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) (type GFileIcon): a #GIcon for the given
 162  *   @file, or %NULL on error.
 163  **/
 164 GIcon *
 165 g_file_icon_new (GFile *file)
 166 {
 167   g_return_val_if_fail (G_IS_FILE (file), NULL);
 168
 169   return G_ICON (g_object_new (G_TYPE_FILE_ICON, "file", file, NULL));
 170 }
 171
 172 /**
 173  * g_file_icon_get_file:
 174  * @icon: a #GIcon.
 175  *
 176  * Gets the #GFile associated with the given @icon.
 177  *
 178  * Returns: (transfer none): a #GFile, or %NULL.
 179  **/
 180 GFile *
 181 g_file_icon_get_file (GFileIcon *icon)
 182 {
 183   g_return_val_if_fail (G_IS_FILE_ICON (icon), NULL);
 184
 185   return icon->file;
 186 }
 187
 188 static guint
 189 g_file_icon_hash (GIcon *icon)
 190 {
 191   GFileIcon *file_icon = G_FILE_ICON (icon);
 192
 193   return g_file_hash (file_icon->file);
 194 }
 195
 196 static gboolean
 197 g_file_icon_equal (GIcon *icon1,
 198                    GIcon *icon2)
 199 {
 200   GFileIcon *file1 = G_FILE_ICON (icon1);
 201   GFileIcon *file2 = G_FILE_ICON (icon2);
 202
 203   return g_file_equal (file1->file, file2->file);
 204 }
 205
 206 static gboolean
 207 g_file_icon_to_tokens (GIcon *icon,
 208                        GPtrArray *tokens,
 209                        gint  *out_version)
 210 {
 211   GFileIcon *file_icon = G_FILE_ICON (icon);
 212
 213   g_return_val_if_fail (out_version != NULL, FALSE);
 214
 215   *out_version = 0;
 216
 217   g_ptr_array_add (tokens, g_file_get_uri (file_icon->file));
 218   return TRUE;
 219 }
 220
 221 static GIcon *
 222 g_file_icon_from_tokens (gchar  **tokens,
 223                          gint     num_tokens,
 224                          gint     version,
 225                          GError **error)
 226 {
 227   GIcon *icon;
 228   GFile *file;
 229
 230   icon = NULL;
 231
 232   if (version != 0)
 233     {
 234       g_set_error (error,
 235                    G_IO_ERROR,
 236                    G_IO_ERROR_INVALID_ARGUMENT,
 237                    _("Can't handle version %d of GFileIcon encoding"),
 238                    version);
 239       goto out;
 240     }
 241
 242   if (num_tokens != 1)
 243     {
 244       g_set_error_literal (error,
 245                            G_IO_ERROR,
 246                            G_IO_ERROR_INVALID_ARGUMENT,
 247                            _("Malformed input data for GFileIcon"));
 248       goto out;
 249     }
 250
 251   file = g_file_new_for_uri (tokens[0]);
 252   icon = g_file_icon_new (file);
 253   g_object_unref (file);
 254
 255  out:
 256   return icon;
 257 }
 258
 259 static void
 260 g_file_icon_icon_iface_init (GIconIface *iface)
 261 {
 262   iface->hash = g_file_icon_hash;
 263   iface->equal = g_file_icon_equal;
 264   iface->to_tokens = g_file_icon_to_tokens;
 265   iface->from_tokens = g_file_icon_from_tokens;
 266 }
 267
 268
 269 static GInputStream *
 270 g_file_icon_load (GLoadableIcon  *icon,
 271                   int            size,
 272                   char          **type,
 273                   GCancellable   *cancellable,
 274                   GError        **error)
 275 {
 276   GFileInputStream *stream;
 277   GFileIcon *file_icon = G_FILE_ICON (icon);
 278
 279   stream = g_file_read (file_icon->file,
 280                         cancellable,
 281                         error);
 282
 283   return G_INPUT_STREAM (stream);
 284 }
 285
 286 typedef struct {
 287   GLoadableIcon *icon;
 288   GAsyncReadyCallback callback;
 289   gpointer user_data;
 290 } LoadData;
 291
 292 static void
 293 load_data_free (LoadData *data)
 294 {
 295   g_object_unref (data->icon);
 296   g_free (data);
 297 }
 298
 299 static void
 300 load_async_callback (GObject      *source_object,
 301                      GAsyncResult *res,
 302                      gpointer      user_data)
 303 {
 304   GFileInputStream *stream;
 305   GError *error = NULL;
 306   GSimpleAsyncResult *simple;
 307   LoadData *data = user_data;
 308
 309   stream = g_file_read_finish (G_FILE (source_object), res, &error);
 310
 311   if (stream == NULL)
 312     {
 313       simple = g_simple_async_result_new_take_error (G_OBJECT (data->icon),
 314                                                      data->callback,
 315                                                      data->user_data,
 316                                                      error);
 317     }
 318   else
 319     {
 320       simple = g_simple_async_result_new (G_OBJECT (data->icon),
 321                                           data->callback,
 322                                           data->user_data,
 323                                           g_file_icon_load_async);
 324
 325       g_simple_async_result_set_op_res_gpointer (simple,
 326                                                  stream,
 327                                                  g_object_unref);
 328   }
 329
 330
 331   g_simple_async_result_complete (simple);
 332
 333   load_data_free (data);
 334   g_object_unref (simple);
 335 }
 336
 337 static void
 338 g_file_icon_load_async (GLoadableIcon       *icon,
 339                         int                  size,
 340                         GCancellable        *cancellable,
 341                         GAsyncReadyCallback  callback,
 342                         gpointer             user_data)
 343 {
 344   GFileIcon *file_icon = G_FILE_ICON (icon);
 345   LoadData *data;
 346
 347   data = g_new0 (LoadData, 1);
 348   data->icon = g_object_ref (icon);
 349   data->callback = callback;
 350   data->user_data = user_data;
 351
 352   g_file_read_async (file_icon->file, 0,
 353                      cancellable,
 354                      load_async_callback, data);
 355
 356 }
 357
 358 static GInputStream *
 359 g_file_icon_load_finish (GLoadableIcon  *icon,
 360                          GAsyncResult   *res,
 361                          char          **type,
 362                          GError        **error)
 363 {
 364   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
 365   gpointer op;
 366
 367   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_file_icon_load_async);
 368
 369   if (type)
 370     *type = NULL;
 371
 372   op = g_simple_async_result_get_op_res_gpointer (simple);
 373   if (op)
 374     return g_object_ref (op);
 375
 376   return NULL;
 377 }
 378
 379 static void
 380 g_file_icon_loadable_icon_iface_init (GLoadableIconIface *iface)
 381 {
 382   iface->load = g_file_icon_load;
 383   iface->load_async = g_file_icon_load_async;
 384   iface->load_finish = g_file_icon_load_finish;
 385 }