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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>RBPlayOrder: Rhythmbox Development Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="Rhythmbox Development Reference Manual">
<link rel="up" href="ch05.html" title="Shell">
<link rel="prev" href="RBHistory.html" title="RBHistory">
<link rel="next" href="RBRandomPlayOrder.html" title="RBRandomPlayOrder">
<meta name="generator" content="GTK-Doc V1.27 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#RBPlayOrder.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#RBPlayOrder.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties">  <span class="dim">|</span> 
                  <a href="#RBPlayOrder.properties" class="shortcut">Properties</a></span><span id="nav_signals">  <span class="dim">|</span> 
                  <a href="#RBPlayOrder.signals" class="shortcut">Signals</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="ch05.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="RBHistory.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="RBRandomPlayOrder.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="RBPlayOrder"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="RBPlayOrder.top_of_page"></a>RBPlayOrder</span></h2>
<p>RBPlayOrder — base class for play order implementations</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="RBPlayOrder.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">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-playing-source-changed" title="rb_play_order_playing_source_changed ()">rb_play_order_playing_source_changed</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="RBPlayOrder.html#rb-play-order-query-model-changed" title="rb_play_order_query_model_changed ()">rb_play_order_query_model_changed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-has-next" title="rb_play_order_has_next ()">rb_play_order_has_next</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">RhythmDBEntry</span> *
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-get-next" title="rb_play_order_get_next ()">rb_play_order_get_next</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="RBPlayOrder.html#rb-play-order-go-next" title="rb_play_order_go_next ()">rb_play_order_go_next</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-has-previous" title="rb_play_order_has_previous ()">rb_play_order_has_previous</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">RhythmDBEntry</span> *
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-get-previous" title="rb_play_order_get_previous ()">rb_play_order_get_previous</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="RBPlayOrder.html#rb-play-order-go-previous" title="rb_play_order_go_previous ()">rb_play_order_go_previous</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="RBPlayOrder.html#rb-play-order-set-playing-entry" title="rb_play_order_set_playing_entry ()">rb_play_order_set_playing_entry</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">RhythmDBEntry</span> *
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-get-playing-entry" title="rb_play_order_get_playing_entry ()">rb_play_order_get_playing_entry</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="RBShellPlayer.html" title="RBShellPlayer"><span class="returnvalue">RBShellPlayer</span></a> *
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-get-player" title="rb_play_order_get_player ()">rb_play_order_get_player</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="RBSource.html" title="RBSource"><span class="returnvalue">RBSource</span></a> *
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-get-source" title="rb_play_order_get_source ()">rb_play_order_get_source</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="RhythmDB.html" title="RhythmDB"><span class="returnvalue">RhythmDB</span></a> *
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-get-db" title="rb_play_order_get_db ()">rb_play_order_get_db</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="RhythmDBQueryModel.html" title="RhythmDBQueryModel"><span class="returnvalue">RhythmDBQueryModel</span></a> *
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-get-query-model" title="rb_play_order_get_query_model ()">rb_play_order_get_query_model</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-model-not-empty" title="rb_play_order_model_not_empty ()">rb_play_order_model_not_empty</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBPlayOrder.html#rb-play-order-player-is-playing" title="rb_play_order_player_is_playing ()">rb_play_order_player_is_playing</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="RBPlayOrder.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type">
<a class="link" href="RBShellPlayer.html" title="RBShellPlayer"><span class="type">RBShellPlayer</span></a> *</td>
<td class="property_name"><a class="link" href="RBPlayOrder.html#RBPlayOrder--player" title="The “player” property">player</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
<tr>
<td class="property_type">
<span class="type">RhythmDBEntry</span> *</td>
<td class="property_name"><a class="link" href="RBPlayOrder.html#RBPlayOrder--playing-entry" title="The “playing-entry” property">playing-entry</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="RBPlayOrder.signals"></a><h2>Signals</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody><tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="RBPlayOrder.html#RBPlayOrder-have-next-previous-changed" title="The “have-next-previous-changed” signal">have-next-previous-changed</a></td>
<td class="signal_flags"><a href="../gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="RBPlayOrder.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">struct</td>
<td class="function_name"><a class="link" href="RBPlayOrder.html#RBPlayOrder-struct" title="struct RBPlayOrder">RBPlayOrder</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="RBPlayOrder.html#RBPlayOrderClass" title="struct RBPlayOrderClass">RBPlayOrderClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="RBPlayOrder.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="../gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> RBPlayOrder
