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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 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |
| 7 |
| 8 |
| 9 |
| 10 |
| 11 |
| 12 |
| 13 |
| 14 |
| 15 |
| 16 |
| 17 |
| 18 |
| 19 |
| 20 |
| 21 |
| 22 |
| 23 |
| 24 |
| 25 |
| 26 |
| 27 |
| 28 |
| 29 |
| 30 |
| 31 |
| 32 |
| 33 |
| 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> |
| </div> |
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