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<div class="section" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="gtkrecent-advanced"></a>Advanced usage</h2></div></div></div>
<p>
The <a href="GtkRecentChooser.html" title="GtkRecentChooser"><span class="type">GtkRecentChooser</span></a> widgets might display items sorted and filtered,
either with already supplied or custom sorting and filtering functions.
The biggest difference from the <span class="structname">EggRecentView</span>
widgets in EggRecent is that the <a href="GtkRecentChooser.html" title="GtkRecentChooser"><span class="type">GtkRecentChooser</span></a> widgets will use
their own copy of the list and will apply the sorting and filtering
functions only on the copy; this allows the creation of many viewers
with a single controller, like using many <a href="GtkTreeView.html" title="GtkTreeView"><span class="type">GtkTreeView</span></a> with a single
<a href="GtkTreeModel.html" title="GtkTreeModel"><span class="type">GtkTreeModel</span></a> instance.
</p>
<p>
Available sorting methods are:
</p>
<div class="informalexample"><pre class="programlisting">
/* no sorting */
gtk_recent_chooser_set_sort_type (GTK_RECENT_CHOOSER (chooser), GTK_RECENT_SORT_NONE);
/* most recently used first */
gtk_recent_chooser_set_sort_type (GTK_RECENT_CHOOSER (chooser), GTK_RECENT_SORT_MRU);
/* most recently used last */
gtk_recent_chooser_set_sort_type (GTK_RECENT_CHOOSER (chooser), GTK_RECENT_SORT_LRU);
</pre></div>
<p>
You can create your own sorting function, and the use the
GTK_RECENT_SORT_CUSTOM method:
</p>
<div class="informalexample"><pre class="programlisting">
/* custom sorting function, based on the registration count
* (most used first)
*/
static void
sort_by_usage_count (GtkRecentInfo *a,
GtkRecentInfo *b,
gpointer data)
{
gint count_a, count_b;
count_a = count_b = 0;
if (gtk_recent_info_has_application (a, APP_NAME))
gtk_recent_info_get_application_info (a, APP_NAME, NULL, &count_a, NULL);
if (gtk_recent_info_has_application (b, APP_NAME))
gtk_recent_info_get_application_info (b, APP_NAME, NULL, &count_b, NULL);
return count_a < count_b;
}
...
/* set custom sorting and set the custom sorting function */
gtk_recent_chooser_set_sort_type (GTK_RECENT_CHOOSER (chooser),
GTK_RECENT_SORT_CUSTOM);
gtk_recent_chooser_set_sort_func (GTK_RECENT_CHOOSER,
sort_by_usage_count,
NULL, /* sort function data */
NULL /* destroy notify for the data */);
</pre></div>
<p>
</p>
<p>
Filtering is done using the <a href="GtkRecentFilter.html" title="GtkRecentFilter"><span class="type">GtkRecentFilter</span></a> object, similar to the
<a href="gtk-gtkfilefilter.html#GtkFileFilter"><span class="type">GtkFileFilter</span></a> object used by the <a href="GtkFileChooser.html" title="GtkFileChooser"><span class="type">GtkFileChooser</span></a> widgets. The
<a href="GtkRecentFilter.html" title="GtkRecentFilter"><span class="type">GtkRecentFilter</span></a> object has a set of pre-defined options based on the
meta-data exposed by the <a href="GtkRecentManager.html#GtkRecentInfo"><span class="type">GtkRecentInfo</span></a> object. It also allows custom
filtering function:
</p>
<div class="informalexample"><pre class="programlisting">
GtkRecentFilter *filter;
filter = gtk_recent_filter_new ();
/* set the user visible name of the filter */
gtk_recent_filter_set_name (filter, "Since Last Month");
/* set the maximum age of a recently used document */
gtk_recent_filter_set_age (filter, 31);
/* the chooser takes the ownership of the object */
gtk_recent_chooser_add_filter (GTK_RECENT_CHOOSER (chooser), filter);
/* set the currently used filter */
gtk_recent_chooser_set_filter (GTK_RECENT_CHOOSER (chooser), filter);
filter = gtk_recent_filter_new ();
gtk_recent_filter_set_name (filter, "Every text file");
gtk_recent_filter_set_mime_type (filter, "text/plain");
gtk_recent_chooser_add_filter (GTK_RECENT_CHOOSER (chooser), filter);
</pre></div>
<p>
The <a href="GtkRecentChooserWidget.html" title="GtkRecentChooserWidget"><span class="type">GtkRecentChooserWidget</span></a> and <a href="GtkRecentChooserDialog.html" title="GtkRecentChooserDialog"><span class="type">GtkRecentChooserDialog</span></a> widgets allow
multiple filters and the selection of an appropriate one; the
<a href="GtkRecentChooserMenu.html" title="GtkRecentChooserMenu"><span class="type">GtkRecentChooserMenu</span></a> widget allows just a single filter object.
</p>
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