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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="gtk-migrating-GtkStyleContext-checklist"></a>A checklist for widgets</h2></div></div></div>
<p>
When porting your widgets to use <a class="link" href="GtkStyleContext.html" title="GtkStyleContext"><span class="type">GtkStyleContext</span></a>, this checklist
might be useful.
</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
Replace <a class="link" href="GtkWidget.html#GtkWidget-style-set" title="The “style-set” signal"><span class="type">“style-set”</span></a> handlers with
<a class="link" href="GtkWidget.html#GtkWidget-style-updated" title="The “style-updated” signal"><span class="type">“style-updated”</span></a> handlers.
</li>
<li class="listitem">
<p>
Try to identify the role of what you're rendering with any number
of classes. This will replace the detail string. There is a predefined
set of CSS classes which you can reuse where appropriate. Doing so
will give you theming 'for free', whereas custom classes will require
extra work in the theme. Note that complex widgets are likely to
need different styles when rendering different parts, and style
classes are one way to achieve this. This could result in code like
the following (simplified) examples:
</p>
<div class="example">
<a name="id-1.6.4.7.3.2.2"></a><p class="title"><b>Example 46. Setting a permanent CSS class</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
2
3
4
5
6
7
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9
10
11
12</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"></span>
<span class="nf">gtk_button_init</span><span class="w"> </span><span class="p">(</span><span class="n">GtkButton</span><span class="w"> </span><span class="o">*</span><span class="n">button</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">GtkStyleContext</span><span class="w"> </span><span class="o">*</span><span class="n">context</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="w"> </span><span class="n">context</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">gtk_widget_get_style_context</span><span class="w"> </span><span class="p">(</span><span class="n">GTK_WIDGET</span><span class="w"> </span><span class="p">(</span><span class="n">button</span><span class="p">));</span><span class="w"></span>
<span class="w"> </span><span class="cm">/* Set the &quot;button&quot; class */</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_style_context_add_class</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">,</span><span class="w"> </span><span class="n">GTK_STYLE_CLASS_BUTTON</span><span class="p">);</span><span class="w"></span>
<span class="p">}</span><span class="w"></span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>
Or
</p>
<div class="example">
<a name="id-1.6.4.7.3.2.4"></a><p class="title"><b>Example 47. Using dynamic CSS classes for different elements</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
2
3
4
5
6
7
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9
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28</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="k">static</span><span class="w"> </span><span class="n">gboolean</span><span class="w"></span>
<span class="nf">gtk_spin_button_draw</span><span class="w"> </span><span class="p">(</span><span class="n">GtkSpinButton</span><span class="w"> </span><span class="o">*</span><span class="n">spin</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="n">cairo_t</span><span class="w"> </span><span class="o">*</span><span class="n">cr</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">GtkStyleContext</span><span class="w"> </span><span class="o">*</span><span class="n">context</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="w"> </span><span class="n">context</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">gtk_widget_get_style_context</span><span class="w"> </span><span class="p">(</span><span class="n">GTK_WIDGET</span><span class="w"> </span><span class="p">(</span><span class="n">spin</span><span class="p">));</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_style_context_save</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_style_context_add_class</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">,</span><span class="w"> </span><span class="n">GTK_STYLE_CLASS_ENTRY</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="cm">/* Call to entry draw impl with &quot;entry&quot; class */</span><span class="w"></span>
<span class="w"> </span><span class="n">parent_class</span><span class="o">-&gt;</span><span class="n">draw</span><span class="w"> </span><span class="p">(</span><span class="n">spin</span><span class="p">,</span><span class="w"> </span><span class="n">cr</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_style_context_restore</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_style_context_save</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="cm">/* Render up/down buttons with the &quot;button&quot; class */</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_style_context_add_class</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">,</span><span class="w"> </span><span class="n">GTK_STYLE_CLASS_BUTTON</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">draw_up_button</span><span class="w"> </span><span class="p">(</span><span class="n">spin</span><span class="p">,</span><span class="w"> </span><span class="n">cr</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">draw_down_button</span><span class="w"> </span><span class="p">(</span><span class="n">spin</span><span class="p">,</span><span class="w"> </span><span class="n">cr</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="n">gtk_style_context_restore</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="p">}</span><span class="w"></span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>
Note that <a class="link" href="GtkStyleContext.html" title="GtkStyleContext"><span class="type">GtkStyleContext</span></a> only provides fg/bg colors, so text/base
is done through distinctive theming of the different classes. For
example, an entry would usually be black on white while a button
would usually be black on light grey.
