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<div class="refentry">
<a name="GtkOverlay"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GtkOverlay.top_of_page"></a>GtkOverlay</span></h2>
<p>GtkOverlay — A container which overlays widgets on top of each other</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GtkOverlay.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="GtkWidget.html" title="GtkWidget"><span class="returnvalue">GtkWidget</span></a> *
</td>
<td class="function_name">
<a class="link" href="GtkOverlay.html#gtk-overlay-new" title="gtk_overlay_new ()">gtk_overlay_new</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="GtkOverlay.html#gtk-overlay-add-overlay" title="gtk_overlay_add_overlay ()">gtk_overlay_add_overlay</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="GtkOverlay.html#gtk-overlay-reorder-overlay" title="gtk_overlay_reorder_overlay ()">gtk_overlay_reorder_overlay</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="GtkOverlay.html#gtk-overlay-get-overlay-pass-through" title="gtk_overlay_get_overlay_pass_through ()">gtk_overlay_get_overlay_pass_through</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="GtkOverlay.html#gtk-overlay-set-overlay-pass-through" title="gtk_overlay_set_overlay_pass_through ()">gtk_overlay_set_overlay_pass_through</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GtkOverlay.child-properties"></a><h2>Child Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="child_properties_type">
<col width="300px" class="child_properties_name">
<col width="200px" class="child_properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><span class="type">gint</span></td>
<td class="property_name"><a class="link" href="GtkOverlay.html#GtkOverlay--c-index" title="The “index” child property">index</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><span class="type">gboolean</span></td>
<td class="property_name"><a class="link" href="GtkOverlay.html#GtkOverlay--c-pass-through" title="The “pass-through” child property">pass-through</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GtkOverlay.signals"></a><h2>Signals</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody><tr>
<td class="signal_type"><span class="returnvalue">gboolean</span></td>
<td class="signal_name"><a class="link" href="GtkOverlay.html#GtkOverlay-get-child-position" title="The “get-child-position” signal">get-child-position</a></td>
<td class="signal_flags">Run Last</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GtkOverlay.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GtkOverlay.html#GtkOverlay-struct" title="struct GtkOverlay">GtkOverlay</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GtkOverlay.html#GtkOverlayClass" title="struct GtkOverlayClass">GtkOverlayClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GtkOverlay.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> GObject
<span class="lineart">╰──</span> GInitiallyUnowned
<span class="lineart">╰──</span> <a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>
<span class="lineart">╰──</span> <a class="link" href="GtkContainer.html" title="GtkContainer">GtkContainer</a>
<span class="lineart">╰──</span> <a class="link" href="GtkBin.html" title="GtkBin">GtkBin</a>
<span class="lineart">╰──</span> GtkOverlay
</pre>
</div>
<div class="refsect1">
<a name="GtkOverlay.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GtkOverlay implements
AtkImplementorIface and <a class="link" href="GtkBuildable.html" title="GtkBuildable">GtkBuildable</a>.</p>
</div>
<div class="refsect1">
<a name="GtkOverlay.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <gtk/gtkunixprint.h>
</pre>
</div>
<div class="refsect1">
<a name="GtkOverlay.description"></a><h2>Description</h2>
<p>GtkOverlay is a container which contains a single main child, on top
of which it can place “overlay” widgets. The position of each overlay
widget is determined by its <a class="link" href="GtkWidget.html#GtkWidget--halign" title="The “halign” property"><span class="type">“halign”</span></a> and <a class="link" href="GtkWidget.html#GtkWidget--valign" title="The “valign” property"><span class="type">“valign”</span></a>
properties. E.g. a widget with both alignments set to <a class="link" href="GtkWidget.html#GTK-ALIGN-START:CAPS"><code class="literal">GTK_ALIGN_START</code></a>
will be placed at the top left corner of the GtkOverlay container,
whereas an overlay with halign set to <a class="link" href="GtkWidget.html#GTK-ALIGN-CENTER:CAPS"><code class="literal">GTK_ALIGN_CENTER</code></a> and valign set
to <a class="link" href="GtkWidget.html#GTK-ALIGN-END:CAPS"><code class="literal">GTK_ALIGN_END</code></a> will be placed a the bottom edge of the GtkOverlay,
horizontally centered. The position can be adjusted by setting the margin
properties of the child to non-zero values.</p>
<p>More complicated placement of overlays is possible by connecting
to the <a class="link" href="GtkOverlay.html#GtkOverlay-get-child-position" title="The “get-child-position” signal"><span class="type">“get-child-position”</span></a> signal.</p>
<div class="refsect2">
<a name="id-1.3.7.12.10.4"></a><h3>GtkOverlay as GtkBuildable</h3>
<p>The GtkOverlay implementation of the GtkBuildable interface
supports placing a child as an overlay by specifying “overlay” as
the “type” attribute of a <code class="literal"><child></code> element.</p>
</div>
<hr>
<div class="refsect2">
