gio/gemblem.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2008 Clemens N. Buss <cebuzz@gmail.com>
   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
  21 #include <config.h>
  22
  23 #include "gicon.h"
  24 #include "gemblem.h"
  25 #include "glibintl.h"
  26 #include "gioenums.h"
  27 #include "gioenumtypes.h"
  28 #include "gioerror.h"
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32
  33 /**
  34  * SECTION:gemblem
  35  * @short_description: An object for emblems
  36  * @include: gio/gio.h
  37  * @see_also: #GIcon, #GEmblemedIcon, #GLoadableIcon, #GThemedIcon
  38  *
  39  * #GEmblem is an implementation of #GIcon that supports
  40  * having an emblem, which is an icon with additional properties.
  41  * It can than be added to a #GEmblemedIcon.
  42  *
  43  * Currently, only metainformation about the emblem's origin is
  44  * supported. More may be added in the future.
  45  */
  46
  47 static void g_emblem_iface_init (GIconIface *iface);
  48
  49 struct _GEmblem
  50 {
  51   GObject parent_instance;
  52
  53   GIcon *icon;
  54   GEmblemOrigin origin;
  55 };
  56
  57 struct _GEmblemClass
  58 {
  59   GObjectClass parent_class;
  60 };
  61
  62 enum
  63 {
  64   PROP_0_GEMBLEM,
  65   PROP_ICON,
  66   PROP_ORIGIN
  67 };
  68
  69 G_DEFINE_TYPE_WITH_CODE (GEmblem, g_emblem, G_TYPE_OBJECT,
  70                          G_IMPLEMENT_INTERFACE (G_TYPE_ICON, g_emblem_iface_init))
  71
  72 static void
  73 g_emblem_get_property (GObject    *object,
  74                        guint       prop_id,
  75                        GValue     *value,
  76                        GParamSpec *pspec)
  77 {
  78   GEmblem *emblem = G_EMBLEM (object);
  79
  80   switch (prop_id)
  81     {
  82       case PROP_ICON:
  83         g_value_set_object (value, emblem->icon);
  84         break;
  85
  86       case PROP_ORIGIN:
  87         g_value_set_enum (value, emblem->origin);
  88         break;
  89
  90       default:
  91         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  92         break;
  93   }
  94 }
  95
  96 static void
  97 g_emblem_set_property (GObject      *object,
  98                        guint         prop_id,
  99                        const GValue *value,
 100                        GParamSpec   *pspec)
 101 {
 102   GEmblem *emblem = G_EMBLEM (object);
 103
 104   switch (prop_id)
 105     {
 106       case PROP_ICON:
 107         emblem->icon = g_value_dup_object (value);
 108         break;
 109
 110       case PROP_ORIGIN:
 111         emblem->origin = g_value_get_enum (value);
 112         break;
 113
 114       default:
 115         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 116         break;
 117     }
 118 }
 119
 120 static void
 121 g_emblem_finalize (GObject *object)
 122 {
 123   GEmblem *emblem = G_EMBLEM (object);
 124
 125   g_object_unref (emblem->icon);
 126
 127   (*G_OBJECT_CLASS (g_emblem_parent_class)->finalize) (object);
 128 }
 129
 130 static void
 131 g_emblem_class_init (GEmblemClass *klass)
 132 {
 133   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 134
 135   gobject_class->finalize = g_emblem_finalize;
 136   gobject_class->set_property = g_emblem_set_property;
 137   gobject_class->get_property = g_emblem_get_property;
 138
 139   g_object_class_install_property (gobject_class,
 140                                    PROP_ORIGIN,
 141                                    g_param_spec_enum ("origin",
 142                                                       P_("GEmblem's origin"),
 143                                                       P_("Tells which origin the emblem is derived from"),
 144                                                       G_TYPE_EMBLEM_ORIGIN,
 145                                                       G_EMBLEM_ORIGIN_UNKNOWN,
 146                                                       G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 147
 148   g_object_class_install_property (gobject_class,
 149                                    PROP_ICON,
 150                                    g_param_spec_object ("icon",
 151                                                       P_("The icon of the emblem"),
 152                                                       P_("The actual icon of the emblem"),
 153                                                       G_TYPE_OBJECT,
 154                                                       G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 155
 156 }
 157
 158 static void
 159 g_emblem_init (GEmblem *emblem)
 160 {
 161 }
 162
 163 /**
 164  * g_emblem_new:
 165  * @icon: a GIcon containing the icon.
 166  *
 167  * Creates a new emblem for @icon.
 168  *
 169  * Returns: a new #GEmblem.
 170  *
 171  * Since: 2.18
 172  */
 173 GEmblem *
 174 g_emblem_new (GIcon *icon)
 175 {
 176   GEmblem* emblem;
 177
 178   g_return_val_if_fail (icon != NULL, NULL);
 179   g_return_val_if_fail (G_IS_ICON (icon), NULL);
 180   g_return_val_if_fail (!G_IS_EMBLEM (icon), NULL);
 181
 182   emblem = g_object_new (G_TYPE_EMBLEM, NULL);
 183   emblem->icon = g_object_ref (icon);
 184   emblem->origin = G_EMBLEM_ORIGIN_UNKNOWN;
 185
 186   return emblem;
 187 }
 188
 189 /**
 190  * g_emblem_new_with_origin:
 191  * @icon: a GIcon containing the icon.
