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