        <span class="lineart">╰──</span> <a class="link" href="RBRandomPlayOrder.html" title="RBRandomPlayOrder">RBRandomPlayOrder</a>
</pre>
</div>
<div class="refsect1">
<a name="RBPlayOrder.description"></a><h2>Description</h2>
<p>A play order defines an ordering of the entries from a <a class="link" href="RhythmDBQueryModel.html" title="RhythmDBQueryModel"><span class="type">RhythmDBQueryModel</span></a> that
the <a class="link" href="RBShellPlayer.html" title="RBShellPlayer"><span class="type">RBShellPlayer</span></a> uses to get the next or previous entry to play.</p>
<p>Play order methods are invoked when changes are made to the query model, when
the query model is replaced, the playing source is changed, or a new playing
entry is selected.</p>
<p>The play order must implement methods to check for, retrieve, and move to the
next and previous entries in the play order.  Only the go_next and go_previous
methods actually change anything.</p>
<p>The play order should also emit the have-next-previous-changed signal to hint that
the availability of either a next or previous entry in the order may have changed.
This information is used to update the sensitivity of the next and previous buttons.</p>
</div>
<div class="refsect1">
<a name="RBPlayOrder.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="rb-play-order-playing-source-changed"></a><h3>rb_play_order_playing_source_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_play_order_playing_source_changed (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>,
                                      <em class="parameter"><code><a class="link" href="RBSource.html" title="RBSource"><span class="type">RBSource</span></a> *source</code></em>);</pre>
<p>Sets the playing <a class="link" href="RBSource.html" title="RBSource"><span class="type">RBSource</span></a> for the play order.  Should be called
by <a class="link" href="RBShellPlayer.html" title="RBShellPlayer"><span class="type">RBShellPlayer</span></a> when the active source changes.  Subclasses
should implement <code class="function">playing_source_changed()</code> to make any necessary
changes.</p>
<div class="refsect3">
<a name="rb-play-order-playing-source-changed.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>porder</p></td>
<td class="parameter_description"><p><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>source</p></td>
<td class="parameter_description"><p>New playing <a class="link" href="RBSource.html" title="RBSource"><span class="type">RBSource</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-query-model-changed"></a><h3>rb_play_order_query_model_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_play_order_query_model_changed (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Updates the <a class="link" href="RhythmDBQueryModel.html" title="RhythmDBQueryModel"><span class="type">RhythmDBQueryModel</span></a> instance for the play order.
Called from the <a class="link" href="RBSource.html" title="RBSource"><span class="type">RBSource</span></a> notify signal handler, and also from
<span class="type">rb_play_order_source_changed</span>.  Subclasses should implement
<code class="function">query_model_changed()</code> to make any necessary adjustments if they
store any state based on the contents of the <a class="link" href="RhythmDBQueryModel.html" title="RhythmDBQueryModel"><span class="type">RhythmDBQueryModel</span></a>.</p>
<div class="refsect3">
<a name="rb-play-order-query-model-changed.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>porder</p></td>
<td class="parameter_description"><p>RBPlayOrder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-has-next"></a><h3>rb_play_order_has_next ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_play_order_has_next (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>If there is no current playing entry, returns true if the play order is non-empty.</p>
<div class="refsect3">
<a name="rb-play-order-has-next.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>porder</p></td>
<td class="parameter_description"><p>RBPlayOrder instance.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-has-next.returns"></a><h4>Returns</h4>
<p> true if there is an entry after the current playing entry in the play order.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-get-next"></a><h3>rb_play_order_get_next ()</h3>
<pre class="programlisting"><span class="returnvalue">RhythmDBEntry</span> *
rb_play_order_get_next (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Returns the next entry in the play order, or the first if not currently playing.</p>
<div class="refsect3">
<a name="rb-play-order-get-next.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>porder</p></td>
<td class="parameter_description"><p>RBPlayOrder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-get-next.returns"></a><h4>Returns</h4>
<p>next entry to play. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20full"><span class="acronym">transfer full</span></a>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-go-next"></a><h3>rb_play_order_go_next ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_play_order_go_next (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Moves to the next entry in the play order.  If not currently playing, sets the
first entry in the play order as the playing entry.</p>
<div class="refsect3">
<a name="rb-play-order-go-next.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>porder</p></td>
<td class="parameter_description"><p>RBPlayOrder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-has-previous"></a><h3>rb_play_order_has_previous ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_play_order_has_previous (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Returns <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if there is an entry before the current entry in the play order.
