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   if (emblem->icon)
 126     g_object_unref (emblem->icon);
 127
 128   (*G_OBJECT_CLASS (g_emblem_parent_class)->finalize) (object);
 129 }
 130
 131 static void
 132 g_emblem_class_init (GEmblemClass *klass)
 133 {
 134   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 135
 136   gobject_class->finalize = g_emblem_finalize;
 137   gobject_class->set_property = g_emblem_set_property;
 138   gobject_class->get_property = g_emblem_get_property;
 139
 140   g_object_class_install_property (gobject_class,
 141                                    PROP_ORIGIN,
 142                                    g_param_spec_enum ("origin",
 143                                                       P_("GEmblem's origin"),
 144                                                       P_("Tells which origin the emblem is derived from"),
 145                                                       G_TYPE_EMBLEM_ORIGIN,
 146                                                       G_EMBLEM_ORIGIN_UNKNOWN,
 147                                                       G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 148
 149   g_object_class_install_property (gobject_class,
 150                                    PROP_ICON,
 151                                    g_param_spec_object ("icon",
 152                                                       P_("The icon of the emblem"),
 153                                                       P_("The actual icon of the emblem"),
 154                                                       G_TYPE_OBJECT,
 155                                                       G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 156
 157 }
 158
 159 static void
 160 g_emblem_init (GEmblem *emblem)
 161 {
 162 }
 163
 164 /**
 165  * g_emblem_new:
 166  * @icon: a GIcon containing the icon.
 167  *
 168  * Creates a new emblem for @icon.
 169  *
 170  * Returns: a new #GEmblem.
 171  *
 172  * Since: 2.18
 173  */
 174 GEmblem *
 175 g_emblem_new (GIcon *icon)
 176 {
 177   GEmblem* emblem;
 178
 179   g_return_val_if_fail (icon != NULL, NULL);
 180   g_return_val_if_fail (G_IS_ICON (icon), NULL);
 181   g_return_val_if_fail (!G_IS_EMBLEM (icon), NULL);
 182
 183   emblem = g_object_new (G_TYPE_EMBLEM, NULL);
 184   emblem->icon = g_object_ref (icon);
 185   emblem->origin = G_EMBLEM_ORIGIN_UNKNOWN;
 186
 187   return emblem;
 188 }
 189
 190 /**
 191  * g_emblem_new_with_origin:
 192  * @icon: a GIcon containing the icon.
 193  * @origin: a GEmblemOrigin enum defining the emblem's origin
 194  *
 195  * Creates a new emblem for @icon.
 196  *
 197  * Returns: a new #GEmblem.
 198  *
 199  * Since: 2.18
 200  */
 201 GEmblem *
 202 g_emblem_new_with_origin (GIcon         *icon,
 203                           GEmblemOrigin  origin)
 204 {
 205   GEmblem* emblem;
 206
 207   g_return_val_if_fail (icon != NULL, NULL);
 208   g_return_val_if_fail (G_IS_ICON (icon), NULL);
 209   g_return_val_if_fail (!G_IS_EMBLEM (icon), NULL);
 210
 211   emblem = g_object_new (G_TYPE_EMBLEM, NULL);
 212   emblem->icon = g_object_ref (icon);
 213   emblem->origin = origin;
 214
 215   return emblem;
 216 }
 217
 218 /**
 219  * g_emblem_get_icon:
 220  * @emblem: a #GEmblem from which the icon should be extracted.
 221  *
 222  * Gives back the icon from @emblem.
 223  *
 224  * Returns: (transfer none): a #GIcon. The returned object belongs to
 225  *          the emblem and should not be modified or freed.
 226  *
 227  * Since: 2.18
 228  */
 229 GIcon *
 230 g_emblem_get_icon (GEmblem *emblem)
 231 {
 232   g_return_val_if_fail (G_IS_EMBLEM (emblem), NULL);
 233
 234   return emblem->icon;
 235 }
 236
 237
 238 /**
 239  * g_emblem_get_origin:
 240  * @emblem: a #GEmblem
 241  *
 242  * Gets the origin of the emblem.
