **/

G_DEFINE_INTERFACE (GActionMap, g_action_map, G_TYPE_OBJECT)

static void

g_action_map_default_init (GActionMapInterface *iface)

{

}

/**

 * g_action_map_lookup_action:

 * @action_map: a #GActionMap

 * @action_name: the name of an action

 *

 * Looks up the action with the name @action_name in @action_map.

 *

 * If no such action exists, returns %NULL.

 *

 * Returns: (transfer none): a #GAction, or %NULL

 *

 * Since: 2.32

 */

GAction *

g_action_map_lookup_action (GActionMap  *action_map,

                            const gchar *action_name)

{

  return G_ACTION_MAP_GET_IFACE (action_map)

    ->lookup_action (action_map, action_name);

}

/**

 * g_action_map_add_action:

 * @action_map: a #GActionMap

 * @action: a #GAction

 *

 * Adds an action to the @action_map.

 *

 * If the action map already contains an action with the same name

 * as @action then the old action is dropped from the action map.

 *

 * The action map takes its own reference on @action.

 *

 * Since: 2.32

 */

void

g_action_map_add_action (GActionMap *action_map,

                         GAction    *action)

{

  G_ACTION_MAP_GET_IFACE (action_map)->add_action (action_map, action);

}

/**

 * g_action_map_remove_action:

 * @action_map: a #GActionMap

 * @action_name: the name of the action

 *

 * Removes the named action from the action map.

 *

 * If no action of this name is in the map then nothing happens.

 *

 * Since: 2.32

 */

void

g_action_map_remove_action (GActionMap  *action_map,

                            const gchar *action_name)

{

  G_ACTION_MAP_GET_IFACE (action_map)->remove_action (action_map, action_name);

}

/**

 * GActionEntry:

 * @name: the name of the action

 * @activate: the callback to connect to the "activate" signal of the

 *            action.  Since GLib 2.40, this can be %NULL for stateful

 *            actions, in which case the default handler is used.  For

 *            boolean-stated actions with no parameter, this is a

 *            toggle.  For other state types (and parameter type equal

 *            to the state type) this will be a function that

 *            just calls @change_state (which you should provide).

 * @parameter_type: the type of the parameter that must be passed to the

 *                  activate function for this action, given as a single

 *                  GVariant type string (or %NULL for no parameter)

 * @state: the initial state for this action, given in

 *         [GVariant text format][gvariant-text].  The state is parsed

 *         with no extra type information, so type tags must be added to

 *         the string if they are necessary.  Stateless actions should

 *         give %NULL here.

 * @change_state: the callback to connect to the "change-state" signal

 *                of the action.  All stateful actions should provide a

 *                handler here; stateless actions should not.

 *

 * This struct defines a single action.  It is for use with

 * g_action_map_add_action_entries().

 *

 * The order of the items in the structure are intended to reflect

 * frequency of use.  It is permissible to use an incomplete initialiser

 * in order to leave some of the later values as %NULL.  All values

 * after @name are optional.  Additional optional fields may be added in

 * the future.

 *

 * See g_action_map_add_action_entries() for an example.

 **/

/**

 * g_action_map_add_action_entries:

 * @action_map: a #GActionMap

 * @entries: (array length=n_entries) (element-type GActionEntry): a pointer to

 *           the first item in an array of #GActionEntry structs

 * @n_entries: the length of @entries, or -1 if @entries is %NULL-terminated

 * @user_data: the user data for signal connections

 *

 * A convenience function for creating multiple #GSimpleAction instances

 * and adding them to a #GActionMap.

 *

 * Each action is constructed as per one #GActionEntry.

 *

 * |[

 * static void

 * activate_quit (GSimpleAction *simple,

 *                GVariant      *parameter,

 *                gpointer       user_data)

 * {

 *   exit (0);

 * }

 *

 * static void

 * activate_print_string (GSimpleAction *simple,

 *                        GVariant      *parameter,

 *                        gpointer       user_data)

 * {

 *   g_print ("%s\n", g_variant_get_string (parameter, NULL));

 * }

 *

 * static GActionGroup *

 * create_action_group (void)

 * {

 *   const GActionEntry entries[] = {

 *     { "quit",         activate_quit              },

 *     { "print-string", activate_print_string, "s" }

 *   };

 *   GSimpleActionGroup *group;

 *

 *   group = g_simple_action_group_new ();

 *   g_action_map_add_action_entries (G_ACTION_MAP (group), entries, G_N_ELEMENTS (entries), NULL);

 *

 *   return G_ACTION_GROUP (group);

 * }

 * ]|

 *

 * Since: 2.32

 */

void

g_action_map_add_action_entries (GActionMap         *action_map,

                                 const GActionEntry *entries,

                                 gint                n_entries,

                                 gpointer            user_data)

{

  gint i;

  g_return_if_fail (G_IS_ACTION_MAP (action_map));

  g_return_if_fail (entries != NULL || n_entries == 0);

  for (i = 0; n_entries == -1 ? entries[i].name != NULL : i < n_entries; i++)

    {

      const GActionEntry *entry = &entries[i];

      const GVariantType *parameter_type;

      GSimpleAction *action;

      if (entry->parameter_type)

        {

          if (!g_variant_type_string_is_valid (entry->parameter_type))

            {

              g_critical ("g_action_map_add_entries: the type "

                          "string '%s' given as the parameter type for "

                          "action '%s' is not a valid GVariant type "

                          "string.  This action will not be added.",

                          entry->parameter_type, entry->name);

              return;

            }

          parameter_type = G_VARIANT_TYPE (entry->parameter_type);

        }

      else

        parameter_type = NULL;

      if (entry->state)

        {

          GError *error = NULL;

          GVariant *state;

          state = g_variant_parse (NULL, entry->state, NULL, NULL, &error);

          if (state == NULL)

            {

              g_critical ("g_action_map_add_entries: GVariant could "

                          "not parse the state value given for action '%s' "

                          "('%s'): %s.  This action will not be added.",

                          entry->name, entry->state, error->message);

              g_error_free (error);

              continue;

            }

          action = g_simple_action_new_stateful (entry->name,

                                                 parameter_type,

                                                 state);

          g_variant_unref (state);

        }

      else

        {

          action = g_simple_action_new (entry->name,

                                        parameter_type);

        }

      if (entry->activate != NULL)

        g_signal_connect (action, "activate",

                          G_CALLBACK (entry->activate), user_data);

      if (entry->change_state != NULL)

        g_signal_connect (action, "change-state",

                          G_CALLBACK (entry->change_state), user_data);

      g_action_map_add_action (action_map, G_ACTION (action));

      g_object_unref (action);

    }

}