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<title>Migrating from GnomeColorPicker to GtkColorButton: GTK+ 2 Reference Manual</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="gtk-migrating-GtkColorButton"></a>Migrating from GnomeColorPicker to GtkColorButton</h2></div></div></div>
<p>
Since version 2.6, GTK+ provides the <a class="link" href="GtkColorButton.html" title="GtkColorButton"><span class="type">GtkColorButton</span></a>
widget as a replacement for the <span class="structname">GnomeColorPicker</span>
widget in the libgnomeui library.
</p>
<p>
Porting an application from <span class="structname">GnomeColorPicker</span> to
<span class="structname">GtkColorButton</span> is very simple.
<span class="structname">GtkColorButton</span> doesn't support dithering
(since it is rarely needed on modern hardware), and it doesn't have
setters and getters to set the color from floating point or integer
components. So instead of
</p>
<div class="informalexample">
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<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">guint</span> <span class="n">red</span><span class="p">,</span> <span class="n">green</span><span class="p">,</span> <span class="n">blue</span><span class="p">,</span> <span class="n">alpha</span><span class="p">;</span>
<span class="cm">/* ... */</span>
<span class="n">gnome_color_picker_set_i8</span> <span class="p">(</span><span class="n">color_picker</span><span class="p">,</span> <span class="n">red</span><span class="p">,</span> <span class="n">green</span><span class="p">,</span> <span class="n">blue</span><span class="p">,</span> <span class="n">alpha</span><span class="p">);</span></pre></td>
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<p>
you have to write
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
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<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">GdkColor</span> <span class="n">color</span><span class="p">;</span>
<span class="n">color</span><span class="p">.</span><span class="n">red</span> <span class="o">=</span> <span class="n">red</span> <span class="o"><<</span> <span class="mi">8</span><span class="p">;</span>
<span class="n">color</span><span class="p">.</span><span class="n">green</span> <span class="o">=</span> <span class="n">green</span> <span class="o"><<</span> <span class="mi">8</span><span class="p">;</span>
<span class="n">color</span><span class="p">.</span><span class="n">blue</span> <span class="o">=</span> <span class="n">blue</span> <span class="o"><<</span> <span class="mi">8</span><span class="p">;</span>
<span class="n">gtk_color_button_set_color</span> <span class="p">(</span><span class="n">color_picker</span><span class="p">,</span> <span class="o">&</span><span class="n">color</span><span class="p">);</span>
<span class="n">gtk_color_button_set_alpha</span> <span class="p">(</span><span class="n">color_picker</span><span class="p">,</span> <span class="n">alpha</span> <span class="o"><<</span> <span class="mi">8</span><span class="p">);</span></pre></td>
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<p>
and similarly for the setters taking other number formats. For
<code class="function"><code class="function">gnome_color_picker_set_i16()</code></code> no conversion is needed,
for <code class="function"><code class="function">gnome_color_picker_set_d()</code></code>, you need to convert
the color components like this:
</p>
<div class="informalexample">
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<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">color</span><span class="p">.</span><span class="n">red</span> <span class="o">=</span> <span class="p">(</span><span class="n">guint16</span><span class="p">)</span> <span class="p">(</span><span class="n">red</span> <span class="o">*</span> <span class="mf">65535.0</span> <span class="o">+</span> <span class="mf">0.5</span><span class="p">);</span>
<span class="n">color</span><span class="p">.</span><span class="n">green</span> <span class="o">=</span> <span class="p">(</span><span class="n">guint16</span><span class="p">)</span> <span class="p">(</span><span class="n">green</span> <span class="o">*</span> <span class="mf">65535.0</span> <span class="o">+</span> <span class="mf">0.5</span><span class="p">);</span>
<span class="n">color</span><span class="p">.</span><span class="n">blue</span> <span class="o">=</span> <span class="p">(</span><span class="n">guint16</span><span class="p">)</span> <span class="p">(</span><span class="n">blue</span> <span class="o">*</span> <span class="mf">65535.0</span> <span class="o">+</span> <span class="mf">0.5</span><span class="p">);</span></pre></td>
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