</p>
</li>
<li class="listitem">
<p>
Replace all <code class="literal">gtk_paint_*()</code> calls with corresponding
<code class="literal">gtk_render_*()</code> calls.
</p>
<p>
The most distinctive changes are the use of <a class="link" href="gtk3-Standard-Enumerations.html#GtkStateFlags" title="enum GtkStateFlags"><span class="type">GtkStateFlags</span></a> to
represent the widget state and the lack of <a class="link" href="gtk3-Standard-Enumerations.html#GtkShadowType" title="enum GtkShadowType"><span class="type">GtkShadowType</span></a>. Note
that widget state is now passed implicitly via the context, so
to render in a certain state, you have to temporarily set the
state on the context, as in the following example:
</p>
<div class="example">
<a name="id-1.6.4.7.3.3.3"></a><p class="title"><b>Example 48. Rendering with a specific state</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
2
3
4</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">gtk_style_context_save</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">);</span><span class="w"></span>
<span class="n">gtk_style_context_set_state</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">,</span><span class="w"> </span><span class="n">GTK_STATE_FLAG_ACTIVE</span><span class="p">);</span><span class="w"></span>
<span class="n">gtk_render_check</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">,</span><span class="w"> </span><span class="n">cr</span><span class="p">,</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="w"> </span><span class="n">y</span><span class="p">,</span><span class="w"> </span><span class="n">width</span><span class="p">,</span><span class="w"> </span><span class="n">height</span><span class="p">);</span><span class="w"></span>
<span class="n">gtk_style_context_restore</span><span class="w"> </span><span class="p">(</span><span class="n">context</span><span class="p">);</span><span class="w"></span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>
For <a class="link" href="GtkStyleContext.html#gtk-render-check" title="gtk_render_check ()"><code class="function">gtk_render_check()</code></a> and <a class="link" href="GtkStyleContext.html#gtk-render-option" title="gtk_render_option ()"><code class="function">gtk_render_option()</code></a>, the <em class="parameter"><code>shadow_type</code></em>
parameter is replaced by the <a class="link" href="gtk3-Standard-Enumerations.html#GTK-STATE-FLAG-ACTIVE:CAPS"><span class="type">GTK_STATE_FLAG_ACTIVE</span></a> and
<a class="link" href="gtk3-Standard-Enumerations.html#GTK-STATE-FLAG-INCONSISTENT:CAPS"><span class="type">GTK_STATE_FLAG_INCONSISTENT</span></a> state flags. For things such as
pressed/unpressed button states, <a class="link" href="gtk3-Standard-Enumerations.html#GTK-STATE-FLAG-ACTIVE:CAPS"><span class="type">GTK_STATE_FLAG_ACTIVE</span></a> is used,
and the CSS may style normal/active states differently to render
outset/inset borders, respectively.
</p>
</li>
<li class="listitem">
The various <code class="literal">gtk_widget_modify_*()</code> functions to
override colors or fonts for individual widgets have been replaced
by similar <code class="literal">gtk_widget_override_*()</code> functions.
</li>
<li class="listitem">
It is no longer necessary to call <a class="link" href="GtkWidget.html#gtk-widget-style-attach" title="gtk_widget_style_attach ()"><code class="function">gtk_widget_style_attach()</code></a>,
<a class="link" href="GtkStyle.html#gtk-style-attach" title="gtk_style_attach ()"><code class="function">gtk_style_attach()</code></a>, <a class="link" href="GtkStyle.html#gtk-style-detach" title="gtk_style_detach ()"><code class="function">gtk_style_detach()</code></a> or <a class="link" href="GtkWidget.html#gtk-widget-ensure-style" title="gtk_widget_ensure_style ()"><code class="function">gtk_widget_ensure_style()</code></a>.
</li>
<li class="listitem">
Replace all uses of xthickness/ythickness. <a class="link" href="GtkStyleContext.html" title="GtkStyleContext"><span class="type">GtkStyleContext</span></a> uses the
CSS box model, and there are border-width/padding/margin properties to
replace the different applications of X and Y thickness. Note that all
of this is merely a guideline. Widgets may choose to follow it or not.
</li>
</ol></div>
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