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<title>rb-rating-helper: Rhythmbox Development Reference Manual</title>
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<a href="#rhythmbox-rb-rating-helper.description" class="shortcut">Description</a></span>
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<a name="rhythmbox-rb-rating-helper"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="rhythmbox-rb-rating-helper.top_of_page"></a>rb-rating-helper</span></h2>
<p>rb-rating-helper — helper functions for displaying song ratings</p>
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<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="rhythmbox-rb-rating-helper.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="rhythmbox-rb-rating-helper.html#rb-rating-render-stars" title="rb_rating_render_stars ()">rb_rating_render_stars</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">double</span>
</td>
<td class="function_name">
<a class="link" href="rhythmbox-rb-rating-helper.html#rb-rating-get-rating-from-widget" title="rb_rating_get_rating_from_widget ()">rb_rating_get_rating_from_widget</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="rhythmbox-rb-rating-helper.html#rb-rating-pixbufs-free" title="rb_rating_pixbufs_free ()">rb_rating_pixbufs_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
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<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="rhythmbox-rb-rating-helper.html#rb-rating-install-rating-property" title="rb_rating_install_rating_property ()">rb_rating_install_rating_property</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="rhythmbox-rb-rating-helper.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="rhythmbox-rb-rating-helper.html#RBRatingPixbufs" title="RBRatingPixbufs">RBRatingPixbufs</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="rhythmbox-rb-rating-helper.html#RB-RATING-MAX-SCORE:CAPS" title="RB_RATING_MAX_SCORE">RB_RATING_MAX_SCORE</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="rhythmbox-rb-rating-helper.description"></a><h2>Description</h2>
<p>A few helper functions for dealing with ratings. These are shared
between <a class="link" href="RBRating.html" title="RBRating"><span class="type">RBRating</span></a> and <a class="link" href="RBCellRendererRating.html" title="RBCellRendererRating"><span class="type">RBCellRendererRating</span></a>.</p>
</div>
<div class="refsect1">
<a name="rhythmbox-rb-rating-helper.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="rb-rating-render-stars"></a><h3>rb_rating_render_stars ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_rating_render_stars (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gtk3/GtkWidget.html#GtkWidget-struct"><span class="type">GtkWidget</span></a> *widget</code></em>,
<em class="parameter"><code><span class="type">cairo_t</span> *cr</code></em>,
<em class="parameter"><code><a class="link" href="rhythmbox-rb-rating-helper.html#RBRatingPixbufs" title="RBRatingPixbufs"><span class="type">RBRatingPixbufs</span></a> *pixbufs</code></em>,
<em class="parameter"><code><span class="type">int</span> x</code></em>,
<em class="parameter"><code><span class="type">int</span> y</code></em>,
<em class="parameter"><code><span class="type">int</span> x_offset</code></em>,
<em class="parameter"><code><span class="type">int</span> y_offset</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> rating</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> selected</code></em>);</pre>
<p>Renders a rating as a row of stars. floor(<em class="parameter"><code>rating</code></em>
) large stars
are drawn, followed by 5-floor(<em class="parameter"><code>rating</code></em>
) small stars.</p>
<div class="refsect3">
<a name="rb-rating-render-stars.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>widget</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gtk3/GtkWidget.html#GtkWidget-struct"><span class="type">GtkWidget</span></a> to render on behalf of</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cr</p></td>
<td class="parameter_description"><p>cairo context to render into</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>pixbufs</p></td>
<td class="parameter_description"><p>a <a class="link" href="rhythmbox-rb-rating-helper.html#RBRatingPixbufs" title="RBRatingPixbufs"><span class="type">RBRatingPixbufs</span></a> structure</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x</p></td>
<td class="parameter_description"><p>source X coordinate within the rating pixbufs (usually 0)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y</p></td>
<td class="parameter_description"><p>source Y coordinate within the rating pixbufs (usually 0)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>x_offset</p></td>
<td class="parameter_description"><p>destination X coordinate within the window</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>y_offset</p></td>
<td class="parameter_description"><p>destination Y coordinate within the window</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>rating</p></td>
<td class="parameter_description"><p>the rating to display (between 0.0 and 5.0)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>selected</p></td>
<td class="parameter_description"><p>TRUE if the widget is currently selected for input</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-rating-render-stars.returns"></a><h4>Returns</h4>
<p> TRUE if the stars were drawn successfully</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-rating-get-rating-from-widget"></a><h3>rb_rating_get_rating_from_widget ()</h3>
<pre class="programlisting"><span class="returnvalue">double</span>
rb_rating_get_rating_from_widget (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gtk3/GtkWidget.html#GtkWidget-struct"><span class="type">GtkWidget</span></a> *widget</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> widget_x</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> widget_width</code></em>,
<em class="parameter"><code><span class="type">double</span> current_rating</code></em>);</pre>
<p>Updates the rating for a widget after the user clicks on the
rating. If the user clicks on the Nth star, the rating is set
to N, unless the rating is already N, in which case the rating is
set to N-1. This allows the user to set the rating to 0.</p>
<div class="refsect3">
<a name="rb-rating-get-rating-from-widget.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>widget</p></td>
<td class="parameter_description"><p>the <a href="/usr/share/gtk-doc/html/gtk3/GtkWidget.html#GtkWidget-struct"><span class="type">GtkWidget</span></a> displaying the rating</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>widget_x</p></td>
<td class="parameter_description"><p>x component of the position to query</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>widget_width</p></td>
<td class="parameter_description"><p>width of the widget</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>current_rating</p></td>
<td class="parameter_description"><p>the current rating displayed in the widget</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-rating-get-rating-from-widget.returns"></a><h4>Returns</h4>
<p> the updated rating</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-rating-pixbufs-free"></a><h3>rb_rating_pixbufs_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_rating_pixbufs_free (<em class="parameter"><code><a class="link" href="rhythmbox-rb-rating-helper.html#RBRatingPixbufs" title="RBRatingPixbufs"><span class="type">RBRatingPixbufs</span></a> *pixbufs</code></em>);</pre>
<p>Frees a set of rating pixbufs.</p>
<div class="refsect3">
<a name="rb-rating-pixbufs-free.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>pixbufs</p></td>
<td class="parameter_description"><p><a class="link" href="rhythmbox-rb-rating-helper.html#RBRatingPixbufs" title="RBRatingPixbufs"><span class="type">RBRatingPixbufs</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-rating-install-rating-property"></a><h3>rb_rating_install_rating_property ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_rating_install_rating_property (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObjectClass"><span class="type">GObjectClass</span></a> *klass</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> prop</code></em>);</pre>
<p>Installs a 'rating' property in the specified class.</p>
<div class="refsect3">
<a name="rb-rating-install-rating-property.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>klass</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObjectClass"><span class="type">GObjectClass</span></a> to add the property to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>prop</p></td>
<td class="parameter_description"><p>property index to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="rhythmbox-rb-rating-helper.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="RBRatingPixbufs"></a><h3>RBRatingPixbufs</h3>
<pre class="programlisting">typedef struct _RBRatingPixbufs RBRatingPixbufs;</pre>
</div>
<hr>
<div class="refsect2">
<a name="RB-RATING-MAX-SCORE:CAPS"></a><h3>RB_RATING_MAX_SCORE</h3>
<pre class="programlisting">#define RB_RATING_MAX_SCORE 5
</pre>
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