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, 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
  25 #include "gfileicon.h"
  26 #include "gfile.h"
  27 #include "gicon.h"
  28 #include "glibintl.h"
  29 #include "gloadableicon.h"
  30 #include "ginputstream.h"
  31 #include "gsimpleasyncresult.h"
  32 #include "gioerror.h"
  33
  34
  35 /**
  36  * SECTION:gfileicon
  37  * @short_description: Icons pointing to an image file
  38  * @include: gio/gio.h
  39  * @see_also: #GIcon, #GLoadableIcon
  40  *
  41  * #GFileIcon specifies an icon by pointing to an image file
  42  * to be used as icon.
  43  *
  44  **/
  45
  46 static void g_file_icon_icon_iface_init          (GIconIface          *iface);
  47 static void g_file_icon_loadable_icon_iface_init (GLoadableIconIface  *iface);
  48 static void g_file_icon_load_async               (GLoadableIcon       *icon,
  49                                                   int                  size,
  50                                                   GCancellable        *cancellable,
  51                                                   GAsyncReadyCallback  callback,
  52                                                   gpointer             user_data);
  53
  54 struct _GFileIcon
  55 {
  56   GObject parent_instance;
  57
  58   GFile *file;
  59 };
  60
  61 struct _GFileIconClass
  62 {
  63   GObjectClass parent_class;
  64 };
  65
  66 enum
  67 {
  68   PROP_0,
  69   PROP_FILE
  70 };
  71
  72 G_DEFINE_TYPE_WITH_CODE (GFileIcon, g_file_icon, G_TYPE_OBJECT,
  73                          G_IMPLEMENT_INTERFACE (G_TYPE_ICON,
  74                                                 g_file_icon_icon_iface_init)
  75                          G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON,
  76                                                 g_file_icon_loadable_icon_iface_init))
  77
  78 static void
  79 g_file_icon_get_property (GObject    *object,
  80                           guint       prop_id,
  81                           GValue     *value,
  82                           GParamSpec *pspec)
  83 {
  84   GFileIcon *icon = G_FILE_ICON (object);
  85
  86   switch (prop_id)
  87     {
  88       case PROP_FILE:
  89         g_value_set_object (value, icon->file);
  90         break;
  91
  92       default:
  93         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
  94     }
  95 }
  96
  97 static void
  98 g_file_icon_set_property (GObject      *object,
  99                           guint         prop_id,
 100                           const GValue *value,
 101                           GParamSpec   *pspec)
 102 {
 103   GFileIcon *icon = G_FILE_ICON (object);
 104
 105   switch (prop_id)
 106     {
 107       case PROP_FILE:
 108         icon->file = G_FILE (g_value_dup_object (value));
 109         break;
 110
 111       default:
 112         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 113     }
 114 }
 115
 116 static void
 117 g_file_icon_finalize (GObject *object)
 118 {
 119   GFileIcon *icon;
 120
 121   icon = G_FILE_ICON (object);
 122
 123   g_object_unref (icon->file);
 124
 125   G_OBJECT_CLASS (g_file_icon_parent_class)->finalize (object);
 126 }
 127
 128 static void
 129 g_file_icon_class_init (GFileIconClass *klass)
 130 {
 131   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 132
 133   gobject_class->get_property = g_file_icon_get_property;
 134   gobject_class->set_property = g_file_icon_set_property;
 135   gobject_class->finalize = g_file_icon_finalize;
 136
 137   /**
 138    * GFileIcon:file:
 139    *
 140    * The file containing the icon.
 141    */
 142   g_object_class_install_property (gobject_class, PROP_FILE,
 143                                    g_param_spec_object ("file",
 144                                                         P_("file"),
 145                                                         P_("The file containing the icon"),
 146                                                         G_TYPE_FILE,
 147                                                         G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK));
 148 }
 149
 150 static void
 151 g_file_icon_init (GFileIcon *file)
 152 {
 153 }
 154
 155 /**
 156  * g_file_icon_new:
 157  * @file: a #GFile.
