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/* 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 <alexl@redhat.com>
*/
#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: (out) (allow-none): a location to store the type of the
* loaded icon, %NULL to ignore.
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @error: a #GError location to store the error occurring, or %NULL to
* ignore.
*
* Loads a loadable icon. For the asynchronous version of this function,
* see g_loadable_icon_load_async().
*
* Returns: (transfer full): 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: (allow-none): optional #GCancellable object, %NULL to ignore.
* @callback: (scope async): a #GAsyncReadyCallback to call when the
* request is satisfied
* @user_data: (closure): 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 occurring, or %NULL to
* ignore.
*
* Finishes an asynchronous icon load started in g_loadable_icon_load_async().
*
* Returns: (transfer full): 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_take_error (res, 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);
}
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