gio/gfileicon.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, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Alexander Larsson <alexl@redhat.com>
  19  */
  20
  21 #include "config.h"
  22
  23 #include "gfileicon.h"
  24 #include "gfile.h"
  25 #include "gicon.h"
  26 #include "glibintl.h"
  27 #include "gloadableicon.h"
  28 #include "ginputstream.h"
  29 #include "gtask.h"
  30 #include "gioerror.h"
  31
  32
  33 /**
  34  * SECTION:gfileicon
  35  * @short_description: Icons pointing to an image file
  36  * @include: gio/gio.h
  37  * @see_also: #GIcon, #GLoadableIcon
  38  *
  39  * #GFileIcon specifies an icon by pointing to an image file
  40  * to be used as icon.
  41  *
  42  **/
  43
  44 static void g_file_icon_icon_iface_init          (GIconIface          *iface);
  45 static void g_file_icon_loadable_icon_iface_init (GLoadableIconIface  *iface);
  46 static void g_file_icon_load_async               (GLoadableIcon       *icon,
  47                                                   int                  size,
  48                                                   GCancellable        *cancellable,
  49                                                   GAsyncReadyCallback  callback,
  50                                                   gpointer             user_data);
  51
  52 struct _GFileIcon
  53 {
  54   GObject parent_instance;
  55
  56   GFile *file;
  57 };
  58
  59 struct _GFileIconClass
  60 {
  61   GObjectClass parent_class;
  62 };
  63
  64 enum
  65 {
  66   PROP_0,
  67   PROP_FILE
  68 };
  69
  70 G_DEFINE_TYPE_WITH_CODE (GFileIcon, g_file_icon, G_TYPE_OBJECT,
  71                          G_IMPLEMENT_INTERFACE (G_TYPE_ICON,
  72                                                 g_file_icon_icon_iface_init)
  73                          G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON,
  74                                                 g_file_icon_loadable_icon_iface_init))
  75
  76 static void
  77 g_file_icon_get_property (GObject    *object,
  78                           guint       prop_id,
  79                           GValue     *value,
  80                           GParamSpec *pspec)
  81 {
  82   GFileIcon *icon = G_FILE_ICON (object);
  83
  84   switch (prop_id)
  85     {
  86       case PROP_FILE:
  87         g_value_set_object (value, icon->file);
  88         break;
  89
  90       default:
  91         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  92     }
  93 }
  94
  95 static void
  96 g_file_icon_set_property (GObject      *object,
  97                           guint         prop_id,
  98                           const GValue *value,
  99                           GParamSpec   *pspec)
 100 {
 101   GFileIcon *icon = G_FILE_ICON (object);
 102
 103   switch (prop_id)
 104     {
 105       case PROP_FILE:
 106         icon->file = G_FILE (g_value_dup_object (value));
 107         break;
 108
 109       default:
 110         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 111     }
 112 }
 113
 114 static void
 115 g_file_icon_finalize (GObject *object)
 116 {
 117   GFileIcon *icon;
 118
 119   icon = G_FILE_ICON (object);
 120
 121   if (icon->file)
 122     g_object_unref (icon->file);
 123
 124   G_OBJECT_CLASS (g_file_icon_parent_class)->finalize (object);
 125 }
 126
 127 static void
 128 g_file_icon_class_init (GFileIconClass *klass)
 129 {
 130   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 131
 132   gobject_class->get_property = g_file_icon_get_property;
 133   gobject_class->set_property = g_file_icon_set_property;
 134   gobject_class->finalize = g_file_icon_finalize;
 135
 136   /**
 137    * GFileIcon:file:
 138    *
 139    * The file containing the icon.
 140    */
 141   g_object_class_install_property (gobject_class, PROP_FILE,
 142                                    g_param_spec_object ("file",
 143                                                         P_("file"),
 144                                                         P_("The file containing the icon"),
 145                                                         G_TYPE_FILE,
 146                                                         G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK));
 147 }
 148
 149 static void
 150 g_file_icon_init (GFileIcon *file)
 151 {
 152 }
 153
 154 /**
 155  * g_file_icon_new:
 156  * @file: a #GFile.
 157  *
 158  * Creates a new icon for a file.
 159  *
 160  * Returns: (transfer full) (type GFileIcon): a #GIcon for the given
 161  *   @file, or %NULL on error.
 162  **/
 163 GIcon *
 164 g_file_icon_new (GFile *file)
 165 {
 166   g_return_val_if_fail (G_IS_FILE (file), NULL);
 167
 168   return G_ICON (g_object_new (G_TYPE_FILE_ICON, "file", file, NULL));
 169 }
 170
 171 /**
 172  * g_file_icon_get_file:
 173  * @icon: a #GIcon.
 174  *
 175  * Gets the #GFile associated with the given @icon.
 176  *
 177  * Returns: (transfer none): a #GFile, or %NULL.
