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<h2><span class="refentrytitle"><a name="libgwymodule-gwymodule-layer.top_of_page"></a>gwymodule-layer</span></h2>
<p>gwymodule-layer — GwyDataView layer modules</p>
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<a name="libgwymodule-gwymodule-layer.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libgwymodule/gwymodule.h>
<a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="libgwymodule-gwymodule-layer.html#gwy-layer-func-register" title="gwy_layer_func_register ()">gwy_layer_func_register</a> (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a> type</code></em>);
<span class="returnvalue">void</span> <a class="link" href="libgwymodule-gwymodule-layer.html#gwy-layer-func-foreach" title="gwy_layer_func_foreach ()">gwy_layer_func_foreach</a> (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Doubly-Linked-Lists.html#GFunc"><span class="type">GFunc</span></a> function</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
</pre>
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<div class="refsect1">
<a name="libgwymodule-gwymodule-layer.description"></a><h2>Description</h2>
<p>
Layer modules implement <a href="../libgwydgets/GwyDataView.html"><span class="type">GwyDataView</span></a> layers, corresponding to different
kinds of selections.
</p>
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<a name="libgwymodule-gwymodule-layer.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gwy-layer-func-register"></a><h3>gwy_layer_func_register ()</h3>
<pre class="programlisting"><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gwy_layer_func_register (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a> type</code></em>);</pre>
<p>
Registeres a layer function (layer type).
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<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>Layer type in GObject type system. That is the return value of
<code class="function">gwy_layer_foo_get_type()</code>.</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Normally <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>; <a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> on failure.</td>
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<div class="refsect2">
<a name="gwy-layer-func-foreach"></a><h3>gwy_layer_func_foreach ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gwy_layer_func_foreach (<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Doubly-Linked-Lists.html#GFunc"><span class="type">GFunc</span></a> function</code></em>,
<em class="parameter"><code><a href="http://developer.gnome.org/doc/API/2.0/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Calls a function for each layer function.
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<td><p><span class="term"><em class="parameter"><code>function</code></em> :</span></p></td>
<td>Function to run for each layer function. It will get function
name (constant string owned by module system) as its first
argument, <em class="parameter"><code>user_data</code></em> as the second argument.</td>
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<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>Data to pass to <em class="parameter"><code>function</code></em>.</td>
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