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<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>
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<td class="listing_code"><pre class="programlisting">guint red<span class="gtkdoc opt">,</span> green<span class="gtkdoc opt">,</span> blue<span class="gtkdoc opt">,</span> alpha<span class="gtkdoc opt">;</span>
<span class="comment">/* ... */</span>
<span class="function">gnome_color_picker_set_i8</span> <span class="gtkdoc opt">(</span>color_picker<span class="gtkdoc opt">,</span> red<span class="gtkdoc opt">,</span> green<span class="gtkdoc opt">,</span> blue<span class="gtkdoc opt">,</span> alpha<span class="gtkdoc opt">);</span></pre></td>
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<p>
you have to write
</p>
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<td class="listing_code"><pre class="programlisting">GdkColor color<span class="gtkdoc opt">;</span>
color<span class="gtkdoc opt">.</span>red <span class="gtkdoc opt">=</span> red <span class="gtkdoc opt"><<</span> <span class="number">8</span><span class="gtkdoc opt">;</span>
color<span class="gtkdoc opt">.</span>green <span class="gtkdoc opt">=</span> green <span class="gtkdoc opt"><<</span> <span class="number">8</span><span class="gtkdoc opt">;</span>
color<span class="gtkdoc opt">.</span>blue <span class="gtkdoc opt">=</span> blue <span class="gtkdoc opt"><<</span> <span class="number">8</span><span class="gtkdoc opt">;</span>
<span class="function"><a href="GtkColorButton.html#gtk-color-button-set-color">gtk_color_button_set_color</a></span> <span class="gtkdoc opt">(</span>color_picker<span class="gtkdoc opt">, &</span>color<span class="gtkdoc opt">);</span>
<span class="function"><a href="GtkColorButton.html#gtk-color-button-set-alpha">gtk_color_button_set_alpha</a></span> <span class="gtkdoc opt">(</span>color_picker<span class="gtkdoc opt">,</span> alpha <span class="gtkdoc opt"><<</span> <span class="number">8</span><span class="gtkdoc opt">);</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:
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<td class="listing_code"><pre class="programlisting">color<span class="gtkdoc opt">.</span>red <span class="gtkdoc opt">= (</span>guint16<span class="gtkdoc opt">) (</span>red <span class="gtkdoc opt">*</span> <span class="number">65535.0</span> <span class="gtkdoc opt">+</span> <span class="number">0.5</span><span class="gtkdoc opt">);</span>
color<span class="gtkdoc opt">.</span>green <span class="gtkdoc opt">= (</span>guint16<span class="gtkdoc opt">) (</span>green <span class="gtkdoc opt">*</span> <span class="number">65535.0</span> <span class="gtkdoc opt">+</span> <span class="number">0.5</span><span class="gtkdoc opt">);</span>
color<span class="gtkdoc opt">.</span>blue <span class="gtkdoc opt">= (</span>guint16<span class="gtkdoc opt">) (</span>blue <span class="gtkdoc opt">*</span> <span class="number">65535.0</span> <span class="gtkdoc opt">+</span> <span class="number">0.5</span><span class="gtkdoc opt">);</span></pre></td>
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