<a name="id-1.3.7.12.10.5"></a><h3>CSS nodes</h3>
<p>GtkOverlay has a single CSS node with the name “overlay”. Overlay children
whose alignments cause them to be positioned at an edge get the style classes
“.left”, “.right”, “.top”, and/or “.bottom” according to their position.</p>
</div>
</div>
<div class="refsect1">
<a name="GtkOverlay.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gtk-overlay-new"></a><h3>gtk_overlay_new ()</h3>
<pre class="programlisting"><a class="link" href="GtkWidget.html" title="GtkWidget"><span class="returnvalue">GtkWidget</span></a> *
gtk_overlay_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Creates a new <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a>.</p>
<div class="refsect3">
<a name="gtk-overlay-new.returns"></a><h4>Returns</h4>
<p> a new <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a> object.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-3-2.html#api-index-3.2">3.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-overlay-add-overlay"></a><h3>gtk_overlay_add_overlay ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gtk_overlay_add_overlay (<em class="parameter"><code><a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a> *overlay</code></em>,
<em class="parameter"><code><a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> *widget</code></em>);</pre>
<p>Adds <em class="parameter"><code>widget</code></em>
to <em class="parameter"><code>overlay</code></em>
.</p>
<p>The widget will be stacked on top of the main widget
added with <a class="link" href="GtkContainer.html#gtk-container-add" title="gtk_container_add ()"><code class="function">gtk_container_add()</code></a>.</p>
<p>The position at which <em class="parameter"><code>widget</code></em>
is placed is determined
from its <a class="link" href="GtkWidget.html#GtkWidget--halign" title="The “halign” property"><span class="type">“halign”</span></a> and <a class="link" href="GtkWidget.html#GtkWidget--valign" title="The “valign” property"><span class="type">“valign”</span></a> properties.</p>
<div class="refsect3">
<a name="gtk-overlay-add-overlay.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>overlay</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>widget</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> to be added to the container</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-3-2.html#api-index-3.2">3.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-overlay-reorder-overlay"></a><h3>gtk_overlay_reorder_overlay ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gtk_overlay_reorder_overlay (<em class="parameter"><code><a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a> *overlay</code></em>,
<em class="parameter"><code><a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> *child</code></em>,
<em class="parameter"><code><span class="type">gint</span> position</code></em>);</pre>
<p>Moves <em class="parameter"><code>child</code></em>
to a new <em class="parameter"><code>index</code></em>
in the list of <em class="parameter"><code>overlay</code></em>
children.
The list contains overlays in the order that these were
added to <em class="parameter"><code>overlay</code></em>
.</p>
<p>A widget’s index in the <em class="parameter"><code>overlay</code></em>
children list determines which order
the children are drawn if they overlap. The first child is drawn at
the bottom. It also affects the default focus chain order.</p>
<div class="refsect3">
<a name="gtk-overlay-reorder-overlay.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>overlay</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>child</p></td>
<td class="parameter_description"><p>the overlaid <a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> to move</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>position</p></td>
<td class="parameter_description"><p>the new index for <em class="parameter"><code>child</code></em>
in the list of overlay children
of <em class="parameter"><code>overlay</code></em>
, starting from 0. If negative, indicates the end of
the list</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-3-18.html#api-index-3.18">3.18</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-overlay-get-overlay-pass-through"></a><h3>gtk_overlay_get_overlay_pass_through ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gtk_overlay_get_overlay_pass_through (<em class="parameter"><code><a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a> *overlay</code></em>,
<em class="parameter"><code><a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> *widget</code></em>);</pre>
<p>Convenience function to get the value of the <span class="type">“pass-through”</span>
child property for <em class="parameter"><code>widget</code></em>
.</p>
<div class="refsect3">
<a name="gtk-overlay-get-overlay-pass-through.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>overlay</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>widget</p></td>
<td class="parameter_description"><p>an overlay child of <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gtk-overlay-get-overlay-pass-through.returns"></a><h4>Returns</h4>
<p> whether the widget is a pass through child.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-3-18.html#api-index-3.18">3.18</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gtk-overlay-set-overlay-pass-through"></a><h3>gtk_overlay_set_overlay_pass_through ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gtk_overlay_set_overlay_pass_through (<em class="parameter"><code><a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a> *overlay</code></em>,
