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 "gloadableicon.h"
  29 #include "ginputstream.h"
  30 #include "gsimpleasyncresult.h"
  31
  32 #include "gioalias.h"
  33
  34 /**
  35  * SECTION:gfileicon
  36  * @short_description: Icons pointing to an image file
  37  * @include: gio/gio.h
  38  * @see_also: #GIcon, #GLoadableIcon
  39  *
  40  * #GFileIcon specifies an icon by pointing to an image file
  41  * to be used as icon.
  42  *
  43  **/
  44
  45 static void g_file_icon_icon_iface_init          (GIconIface          *iface);
  46 static void g_file_icon_loadable_icon_iface_init (GLoadableIconIface  *iface);
  47 static void g_file_icon_load_async               (GLoadableIcon       *icon,
  48                                                   int                  size,
  49                                                   GCancellable        *cancellable,
  50                                                   GAsyncReadyCallback  callback,
  51                                                   gpointer             user_data);
  52
  53 struct _GFileIcon
  54 {
  55   GObject parent_instance;
  56
  57   GFile *file;
  58 };
  59
  60 struct _GFileIconClass
  61 {
  62   GObjectClass parent_class;
  63 };
  64
  65 G_DEFINE_TYPE_WITH_CODE (GFileIcon, g_file_icon, G_TYPE_OBJECT,
  66                          G_IMPLEMENT_INTERFACE (G_TYPE_ICON,
  67                                                 g_file_icon_icon_iface_init)
  68                          G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON,
  69                                                 g_file_icon_loadable_icon_iface_init))
  70
  71 static void
  72 g_file_icon_finalize (GObject *object)
  73 {
  74   GFileIcon *icon;
  75
  76   icon = G_FILE_ICON (object);
  77
  78   g_object_unref (icon->file);
  79
  80   G_OBJECT_CLASS (g_file_icon_parent_class)->finalize (object);
  81 }
  82
  83 static void
  84 g_file_icon_class_init (GFileIconClass *klass)
  85 {
  86   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  87
  88   gobject_class->finalize = g_file_icon_finalize;
  89 }
  90
  91 static void
  92 g_file_icon_init (GFileIcon *file)
  93 {
  94 }
  95
  96 /**
  97  * g_file_icon_new:
  98  * @file: a #GFile.
  99  *
 100  * Creates a new icon for a file.
 101  *
 102  * Returns: a #GIcon for the given @file, or %NULL on error.
 103  **/
 104 GIcon *
 105 g_file_icon_new (GFile *file)
 106 {
 107   GFileIcon *icon;
 108
 109   g_return_val_if_fail (G_IS_FILE (file), NULL);
 110
 111   icon = g_object_new (G_TYPE_FILE_ICON, NULL);
 112   icon->file = g_object_ref (file);
 113
 114   return G_ICON (icon);
 115 }
 116
 117 /**
 118  * g_file_icon_get_file:
 119  * @icon: a #GIcon.
 120  *
 121  * Gets the #GFile associated with the given @icon.
 122  *
 123  * Returns: a #GFile, or %NULL.
 124  **/
 125 GFile *
 126 g_file_icon_get_file (GFileIcon *icon)
 127 {
 128   g_return_val_if_fail (G_IS_FILE_ICON (icon), NULL);
 129
 130   return icon->file;
 131 }
 132
 133 static guint
 134 g_file_icon_hash (GIcon *icon)
 135 {
 136   GFileIcon *file_icon = G_FILE_ICON (icon);
 137
 138   return g_file_hash (file_icon->file);
 139 }
 140
 141 static gboolean
 142 g_file_icon_equal (GIcon *icon1,
 143                    GIcon *icon2)
 144 {
 145   GFileIcon *file1 = G_FILE_ICON (icon1);
 146   GFileIcon *file2 = G_FILE_ICON (icon2);
 147
 148   return g_file_equal (file1->file, file2->file);
 149 }
 150
 151
 152 static void
 153 g_file_icon_icon_iface_init (GIconIface *iface)
 154 {
 155   iface->hash = g_file_icon_hash;
 156   iface->equal = g_file_icon_equal;
 157 }
 158
 159
 160 static GInputStream *
 161 g_file_icon_load (GLoadableIcon  *icon,
 162                   int            size,
 163                   char          **type,
 164                   GCancellable   *cancellable,
 165                   GError        **error)
 166 {
 167   GFileInputStream *stream;
 168   GFileIcon *file_icon = G_FILE_ICON (icon);
 169
 170   stream = g_file_read (file_icon->file,
 171                         cancellable,
 172                         error);
 173
 174   return G_INPUT_STREAM (stream);
 175 }
 176
 177 typedef struct {
 178   GLoadableIcon *icon;
 179   GAsyncReadyCallback callback;
 180   gpointer user_data;
 181 } LoadData;
 182
 183 static void
 184 load_data_free (LoadData *data)
 185 {
 186   g_object_unref (data->icon);
 187   g_free (data);
 188 }
 189
 190 static void
 191 load_async_callback (GObject      *source_object,
 192                      GAsyncResult *res,
 193                      gpointer      user_data)
 194 {
 195   GFileInputStream *stream;
 196   GError *error = NULL;
 197   GSimpleAsyncResult *simple;
 198   LoadData *data = user_data;
 199
 200   stream = g_file_read_finish (G_FILE (source_object), res, &error);
 201
 202   if (stream == NULL)
 203     {
 204       simple = g_simple_async_result_new_from_error (G_OBJECT (data->icon),
 205                                                      data->callback,
 206                                                      data->user_data,
 207                                                      error);
 208       g_error_free (error);
 209     }
 210   else
 211     {
 212       simple = g_simple_async_result_new (G_OBJECT (data->icon),
 213                                           data->callback,
 214                                           data->user_data,
 215                                           g_file_icon_load_async);
 216
 217       g_simple_async_result_set_op_res_gpointer (simple,
 218                                                  stream,
 219                                                  g_object_unref);
 220   }
 221
 222
 223   g_simple_async_result_complete (simple);
 224
 225   load_data_free (data);
 226 }
 227
 228 static void
 229 g_file_icon_load_async (GLoadableIcon       *icon,
 230                         int                  size,
 231                         GCancellable        *cancellable,
 232                         GAsyncReadyCallback  callback,
 233                         gpointer             user_data)
 234 {
 235   GFileIcon *file_icon = G_FILE_ICON (icon);
 236   LoadData *data;
 237
 238   data = g_new0 (LoadData, 1);
 239   data->icon = g_object_ref (icon);
 240   data->callback = callback;
 241   data->user_data = user_data;
 242
 243   g_file_read_async (file_icon->file, 0,
 244                      cancellable,
 245                      load_async_callback, data);
 246
 247 }
 248
 249 static GInputStream *
 250 g_file_icon_load_finish (GLoadableIcon  *icon,
 251                          GAsyncResult   *res,
 252                          char          **type,
 253                          GError        **error)
 254 {
 255   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
 256   gpointer op;
 257
 258   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_file_icon_load_async);
 259
 260   if (type)
 261     *type = NULL;
 262
 263   op = g_simple_async_result_get_op_res_gpointer (simple);
 264   if (op)
 265     return g_object_ref (op);
 266
 267   return NULL;
 268 }
 269
 270 static void
 271 g_file_icon_loadable_icon_iface_init (GLoadableIconIface *iface)
 272 {
 273   iface->load = g_file_icon_load;
 274   iface->load_async = g_file_icon_load_async;
 275   iface->load_finish = g_file_icon_load_finish;
 276 }
 277
 278 #define __G_FILE_ICON_C__
 279 #include "gioaliasdef.c"