1 /* GIO - GLib Input, Output and Streaming Library
3 * Copyright (C) 2006-2007 Red Hat, Inc.
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.
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.
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.
20 * Author: Alexander Larsson <alexl@redhat.com>
24 #include "gasyncresult.h"
25 #include "gsimpleasyncresult.h"
27 #include "gloadableicon.h"
33 * SECTION:gloadableicon
34 * @short_description: Loadable Icons
36 * @see_also: #GIcon, #GThemedIcon
38 * Extends the #GIcon interface and adds the ability to
39 * load icons from streams.
42 static void g_loadable_icon_real_load_async (GLoadableIcon *icon,
44 GCancellable *cancellable,
45 GAsyncReadyCallback callback,
47 static GInputStream *g_loadable_icon_real_load_finish (GLoadableIcon *icon,
52 typedef GLoadableIconIface GLoadableIconInterface;
53 G_DEFINE_INTERFACE(GLoadableIcon, g_loadable_icon, G_TYPE_ICON)
56 g_loadable_icon_default_init (GLoadableIconIface *iface)
58 iface->load_async = g_loadable_icon_real_load_async;
59 iface->load_finish = g_loadable_icon_real_load_finish;
63 * g_loadable_icon_load:
64 * @icon: a #GLoadableIcon.
66 * @type: a location to store the type of the loaded icon, %NULL to ignore.
67 * @cancellable: optional #GCancellable object, %NULL to ignore.
68 * @error: a #GError location to store the error occuring, or %NULL to
71 * Loads a loadable icon. For the asynchronous version of this function,
72 * see g_loadable_icon_load_async().
74 * Returns: a #GInputStream to read the icon from.
77 g_loadable_icon_load (GLoadableIcon *icon,
80 GCancellable *cancellable,
83 GLoadableIconIface *iface;
85 g_return_val_if_fail (G_IS_LOADABLE_ICON (icon), NULL);
87 iface = G_LOADABLE_ICON_GET_IFACE (icon);
89 return (* iface->load) (icon, size, type, cancellable, error);
93 * g_loadable_icon_load_async:
94 * @icon: a #GLoadableIcon.
96 * @cancellable: optional #GCancellable object, %NULL to ignore.
97 * @callback: a #GAsyncReadyCallback to call when the request is satisfied
98 * @user_data: the data to pass to callback function
100 * Loads an icon asynchronously. To finish this function, see
101 * g_loadable_icon_load_finish(). For the synchronous, blocking
102 * version of this function, see g_loadable_icon_load().
105 g_loadable_icon_load_async (GLoadableIcon *icon,
107 GCancellable *cancellable,
108 GAsyncReadyCallback callback,
111 GLoadableIconIface *iface;
113 g_return_if_fail (G_IS_LOADABLE_ICON (icon));
115 iface = G_LOADABLE_ICON_GET_IFACE (icon);
117 (* iface->load_async) (icon, size, cancellable, callback, user_data);
121 * g_loadable_icon_load_finish:
122 * @icon: a #GLoadableIcon.
123 * @res: a #GAsyncResult.
124 * @type: a location to store the type of the loaded icon, %NULL to ignore.
125 * @error: a #GError location to store the error occuring, or %NULL to
128 * Finishes an asynchronous icon load started in g_loadable_icon_load_async().
130 * Returns: a #GInputStream to read the icon from.
133 g_loadable_icon_load_finish (GLoadableIcon *icon,
138 GLoadableIconIface *iface;
140 g_return_val_if_fail (G_IS_LOADABLE_ICON (icon), NULL);
141 g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
143 if (G_IS_SIMPLE_ASYNC_RESULT (res))
145 GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
146 if (g_simple_async_result_propagate_error (simple, error))
150 iface = G_LOADABLE_ICON_GET_IFACE (icon);
152 return (* iface->load_finish) (icon, res, type, error);
155 /********************************************
156 * Default implementation of async load *
157 ********************************************/
162 GInputStream *stream;
166 load_data_free (LoadData *data)
169 g_object_unref (data->stream);
175 load_async_thread (GSimpleAsyncResult *res,
177 GCancellable *cancellable)
179 GLoadableIconIface *iface;
180 GInputStream *stream;
182 GError *error = NULL;
185 data = g_simple_async_result_get_op_res_gpointer (res);
187 iface = G_LOADABLE_ICON_GET_IFACE (object);
188 stream = iface->load (G_LOADABLE_ICON (object), data->size, &type, cancellable, &error);
192 g_simple_async_result_set_from_error (res, error);
193 g_error_free (error);
197 data->stream = stream;
205 g_loadable_icon_real_load_async (GLoadableIcon *icon,
207 GCancellable *cancellable,
208 GAsyncReadyCallback callback,
211 GSimpleAsyncResult *res;
214 res = g_simple_async_result_new (G_OBJECT (icon), callback, user_data, g_loadable_icon_real_load_async);
215 data = g_new0 (LoadData, 1);
216 g_simple_async_result_set_op_res_gpointer (res, data, (GDestroyNotify) load_data_free);
217 g_simple_async_result_run_in_thread (res, load_async_thread, 0, cancellable);
218 g_object_unref (res);
221 static GInputStream *
222 g_loadable_icon_real_load_finish (GLoadableIcon *icon,
227 GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
230 g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_loadable_icon_real_load_async);
232 data = g_simple_async_result_get_op_res_gpointer (simple);
240 return g_object_ref (data->stream);
243 #define __G_LOADABLE_ICON_C__
244 #include "gioaliasdef.c"