gio/gloadableicon.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 #include "gasyncresult.h"
  25 #include "gsimpleasyncresult.h"
  26 #include "gicon.h"
  27 #include "gloadableicon.h"
  28 #include "glibintl.h"
  29
  30 #include "gioalias.h"
  31
  32 /**
  33  * SECTION:gloadableicon
  34  * @short_description: Loadable Icons
  35  * @include: gio/gio.h
  36  * @see_also: #GIcon, #GThemedIcon
  37  *
  38  * Extends the #GIcon interface and adds the ability to
  39  * load icons from streams.
  40  **/
  41
  42 static void          g_loadable_icon_real_load_async  (GLoadableIcon        *icon,
  43                                                        int                   size,
  44                                                        GCancellable         *cancellable,
  45                                                        GAsyncReadyCallback   callback,
  46                                                        gpointer              user_data);
  47 static GInputStream *g_loadable_icon_real_load_finish (GLoadableIcon        *icon,
  48                                                        GAsyncResult         *res,
  49                                                        char                **type,
  50                                                        GError              **error);
  51 static void          g_loadable_icon_base_init        (gpointer              g_class);
  52 static void          g_loadable_icon_class_init       (gpointer              g_class,
  53                                                        gpointer              class_data);
  54
  55 GType
  56 g_loadable_icon_get_type (void)
  57 {
  58   static volatile gsize g_define_type_id__volatile = 0;
  59
  60   if (g_once_init_enter (&g_define_type_id__volatile))
  61     {
  62       const GTypeInfo loadable_icon_info =
  63         {
  64         sizeof (GLoadableIconIface), /* class_size */
  65         g_loadable_icon_base_init,   /* base_init */
  66         NULL,           /* base_finalize */
  67         g_loadable_icon_class_init,
  68         NULL,           /* class_finalize */
  69         NULL,           /* class_data */
  70         0,
  71         0,              /* n_preallocs */
  72         NULL
  73       };
  74       GType g_define_type_id =
  75         g_type_register_static (G_TYPE_INTERFACE, I_("GLoadableIcon"),
  76                                 &loadable_icon_info, 0);
  77
  78       g_type_interface_add_prerequisite (g_define_type_id, G_TYPE_ICON);
  79
  80       g_once_init_leave (&g_define_type_id__volatile, g_define_type_id);
  81     }
  82
  83   return g_define_type_id__volatile;
  84 }
  85
  86 static void
  87 g_loadable_icon_class_init (gpointer g_class,
  88                             gpointer class_data)
  89 {
  90   GLoadableIconIface *iface = g_class;
  91
  92   iface->load_async = g_loadable_icon_real_load_async;
  93   iface->load_finish = g_loadable_icon_real_load_finish;
  94 }
  95
  96 static void
  97 g_loadable_icon_base_init (gpointer g_class)
  98 {
  99 }
 100
 101 /**
 102  * g_loadable_icon_load:
 103  * @icon: a #GLoadableIcon.
 104  * @size: an integer.
 105  * @type:  a location to store the type of the loaded icon, %NULL to ignore.
 106  * @cancellable: optional #GCancellable object, %NULL to ignore.
 107  * @error: a #GError location to store the error occuring, or %NULL to
 108  * ignore.
 109  *
 110  * Loads a loadable icon. For the asynchronous version of this function,
 111  * see g_loadable_icon_load_async().
 112  *
 113  * Returns: a #GInputStream to read the icon from.
 114  **/
 115 GInputStream *
 116 g_loadable_icon_load (GLoadableIcon  *icon,
 117                       int             size,
 118                       char          **type,
 119                       GCancellable   *cancellable,
 120                       GError        **error)
 121 {
 122   GLoadableIconIface *iface;
 123
 124   g_return_val_if_fail (G_IS_LOADABLE_ICON (icon), NULL);
 125
 126   iface = G_LOADABLE_ICON_GET_IFACE (icon);
 127
 128   return (* iface->load) (icon, size, type, cancellable, error);
 129 }
 130
 131 /**
 132  * g_loadable_icon_load_async:
 133  * @icon: a #GLoadableIcon.
 134  * @size: an integer.
 135  * @cancellable: optional #GCancellable object, %NULL to ignore.
 136  * @callback: a #GAsyncReadyCallback to call when the request is satisfied
 137  * @user_data: the data to pass to callback function
 138  *
 139  * Loads an icon asynchronously. To finish this function, see
 140  * g_loadable_icon_load_finish(). For the synchronous, blocking
 141  * version of this function, see g_loadable_icon_load().
