gio/gsimpleactiongroup.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 "gsimpleactiongroup.h"
  25
  26 #include "gsimpleaction.h"
  27 #include "gactionmap.h"
  28 #include "gaction.h"
  29
  30 /**
  31  * SECTION:gsimpleactiongroup
  32  * @title: GSimpleActionGroup
  33  * @short_description: A simple GActionGroup implementation
  34  *
  35  * #GSimpleActionGroup is a hash table filled with #GAction objects,
  36  * implementing the #GActionGroup and #GActionMap interfaces.
  37  **/
  38
  39 struct _GSimpleActionGroupPrivate
  40 {
  41   GHashTable *table;  /* string -> GAction */
  42 };
  43
  44 static void g_simple_action_group_iface_init (GActionGroupInterface *);
  45 static void g_simple_action_group_map_iface_init (GActionMapInterface *);
  46 G_DEFINE_TYPE_WITH_CODE (GSimpleActionGroup,
  47   g_simple_action_group, G_TYPE_OBJECT,
  48   G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP,
  49                          g_simple_action_group_iface_init);
  50   G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_MAP,
  51                          g_simple_action_group_map_iface_init))
  52
  53 static gchar **
  54 g_simple_action_group_list_actions (GActionGroup *group)
  55 {
  56   GSimpleActionGroup *simple = G_SIMPLE_ACTION_GROUP (group);
  57   GHashTableIter iter;
  58   gint n, i = 0;
  59   gchar **keys;
  60   gpointer key;
  61
  62   n = g_hash_table_size (simple->priv->table);
  63   keys = g_new (gchar *, n + 1);
  64
  65   g_hash_table_iter_init (&iter, simple->priv->table);
  66   while (g_hash_table_iter_next (&iter, &key, NULL))
  67     keys[i++] = g_strdup (key);
  68   g_assert_cmpint (i, ==, n);
  69   keys[n] = NULL;
  70
  71   return keys;
  72 }
  73
  74 static gboolean
  75 g_simple_action_group_query_action (GActionGroup        *group,
  76                                     const gchar         *action_name,
  77                                     gboolean            *enabled,
  78                                     const GVariantType **parameter_type,
  79                                     const GVariantType **state_type,
  80                                     GVariant           **state_hint,
  81                                     GVariant           **state)
  82 {
  83   GSimpleActionGroup *simple = G_SIMPLE_ACTION_GROUP (group);
  84   GAction *action;
  85
  86   action = g_hash_table_lookup (simple->priv->table, action_name);
  87
  88   if (action == NULL)
  89     return FALSE;
  90
  91   if (enabled)
  92     *enabled = g_action_get_enabled (action);
  93
  94   if (parameter_type)
  95     *parameter_type = g_action_get_parameter_type (action);
  96
  97   if (state_type)
  98     *state_type = g_action_get_state_type (action);
  99
 100   if (state_hint)
 101     *state_hint = g_action_get_state_hint (action);
 102
 103   if (state)
 104     *state = g_action_get_state (action);
 105
 106   return TRUE;
 107 }
 108
 109 static void
 110 g_simple_action_group_change_state (GActionGroup *group,
 111                                     const gchar  *action_name,
 112                                     GVariant     *value)
 113 {
 114   GSimpleActionGroup *simple = G_SIMPLE_ACTION_GROUP (group);
 115   GAction *action;
 116
 117   action = g_hash_table_lookup (simple->priv->table, action_name);
 118
 119   if (action == NULL)
 120     return;
 121
 122   g_action_change_state (action, value);
 123 }
 124
 125 static void
 126 g_simple_action_group_activate (GActionGroup *group,
 127                                 const gchar  *action_name,
 128                                 GVariant     *parameter)
 129 {
 130   GSimpleActionGroup *simple = G_SIMPLE_ACTION_GROUP (group);
 131   GAction *action;
 132
 133   action = g_hash_table_lookup (simple->priv->table, action_name);
 134
 135   if (action == NULL)
 136     return;
 137
 138   g_action_activate (action, parameter);
 139 }
 140
 141 static void
 142 action_enabled_notify (GAction     *action,
 143                        GParamSpec  *pspec,
 144                        gpointer     user_data)
 145 {
 146   g_action_group_action_enabled_changed (user_data,
 147                                          g_action_get_name (action),
 148                                          g_action_get_enabled (action));
 149 }
 150
 151 static void
 152 action_state_notify (GAction    *action,
 153                      GParamSpec *pspec,
 154                      gpointer    user_data)
 155 {
 156   GVariant *value;
 157
 158   value = g_action_get_state (action);
 159   g_action_group_action_state_changed (user_data,
 160                                        g_action_get_name (action),
 161                                        value);
 162   g_variant_unref (value);
