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