 192  * @origin: a GEmblemOrigin enum defining the emblem's origin
 193  *
 194  * Creates a new emblem for @icon.
 195  *
 196  * Returns: a new #GEmblem.
 197  *
 198  * Since: 2.18
 199  */
 200 GEmblem *
 201 g_emblem_new_with_origin (GIcon         *icon,
 202                           GEmblemOrigin  origin)
 203 {
 204   GEmblem* emblem;
 205
 206   g_return_val_if_fail (icon != NULL, NULL);
 207   g_return_val_if_fail (G_IS_ICON (icon), NULL);
 208   g_return_val_if_fail (!G_IS_EMBLEM (icon), NULL);
 209
 210   emblem = g_object_new (G_TYPE_EMBLEM, NULL);
 211   emblem->icon = g_object_ref (icon);
 212   emblem->origin = origin;
 213
 214   return emblem;
 215 }
 216
 217 /**
 218  * g_emblem_get_icon:
 219  * @emblem: a #GEmblem from which the icon should be extracted.
 220  *
 221  * Gives back the icon from @emblem.
 222  *
 223  * Returns: (transfer none): a #GIcon. The returned object belongs to
 224  *          the emblem and should not be modified or freed.
 225  *
 226  * Since: 2.18
 227  */
 228 GIcon *
 229 g_emblem_get_icon (GEmblem *emblem)
 230 {
 231   g_return_val_if_fail (G_IS_EMBLEM (emblem), NULL);
 232
 233   return emblem->icon;
 234 }
 235
 236
 237 /**
 238  * g_emblem_get_origin:
 239  * @emblem: a #GEmblem
 240  *
 241  * Gets the origin of the emblem.
 242  *
 243  * Returns: (transfer none): the origin of the emblem
 244  *
 245  * Since: 2.18
 246  */
 247 GEmblemOrigin
 248 g_emblem_get_origin (GEmblem *emblem)
 249 {
 250   g_return_val_if_fail (G_IS_EMBLEM (emblem), G_EMBLEM_ORIGIN_UNKNOWN);
 251
 252   return emblem->origin;
 253 }
 254
 255 static guint
 256 g_emblem_hash (GIcon *icon)
 257 {
 258   GEmblem *emblem = G_EMBLEM (icon);
 259   guint hash;
 260
 261   hash  = g_icon_hash (g_emblem_get_icon (emblem));
 262   hash ^= emblem->origin;
 263
 264   return hash;
 265 }
 266
 267 static gboolean
 268 g_emblem_equal (GIcon *icon1,
 269                 GIcon *icon2)
 270 {
 271   GEmblem *emblem1 = G_EMBLEM (icon1);
 272   GEmblem *emblem2 = G_EMBLEM (icon2);
 273
 274   return emblem1->origin == emblem2->origin &&
 275          g_icon_equal (emblem1->icon, emblem2->icon);
 276 }
 277
 278 static gboolean
 279 g_emblem_to_tokens (GIcon *icon,
 280                     GPtrArray *tokens,
 281                     gint  *out_version)
 282 {
 283   GEmblem *emblem = G_EMBLEM (icon);
 284   char *s;
 285
 286   /* GEmblem are encoded as
 287    *
 288    * <origin> <icon>
 289    */
 290
 291   g_return_val_if_fail (out_version != NULL, FALSE);
 292
 293   *out_version = 0;
 294
 295   s = g_icon_to_string (emblem->icon);
 296   if (s == NULL)
 297     return FALSE;
 298
 299   g_ptr_array_add (tokens, s);
 300
 301   s = g_strdup_printf ("%d", emblem->origin);
 302   g_ptr_array_add (tokens, s);
 303
 304   return TRUE;
 305 }
 306
 307 static GIcon *
 308 g_emblem_from_tokens (gchar  **tokens,
 309                       gint     num_tokens,
 310                       gint     version,
 311                       GError **error)
 312 {
 313   GEmblem *emblem;
 314   GIcon *icon;
 315   GEmblemOrigin origin;
 316
 317   emblem = NULL;
 318
 319   if (version != 0)
 320     {
 321       g_set_error (error,
 322                    G_IO_ERROR,
 323                    G_IO_ERROR_INVALID_ARGUMENT,
 324                    _("Can't handle version %d of GEmblem encoding"),
 325                    version);
 326       return NULL;
 327     }
 328
 329   if (num_tokens != 2)
 330     {
 331       g_set_error (error,
 332                    G_IO_ERROR,
 333                    G_IO_ERROR_INVALID_ARGUMENT,
 334                    _("Malformed number of tokens (%d) in GEmblem encoding"),
 335                    num_tokens);
 336       return NULL;
 337     }
 338
 339   icon = g_icon_new_for_string (tokens[0], error);
 340
 341   if (icon == NULL)
 342     return NULL;
 343
 344   origin = atoi (tokens[1]);
 345
 346   emblem = g_emblem_new_with_origin (icon, origin);
 347   g_object_unref (icon);
 348
 349   return G_ICON (emblem);
 350 }
 351
 352 static void
 353 g_emblem_iface_init (GIconIface *iface)
 354 {
 355   iface->hash  = g_emblem_hash;
 356   iface->equal = g_emblem_equal;
 357   iface->to_tokens = g_emblem_to_tokens;
 358   iface->from_tokens = g_emblem_from_tokens;
 359 }