 158  *
 159  * Creates a new icon for a file.
 160  *
 161  * Returns: (transfer full): a #GIcon for the given @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 void
 259 g_file_icon_icon_iface_init (GIconIface *iface)
 260 {
 261   iface->hash = g_file_icon_hash;
 262   iface->equal = g_file_icon_equal;
 263   iface->to_tokens = g_file_icon_to_tokens;
 264   iface->from_tokens = g_file_icon_from_tokens;
 265 }
 266
 267
 268 static GInputStream *
 269 g_file_icon_load (GLoadableIcon  *icon,
 270                   int            size,
 271                   char          **type,
 272                   GCancellable   *cancellable,
 273                   GError        **error)
 274 {
 275   GFileInputStream *stream;
 276   GFileIcon *file_icon = G_FILE_ICON (icon);
 277
 278   stream = g_file_read (file_icon->file,
 279                         cancellable,
 280                         error);
 281
 282   return G_INPUT_STREAM (stream);
 283 }
 284
 285 typedef struct {
 286   GLoadableIcon *icon;
 287   GAsyncReadyCallback callback;
 288   gpointer user_data;
 289 } LoadData;
 290
 291 static void
 292 load_data_free (LoadData *data)
 293 {
 294   g_object_unref (data->icon);
 295   g_free (data);
 296 }
 297
 298 static void
 299 load_async_callback (GObject      *source_object,
 300                      GAsyncResult *res,
 301                      gpointer      user_data)
 302 {
 303   GFileInputStream *stream;
 304   GError *error = NULL;
 305   GSimpleAsyncResult *simple;
 306   LoadData *data = user_data;
 307
 308   stream = g_file_read_finish (G_FILE (source_object), res, &error);
 309
 310   if (stream == NULL)
 311     {
 312       simple = g_simple_async_result_new_take_error (G_OBJECT (data->icon),
 313                                                      data->callback,
 314                                                      data->user_data,
 315                                                      error);
 316     }
 317   else
 318     {
 319       simple = g_simple_async_result_new (G_OBJECT (data->icon),
 320                                           data->callback,
 321                                           data->user_data,
 322                                           g_file_icon_load_async);
 323
 324       g_simple_async_result_set_op_res_gpointer (simple,
 325                                                  stream,
 326                                                  g_object_unref);
 327   }
 328
 329
 330   g_simple_async_result_complete (simple);
 331
 332   load_data_free (data);
 333   g_object_unref (simple);
 334 }
 335
 336 static void
 337 g_file_icon_load_async (GLoadableIcon       *icon,
 338                         int                  size,
 339                         GCancellable        *cancellable,
 340                         GAsyncReadyCallback  callback,
 341                         gpointer             user_data)
 342 {
 343   GFileIcon *file_icon = G_FILE_ICON (icon);
 344   LoadData *data;
 345
 346   data = g_new0 (LoadData, 1);
 347   data->icon = g_object_ref (icon);
 348   data->callback = callback;
 349   data->user_data = user_data;
 350
 351   g_file_read_async (file_icon->file, 0,
 352                      cancellable,
 353                      load_async_callback, data);
 354
 355 }
 356
 357 static GInputStream *
 358 g_file_icon_load_finish (GLoadableIcon  *icon,
 359                          GAsyncResult   *res,
 360                          char          **type,
 361                          GError        **error)
 362 {
 363   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
 364   gpointer op;
 365
 366   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_file_icon_load_async);
 367
 368   if (type)
 369     *type = NULL;
 370
 371   op = g_simple_async_result_get_op_res_gpointer (simple);
 372   if (op)
 373     return g_object_ref (op);
 374
 375   return NULL;
 376 }
 377
 378 static void
 379 g_file_icon_loadable_icon_iface_init (GLoadableIconIface *iface)
 380 {
 381   iface->load = g_file_icon_load;
 382   iface->load_async = g_file_icon_load_async;
 383   iface->load_finish = g_file_icon_load_finish;
 384 }