mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2025-10-31 08:22:16 +01:00
110 lines
4.1 KiB
Markdown
110 lines
4.1 KiB
Markdown
|
Title: Migrating from GnomeVFS to GIO
|
||
|
|
SPDX-License-Identifier: LGPL-2.1-or-later
|
||
|
|
SPDX-FileCopyrightText: 2010 Matthias Clasen
|
||
|
|
|
||
|
|
# Migrating from GnomeVFS to GIO
|
||
|
|
|
||
|
|
## Comparison of GnomeVFS and GIO concepts
|
||
|
|
|
||
|
|
| GnomeVFS | GIO |
|
||
|
|
|----------|-----|
|
||
|
|
| `GnomeVFSURI` | [iface@Gio.File] |
|
||
|
|
| `GnomeVFSFileInfo` | [class@Gio.FileInfo] |
|
||
|
|
| `GnomeVFSResult` | [struct@GLib.Error], with `G_IO_ERROR` values |
|
||
|
|
| `GnomeVFSHandle` & `GnomeVFSAsyncHandle` | [class@Gio.InputStream] or [class@Gio.OutputStream] |
|
||
|
|
| `GnomeVFSDirectoryHandle` | [class@Gio.FileEnumerator] |
|
||
|
|
| MIME type | content type |
|
||
|
|
| `GnomeVFSMonitor` | [class@Gio.FileMonitor] |
|
||
|
|
| `GnomeVFSVolumeMonitor` | [class@Gio.VolumeMonitor] |
|
||
|
|
| `GnomeVFSVolume` | [iface@Gio.Mount] |
|
||
|
|
| `GnomeVFSDrive` | [iface@Gio.Volume] |
|
||
|
|
| - | [iface@Gio.Drive] |
|
||
|
|
| `GnomeVFSContext` | [class@Gio.Cancellable] |
|
||
|
|
| `gnome_vfs_async_cancel()` | [method@Gio.Cancellable.cancel] |
|
||
|
|
|
||
|
|
## Trash handling
|
||
|
|
|
||
|
|
The handling of trashed files has been changed in GIO, compared to
|
||
|
|
gnome-vfs. gnome-vfs has a home-grown trash implementation that predates the
|
||
|
|
freedesktop.org [Desktop Trash
|
||
|
|
Can](http://www.freedesktop.org/wiki/Specifications/trash-spec)
|
||
|
|
specification that is implemented in GIO. The location for storing trashed
|
||
|
|
files has changed from `$HOME/.Trash` to `$HOME/.local/share/Trash` (or more
|
||
|
|
correctly `$XDG_DATA_HOME/Trash`), which means that there is a need for
|
||
|
|
migrating files that have been trashed by gnome-vfs to the new location.
|
||
|
|
|
||
|
|
In gnome-vfs, the `trash://` scheme offering a merged view of all trash
|
||
|
|
directories was implemented in Nautilus, and trash-handling applications had
|
||
|
|
to find and monitor all trash directories themselves. With GIO, the
|
||
|
|
`trash://` implementation has been moved to gvfs and applications can simply
|
||
|
|
monitor that location:
|
||
|
|
|
||
|
|
```c
|
||
|
|
static void
|
||
|
|
file_changed (GFileMonitor *file_monitor,
|
||
|
|
GFile *child,
|
||
|
|
GFile *other_file,
|
||
|
|
GFileMonitorEvent event_type,
|
||
|
|
gpointer user_data)
|
||
|
|
{
|
||
|
|
switch (event_type)
|
||
|
|
{
|
||
|
|
case G_FILE_MONITOR_EVENT_DELETED:
|
||
|
|
g_print ("'%s' removed from trash\n", g_file_get_basename (child));
|
||
|
|
break;
|
||
|
|
case G_FILE_MONITOR_EVENT_CREATED:
|
||
|
|
g_print ("'%s' added to trash\n", g_file_get_basename (child));
|
||
|
|
break;
|
||
|
|
default: ;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
start_monitoring_trash (void)
|
||
|
|
{
|
||
|
|
GFile *file;
|
||
|
|
GFileMonitor *monitor;
|
||
|
|
|
||
|
|
file = g_file_new_for_uri ("trash://");
|
||
|
|
monitor = g_file_monitor_directory (file, 0, NULL, NULL);
|
||
|
|
g_object_unref (file);
|
||
|
|
|
||
|
|
g_signal_connect (monitor, "changed", G_CALLBACK (file_changed), NULL);
|
||
|
|
|
||
|
|
/* ... */
|
||
|
|
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
GIO exposes some useful metadata about trashed files. There are
|
||
|
|
`trash::orig-path` and `trash::deletion-date` attributes. The
|
||
|
|
`standard::icon` attribute of the `trash://` itself provides a suitable icon
|
||
|
|
for displaying the trash can on the desktop. If you are using this icon,
|
||
|
|
make sure to monitor this attribute for changes, since the icon may be
|
||
|
|
updated to reflect that state of the trash can.
|
||
|
|
|
||
|
|
Moving a file to the trash is much simpler with GIO. Instead of using
|
||
|
|
`gnome_vfs_find_directory()` with `GNOME_VFS_DIRECTORY_KIND_TRASH` to find
|
||
|
|
out where to move the trashed file, just use the [`method@Gio.File.trash`]
|
||
|
|
method.
|
||
|
|
|
||
|
|
## Operations on multiple files
|
||
|
|
|
||
|
|
gnome-vfs has the dreaded `gnome_vfs_xfer_uri_list()` function which has
|
||
|
|
tons of options and offers the equivalent of `cp`, `mv`, `ln`, `mkdir` and
|
||
|
|
`rm` at the same time.
|
||
|
|
|
||
|
|
GIO offers a much simpler asynchronous task functionality instead, that lets
|
||
|
|
you schedule a function to be called in a separate thread, making sure that
|
||
|
|
updates are scheduled within the main context that created the task, so you
|
||
|
|
can update your user interface. See: [`class@Gio.Task`].
|
||
|
|
|
||
|
|
## Mime monitoring
|
||
|
|
|
||
|
|
gnome-vfs offered a way to monitor the association between mime types and
|
||
|
|
default handlers for changes, with the `GnomeVFSMIMEMonitor` object. GIO
|
||
|
|
does not offer a replacement for this functionality at this time, since we
|
||
|
|
have not found a compelling use case where `GnomeVFSMIMEMonitor` was used.
|
||
|
|
If you think you have such a use case, please [open an issue on the GLib
|
||
|
|
issue tracker](https://gitlab.gnome.org/GNOME/glib/issues/new).
|