gio/gactionmap.c

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at 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, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Authors: Ryan Lortie <desrt@desrt.ca>
  18  */
  19
  20 #include "config.h"
  21
  22 #include "gsimpleaction.h"
  23 #include "gactionmap.h"
  24 #include "gaction.h"
  25
  26 /**
  27  * SECTION:gactionmap
  28  * @title: GActionMap
  29  * @include: gio/gio.h
  30  * @short_description: Interface for action containers
  31  *
  32  * The GActionMap interface is implemented by #GActionGroup
  33  * implementations that operate by containing a number of
  34  * named #GAction instances, such as #GSimpleActionGroup.
  35  *
  36  * One useful application of this interface is to map the
  37  * names of actions from various action groups to unique,
  38  * prefixed names (e.g. by prepending "app." or "win.").
  39  * This is the motivation for the 'Map' part of the interface
  40  * name.
  41  *
  42  * Since: 2.32
  43  **/
  44
  45 /**
  46  * GActionMap:
  47  *
  48  * #GActionMap is an opaque data structure and can only be accessed
  49  * using the following functions.
  50  **/
  51
  52 /**
  53  * GActionMapInterface:
  54  * @lookup_action: the virtual function pointer for g_action_map_lookup_action()
  55  * @add_action: the virtual function pointer for g_action_map_add_action()
  56  * @remove_action: the virtual function pointer for g_action_map_remove_action()
  57  *
  58  * The virtual function table for #GActionMap.
  59  *
  60  * Since: 2.32
  61  **/
  62
  63 G_DEFINE_INTERFACE (GActionMap, g_action_map, G_TYPE_OBJECT)
  64
  65 static void
  66 g_action_map_default_init (GActionMapInterface *iface)
  67 {
  68 }
  69
  70 /**
  71  * g_action_map_lookup_action:
  72  * @action_map: a #GActionMap
  73  * @action_name: the name of an action
  74  *
  75  * Looks up the action with the name @action_name in @action_map.
  76  *
  77  * If no such action exists, returns %NULL.
  78  *
  79  * Returns: (transfer none): a #GAction, or %NULL
  80  *
  81  * Since: 2.32
  82  */
  83 GAction *
  84 g_action_map_lookup_action (GActionMap  *action_map,
  85                             const gchar *action_name)
  86 {
  87   return G_ACTION_MAP_GET_IFACE (action_map)
  88     ->lookup_action (action_map, action_name);
  89 }
  90
  91 /**
  92  * g_action_map_add_action:
  93  * @action_map: a #GActionMap
  94  * @action: a #GAction
  95  *
  96  * Adds an action to the @action_map.
  97  *
  98  * If the action map already contains an action with the same name
  99  * as @action then the old action is dropped from the action map.
 100  *
 101  * The action map takes its own reference on @action.
 102  *
 103  * Since: 2.32
 104  */
 105 void
 106 g_action_map_add_action (GActionMap *action_map,
 107                          GAction    *action)
 108 {
 109   G_ACTION_MAP_GET_IFACE (action_map)->add_action (action_map, action);
 110 }
 111
 112 /**
 113  * g_action_map_remove_action:
 114  * @action_map: a #GActionMap
 115  * @action_name: the name of the action
 116  *
 117  * Removes the named action from the action map.
 118  *
 119  * If no action of this name is in the map then nothing happens.
 120  *
 121  * Since: 2.32
 122  */
 123 void
 124 g_action_map_remove_action (GActionMap  *action_map,
 125                             const gchar *action_name)
 126 {
 127   G_ACTION_MAP_GET_IFACE (action_map)->remove_action (action_map, action_name);
 128 }
 129
 130 /**
 131  * GActionEntry:
 132  * @name: the name of the action
 133  * @activate: the callback to connect to the "activate" signal of the
 134  *            action.  Since GLib 2.40, this can be %NULL for stateful
 135  *            actions, in which case the default handler is used.  For
 136  *            boolean-stated actions with no parameter, this is a
 137  *            toggle.  For other state types (and parameter type equal
 138  *            to the state type) this will be a function that
 139  *            just calls @change_state (which you should provide).
 140  * @parameter_type: the type of the parameter that must be passed to the
 141  *                  activate function for this action, given as a single
 142  *                  GVariant type string (or %NULL for no parameter)
 143  * @state: the initial state for this action, given in
 144  *         [GVariant text format][gvariant-text].  The state is parsed
 145  *         with no extra type information, so type tags must be added to
 146  *         the string if they are necessary.  Stateless actions should
 147  *         give %NULL here.
 148  * @change_state: the callback to connect to the "change-state" signal
 149  *                of the action.  All stateful actions should provide a
 150  *                handler here; stateless actions should not.