 178  **/
 179 GFile *
 180 g_file_icon_get_file (GFileIcon *icon)
 181 {
 182   g_return_val_if_fail (G_IS_FILE_ICON (icon), NULL);
 183
 184   return icon->file;
 185 }
 186
 187 static guint
 188 g_file_icon_hash (GIcon *icon)
 189 {
 190   GFileIcon *file_icon = G_FILE_ICON (icon);
 191
 192   return g_file_hash (file_icon->file);
 193 }
 194
 195 static gboolean
 196 g_file_icon_equal (GIcon *icon1,
 197                    GIcon *icon2)
 198 {
 199   GFileIcon *file1 = G_FILE_ICON (icon1);
 200   GFileIcon *file2 = G_FILE_ICON (icon2);
 201
 202   return g_file_equal (file1->file, file2->file);
 203 }
 204
 205 static gboolean
 206 g_file_icon_to_tokens (GIcon *icon,
 207                        GPtrArray *tokens,
 208                        gint  *out_version)
 209 {
 210   GFileIcon *file_icon = G_FILE_ICON (icon);
 211
 212   g_return_val_if_fail (out_version != NULL, FALSE);
 213
 214   *out_version = 0;
 215
 216   g_ptr_array_add (tokens, g_file_get_uri (file_icon->file));
 217   return TRUE;
 218 }
 219
 220 static GIcon *
 221 g_file_icon_from_tokens (gchar  **tokens,
 222                          gint     num_tokens,
 223                          gint     version,
 224                          GError **error)
 225 {
 226   GIcon *icon;
 227   GFile *file;
 228
 229   icon = NULL;
 230
 231   if (version != 0)
 232     {
 233       g_set_error (error,
 234                    G_IO_ERROR,
 235                    G_IO_ERROR_INVALID_ARGUMENT,
 236                    _("Can’t handle version %d of GFileIcon encoding"),
 237                    version);
 238       goto out;
 239     }
 240
 241   if (num_tokens != 1)
 242     {
 243       g_set_error_literal (error,
 244                            G_IO_ERROR,
 245                            G_IO_ERROR_INVALID_ARGUMENT,
 246                            _("Malformed input data for GFileIcon"));
 247       goto out;
 248     }
 249
 250   file = g_file_new_for_uri (tokens[0]);
 251   icon = g_file_icon_new (file);
 252   g_object_unref (file);
 253
 254  out:
 255   return icon;
 256 }
 257
 258 static GVariant *
 259 g_file_icon_serialize (GIcon *icon)
 260 {
 261   GFileIcon *file_icon = G_FILE_ICON (icon);
 262
 263   return g_variant_new ("(sv)", "file", g_variant_new_take_string (g_file_get_uri (file_icon->file)));
 264 }
 265
 266 static void
 267 g_file_icon_icon_iface_init (GIconIface *iface)
 268 {
 269   iface->hash = g_file_icon_hash;
 270   iface->equal = g_file_icon_equal;
 271   iface->to_tokens = g_file_icon_to_tokens;
 272   iface->from_tokens = g_file_icon_from_tokens;
 273   iface->serialize = g_file_icon_serialize;
 274 }
 275
 276
 277 static GInputStream *
 278 g_file_icon_load (GLoadableIcon  *icon,
 279                   int            size,
 280                   char          **type,
 281                   GCancellable   *cancellable,
 282                   GError        **error)
 283 {
 284   GFileInputStream *stream;
 285   GFileIcon *file_icon = G_FILE_ICON (icon);
 286
 287   stream = g_file_read (file_icon->file,
 288                         cancellable,
 289                         error);
 290
 291   if (stream && type)
 292     *type = NULL;
 293
 294   return G_INPUT_STREAM (stream);
 295 }
 296
 297 static void
 298 load_async_callback (GObject      *source_object,
 299                      GAsyncResult *res,
 300                      gpointer      user_data)
 301 {
 302   GFileInputStream *stream;
 303   GError *error = NULL;
 304   GTask *task = user_data;
 305
 306   stream = g_file_read_finish (G_FILE (source_object), res, &error);
 307   if (stream == NULL)
 308     g_task_return_error (task, error);
 309   else
 310     g_task_return_pointer (task, stream, g_object_unref);
 311   g_object_unref (task);
 312 }
 313
 314 static void
 315 g_file_icon_load_async (GLoadableIcon       *icon,
 316                         int                  size,
 317                         GCancellable        *cancellable,
 318                         GAsyncReadyCallback  callback,
 319                         gpointer             user_data)
 320 {
 321   GFileIcon *file_icon = G_FILE_ICON (icon);
 322   GTask *task;
 323
 324   task = g_task_new (icon, cancellable, callback, user_data);
 325   g_task_set_source_tag (task, g_file_icon_load_async);
 326
 327   g_file_read_async (file_icon->file, 0,
 328                      cancellable,
 329                      load_async_callback, task);
 330 }
 331
 332 static GInputStream *
 333 g_file_icon_load_finish (GLoadableIcon  *icon,
 334                          GAsyncResult   *res,
 335                          char          **type,
 336                          GError        **error)
 337 {
 338   g_return_val_if_fail (g_task_is_valid (res, icon), NULL);
 339
 340   if (type)
 341     *type = NULL;
 342
 343   return g_task_propagate_pointer (G_TASK (res), error);
 344 }
 345
 346 static void
 347 g_file_icon_loadable_icon_iface_init (GLoadableIconIface *iface)
 348 {
 349   iface->load = g_file_icon_load;
 350   iface->load_async = g_file_icon_load_async;
 351   iface->load_finish = g_file_icon_load_finish;
 352 }