 243  *
 244  * Returns: (transfer none): the origin of the emblem
 245  *
 246  * Since: 2.18
 247  */
 248 GEmblemOrigin
 249 g_emblem_get_origin (GEmblem *emblem)
 250 {
 251   g_return_val_if_fail (G_IS_EMBLEM (emblem), G_EMBLEM_ORIGIN_UNKNOWN);
 252
 253   return emblem->origin;
 254 }
 255
 256 static guint
 257 g_emblem_hash (GIcon *icon)
 258 {
 259   GEmblem *emblem = G_EMBLEM (icon);
 260   guint hash;
 261
 262   hash  = g_icon_hash (g_emblem_get_icon (emblem));
 263   hash ^= emblem->origin;
 264
 265   return hash;
 266 }
 267
 268 static gboolean
 269 g_emblem_equal (GIcon *icon1,
 270                 GIcon *icon2)
 271 {
 272   GEmblem *emblem1 = G_EMBLEM (icon1);
 273   GEmblem *emblem2 = G_EMBLEM (icon2);
 274
 275   return emblem1->origin == emblem2->origin &&
 276          g_icon_equal (emblem1->icon, emblem2->icon);
 277 }
 278
 279 static gboolean
 280 g_emblem_to_tokens (GIcon *icon,
 281                     GPtrArray *tokens,
 282                     gint  *out_version)
 283 {
 284   GEmblem *emblem = G_EMBLEM (icon);
 285   char *s;
 286
 287   /* GEmblem are encoded as
 288    *
 289    * <origin> <icon>
 290    */
 291
 292   g_return_val_if_fail (out_version != NULL, FALSE);
 293
 294   *out_version = 0;
 295
 296   s = g_icon_to_string (emblem->icon);
 297   if (s == NULL)
 298     return FALSE;
 299
 300   g_ptr_array_add (tokens, s);
 301
 302   s = g_strdup_printf ("%d", emblem->origin);
 303   g_ptr_array_add (tokens, s);
 304
 305   return TRUE;
 306 }
 307
 308 static GIcon *
 309 g_emblem_from_tokens (gchar  **tokens,
 310                       gint     num_tokens,
 311                       gint     version,
 312                       GError **error)
 313 {
 314   GEmblem *emblem;
 315   GIcon *icon;
 316   GEmblemOrigin origin;
 317
 318   emblem = NULL;
 319
 320   if (version != 0)
 321     {
 322       g_set_error (error,
 323                    G_IO_ERROR,
 324                    G_IO_ERROR_INVALID_ARGUMENT,
 325                    _("Can't handle version %d of GEmblem encoding"),
 326                    version);
 327       return NULL;
 328     }
 329
 330   if (num_tokens != 2)
 331     {
 332       g_set_error (error,
 333                    G_IO_ERROR,
 334                    G_IO_ERROR_INVALID_ARGUMENT,
 335                    _("Malformed number of tokens (%d) in GEmblem encoding"),
 336                    num_tokens);
 337       return NULL;
 338     }
 339
 340   icon = g_icon_new_for_string (tokens[0], error);
 341
 342   if (icon == NULL)
 343     return NULL;
 344
 345   origin = atoi (tokens[1]);
 346
 347   emblem = g_emblem_new_with_origin (icon, origin);
 348   g_object_unref (icon);
 349
 350   return G_ICON (emblem);
 351 }
 352
 353 static GVariant *
 354 g_emblem_serialize (GIcon *icon)
 355 {
 356   GEmblem *emblem = G_EMBLEM (icon);
 357   GVariant *icon_data;
 358   GEnumValue *origin;
 359   GVariant *result;
 360
 361   icon_data = g_icon_serialize (emblem->icon);
 362   if (!icon_data)
 363     return NULL;
 364
 365   origin = g_enum_get_value (g_type_class_peek (G_TYPE_EMBLEM_ORIGIN), emblem->origin);
 366   result = g_variant_new_parsed ("('emblem', <(%v, {'origin': <%s>})>)",
 367                                  icon_data, origin ? origin->value_nick : "unknown");
 368   g_variant_unref (icon_data);
 369
 370   return result;
 371 }
 372
 373 static void
 374 g_emblem_iface_init (GIconIface *iface)
 375 {
 376   iface->hash  = g_emblem_hash;
 377   iface->equal = g_emblem_equal;
 378   iface->to_tokens = g_emblem_to_tokens;
 379   iface->from_tokens = g_emblem_from_tokens;
 380   iface->serialize = g_emblem_serialize;
 381 }