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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Extensions to Gtk+: exo Reference Manual</title>
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<div class="refentry">
<a name="exo-Extensions-to-Gtk"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="exo-Extensions-to-Gtk.top_of_page"></a>Extensions to Gtk+</span></h2>
<p>Extensions to Gtk+ — Miscelleanous extensions to the Gtk+ library</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="exo-Extensions-to-Gtk.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="exo-Extensions-to-Gtk.html#exo-gtk-object-destroy-later" title="exo_gtk_object_destroy_later ()">exo_gtk_object_destroy_later</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="exo-Extensions-to-Gtk.html#exo-gtk-file-chooser-add-thumbnail-preview" title="exo_gtk_file_chooser_add_thumbnail_preview ()">exo_gtk_file_chooser_add_thumbnail_preview</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="exo-Extensions-to-Gtk.html#exo-gtk-url-about-dialog-hook" title="exo_gtk_url_about_dialog_hook ()">exo_gtk_url_about_dialog_hook</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GtkWidget</span> *
</td>
<td class="function_name">
<a class="link" href="exo-Extensions-to-Gtk.html#exo-gtk-dialog-get-action-area" title="exo_gtk_dialog_get_action_area ()">exo_gtk_dialog_get_action_area</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="exo-Extensions-to-Gtk.html#exo-gtk-dialog-add-secondary-button" title="exo_gtk_dialog_add_secondary_button ()">exo_gtk_dialog_add_secondary_button</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="exo-Extensions-to-Gtk.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <exo/exo.h>
</pre>
</div>
<div class="refsect1">
<a name="exo-Extensions-to-Gtk.description"></a><h2>Description</h2>
<p>Various additional functions to the core API provided by the Gtk+ library.</p>
<p>For example, <a class="link" href="exo-Extensions-to-Gtk.html#exo-gtk-file-chooser-add-thumbnail-preview" title="exo_gtk_file_chooser_add_thumbnail_preview ()"><code class="function">exo_gtk_file_chooser_add_thumbnail_preview()</code></a> is a
convenience method to add a thumbnail based preview widget to a
<span class="type">GtkFileChooser</span>, which will display a preview of the selected file if
either a thumbnail is available or a thumbnail could be generated using
the GdkPixbuf library.</p>
</div>
<div class="refsect1">
<a name="exo-Extensions-to-Gtk.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="exo-gtk-object-destroy-later"></a><h3>exo_gtk_object_destroy_later ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
exo_gtk_object_destroy_later (<em class="parameter"><code><span class="type">GtkWidget</span> *object</code></em>);</pre>
<p>Schedules an idle function to destroy the specified <em class="parameter"><code>object</code></em>
when the application enters the main loop the next time.</p>
<div class="refsect3">
<a name="exo-gtk-object-destroy-later.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>object</p></td>
<td class="parameter_description"><p>a <span class="type">GtkObject</span>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="exo-gtk-file-chooser-add-thumbnail-preview"></a><h3>exo_gtk_file_chooser_add_thumbnail_preview ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
exo_gtk_file_chooser_add_thumbnail_preview
(<em class="parameter"><code><span class="type">GtkFileChooser</span> *chooser</code></em>);</pre>
<p>This is a convenience function that adds a preview widget to the <em class="parameter"><code>chooser</code></em>
,
which displays thumbnails for the selected filenames using the thumbnail
database. The preview widget is also able to generate thumbnails for all
image formats supported by <span class="type">GdkPixbuf</span>.</p>
<p>Use this function whenever you display a <span class="type">GtkFileChooser</span> to ask the user
to select an image file from the file system.</p>
<p>The preview widget also supports URIs other than file:-URIs to a certain
degree, but this support is rather limited currently, so you may want to
use <code class="function">gtk_file_chooser_set_local_only()</code> to ensure that the user can only
select files from the local file system.</p>
<p>When <em class="parameter"><code>chooser</code></em>
is configured to select multiple image files - using the
<code class="function">gtk_file_chooser_set_select_multiple()</code> method - the behaviour of the
preview widget is currently undefined, in that it is not defined for
which of the selected files the preview will be displayed.</p>
<div class="refsect3">
