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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Using the CSS file format: GTK+ 3 Reference Manual</title>
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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="gtk-migrating-GtkStyleContext-css"></a>Using the CSS file format</h2></div></div></div>
<p>
The syntax of RC and CSS files formats is obviously different.
The CSS-like syntax will hopefully be much more familiar to many
people, lowering the barrier for custom theming.
</p>
<p>
Instead of going through the syntax differences one-by-one, we
will present a more or less comprehensive example and discuss
how it can be translated into CSS:
</p>
<div class="example">
<a name="id-1.6.4.6.4"></a><p class="title"><b>Example 44. Sample RC code</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
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<td class="listing_code"><pre class="programlisting">style <span class="string">"default"</span> <span class="gtkdoc opt">{</span>
xthickness <span class="gtkdoc opt">=</span> <span class="number">1</span>
ythickness <span class="gtkdoc opt">=</span> <span class="number">1</span>
GtkButton<span class="gtkdoc opt">::</span>child<span class="gtkdoc opt">-</span>displacement<span class="gtkdoc opt">-</span>x <span class="gtkdoc opt">=</span> <span class="number">1</span>
GtkButton<span class="gtkdoc opt">::</span>child<span class="gtkdoc opt">-</span>displacement<span class="gtkdoc opt">-</span>y <span class="gtkdoc opt">=</span> <span class="number">1</span>
GtkCheckButton<span class="gtkdoc opt">::</span>indicator<span class="gtkdoc opt">-</span>size <span class="gtkdoc opt">=</span> <span class="number">14</span>
bg<span class="gtkdoc opt">[</span>NORMAL<span class="gtkdoc opt">] =</span> @bg_color
bg<span class="gtkdoc opt">[</span>PRELIGHT<span class="gtkdoc opt">] =</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span><span class="number">1.02</span><span class="gtkdoc opt">,</span> @bg_color<span class="gtkdoc opt">)</span>
bg<span class="gtkdoc opt">[</span>SELECTED<span class="gtkdoc opt">] =</span> @selected_bg_color
bg<span class="gtkdoc opt">[</span>INSENSITIVE<span class="gtkdoc opt">] =</span> @bg_color
bg<span class="gtkdoc opt">[</span>ACTIVE<span class="gtkdoc opt">] =</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span><span class="number">0.9</span><span class="gtkdoc opt">,</span> @bg_color<span class="gtkdoc opt">)</span>
fg<span class="gtkdoc opt">[</span>NORMAL<span class="gtkdoc opt">] =</span> @fg_color
fg<span class="gtkdoc opt">[</span>PRELIGHT<span class="gtkdoc opt">] =</span> @fg_color
fg<span class="gtkdoc opt">[</span>SELECTED<span class="gtkdoc opt">] =</span> @selected_fg_color
fg<span class="gtkdoc opt">[</span>INSENSITIVE<span class="gtkdoc opt">] =</span> <span class="function">darker</span> <span class="gtkdoc opt">(</span>@bg_color<span class="gtkdoc opt">)</span>
fg<span class="gtkdoc opt">[</span>ACTIVE<span class="gtkdoc opt">] =</span> @fg_color
text<span class="gtkdoc opt">[</span>NORMAL<span class="gtkdoc opt">] =</span> @text_color
text<span class="gtkdoc opt">[</span>PRELIGHT<span class="gtkdoc opt">] =</span> @text_color
text<span class="gtkdoc opt">[</span>SELECTED<span class="gtkdoc opt">] =</span> @selected_fg_color
text<span class="gtkdoc opt">[</span>INSENSITIVE<span class="gtkdoc opt">] =</span> <span class="function">darker</span> <span class="gtkdoc opt">(</span>@bg_color<span class="gtkdoc opt">)</span>
text<span class="gtkdoc opt">[</span>ACTIVE<span class="gtkdoc opt">] =</span> @selected_fg_color
base<span class="gtkdoc opt">[</span>NORMAL<span class="gtkdoc opt">] =</span> @base_color
base<span class="gtkdoc opt">[</span>PRELIGHT<span class="gtkdoc opt">] =</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span><span class="number">0.95</span><span class="gtkdoc opt">,</span> @bg_color<span class="gtkdoc opt">)</span>
base<span class="gtkdoc opt">[</span>SELECTED<span class="gtkdoc opt">] =</span> @selected_bg_color
base<span class="gtkdoc opt">[</span>INSENSITIVE<span class="gtkdoc opt">] =</span> @bg_color
base<span class="gtkdoc opt">[</span>ACTIVE<span class="gtkdoc opt">] =</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span><span class="number">0.9</span><span class="gtkdoc opt">,</span> @selected_bg_color<span class="gtkdoc opt">)</span>
engine <span class="string">"clearlooks"</span> <span class="gtkdoc opt">{</span>