 163 }
 164
 165 static void
 166 g_simple_action_group_disconnect (gpointer key,
 167                                   gpointer value,
 168                                   gpointer user_data)
 169 {
 170   g_signal_handlers_disconnect_by_func (value, action_enabled_notify,
 171                                         user_data);
 172   g_signal_handlers_disconnect_by_func (value, action_state_notify,
 173                                         user_data);
 174 }
 175
 176 static GAction *
 177 g_simple_action_group_lookup_action (GActionMap *action_map,
 178                                      const gchar        *action_name)
 179 {
 180   GSimpleActionGroup *simple = G_SIMPLE_ACTION_GROUP (action_map);
 181
 182   return g_hash_table_lookup (simple->priv->table, action_name);
 183 }
 184
 185 static void
 186 g_simple_action_group_add_action (GActionMap *action_map,
 187                                   GAction    *action)
 188 {
 189   GSimpleActionGroup *simple = G_SIMPLE_ACTION_GROUP (action_map);
 190   const gchar *action_name;
 191   GAction *old_action;
 192
 193   action_name = g_action_get_name (action);
 194   old_action = g_hash_table_lookup (simple->priv->table, action_name);
 195
 196   if (old_action != action)
 197     {
 198       if (old_action != NULL)
 199         {
 200           g_action_group_action_removed (G_ACTION_GROUP (simple),
 201                                          action_name);
 202           g_simple_action_group_disconnect (NULL, old_action, simple);
 203         }
 204
 205       g_signal_connect (action, "notify::enabled",
 206                         G_CALLBACK (action_enabled_notify), simple);
 207
 208       if (g_action_get_state_type (action) != NULL)
 209         g_signal_connect (action, "notify::state",
 210                           G_CALLBACK (action_state_notify), simple);
 211
 212       g_hash_table_insert (simple->priv->table,
 213                            g_strdup (action_name),
 214                            g_object_ref (action));
 215
 216       g_action_group_action_added (G_ACTION_GROUP (simple), action_name);
 217     }
 218 }
 219
 220 static void
 221 g_simple_action_group_remove_action (GActionMap  *action_map,
 222                                      const gchar *action_name)
 223 {
 224   GSimpleActionGroup *simple = G_SIMPLE_ACTION_GROUP (action_map);
 225   GAction *action;
 226
 227   action = g_hash_table_lookup (simple->priv->table, action_name);
 228
 229   if (action != NULL)
 230     {
 231       g_action_group_action_removed (G_ACTION_GROUP (simple), action_name);
 232       g_simple_action_group_disconnect (NULL, action, simple);
 233       g_hash_table_remove (simple->priv->table, action_name);
 234     }
 235 }
 236
 237 static void
 238 g_simple_action_group_finalize (GObject *object)
 239 {
 240   GSimpleActionGroup *simple = G_SIMPLE_ACTION_GROUP (object);
 241
 242   g_hash_table_foreach (simple->priv->table,
 243                         g_simple_action_group_disconnect,
 244                         simple);
 245   g_hash_table_unref (simple->priv->table);
 246
 247   G_OBJECT_CLASS (g_simple_action_group_parent_class)
 248     ->finalize (object);
 249 }
 250
 251 static void
 252 g_simple_action_group_init (GSimpleActionGroup *simple)
 253 {
 254   simple->priv = G_TYPE_INSTANCE_GET_PRIVATE (simple,
 255                                               G_TYPE_SIMPLE_ACTION_GROUP,
 256                                               GSimpleActionGroupPrivate);
 257   simple->priv->table = g_hash_table_new_full (g_str_hash, g_str_equal,
 258                                                g_free, g_object_unref);
 259 }
 260
 261 static void
 262 g_simple_action_group_class_init (GSimpleActionGroupClass *class)
 263 {
 264   GObjectClass *object_class = G_OBJECT_CLASS (class);
 265
 266   object_class->finalize = g_simple_action_group_finalize;
 267
 268   g_type_class_add_private (class, sizeof (GSimpleActionGroupPrivate));
 269 }
 270
 271 static void
 272 g_simple_action_group_iface_init (GActionGroupInterface *iface)
 273 {
 274   iface->list_actions = g_simple_action_group_list_actions;
 275   iface->query_action = g_simple_action_group_query_action;
 276   iface->change_action_state = g_simple_action_group_change_state;
 277   iface->activate_action = g_simple_action_group_activate;
 278 }
 279
 280 static void
 281 g_simple_action_group_map_iface_init (GActionMapInterface *iface)
 282 {
 283   iface->add_action = g_simple_action_group_add_action;
 284   iface->remove_action = g_simple_action_group_remove_action;
 285   iface->lookup_action = g_simple_action_group_lookup_action;
 286 }
 287
 288 /**
 289  * g_simple_action_group_new:
 290  *
 291  * Creates a new, empty, #GSimpleActionGroup.