 151  *
 152  * This struct defines a single action.  It is for use with
 153  * g_action_map_add_action_entries().
 154  *
 155  * The order of the items in the structure are intended to reflect
 156  * frequency of use.  It is permissible to use an incomplete initialiser
 157  * in order to leave some of the later values as %NULL.  All values
 158  * after @name are optional.  Additional optional fields may be added in
 159  * the future.
 160  *
 161  * See g_action_map_add_action_entries() for an example.
 162  **/
 163
 164 /**
 165  * g_action_map_add_action_entries:
 166  * @action_map: a #GActionMap
 167  * @entries: (array length=n_entries) (element-type GActionEntry): a pointer to
 168  *           the first item in an array of #GActionEntry structs
 169  * @n_entries: the length of @entries, or -1 if @entries is %NULL-terminated
 170  * @user_data: the user data for signal connections
 171  *
 172  * A convenience function for creating multiple #GSimpleAction instances
 173  * and adding them to a #GActionMap.
 174  *
 175  * Each action is constructed as per one #GActionEntry.
 176  *
 177  * |[<!-- language="C" -->
 178  * static void
 179  * activate_quit (GSimpleAction *simple,
 180  *                GVariant      *parameter,
 181  *                gpointer       user_data)
 182  * {
 183  *   exit (0);
 184  * }
 185  *
 186  * static void
 187  * activate_print_string (GSimpleAction *simple,
 188  *                        GVariant      *parameter,
 189  *                        gpointer       user_data)
 190  * {
 191  *   g_print ("%s\n", g_variant_get_string (parameter, NULL));
 192  * }
 193  *
 194  * static GActionGroup *
 195  * create_action_group (void)
 196  * {
 197  *   const GActionEntry entries[] = {
 198  *     { "quit",         activate_quit              },
 199  *     { "print-string", activate_print_string, "s" }
 200  *   };
 201  *   GSimpleActionGroup *group;
 202  *
 203  *   group = g_simple_action_group_new ();
 204  *   g_action_map_add_action_entries (G_ACTION_MAP (group), entries, G_N_ELEMENTS (entries), NULL);
 205  *
 206  *   return G_ACTION_GROUP (group);
 207  * }
 208  * ]|
 209  *
 210  * Since: 2.32
 211  */
 212 void
 213 g_action_map_add_action_entries (GActionMap         *action_map,
 214                                  const GActionEntry *entries,
 215                                  gint                n_entries,
 216                                  gpointer            user_data)
 217 {
 218   gint i;
 219
 220   g_return_if_fail (G_IS_ACTION_MAP (action_map));
 221   g_return_if_fail (entries != NULL || n_entries == 0);
 222
 223   for (i = 0; n_entries == -1 ? entries[i].name != NULL : i < n_entries; i++)
 224     {
 225       const GActionEntry *entry = &entries[i];
 226       const GVariantType *parameter_type;
 227       GSimpleAction *action;
 228
 229       if (entry->parameter_type)
 230         {
 231           if (!g_variant_type_string_is_valid (entry->parameter_type))
 232             {
 233               g_critical ("g_action_map_add_entries: the type "
 234                           "string '%s' given as the parameter type for "
 235                           "action '%s' is not a valid GVariant type "
 236                           "string.  This action will not be added.",
 237                           entry->parameter_type, entry->name);
 238               return;
 239             }
 240
 241           parameter_type = G_VARIANT_TYPE (entry->parameter_type);
 242         }
 243       else
 244         parameter_type = NULL;
 245
 246       if (entry->state)
 247         {
 248           GError *error = NULL;
 249           GVariant *state;
 250
 251           state = g_variant_parse (NULL, entry->state, NULL, NULL, &error);
 252           if (state == NULL)
 253             {
 254               g_critical ("g_action_map_add_entries: GVariant could "
 255                           "not parse the state value given for action '%s' "
 256                           "('%s'): %s.  This action will not be added.",
 257                           entry->name, entry->state, error->message);
 258               g_error_free (error);
 259               continue;
 260             }
 261
 262           action = g_simple_action_new_stateful (entry->name,
 263                                                  parameter_type,
 264                                                  state);
 265
 266           g_variant_unref (state);
 267         }
 268       else
 269         {
 270           action = g_simple_action_new (entry->name,
 271                                         parameter_type);
 272         }
 273
 274       if (entry->activate != NULL)
 275         g_signal_connect (action, "activate",
 276                           G_CALLBACK (entry->activate), user_data);
 277
 278       if (entry->change_state != NULL)
 279         g_signal_connect (action, "change-state",
 280                           G_CALLBACK (entry->change_state), user_data);
 281
 282       g_action_map_add_action (action_map, G_ACTION (action));
 283       g_object_unref (action);
 284     }
 285 }