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