 292  *
 293  * Returns: a new #GSimpleActionGroup
 294  *
 295  * Since: 2.28
 296  **/
 297 GSimpleActionGroup *
 298 g_simple_action_group_new (void)
 299 {
 300   return g_object_new (G_TYPE_SIMPLE_ACTION_GROUP, NULL);
 301 }
 302
 303 /**
 304  * g_simple_action_group_lookup:
 305  * @simple: a #GSimpleActionGroup
 306  * @action_name: the name of an action
 307  *
 308  * Looks up the action with the name @action_name in the group.
 309  *
 310  * If no such action exists, returns %NULL.
 311  *
 312  * Returns: (transfer none): a #GAction, or %NULL
 313  *
 314  * Since: 2.28
 315  */
 316 GAction *
 317 g_simple_action_group_lookup (GSimpleActionGroup *simple,
 318                               const gchar        *action_name)
 319 {
 320   g_return_val_if_fail (G_IS_SIMPLE_ACTION_GROUP (simple), NULL);
 321
 322   return g_action_map_lookup_action (G_ACTION_MAP (simple), action_name);
 323 }
 324
 325 /**
 326  * g_simple_action_group_insert:
 327  * @simple: a #GSimpleActionGroup
 328  * @action: a #GAction
 329  *
 330  * Adds an action to the action group.
 331  *
 332  * If the action group already contains an action with the same name as
 333  * @action then the old action is dropped from the group.
 334  *
 335  * The action group takes its own reference on @action.
 336  *
 337  * Since: 2.28
 338  **/
 339 void
 340 g_simple_action_group_insert (GSimpleActionGroup *simple,
 341                               GAction            *action)
 342 {
 343   g_return_if_fail (G_IS_SIMPLE_ACTION_GROUP (simple));
 344
 345   g_action_map_add_action (G_ACTION_MAP (simple), action);
 346 }
 347
 348 /**
 349  * g_simple_action_group_remove:
 350  * @simple: a #GSimpleActionGroup
 351  * @action_name: the name of the action
 352  *
 353  * Removes the named action from the action group.
 354  *
 355  * If no action of this name is in the group then nothing happens.
 356  *
 357  * Since: 2.28
 358  **/
 359 void
 360 g_simple_action_group_remove (GSimpleActionGroup *simple,
 361                               const gchar        *action_name)
 362 {
 363   g_return_if_fail (G_IS_SIMPLE_ACTION_GROUP (simple));
 364
 365   g_action_map_remove_action (G_ACTION_MAP (simple), action_name);
 366 }
 367
 368
 369 /**
 370  * g_simple_action_group_add_entries:
 371  * @simple: a #GSimpleActionGroup
 372  * @entries: (array length=n_entries): a pointer to the first item in
 373  *           an array of #GActionEntry structs
 374  * @n_entries: the length of @entries, or -1
 375  * @user_data: the user data for signal connections
 376  *
 377  * A convenience function for creating multiple #GSimpleAction instances
 378  * and adding them to the action group.
 379  *
 380  * Since: 2.30
 381  **/
 382 void
 383 g_simple_action_group_add_entries (GSimpleActionGroup *simple,
 384                                    const GActionEntry *entries,
 385                                    gint                n_entries,
 386                                    gpointer            user_data)
 387 {
 388   g_action_map_add_action_entries (G_ACTION_MAP (simple), entries, n_entries, user_data);
 389 }