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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Migrating from EggRecent to GtkRecentChooser: GTK+ 2 Reference Manual</title>
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<div class="chapter">
<div class="titlepage"><div>
<div><h2 class="title">
<a name="gtk-migrating-GtkRecentChooser"></a>Migrating from EggRecent to GtkRecentChooser</h2></div>
<div><div class="author">
<h3 class="author"><span class="firstname">Emmanuele</span></h3>
<div class="affiliation"><div class="address"><p><br>
<code class="email"><<a class="email" href="mailto:ebassigmail.com">ebassi<em class="parameter"><code>gmail.com</code></em></a>></code><br>
</p></div></div>
</div></div>
</div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="gtk-migrating-GtkRecentChooser.html#gtkrecent-manager">Managing the Recently Used Documents</a></span></dt>
<dt><span class="section"><a href="gtkrecent-chooser.html">Displaying the Recently Used Documents</a></span></dt>
<dt><span class="section"><a href="gtkrecent-advanced.html">Advanced usage</a></span></dt>
</dl></div>
<p>
Since version 2.10, GTK+ provides a way of handling the recently used
documents. It is similar to the code that has lived inside the libegg
library and has been incorporated by many applications. The GTK+ version
aims to completely replace that code, and offers many distinctive features
that improve the registration and visualization of the recently used
documents, such as:
</p>
<p>
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
Better performances while reading and writing the list of recently used
files
</p></li>
<li class="listitem"><p>
More meta-data available for each recent document, like the
applications that have registered a document inside the list, the last
time and the number of times the same application did register a
document inside the list, an optional user readable name and
description of the document
</p></li>
<li class="listitem"><p>
Improved the ability to sort and filter the documents, also using
custom sorting and filtering functions
</p></li>
<li class="listitem"><p>
New widgets for displaying the list, and better integration with
current <a class="link" href="GtkFileChooser.html" title="GtkFileChooser"><span class="type">GtkFileChooser</span></a> and <a class="link" href="GtkUIManager.html" title="GtkUIManager"><span class="type">GtkUIManager</span></a> widgets
</p></li>
</ul></div>
<p>
</p>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="gtkrecent-manager"></a>Managing the Recently Used Documents</h2></div></div></div>
<p>
<a class="link" href="GtkRecentManager.html" title="GtkRecentManager"><span class="type">GtkRecentManager</span></a> is used to manage the Recently Used Documents. To
create a new <a class="link" href="GtkRecentManager.html" title="GtkRecentManager"><span class="type">GtkRecentManager</span></a>, you simply call <a class="link" href="GtkRecentManager.html#gtk-recent-manager-new" title="gtk_recent_manager_new ()"><code class="function">gtk_recent_manager_new()</code></a>.
Like the <span class="structname">EggRecentModel</span> inside EggRecent, the
<a class="link" href="GtkRecentManager.html" title="GtkRecentManager"><span class="type">GtkRecentManager</span></a> loads the list of the recent documents and notifies
you of changes inside the list.
</p>
<p>
Usually, instead of creating a new <a class="link" href="GtkRecentManager.html" title="GtkRecentManager"><span class="type">GtkRecentManager</span></a> each time you
need it, you'll want to use the <a class="link" href="GtkRecentManager.html#gtk-recent-manager-get-default" title="gtk_recent_manager_get_default ()"><code class="function">gtk_recent_manager_get_default()</code></a>
function.
</p>
<p>
To add a document to the list, you can use <a class="link" href="GtkRecentManager.html#gtk-recent-manager-add-item" title="gtk_recent_manager_add_item ()"><code class="function">gtk_recent_manager_add_item()</code></a>,
like:
</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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10</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">GtkRecentManager</span> <span class="o">*</span><span class="n">manager</span><span class="p">;</span>
<span class="n">manager</span> <span class="o">=</span> <span class="n">gtk_recent_manager_new</span> <span class="p">();</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">gtk_recent_manager_add_item</span> <span class="p">(</span><span class="n">manager</span><span class="p">,</span> <span class="n">document_uri</span><span class="p">))</span>
<span class="p">{</span>
<span class="cm">/* warn about the error */</span>
<span class="p">}</span>
<span class="n">g_object_unref</span> <span class="p">(</span><span class="n">manager</span><span class="p">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
The <a class="link" href="GtkRecentManager.html#gtk-recent-manager-add-item" title="gtk_recent_manager_add_item ()"><code class="function">gtk_recent_manager_add_item()</code></a> function will try and guess some of the
meta-data associated to a URI. If you know some of meta-data about the
document yourself, set the desired fields of a <a class="link" href="GtkRecentManager.html#GtkRecentData" title="struct GtkRecentData"><span class="type">GtkRecentData</span></a> structure
and pass it to the <a class="link" href="GtkRecentManager.html#gtk-recent-manager-add-full" title="gtk_recent_manager_add_full ()"><code class="function">gtk_recent_manager_add_full()</code></a> function instead:
</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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<td class="listing_code"><pre class="programlisting"><span class="n">GtkRecentManager</span> <span class="o">*</span><span class="n">manager</span><span class="p">;</span>
<span class="n">GtkRecentData</span> <span class="o">*</span><span class="n">recent_data</span><span class="p">;</span>
<span class="n">manager</span> <span class="o">=</span> <span class="n">gtk_recent_manager_new</span> <span class="p">();</span>
<span class="n">recent_data</span> <span class="o">=</span> <span class="n">g_new0</span> <span class="p">(</span><span class="n">GtkRecentData</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span>
<span class="cm">/* the user visible name of the document (maybe its title); should</span>
<span class="cm"> * be preferred when displaying the item into the list</span>
<span class="cm"> */</span>
