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<a name="gtk-migrating-GtkStyleContext-parser-extensions"></a>Extending the CSS parser</h2></div></div></div>
<p>
In <a class="link" href="GtkStyle.html" title="GtkStyle"><span class="type">GtkStyle</span></a>-based engines, GtkRCStyle provided ways to extend the
gtkrc parser with engine-specific extensions. This has been replaced
by <a class="link" href="GtkThemingEngine.html#gtk-theming-engine-register-property" title="gtk_theming_engine_register_property ()"><code class="function">gtk_theming_engine_register_property()</code></a>, which lets a theme engine
register new properties with an arbitrary type. While there is built-in
support for most basic types, it is possible to use a custom parser
for the property.
</p>
<p>
The installed properties depend on the <a class="link" href="GtkThemingEngine.html#GtkThemingEngine--name" title="The “name” property"><span class="type">“name”</span></a> property,
so they should be added in the <code class="literal"><code class="function">constructed()</code></code> vfunc.
For example, if an engine with the name "Clearlooks" installs a
"focus-color" property with the type <a href="http://developer.gnome.org/gdk3/gdk4-RGBA-Colors.html#GdkRGBA"><span class="type">GdkRGBA</span></a>, the property
<code class="literal">-Clearlooks-focus-color</code> will be registered and
accepted in CSS like this:
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<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting">GtkEntry <span class="gtkdoc opt">{</span>
<span class="gtkdoc opt">-</span>Clearlooks<span class="gtkdoc opt">-</span>focus<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> <span class="function">rgba</span><span class="gtkdoc opt">(</span><span class="number">255</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">1.0</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span></pre></td>
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<p>
Widget style properties also follow a similar syntax, with the widget
type name used as a prefix. For example, the <a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a> focus-line-width
style property can be modified in CSS as
<code class="literal">-GtkWidget-focus-line-width</code>.
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