colorize_scrollbar <span class="gtkdoc opt">=</span> TRUE
style <span class="gtkdoc opt">=</span> CLASSIC
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">}</span>
style <span class="string">"tooltips"</span> <span class="gtkdoc opt">{</span>
xthickness <span class="gtkdoc opt">=</span> <span class="number">4</span>
ythickness <span class="gtkdoc opt">=</span> <span class="number">4</span>
bg<span class="gtkdoc opt">[</span>NORMAL<span class="gtkdoc opt">] =</span> @tooltip_bg_color
fg<span class="gtkdoc opt">[</span>NORMAL<span class="gtkdoc opt">] =</span> @tooltip_fg_color
<span class="gtkdoc opt">}</span>
style <span class="string">"button"</span> <span class="gtkdoc opt">{</span>
xthickness <span class="gtkdoc opt">=</span> <span class="number">3</span>
ythickness <span class="gtkdoc opt">=</span> <span class="number">3</span>
bg<span class="gtkdoc opt">[</span>NORMAL<span class="gtkdoc opt">] =</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span><span class="number">1.04</span><span class="gtkdoc opt">,</span> @bg_color<span class="gtkdoc opt">)</span>
bg<span class="gtkdoc opt">[</span>PRELIGHT<span class="gtkdoc opt">] =</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span><span class="number">1.06</span><span class="gtkdoc opt">,</span> @bg_color<span class="gtkdoc opt">)</span>
bg<span class="gtkdoc opt">[</span>ACTIVE<span class="gtkdoc opt">] =</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span><span class="number">0.85</span><span class="gtkdoc opt">,</span> @bg_color<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">}</span>
style <span class="string">"entry"</span> <span class="gtkdoc opt">{</span>
xthickness <span class="gtkdoc opt">=</span> <span class="number">3</span>
ythickness <span class="gtkdoc opt">=</span> <span class="number">3</span>
bg<span class="gtkdoc opt">[</span>SELECTED<span class="gtkdoc opt">] =</span> <span class="function">mix</span> <span class="gtkdoc opt">(</span><span class="number">0.4</span><span class="gtkdoc opt">,</span> @selected_bg_color<span class="gtkdoc opt">,</span> @base_color<span class="gtkdoc opt">)</span>
fg<span class="gtkdoc opt">[</span>SELECTED<span class="gtkdoc opt">] =</span> @text_color
engine <span class="string">"clearlooks"</span> <span class="gtkdoc opt">{</span>
focus_color <span class="gtkdoc opt">=</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span><span class="number">0.65</span><span class="gtkdoc opt">,</span> @selected_bg_color<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">}</span>
style <span class="string">"other"</span> <span class="gtkdoc opt">{</span>
bg<span class="gtkdoc opt">[</span>NORMAL<span class="gtkdoc opt">] =</span> <span class="gtkdoc ppc">#fff;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc kwc">class</span> <span class="string">"GtkWidget"</span> style <span class="string">"default"</span>
<span class="gtkdoc kwc">class</span> <span class="string">"GtkEntry"</span> style <span class="string">"entry"</span>
widget_class <span class="string">"*<GtkButton>"</span> style <span class="string">"button"</span>
widget <span class="string">"gtk-tooltip*"</span> style <span class="string">"tooltips"</span>
widget_class <span class="string">"window-name.*.GtkButton"</span> style <span class="string">"other"</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>
would roughly translate to this CSS:
</p>
<div class="example">
<a name="id-1.6.4.6.6"></a><p class="title"><b>Example 45. CSS translation</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
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<td class="listing_code"><pre class="programlisting"><span class="gtkdoc opt">* {</span>
padding<span class="gtkdoc opt">:</span> <span class="number">1</span><span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">-</span>GtkButton<span class="gtkdoc opt">-</span>child<span class="gtkdoc opt">-</span>displacement<span class="gtkdoc opt">-</span>x<span class="gtkdoc opt">:</span> <span class="number">1</span><span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">-</span>GtkButton<span class="gtkdoc opt">-</span>child<span class="gtkdoc opt">-</span>displacement<span class="gtkdoc opt">-</span>y<span class="gtkdoc opt">:</span> <span class="number">1</span><span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">-</span>GtkCheckButton<span class="gtkdoc opt">-</span>indicator<span class="gtkdoc opt">-</span>size<span class="gtkdoc opt">:</span> <span class="number">14</span><span class="gtkdoc opt">;</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> @bg_color<span class="gtkdoc opt">;</span>