<em class="parameter"><code><a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> *widget</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> pass_through</code></em>);</pre>
<p>Convenience function to set the value of the <span class="type">“pass-through”</span>
child property for <em class="parameter"><code>widget</code></em>
.</p>
<div class="refsect3">
<a name="gtk-overlay-set-overlay-pass-through.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>overlay</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>widget</p></td>
<td class="parameter_description"><p>an overlay child of <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pass_through</p></td>
<td class="parameter_description"><p>whether the child should pass the input through</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="api-index-3-18.html#api-index-3.18">3.18</a></p>
</div>
</div>
<div class="refsect1">
<a name="GtkOverlay.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GtkOverlay-struct"></a><h3>struct GtkOverlay</h3>
<pre class="programlisting">struct GtkOverlay;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GtkOverlayClass"></a><h3>struct GtkOverlayClass</h3>
<pre class="programlisting">struct GtkOverlayClass {
GtkBinClass parent_class;
gboolean (*get_child_position) (GtkOverlay *overlay,
GtkWidget *widget,
GtkAllocation *allocation);
};
</pre>
<div class="refsect3">
<a name="GtkOverlayClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody><tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GtkOverlayClass.get-child-position"></a>get_child_position</code></em> ()</p></td>
<td class="struct_member_description"><p>Signal emitted to determine the position and
size of any overlay child widgets.</p></td>
<td class="struct_member_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="GtkOverlay.child-property-details"></a><h2>Child Property Details</h2>
<div class="refsect2">
<a name="GtkOverlay--c-index"></a><h3>The <code class="literal">“index”</code> child property</h3>
<pre class="programlisting"> “index” <span class="type">gint</span></pre>
<p>The index of the overlay in the parent, -1 for the main child.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= -1</p>
<p>Default value: 0</p>
<p class="since">Since: <a class="link" href="api-index-3-18.html#api-index-3.18">3.18</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GtkOverlay--c-pass-through"></a><h3>The <code class="literal">“pass-through”</code> child property</h3>
<pre class="programlisting"> “pass-through” <span class="type">gboolean</span></pre>
<p>Pass through input, does not affect main child.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
<p class="since">Since: <a class="link" href="api-index-3-18.html#api-index-3.18">3.18</a></p>
</div>
</div>
<div class="refsect1">
<a name="GtkOverlay.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GtkOverlay-get-child-position"></a><h3>The <code class="literal">“get-child-position”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
user_function (<a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a> *overlay,
<a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> *widget,
<a href="../html/gdk3-Points-Rectangles-and-Regions.html#GdkRectangle"><span class="type">GdkRectangle</span></a> *allocation,
<span class="type">gpointer</span> user_data)</pre>
<p>The ::get-child-position signal is emitted to determine
the position and size of any overlay child widgets. A
handler for this signal should fill <em class="parameter"><code>allocation</code></em>
with
the desired position and size for <em class="parameter"><code>widget</code></em>
, relative to
the 'main' child of <em class="parameter"><code>overlay</code></em>
.</p>
<p>The default handler for this signal uses the <em class="parameter"><code>widget</code></em>
's
halign and valign properties to determine the position
and gives the widget its natural size (except that an
alignment of <a class="link" href="GtkWidget.html#GTK-ALIGN-FILL:CAPS"><code class="literal">GTK_ALIGN_FILL</code></a> will cause the overlay to
be full-width/height). If the main child is a
<a class="link" href="GtkScrolledWindow.html" title="GtkScrolledWindow"><span class="type">GtkScrolledWindow</span></a>, the overlays are placed relative
to its contents.</p>
<div class="refsect3">
<a name="GtkOverlay-get-child-position.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>overlay</p></td>
<td class="parameter_description"><p>the <a class="link" href="GtkOverlay.html" title="GtkOverlay"><span class="type">GtkOverlay</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>widget</p></td>
<td class="parameter_description"><p>the child widget to position</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>allocation</p></td>
<td class="parameter_description"><p>return
location for the allocation. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> Gdk.Rectangle][<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GtkOverlay-get-child-position.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the <em class="parameter"><code>allocation</code></em>
has been filled</p>
</div>
<p>Flags: Run Last</p>
</div>
</div>
</div>
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