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<div class="chapter" title="Migrating from GnomeColorPicker to GtkColorButton">
<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">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="normal"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint">guint</a> red</span><span class="symbol">,</span><span class="normal"> green</span><span class="symbol">,</span><span class="normal"> blue</span><span class="symbol">,</span><span class="normal"> alpha</span><span class="symbol">;</span>
<span class="comment">/* ... */</span>
<span class="function"><a href="/usr/share/gtk-doc/html/libgnomeui/GnomeColorPicker.html#gnome-color-picker-set-i8">gnome_color_picker_set_i8</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">color_picker</span><span class="symbol">,</span><span class="normal"> red</span><span class="symbol">,</span><span class="normal"> green</span><span class="symbol">,</span><span class="normal"> blue</span><span class="symbol">,</span><span class="normal"> alpha</span><span class="symbol">);</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="normal"><a href="http://library.gnome.org/devel/gdk/unstable/gdk-Colormaps-and-Colors.html#GdkColor">GdkColor</a> color</span><span class="symbol">;</span>
<span class="normal">color</span><span class="symbol">.</span><span class="normal">red </span><span class="symbol">=</span><span class="normal"> red </span><span class="symbol"><<</span><span class="normal"> </span><span class="number">8</span><span class="symbol">;</span>
<span class="normal">color</span><span class="symbol">.</span><span class="normal">green </span><span class="symbol">=</span><span class="normal"> green </span><span class="symbol"><<</span><span class="normal"> </span><span class="number">8</span><span class="symbol">;</span>
<span class="normal">color</span><span class="symbol">.</span><span class="normal">blue </span><span class="symbol">=</span><span class="normal"> blue </span><span class="symbol"><<</span><span class="normal"> </span><span class="number">8</span><span class="symbol">;</span>
<span class="function"><a href="GtkColorButton.html#gtk-color-button-set-color">gtk_color_button_set_color</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">color_picker</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">color</span><span class="symbol">);</span>
<span class="function"><a href="GtkColorButton.html#gtk-color-button-set-alpha">gtk_color_button_set_alpha</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">color_picker</span><span class="symbol">,</span><span class="normal"> alpha </span><span class="symbol"><<</span><span class="normal"> </span><span class="number">8</span><span class="symbol">);</span></pre></td>
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</div>
<p>
and similarly for the setters taking other number formats. For
<code class="function"><a href="/usr/share/gtk-doc/html/libgnomeui/GnomeColorPicker.html#gnome-color-picker-set-i16"><code class="function">gnome_color_picker_set_i16()</code></a></code> no conversion is needed,
for <code class="function"><a href="/usr/share/gtk-doc/html/libgnomeui/GnomeColorPicker.html#gnome-color-picker-set-d"><code class="function">gnome_color_picker_set_d()</code></a></code>, you need to convert
the color components like this:
</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</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="normal">color</span><span class="symbol">.</span><span class="normal">red </span><span class="symbol">=</span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16">guint16</a></span><span class="symbol">)</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">red </span><span class="symbol">*</span><span class="normal"> </span><span class="number">65535.0</span><span class="normal"> </span><span class="symbol">+</span><span class="normal"> </span><span class="number">0.5</span><span class="symbol">);</span>
<span class="normal">color</span><span class="symbol">.</span><span class="normal">green </span><span class="symbol">=</span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16">guint16</a></span><span class="symbol">)</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">green </span><span class="symbol">*</span><span class="normal"> </span><span class="number">65535.0</span><span class="normal"> </span><span class="symbol">+</span><span class="normal"> </span><span class="number">0.5</span><span class="symbol">);</span>
<span class="normal">color</span><span class="symbol">.</span><span class="normal">blue </span><span class="symbol">=</span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint16">guint16</a></span><span class="symbol">)</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">blue </span><span class="symbol">*</span><span class="normal"> </span><span class="number">65535.0</span><span class="normal"> </span><span class="symbol">+</span><span class="normal"> </span><span class="number">0.5</span><span class="symbol">);</span></pre></td>
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