GTK+ adds several additional ways to specify colors.
</para>
-<literallayout><code>〈gtk color〉 = 〈color expression〉| 〈win32 color〉</code>
+<literallayout><code>〈gtk color〉 = 〈symbolic color〉 | 〈color expression〉| 〈win32 color〉</code>
</literallayout>
<para>
- GTK+ allows to form color expressions, which can be nested and
+ The first is a reference to a color defined via a @define-color rule.
+ The syntax for @define-color rules is as follows:
+ </para>
+
+<literallayout><code>〈define color rule〉 = @define-color 〈name〉 〈color〉</code>
+</literallayout>
+
+ <para>
+ To refer to the color defined by a @define-color rule,
+ use the name from the rule, prefixed with @.
+ </para>
+
+<literallayout><code>〈symbolic color〉 = @〈name〉</code>
+</literallayout>
+
+ <example><title>An example for defining colors</title>
+ <programlisting><![CDATA[
+@define-color bg_color #f9a039;
+
+* {
+background-color: @bg_color;
+}
+]]></programlisting>
+ </example>
+
+ <para>
+ GTK+ also allows to form color expressions, which can be nested and
provide a rich language to define colors which are derived from a
set of base colors.
</para>
<para>
-gtk-icon-palette defines a color palette for recoloring symbolic
icons. The recognized names for colors in symbolic icons are error,
- warning and success.
+ warning and success. The default palette maps these three names to
+ symbolic colors with the names @error_color, @warning_color and
+ @error_color.
</para>
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