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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="id-1.5.3"></a>Migrating from GnomeVFS to GIO</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="ch33.html#id-1.5.3.3">Trash handling</a></span></dt>
<dt><span class="section"><a href="ch33s02.html">Operations on multiple files</a></span></dt>
<dt><span class="section"><a href="ch33s03.html">Mime monitoring</a></span></dt>
</dl></div>
<div class="table">
<a name="gnome-vfs-vs-gio"></a><p class="title"><b>Table 2. Comparison of GnomeVFS and GIO concepts</b></p>
<div class="table-contents"><table class="table" summary="Comparison of GnomeVFS and GIO concepts" border="1">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>GnomeVFS</th>
<th>GIO</th>
</tr></thead>
<tbody>
<tr>
<td>GnomeVFSURI</td>
<td>GFile</td>
</tr>
<tr>
<td>GnomeVFSFileInfo</td>
<td>GFileInfo</td>
</tr>
<tr>
<td>GnomeVFSResult</td>
<td>GError, with G_IO_ERROR values</td>
</tr>
<tr>
<td>GnomeVFSHandle & GnomeVFSAsyncHandle</td>
<td>GInputStream or GOutputStream</td>
</tr>
<tr>
<td>GnomeVFSDirectoryHandle</td>
<td>GFileEnumerator</td>
</tr>
<tr>
<td>mime type</td>
<td>content type</td>
</tr>
<tr>
<td>GnomeVFSMonitor</td>
<td>GFileMonitor</td>
</tr>
<tr>
<td>GnomeVFSVolumeMonitor</td>
<td>GVolumeMonitor</td>
</tr>
<tr>
<td>GnomeVFSVolume</td>
<td>GMount</td>
</tr>
<tr>
<td>GnomeVFSDrive</td>
<td>GVolume</td>
</tr>
<tr>
<td>-</td>
<td>GDrive</td>
</tr>
<tr>
<td>GnomeVFSContext</td>
<td>GCancellable</td>
</tr>
<tr>
<td>gnome_vfs_async_cancel</td>
<td>g_cancellable_cancel</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.5.3.3"></a>Trash handling</h2></div></div></div>
<p>
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 <a class="ulink" href="http://www.freedesktop.org/wiki/Specifications/trash-spec" target="_top">Desktop Trash Can</a> specification
that is implemented in GIO. The location for storing trashed files
has changed from <code class="filename">$HOME/.Trash</code> to
<code class="filename">$HOME/.local/share/Trash</code> (or more correctly
<code class="filename">$XDG_DATA_HOME/Trash</code>), which means that
there is a need for migrating files that have been trashed by
gnome-vfs to the new location.
</p>
<p>
In gnome-vfs, the <code class="filename">trash://</code> 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 <code class="filename">trash://</code>
implementation has been moved to gvfs and applications can simply
monitor that location:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
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34</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">file_changed</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GFileMonitor</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">file_monitor</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GFile</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">child</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GFile</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">other_file</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GFileMonitorEvent</span><span class="normal"> event_type</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> user_data</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="keyword">switch</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">event_type</span><span class="symbol">)</span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="keyword">case</span><span class="normal"> <a href="GFileMonitor.html#G-FILE-MONITOR-EVENT-DELETED:CAPS">G_FILE_MONITOR_EVENT_DELETED</a></span><span class="symbol">:</span>
<span class="normal"> </span><span class="function"><a href="../glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"'%s' removed from trash</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span><span class="normal"> </span><span class="function"><a href="GFile.html#g-file-get-basename">g_file_get_basename</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">child</span><span class="symbol">));</span>
<span class="normal"> </span><span class="keyword">break</span><span class="symbol">;</span>
<span class="normal"> </span><span class="keyword">case</span><span class="normal"> <a href="GFileMonitor.html#G-FILE-MONITOR-EVENT-CREATED:CAPS">G_FILE_MONITOR_EVENT_CREATED</a></span><span class="symbol">:</span>
<span class="normal"> </span><span class="function"><a href="../glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"'%s' added to trash</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span><span class="normal"> </span><span class="function"><a href="GFile.html#g-file-get-basename">g_file_get_basename</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">child</span><span class="symbol">));</span>
<span class="normal"> </span><span class="keyword">break</span><span class="symbol">;</span>
<span class="normal"> </span><span class="keyword">default</span><span class="symbol">:</span><span class="normal"> </span><span class="symbol">;</span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="cbracket">}</span>
<span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">start_monitoring_trash</span><span class="normal"> </span><span class="symbol">(</span><span class="type">void</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="usertype">GFile</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">file</span><span class="symbol">;</span>
<span class="normal"> </span><span class="usertype">GFileMonitor</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">monitor</span><span class="symbol">;</span>
<span class="normal"> file </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GFile.html#g-file-new-for-uri">g_file_new_for_uri</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"trash://"</span><span class="symbol">);</span>
<span class="normal"> monitor </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GFile.html#g-file-monitor-directory">g_file_monitor_directory</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">file</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> <a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> <a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="../gobject-The-Base-Object-Type.html#g-object-unref">g_object_unref</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">file</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="../gobject-Signals.html#g-signal-connect">g_signal_connect</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">monitor</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"changed"</span><span class="symbol">,</span><span class="normal"> </span><span class="function"><a href="../gobject-Closures.html#G-CALLBACK:CAPS">G_CALLBACK</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">file_changed</span><span class="symbol">),</span><span class="normal"> <a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="normal"> </span><span class="comment">/* ... */</span>
<span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
GIO exposes some useful metadata about trashed files. There are
trash::orig-path and trash::deletion-date attributes. The
standard::icon attribute of the <code class="filename">trash://</code>
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.
</p>
<p>
Moving a file to the trash is much simpler with GIO. Instead of
using <code class="function">gnome_vfs_find_directory()</code> with <code class="literal">GNOME_VFS_DIRECTORY_KIND_TRASH</code>
to find out where to move the trashed file, just use the <a class="link" href="GFile.html#g-file-trash" title="g_file_trash ()"><code class="function">g_file_trash()</code></a>
function.
</p>
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