 142  **/
 143 void
 144 g_loadable_icon_load_async (GLoadableIcon       *icon,
 145                             int                  size,
 146                             GCancellable        *cancellable,
 147                             GAsyncReadyCallback  callback,
 148                             gpointer             user_data)
 149 {
 150   GLoadableIconIface *iface;
 151
 152   g_return_if_fail (G_IS_LOADABLE_ICON (icon));
 153
 154   iface = G_LOADABLE_ICON_GET_IFACE (icon);
 155
 156   (* iface->load_async) (icon, size, cancellable, callback, user_data);
 157 }
 158
 159 /**
 160  * g_loadable_icon_load_finish:
 161  * @icon: a #GLoadableIcon.
 162  * @res: a #GAsyncResult.
 163  * @type: a location to store the type of the loaded icon, %NULL to ignore.
 164  * @error: a #GError location to store the error occuring, or %NULL to
 165  * ignore.
 166  *
 167  * Finishes an asynchronous icon load started in g_loadable_icon_load_async().
 168  *
 169  * Returns: a #GInputStream to read the icon from.
 170  **/
 171 GInputStream *
 172 g_loadable_icon_load_finish (GLoadableIcon  *icon,
 173                              GAsyncResult   *res,
 174                              char          **type,
 175                              GError        **error)
 176 {
 177   GLoadableIconIface *iface;
 178
 179   g_return_val_if_fail (G_IS_LOADABLE_ICON (icon), NULL);
 180   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
 181
 182   if (G_IS_SIMPLE_ASYNC_RESULT (res))
 183     {
 184       GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
 185       if (g_simple_async_result_propagate_error (simple, error))
 186         return NULL;
 187     }
 188
 189   iface = G_LOADABLE_ICON_GET_IFACE (icon);
 190
 191   return (* iface->load_finish) (icon, res, type, error);
 192 }
 193
 194 /********************************************
 195  *   Default implementation of async load   *
 196  ********************************************/
 197
 198 typedef struct {
 199   int size;
 200   char *type;
 201   GInputStream *stream;
 202 } LoadData;
 203
 204 static void
 205 load_data_free (LoadData *data)
 206 {
 207   if (data->stream)
 208     g_object_unref (data->stream);
 209   g_free (data->type);
 210   g_free (data);
 211 }
 212
 213 static void
 214 load_async_thread (GSimpleAsyncResult *res,
 215                    GObject            *object,
 216                    GCancellable       *cancellable)
 217 {
 218   GLoadableIconIface *iface;
 219   GInputStream *stream;
 220   LoadData *data;
 221   GError *error = NULL;
 222   char *type = NULL;
 223
 224   data = g_simple_async_result_get_op_res_gpointer (res);
 225
 226   iface = G_LOADABLE_ICON_GET_IFACE (object);
 227   stream = iface->load (G_LOADABLE_ICON (object), data->size, &type, cancellable, &error);
 228
 229   if (stream == NULL)
 230     {
 231       g_simple_async_result_set_from_error (res, error);
 232       g_error_free (error);
 233     }
 234   else
 235     {
 236       data->stream = stream;
 237       data->type = type;
 238     }
 239 }
 240
 241
 242
 243 static void
 244 g_loadable_icon_real_load_async (GLoadableIcon       *icon,
 245                                  int                  size,
 246                                  GCancellable        *cancellable,
 247                                  GAsyncReadyCallback  callback,
 248                                  gpointer             user_data)
 249 {
 250   GSimpleAsyncResult *res;
 251   LoadData *data;
 252
 253   res = g_simple_async_result_new (G_OBJECT (icon), callback, user_data, g_loadable_icon_real_load_async);
 254   data = g_new0 (LoadData, 1);
 255   g_simple_async_result_set_op_res_gpointer (res, data, (GDestroyNotify) load_data_free);
 256   g_simple_async_result_run_in_thread (res, load_async_thread, 0, cancellable);
 257   g_object_unref (res);
 258 }
 259
 260 static GInputStream *
 261 g_loadable_icon_real_load_finish (GLoadableIcon        *icon,
 262                                   GAsyncResult         *res,
 263                                   char                **type,
 264                                   GError              **error)
 265 {
 266   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
 267   LoadData *data;
 268
 269   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_loadable_icon_real_load_async);
 270
 271   data = g_simple_async_result_get_op_res_gpointer (simple);
 272
 273   if (type)
 274     {
 275       *type = data->type;
 276       data->type = NULL;
 277     }
 278
 279   return g_object_ref (data->stream);
 280 }
 281
 282 #define __G_LOADABLE_ICON_C__
 283 #include "gioaliasdef.c"