gio/gicon.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24 #include "gicon.h"
  25
  26 #include "glibintl.h"
  27
  28 #include "gioalias.h"
  29
  30 /**
  31  * SECTION:gicon
  32  * @short_description: Interface for icons
  33  * @include: gio/gio.h
  34  *
  35  * #GIcon is a very minimal interface for icons. It provides functions
  36  * for checking the equality of two icons and hashing of icons.
  37  *
  38  * #GIcon does not provide the actual pixmap for the icon as this is out
  39  * of GIO's scope, however implementations of #GIcon may contain the name
  40  * of an icon (see #GThemedIcon), or the path to an icon (see #GLoadableIcon).
  41  *
  42  * To obtain a hash of a #GIcon, see g_icon_hash().
  43  *
  44  * To check if two #GIcons are equal, see g_icon_equal().
  45  **/
  46
  47 static void g_icon_base_init (gpointer g_class);
  48 static void g_icon_class_init (gpointer g_class,
  49                                gpointer class_data);
  50
  51 GType
  52 g_icon_get_type (void)
  53 {
  54   static volatile gsize g_define_type_id__volatile = 0;
  55
  56   if (g_once_init_enter (&g_define_type_id__volatile))
  57     {
  58       const GTypeInfo icon_info =
  59       {
  60         sizeof (GIconIface), /* class_size */
  61         g_icon_base_init,   /* base_init */
  62         NULL,           /* base_finalize */
  63         g_icon_class_init,
  64         NULL,           /* class_finalize */
  65         NULL,           /* class_data */
  66         0,
  67         0,              /* n_preallocs */
  68         NULL
  69       };
  70       GType g_define_type_id =
  71         g_type_register_static (G_TYPE_INTERFACE, I_("GIcon"),
  72                                 &icon_info, 0);
  73
  74       g_type_interface_add_prerequisite (g_define_type_id, G_TYPE_OBJECT);
  75
  76       g_once_init_leave (&g_define_type_id__volatile, g_define_type_id);
  77     }
  78
  79   return g_define_type_id__volatile;
  80 }
  81
  82 static void
  83 g_icon_class_init (gpointer g_class,
  84                    gpointer class_data)
  85 {
  86 }
  87
  88 static void
  89 g_icon_base_init (gpointer g_class)
  90 {
  91 }
  92
  93 /**
  94  * g_icon_hash:
  95  * @icon: #gconstpointer to an icon object.
  96  *
  97  * Gets a hash for an icon.
  98  *
  99  * Returns: a #guint containing a hash for the @icon, suitable for
 100  * use in a #GHashTable or similar data structure.
 101  **/
 102 guint
 103 g_icon_hash (gconstpointer icon)
 104 {
 105   GIconIface *iface;
 106
 107   g_return_val_if_fail (G_IS_ICON (icon), 0);
 108
 109   iface = G_ICON_GET_IFACE (icon);
 110
 111   return (* iface->hash) ((GIcon *)icon);
 112 }
 113
 114 /**
 115  * g_icon_equal:
 116  * @icon1: pointer to the first #GIcon.
 117  * @icon2: pointer to the second #GIcon.
 118  *
 119  * Checks if two icons are equal.
 120  *
 121  * Returns: %TRUE if @icon1 is equal to @icon2. %FALSE otherwise.
 122  **/
 123 gboolean
 124 g_icon_equal (GIcon *icon1,
 125               GIcon *icon2)
 126 {
 127   GIconIface *iface;
 128
 129   if (icon1 == NULL && icon2 == NULL)
 130     return TRUE;
 131
 132   if (icon1 == NULL || icon2 == NULL)
 133     return FALSE;
 134
 135   if (G_TYPE_FROM_INSTANCE (icon1) != G_TYPE_FROM_INSTANCE (icon2))
 136     return FALSE;
 137
 138   iface = G_ICON_GET_IFACE (icon1);
 139
 140   return (* iface->equal) (icon1, icon2);
 141 }
 142
 143 #define __G_ICON_C__
 144 #include "gioaliasdef.c"