If not currently playing, returns <a href="../glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p>
<div class="refsect3">
<a name="rb-play-order-has-previous.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>porder</p></td>
<td class="parameter_description"><p>RBPlayOrder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-has-previous.returns"></a><h4>Returns</h4>
<p> <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if previous entry exists</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-get-previous"></a><h3>rb_play_order_get_previous ()</h3>
<pre class="programlisting"><span class="returnvalue">RhythmDBEntry</span> *
rb_play_order_get_previous (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Returns the previous entry in the play order, or NULL if not currently playing.</p>
<div class="refsect3">
<a name="rb-play-order-get-previous.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>porder</p></td>
<td class="parameter_description"><p>RBPlayOrder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-get-previous.returns"></a><h4>Returns</h4>
<p>previous entry. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20full"><span class="acronym">transfer full</span></a>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-go-previous"></a><h3>rb_play_order_go_previous ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_play_order_go_previous (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Moves to the previous entry in the play order.  If not currently playing, does nothing.</p>
<div class="refsect3">
<a name="rb-play-order-go-previous.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>porder</p></td>
<td class="parameter_description"><p>RBPlayOrder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-set-playing-entry"></a><h3>rb_play_order_set_playing_entry ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_play_order_set_playing_entry (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>,
                                 <em class="parameter"><code><span class="type">RhythmDBEntry</span> *entry</code></em>);</pre>
<p>Sets the playing entry in the play order.</p>
<div class="refsect3">
<a name="rb-play-order-set-playing-entry.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>porder</p></td>
<td class="parameter_description"><p><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>entry</p></td>
<td class="parameter_description"><p>The new playing entry (or NULL for none). </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/transfer%20none"><span class="acronym">transfer none</span></a>][<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-get-playing-entry"></a><h3>rb_play_order_get_playing_entry ()</h3>
<pre class="programlisting"><span class="returnvalue">RhythmDBEntry</span> *
rb_play_order_get_playing_entry (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Returns the current playing entry in the play order.</p>
<div class="refsect3">
<a name="rb-play-order-get-playing-entry.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>porder</p></td>
<td class="parameter_description"><p><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-get-playing-entry.returns"></a><h4>Returns</h4>
<p>playing entry. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20full"><span class="acronym">transfer full</span></a>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-get-player"></a><h3>rb_play_order_get_player ()</h3>
<pre class="programlisting"><a class="link" href="RBShellPlayer.html" title="RBShellPlayer"><span class="returnvalue">RBShellPlayer</span></a> *
rb_play_order_get_player (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Only for use by <a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> subclasses.</p>
<div class="refsect3">
<a name="rb-play-order-get-player.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>porder</p></td>
<td class="parameter_description"><p><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-get-player.returns"></a><h4>Returns</h4>
<p><a class="link" href="RBShellPlayer.html" title="RBShellPlayer"><span class="type">RBShellPlayer</span></a> instance. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20none"><span class="acronym">transfer none</span></a>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-get-source"></a><h3>rb_play_order_get_source ()</h3>
<pre class="programlisting"><a class="link" href="RBSource.html" title="RBSource"><span class="returnvalue">RBSource</span></a> *
rb_play_order_get_source (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Only for use by <a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> subclasses.</p>
<div class="refsect3">
<a name="rb-play-order-get-source.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>porder</p></td>
<td class="parameter_description"><p><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-get-source.returns"></a><h4>Returns</h4>
