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