<a name="exo-gtk-file-chooser-add-thumbnail-preview.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>chooser</p></td>
<td class="parameter_description"><p>a <span class="type">GtkFileChooser</span>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ch01.html#api-index-0.3.1.9" title="Added in 0.3.1.9">0.3.1.9</a></p>
</div>
<hr>
<div class="refsect2">
<a name="exo-gtk-url-about-dialog-hook"></a><h3>exo_gtk_url_about_dialog_hook ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
exo_gtk_url_about_dialog_hook (<em class="parameter"><code><span class="type">GtkAboutDialog</span> *about_dialog</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *address</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);</pre>
<p>This is a convenience function, which can be registered with <span class="type">GtkAboutDialog</span>,
to open links clicked by the user in <span class="type">GtkAboutDialog</span>s.</p>
<p>All you need to do is to register this hook with <code class="function">gtk_about_dialog_set_url_hook()</code>
and <code class="function">gtk_about_dialog_set_email_hook()</code>. This can be done prior to calling
<code class="function">gtk_show_about_dialog()</code>, for example:</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</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">show_about_dialog</span><span class="w"> </span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="n">gtk_show_about_dialog</span><span class="w"> </span><span class="p">(.....);</span>
<span class="p">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>This function is not needed when you use Gtk 2.18 or later, because from
that version this is implemented by default.</p>
<div class="refsect3">
<a name="exo-gtk-url-about-dialog-hook.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>about_dialog</p></td>
<td class="parameter_description"><p>the <span class="type">GtkAboutDialog</span> in which the user activated a link.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>address</p></td>
<td class="parameter_description"><p>the link, mail or web address, to open.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data that was passed when the function was
registered with <code class="function">gtk_about_dialog_set_email_hook()</code>
or <code class="function">gtk_about_dialog_set_url_hook()</code>. This is currently
unused within the context of this function, so you
can safely pass <code class="literal">NULL</code> when registering this hook
with <span class="type">GtkAboutDialog</span>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ch01.html#api-index-0.5.0" title="Added in 0.5.0">0.5.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="exo-gtk-dialog-get-action-area"></a><h3>exo_gtk_dialog_get_action_area ()</h3>
<pre class="programlisting"><span class="returnvalue">GtkWidget</span> *
exo_gtk_dialog_get_action_area (<em class="parameter"><code><span class="type">GtkDialog</span> *dialog</code></em>);</pre>
<p>Returns the action area of a <span class="type">GtkDialog</span>. The internal function has been
deprecated in GTK+, so this wraps and dispels the deprecation warning.</p>
<div class="refsect3">
<a name="exo-gtk-dialog-get-action-area.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dialog</p></td>
<td class="parameter_description"><p>a <span class="type">GtkDialog</span>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="exo-gtk-dialog-get-action-area.returns"></a><h4>Returns</h4>
<p> the action area.</p>
</div>
<p class="since">Since: <a class="link" href="ch01.html#api-index-0.11.4" title="Added in 0.11.4">0.11.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="exo-gtk-dialog-add-secondary-button"></a><h3>exo_gtk_dialog_add_secondary_button ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
exo_gtk_dialog_add_secondary_button (<em class="parameter"><code><span class="type">GtkDialog</span> *dialog</code></em>,
<em class="parameter"><code><span class="type">GtkWidget</span> *button</code></em>);</pre>
<p>Convenience function to add a secondary button to a <span class="type">GtkDialog</span>.</p>
<div class="refsect3">
<a name="exo-gtk-dialog-add-secondary-button.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dialog</p></td>
<td class="parameter_description"><p>a <span class="type">GtkDialog</span>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>button</p></td>
<td class="parameter_description"><p>a <span class="type">GtkButton</span> to add and mark as secondary.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ch01.html#api-index-0.11.4" title="Added in 0.11.4">0.11.4</a></p>
</div>
</div>
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