glib/gio/gvfs.h
Ryan Lortie c16f914b40 GIcon: add g_icon_[de]serialize()
Add support for serialising a GIcon to a GVariant and deserialising the
result back to a GIcon.

This solves a number of problems suffered by the existing to_string()
API, primarily these:

 - not forcing the icon to be a utf8 string means that we can
   efficiently encode a PNG (ie: just give the array of bytes)

 - there is no need to ensure that proper types are loaded before using
   the deserialisation interface.  'Foreign' icon types will probably
   emit a serialised format the deserialises to a GBytesIcon.

We additionally clearly document what is required for being a consumer
or implementation of #GIcon.

Further patches will be required to GdkPixbuf and GVfsIcon to bring
their implementations in line with the new rules (essentially: introduce
implementations of the new serialize() API).

https://bugzilla.gnome.org/show_bug.cgi?id=688820
2013-04-21 16:31:14 -04:00

135 lines
4.9 KiB
C

/* 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>
*/
#ifndef __G_VFS_H__
#define __G_VFS_H__
#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
#error "Only <gio/gio.h> can be included directly."
#endif
#include <gio/giotypes.h>
G_BEGIN_DECLS
#define G_TYPE_VFS (g_vfs_get_type ())
#define G_VFS(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_VFS, GVfs))
#define G_VFS_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_VFS, GVfsClass))
#define G_VFS_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_VFS, GVfsClass))
#define G_IS_VFS(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_VFS))
#define G_IS_VFS_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_VFS))
/**
* G_VFS_EXTENSION_POINT_NAME:
*
* Extension point for #GVfs functionality.
* See <link linkend="extending-gio">Extending GIO</link>.
*/
#define G_VFS_EXTENSION_POINT_NAME "gio-vfs"
/**
* GVfs:
*
* Virtual File System object.
**/
typedef struct _GVfsClass GVfsClass;
struct _GVfs
{
GObject parent_instance;
};
struct _GVfsClass
{
GObjectClass parent_class;
/* Virtual Table */
gboolean (* is_active) (GVfs *vfs);
GFile * (* get_file_for_path) (GVfs *vfs,
const char *path);
GFile * (* get_file_for_uri) (GVfs *vfs,
const char *uri);
const gchar * const * (* get_supported_uri_schemes) (GVfs *vfs);
GFile * (* parse_name) (GVfs *vfs,
const char *parse_name);
/*< private >*/
void (* local_file_add_info) (GVfs *vfs,
const char *filename,
guint64 device,
GFileAttributeMatcher *attribute_matcher,
GFileInfo *info,
GCancellable *cancellable,
gpointer *extra_data,
GDestroyNotify *free_extra_data);
void (* add_writable_namespaces) (GVfs *vfs,
GFileAttributeInfoList *list);
gboolean (* local_file_set_attributes) (GVfs *vfs,
const char *filename,
GFileInfo *info,
GFileQueryInfoFlags flags,
GCancellable *cancellable,
GError **error);
void (* local_file_removed) (GVfs *vfs,
const char *filename);
void (* local_file_moved) (GVfs *vfs,
const char *source,
const char *dest);
GIcon * (* deserialize_icon) (GVfs *vfs,
GVariant *value);
/* Padding for future expansion */
void (*_g_reserved1) (void);
void (*_g_reserved2) (void);
void (*_g_reserved3) (void);
void (*_g_reserved4) (void);
void (*_g_reserved5) (void);
void (*_g_reserved6) (void);
};
GLIB_AVAILABLE_IN_ALL
GType g_vfs_get_type (void) G_GNUC_CONST;
GLIB_AVAILABLE_IN_ALL
gboolean g_vfs_is_active (GVfs *vfs);
GLIB_AVAILABLE_IN_ALL
GFile * g_vfs_get_file_for_path (GVfs *vfs,
const char *path);
GLIB_AVAILABLE_IN_ALL
GFile * g_vfs_get_file_for_uri (GVfs *vfs,
const char *uri);
GLIB_AVAILABLE_IN_ALL
const gchar* const * g_vfs_get_supported_uri_schemes (GVfs *vfs);
GLIB_AVAILABLE_IN_ALL
GFile * g_vfs_parse_name (GVfs *vfs,
const char *parse_name);
GLIB_AVAILABLE_IN_ALL
GVfs * g_vfs_get_default (void);
GLIB_AVAILABLE_IN_ALL
GVfs * g_vfs_get_local (void);
G_END_DECLS
#endif /* __G_VFS_H__ */