<p>the playing <a class="link" href="RBSource.html" title="RBSource"><span class="type">RBSource</span></a> instance. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20none"><span class="acronym">transfer none</span></a>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-get-db"></a><h3>rb_play_order_get_db ()</h3>
<pre class="programlisting"><a class="link" href="RhythmDB.html" title="RhythmDB"><span class="returnvalue">RhythmDB</span></a> *
rb_play_order_get_db (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Only for use by <a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> subclasses.</p>
<div class="refsect3">
<a name="rb-play-order-get-db.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>porder</p></td>
<td class="parameter_description"><p><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-get-db.returns"></a><h4>Returns</h4>
<p>the <a class="link" href="RhythmDB.html" title="RhythmDB"><span class="type">RhythmDB</span></a> instance. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20none"><span class="acronym">transfer none</span></a>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-get-query-model"></a><h3>rb_play_order_get_query_model ()</h3>
<pre class="programlisting"><a class="link" href="RhythmDBQueryModel.html" title="RhythmDBQueryModel"><span class="returnvalue">RhythmDBQueryModel</span></a> *
rb_play_order_get_query_model (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Only for use by <a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> subclasses.</p>
<div class="refsect3">
<a name="rb-play-order-get-query-model.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>porder</p></td>
<td class="parameter_description"><p><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-get-query-model.returns"></a><h4>Returns</h4>
<p>the active <a class="link" href="RhythmDBQueryModel.html" title="RhythmDBQueryModel"><span class="type">RhythmDBQueryModel</span></a> for the playing source. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20none"><span class="acronym">transfer none</span></a>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-model-not-empty"></a><h3>rb_play_order_model_not_empty ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_play_order_model_not_empty (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Returns <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the <a class="link" href="RhythmDBQueryModel.html" title="RhythmDBQueryModel"><span class="type">RhythmDBQueryModel</span></a> is not empty.
Can be used to implement has_next and has_previous for play orders
that have no beginning or end.</p>
<div class="refsect3">
<a name="rb-play-order-model-not-empty.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>porder</p></td>
<td class="parameter_description"><p>RBPlayOrder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-model-not-empty.returns"></a><h4>Returns</h4>
<p> <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if not empty</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-play-order-player-is-playing"></a><h3>rb_play_order_player_is_playing ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_play_order_player_is_playing (<em class="parameter"><code><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder</code></em>);</pre>
<p>Returns <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if there is a current playing entry in the play order.</p>
<div class="refsect3">
<a name="rb-play-order-player-is-playing.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>porder</p></td>
<td class="parameter_description"><p><a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-play-order-player-is-playing.returns"></a><h4>Returns</h4>
<p> <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if playing</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="RBPlayOrder.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="RBPlayOrder-struct"></a><h3>struct RBPlayOrder</h3>
<pre class="programlisting">struct RBPlayOrder;</pre>
</div>
<hr>
<div class="refsect2">
<a name="RBPlayOrderClass"></a><h3>struct RBPlayOrderClass</h3>
<pre class="programlisting">struct RBPlayOrderClass {
	GObjectClass parent_class;

	/* EVENTS */
	void (*playing_source_changed) (RBPlayOrder *porder);
	void (*db_changed) (RBPlayOrder *porder, RhythmDB *new_db);
	void (*playing_entry_changed) (RBPlayOrder *porder, RhythmDBEntry *old_entry, RhythmDBEntry *new_entry);
	void (*entry_added) (RBPlayOrder *porder, RhythmDBEntry *entry);
	void (*entry_removed) (RBPlayOrder *porder, RhythmDBEntry *entry);
	void (*query_model_changed) (RBPlayOrder *porder);
	void (*db_entry_deleted) (RBPlayOrder *porder, RhythmDBEntry *entry);
	void (*playing_entry_removed) (RBPlayOrder *porder, RhythmDBEntry *entry);

	/* QUERIES */
	/*
	 * Returns whether there is a next song. This controls the next
	 * button's sensitivity. If not implemented, defaults to
	 * get_next()!=NULL.