color<span class="gtkdoc opt">:</span> @fg_color<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">-</span>Clearlooks<span class="gtkdoc opt">-</span>colorize<span class="gtkdoc opt">-</span>scrollbar<span class="gtkdoc opt">:</span> <span class="keyword">true</span><span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">-</span>Clearlooks<span class="gtkdoc opt">-</span>style<span class="gtkdoc opt">:</span> classic<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">*:</span>hover <span class="gtkdoc opt">{</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span>@bg_color<span class="gtkdoc opt">,</span> <span class="number">1.02</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">*:</span>selected <span class="gtkdoc opt">{</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> @selected_bg_color<span class="gtkdoc opt">;</span>
color<span class="gtkdoc opt">:</span> @selected_fg_color<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">*:</span>insensitive <span class="gtkdoc opt">{</span>
color<span class="gtkdoc opt">:</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span>@bg_color<span class="gtkdoc opt">,</span> <span class="number">0.7</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">*:</span>active <span class="gtkdoc opt">{</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span>@bg_color<span class="gtkdoc opt">,</span> <span class="number">0.9</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">.</span>tooltip <span class="gtkdoc opt">{</span>
padding<span class="gtkdoc opt">:</span> <span class="number">4</span><span class="gtkdoc opt">;</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> @tooltip_bg_color<span class="gtkdoc opt">;</span>
color<span class="gtkdoc opt">:</span> @tooltip_fg_color<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">.</span>button <span class="gtkdoc opt">{</span>
padding<span class="gtkdoc opt">:</span> <span class="number">3</span><span class="gtkdoc opt">;</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span>@bg_color<span class="gtkdoc opt">,</span> <span class="number">1.04</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">.</span>button<span class="gtkdoc opt">:</span>hover <span class="gtkdoc opt">{</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span>@bg_color<span class="gtkdoc opt">,</span> <span class="number">1.06</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">.</span>button<span class="gtkdoc opt">:</span>active <span class="gtkdoc opt">{</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> <span class="function">shade</span> <span class="gtkdoc opt">(</span>@bg_color<span class="gtkdoc opt">,</span> <span class="number">0.85</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">.</span>entry <span class="gtkdoc opt">{</span>
padding<span class="gtkdoc opt">:</span> <span class="number">3</span><span class="gtkdoc opt">;</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> @base_color<span class="gtkdoc opt">;</span>
color<span class="gtkdoc opt">:</span> @text_color<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">.</span>entry<span class="gtkdoc opt">:</span>selected <span class="gtkdoc opt">{</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> <span class="function">mix</span> <span class="gtkdoc opt">(</span>@selected_bg_color<span class="gtkdoc opt">,</span> @base_color<span class="gtkdoc opt">,</span> <span class="number">0.4</span><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">shade</span> <span class="gtkdoc opt">(</span><span class="number">0.65</span><span class="gtkdoc opt">,</span> @selected_bg_color<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">}</span>
<span class="comment">/* The latter selector is an specification of the first,</span>
<span class="comment"> since any widget may use the same classes or names */</span>
<span class="gtkdoc ppc">#window-name .button,</span>
GtkWindow<span class="gtkdoc ppc">#window-name GtkButton.button {</span>
background<span class="gtkdoc opt">-</span>color<span class="gtkdoc opt">:</span> <span class="gtkdoc ppc">#fff;</span>
<span class="gtkdoc opt">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>
One notable difference is the reduction from fg/bg/text/base colors
to only foreground/background, in exchange the widget is able to render
its various elements with different CSS classes, which can be themed
independently.
