/* GIO - GLib Input, Output and Streaming Library * * Copyright (C) 2006-2007 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General * Public License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * * Author: Alexander Larsson */ #include "config.h" #include "gasyncresult.h" #include "gsimpleasyncresult.h" #include "gicon.h" #include "gloadableicon.h" #include "glibintl.h" /** * SECTION:gloadableicon * @short_description: Loadable Icons * @include: gio/gio.h * @see_also: #GIcon, #GThemedIcon * * Extends the #GIcon interface and adds the ability to * load icons from streams. **/ static void g_loadable_icon_real_load_async (GLoadableIcon *icon, int size, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data); static GInputStream *g_loadable_icon_real_load_finish (GLoadableIcon *icon, GAsyncResult *res, char **type, GError **error); typedef GLoadableIconIface GLoadableIconInterface; G_DEFINE_INTERFACE(GLoadableIcon, g_loadable_icon, G_TYPE_ICON) static void g_loadable_icon_default_init (GLoadableIconIface *iface) { iface->load_async = g_loadable_icon_real_load_async; iface->load_finish = g_loadable_icon_real_load_finish; } /** * g_loadable_icon_load: * @icon: a #GLoadableIcon. * @size: an integer. * @type: a location to store the type of the loaded icon, %NULL to ignore. * @cancellable: optional #GCancellable object, %NULL to ignore. * @error: a #GError location to store the error occuring, or %NULL to * ignore. * * Loads a loadable icon. For the asynchronous version of this function, * see g_loadable_icon_load_async(). * * Returns: a #GInputStream to read the icon from. **/ GInputStream * g_loadable_icon_load (GLoadableIcon *icon, int size, char **type, GCancellable *cancellable, GError **error) { GLoadableIconIface *iface; g_return_val_if_fail (G_IS_LOADABLE_ICON (icon), NULL); iface = G_LOADABLE_ICON_GET_IFACE (icon); return (* iface->load) (icon, size, type, cancellable, error); } /** * g_loadable_icon_load_async: * @icon: a #GLoadableIcon. * @size: an integer. * @cancellable: optional #GCancellable object, %NULL to ignore. * @callback: a #GAsyncReadyCallback to call when the request is satisfied * @user_data: the data to pass to callback function * * Loads an icon asynchronously. To finish this function, see * g_loadable_icon_load_finish(). For the synchronous, blocking * version of this function, see g_loadable_icon_load(). **/ void g_loadable_icon_load_async (GLoadableIcon *icon, int size, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GLoadableIconIface *iface; g_return_if_fail (G_IS_LOADABLE_ICON (icon)); iface = G_LOADABLE_ICON_GET_IFACE (icon); (* iface->load_async) (icon, size, cancellable, callback, user_data); } /** * g_loadable_icon_load_finish: * @icon: a #GLoadableIcon. * @res: a #GAsyncResult. * @type: a location to store the type of the loaded icon, %NULL to ignore. * @error: a #GError location to store the error occuring, or %NULL to * ignore. * * Finishes an asynchronous icon load started in g_loadable_icon_load_async(). * * Returns: a #GInputStream to read the icon from. **/ GInputStream * g_loadable_icon_load_finish (GLoadableIcon *icon, GAsyncResult *res, char **type, GError **error) { GLoadableIconIface *iface; g_return_val_if_fail (G_IS_LOADABLE_ICON (icon), NULL); g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL); if (G_IS_SIMPLE_ASYNC_RESULT (res)) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res); if (g_simple_async_result_propagate_error (simple, error)) return NULL; } iface = G_LOADABLE_ICON_GET_IFACE (icon); return (* iface->load_finish) (icon, res, type, error); } /******************************************** * Default implementation of async load * ********************************************/ typedef struct { int size; char *type; GInputStream *stream; } LoadData; static void load_data_free (LoadData *data) { if (data->stream) g_object_unref (data->stream); g_free (data->type); g_free (data); } static void load_async_thread (GSimpleAsyncResult *res, GObject *object, GCancellable *cancellable) { GLoadableIconIface *iface; GInputStream *stream; LoadData *data; GError *error = NULL; char *type = NULL; data = g_simple_async_result_get_op_res_gpointer (res); iface = G_LOADABLE_ICON_GET_IFACE (object); stream = iface->load (G_LOADABLE_ICON (object), data->size, &type, cancellable, &error); if (stream == NULL) { g_simple_async_result_set_from_error (res, error); g_error_free (error); } else { data->stream = stream; data->type = type; } } static void g_loadable_icon_real_load_async (GLoadableIcon *icon, int size, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GSimpleAsyncResult *res; LoadData *data; res = g_simple_async_result_new (G_OBJECT (icon), callback, user_data, g_loadable_icon_real_load_async); data = g_new0 (LoadData, 1); g_simple_async_result_set_op_res_gpointer (res, data, (GDestroyNotify) load_data_free); g_simple_async_result_run_in_thread (res, load_async_thread, 0, cancellable); g_object_unref (res); } static GInputStream * g_loadable_icon_real_load_finish (GLoadableIcon *icon, GAsyncResult *res, char **type, GError **error) { GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res); LoadData *data; g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_loadable_icon_real_load_async); data = g_simple_async_result_get_op_res_gpointer (simple); if (type) { *type = data->type; data->type = NULL; } return g_object_ref (data->stream); }