	 *
	 * Must not change any visible state.
	 */
	gboolean (*has_next) (RBPlayOrder* porder);
	/*
	 * get_next() must return the next song to play. It's called when a
	 * song finishes, when the user clicks the next button, and when the
	 * user clicks play after playback is stopped.
	 *
	 * get_next() is also used to find the first song. You can figure out
	 * whether the player is currently playing by calling
	 * rb_play_order_player_is_playing(porder).
	 *
	 * Must not change any visible state.
	 */
	RhythmDBEntry* (*get_next) (RBPlayOrder* porder);
	/*
	 * Tells the play order that the user has moved to the next song.
	 * Should be called before the EntryView::playing-entry property is
	 * changed.
	 */
	void (*go_next) (RBPlayOrder* porder);
	/*
	 * Returns whether there is a previous song. This controls the previous
	 * button's sensitivity. If not implemented, defaults to
	 * get_previous()!=NULL.
	 *
	 * Must not change any visible state.
	 */
	gboolean (*has_previous) (RBPlayOrder* porder);
	/*
	 * get_previous() must return the previous song to play. It's called
	 * when the user clicks the previous button within 2 seconds of the
	 * beginning of a song.
	 *
	 * Must not change any visible state.
	 */
	RhythmDBEntry* (*get_previous) (RBPlayOrder* porder);
	/*
	 * Tells the play order that the user has moved to the previous song.
	 * Should be called before the EntryView::playing-entry property is
	 * changed.
	 */
	void (*go_previous) (RBPlayOrder* porder);

	/* SIGNALS */
	void (*have_next_previous_changed) (RBPlayOrder *porder, gboolean have_next, gboolean have_previous);
};
</pre>
</div>
</div>
<div class="refsect1">
<a name="RBPlayOrder.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="RBPlayOrder--player"></a><h3>The <code class="literal">“player”</code> property</h3>
<pre class="programlisting">  “player”                   <a class="link" href="RBShellPlayer.html" title="RBShellPlayer"><span class="type">RBShellPlayer</span></a> *</pre>
<p>The <a class="link" href="RBShellPlayer.html" title="RBShellPlayer"><span class="type">RBShellPlayer</span></a> instance</p>
<p>Flags: Read / Write / Construct Only</p>
</div>
<hr>
<div class="refsect2">
<a name="RBPlayOrder--playing-entry"></a><h3>The <code class="literal">“playing-entry”</code> property</h3>
<pre class="programlisting">  “playing-entry”            <span class="type">RhythmDBEntry</span> *</pre>
<p>The current playing <span class="type">RhythmDBEntry</span></p>
<p>Flags: Read / Write</p>
</div>
</div>
<div class="refsect1">
<a name="RBPlayOrder.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="RBPlayOrder-have-next-previous-changed"></a><h3>The <code class="literal">“have-next-previous-changed”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a> *porder,
               <a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>     have_next,
               <a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>     have_previous,
               <a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>     user_data)</pre>
<p>Emitted as a hint to suggest that the sensitivity of next/previous
buttons may need to be updated.</p>
<div class="refsect3">
<a name="RBPlayOrder-have-next-previous-changed.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>porder</p></td>
<td class="parameter_description"><p>the <a class="link" href="RBPlayOrder.html" title="RBPlayOrder"><span class="type">RBPlayOrder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>have_next</p></td>
<td class="parameter_description"><p>if <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, the play order has at least one more entry</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>have_previous</p></td>
<td class="parameter_description"><p>if <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, the play order has at least one entry
before the current entry</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: <a href="../gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p>
</div>
</div>
</div>
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