</p>
<p>
In the same vein, the light, dark and mid color variants that
were available in GtkStyle should be replaced by a combination of
symbolic colors and custom CSS, where necessary. text_aa should
really not be used anywhere, anyway, and the white and black colors
that were available in GtkStyle can just be replaced by literal
GdkRGBA structs.
</p>
<p>
Access to colors has also changed a bit. With <a class="link" href="GtkStyle.html" title="GtkStyle"><span class="type">GtkStyle</span></a>, the common
way to access colors is:
</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">GdkColor <span class="gtkdoc opt">*</span>color1<span class="gtkdoc opt">;</span>
GdkColor color2<span class="gtkdoc opt">;</span>
color1 <span class="gtkdoc opt">= &</span>style<span class="gtkdoc opt">-></span>bg<span class="gtkdoc opt">[</span>GTK_STATE_PRELIGHT<span class="gtkdoc opt">];</span>
<span class="function"><a href="GtkStyle.html#gtk-style-lookup-color">gtk_style_lookup_color</a></span> <span class="gtkdoc opt">(</span>style<span class="gtkdoc opt">,</span> <span class="string">"focus_color"</span><span class="gtkdoc opt">, &</span>color2<span class="gtkdoc opt">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
With <a class="link" href="GtkStyleContext.html" title="GtkStyleContext"><span class="type">GtkStyleContext</span></a>, you generally use <a href="http://developer.gnome.org/gdk3/gdk4-RGBA-Colors.html#GdkRGBA"><span class="type">GdkRGBA</span></a> instead of <span class="type">GdkColor</span>
and the code looks like this:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
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<td class="listing_code"><pre class="programlisting">GdkRGBA <span class="gtkdoc opt">*</span>color1<span class="gtkdoc opt">;</span>
GdkRGBA color2<span class="gtkdoc opt">;</span>
<span class="function"><a href="GtkStyleContext.html#gtk-style-context-get">gtk_style_context_get</a></span> <span class="gtkdoc opt">(</span>context<span class="gtkdoc opt">,</span> GTK_STATE_FLAG_PRELIGHT<span class="gtkdoc opt">,</span>
<span class="string">"background-color"</span><span class="gtkdoc opt">, &</span>color1<span class="gtkdoc opt">,</span>
NULL<span class="gtkdoc opt">);</span>
<span class="function"><a href="GtkStyleContext.html#gtk-style-context-lookup-color">gtk_style_context_lookup_color</a></span> <span class="gtkdoc opt">(</span>context<span class="gtkdoc opt">,</span> <span class="string">"focus_color"</span><span class="gtkdoc opt">, &</span>color2<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">...</span>
<span class="function"><a href="http://developer.gnome.org/gdk3/gdk4-RGBA-Colors.html#gdk-rgba-free">gdk_rgba_free</a></span> <span class="gtkdoc opt">(</span>color1<span class="gtkdoc opt">);</span></pre></td>
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<p>
Note that the memory handling here is different: <a class="link" href="GtkStyleContext.html#gtk-style-context-get" title="gtk_style_context_get ()"><code class="function">gtk_style_context_get()</code></a>
expects the address of a GdkRGBA* and returns a newly allocated struct,
<a class="link" href="GtkStyleContext.html#gtk-style-context-lookup-color" title="gtk_style_context_lookup_color ()"><code class="function">gtk_style_context_lookup_color()</code></a> expects the address of an existing
struct, and fills it.
</p>
<p>
It is worth mentioning that the new file format does not support
custom keybindings nor stock icon mappings as the RC format did.
</p>
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