<span class="n">recent_data</span><span class="o">-></span><span class="n">display_name</span> <span class="o">=</span> <span class="n">document_name</span><span class="p">;</span>
<span class="cm">/* the MIME type is mandatory */</span>
<span class="n">recent_data</span><span class="o">-></span><span class="n">mime_type</span> <span class="o">=</span> <span class="n">document_mime_type</span><span class="p">;</span>
<span class="cm">/* the name of the application that is registering the document</span>
<span class="cm"> * (also mandatory); usually, the same name you used with</span>
<span class="cm"> * the g_set_application_name () function.</span>
<span class="cm"> */</span>
<span class="n">recent_data</span><span class="o">-&</span><span class="n">app_name</span> <span class="o">=</span> <span class="n">APP_NAME</span><span class="p">;</span>
<span class="cm">/* the command to open a file; the %u string will be automagically</span>
<span class="cm"> * expanded to the document's URI when getting the application's</span>
<span class="cm"> * command line from the GtkRecentInfo object with</span>
<span class="cm"> * gtk_recent_info_get_application_info ()</span>
<span class="cm"> */</span>
<span class="n">recent_data</span><span class="o">-&</span><span class="n">app_exec</span> <span class="o">=</span> <span class="n">g_strjoin</span> <span class="p">(</span><span class="s">" "</span><span class="p">,</span> <span class="n">g_get_prgname</span> <span class="p">(),</span> <span class="s">"--open-file"</span><span class="p">,</span> <span class="s">"%u"</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">gtk_recent_manager_add_full</span> <span class="p">(</span><span class="n">manager</span><span class="p">,</span> <span class="n">document_uri</span><span class="p">,</span> <span class="n">recent_data</span><span class="p">))</span>
<span class="p">{</span>
<span class="cm">/* warn about the error */</span>
<span class="p">}</span>
<span class="n">g_free</span> <span class="p">(</span><span class="n">recent_data</span><span class="o">-></span><span class="n">app_exec</span><span class="p">);</span>
<span class="n">g_free</span> <span class="p">(</span><span class="n">recent_data</span><span class="p">);</span>
<span class="n">g_object_unref</span> <span class="p">(</span><span class="n">manager</span><span class="p">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
Getting the list of items is also similar to
<span class="structname">EggRecentModel</span>; the GtkRecentInfo data is
allocated at look up time in order not to waste memory keeping it
around, so you must remember to free the data inside the list and then
the list itself when you are done using it:
</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
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16</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">GtkRecentManager</span> <span class="o">*</span><span class="n">manager</span><span class="p">;</span>
<span class="n">GList</span> <span class="o">*</span><span class="n">recent_items</span><span class="p">,</span> <span class="o">*</span><span class="n">l</span><span class="p">;</span>
<span class="n">manager</span> <span class="o">=</span> <span class="n">gtk_recent_manager_get_default</span><span class="p">();</span>
<span class="n">recent_items</span> <span class="o">=</span> <span class="n">gtk_recent_manager_get_items</span> <span class="p">(</span><span class="n">manager</span><span class="p">);</span>
<span class="k">for</span> <span class="p">(</span><span class="n">l</span> <span class="o">=</span> <span class="n">recent_items</span><span class="p">;</span> <span class="n">l</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">;</span> <span class="n">l</span> <span class="o">=</span> <span class="n">l</span><span class="o">-></span><span class="n">next</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">GtkRecentInfo</span> <span class="o">*</span><span class="n">recent_info</span> <span class="o">=</span> <span class="n">l</span><span class="o">-></span><span class="n">data</span><span class="p">;</span>
<span class="n">do_something_with_the_item</span> <span class="p">(</span><span class="n">recent_info</span><span class="p">);</span>
<span class="p">}</span>
<span class="cm">/* free everything and the list */</span>
<span class="n">g_list_foreach</span> <span class="p">(</span><span class="n">recent_items</span><span class="p">,</span> <span class="p">(</span><span class="n">GFunc</span><span class="p">)</span> <span class="n">gtk_recent_info_unref</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="n">g_list_free</span> <span class="p">(</span><span class="n">recent_items</span><span class="p">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
You can also look up a single item:
</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</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">GtkRecentInfo</span> <span class="o">*</span><span class="n">recent_info</span><span class="p">;</span>
<span class="n">GError</span> <span class="o">*</span><span class="n">error</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span>
<span class="n">recent_info</span> <span class="o">=</span> <span class="n">gtk_recent_manager_lookup_item</span> <span class="p">(</span><span class="n">manager</span><span class="p">,</span> <span class="n">document_uri</span><span class="p">,</span> <span class="o">&</span><span class="n">error</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">error</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">display_error</span> <span class="p">(</span><span class="n">error</span><span class="p">);</span>
<span class="n">g_error_free</span> <span class="p">(</span><span class="n">error</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">else</span>
<span class="p">{</span>
<span class="n">do_something_with_the_item</span> <span class="p">(</span><span class="n">recent_info</span><span class="p">);</span>
<span class="n">gtk_recent_info_unref</span> <span class="p">(</span><span class="n">recent_info</span><span class="p">);</span>
<span class="p">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
The <a class="link" href="GtkRecentManager.html#GtkRecentInfo" title="GtkRecentInfo"><span class="type">GtkRecentInfo</span></a> is a reference counted boxed type, and it holds all
the meta-data of a recently used document, like its display name, its
description, the list of each application that has registered the
document or the list of groups to which the document belong.
</p>
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