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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>glib.MainContext</title><link rel="stylesheet" type="text/css" href="style.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"><link rel="home" href="index.html" title="PyGObject Reference Manual"><link rel="up" href="glib-class-reference.html" title="PyGlibClass Reference"><link rel="prev" href="glib-class-reference.html" title="PyGlibClass Reference"><link rel="next" href="class-glibmainloop.html" title="glib.MainLoop"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">glib.MainContext</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glib-class-reference.html">Prev</a> </td><th width="60%" align="center">PyGlibClass Reference</th><td width="20%" align="right"> <a accesskey="n" href="class-glibmainloop.html">Next</a></td></tr></table><hr></div><div class="refentry" title="glib.MainContext"><a name="class-glibmaincontext"></a><div class="titlepage"></div><div class="refnamediv"><h2>glib.MainContext</h2><p>glib.MainContext — an object representing a set of event sources to be handled
in a <a class="link" href="class-glibmainloop.html" title="glib.MainLoop"><code class="classname">glib.MainLoop</code></a>.</p></div><div class="refsect1" title="Synopsis"><a name="id392555"></a><h2>Synopsis</h2><table bgcolor="#D0E0F0" width="100%"><tr><td><pre class="classsynopsis">class <span class="ooclass"><span class="classname">glib.MainContext</span></span>:
<code class="constructorsynopsis"> <span class="methodname"><a class="link" href="class-glibmaincontext.html#constructor-glibmaincontext" title="Constructor">glib.MainContext</a></span>()</code><br><code class="methodsynopsis"> def <span class="methodname"><a class="link" href="class-glibmaincontext.html#method-glibmaincontext--iteration" title="glib.MainContext.iteration">iteration</a></span>(<span class="methodparam"><span class="parameter"><em class="parameter"><code>may_block</code></em></span></span>)</code><br><code class="methodsynopsis"> def <span class="methodname"><a class="link" href="class-glibmaincontext.html#method-glibmaincontext--pending" title="glib.MainContext.pending">pending</a></span>()</code><br></pre></td></tr></table></div><div class="refsect1" title="Ancestry"><a name="id392487"></a><h2>Ancestry</h2><pre class="synopsis">+-- <a class="link" href="class-glibmaincontext.html" title="glib.MainContext">glib.MainContext</a>
</pre></div><div class="refsect1" title="Description"><a name="id392470"></a><h2>Description</h2><p>A <a class="link" href="class-glibmaincontext.html" title="glib.MainContext"><code class="classname">glib.MainContext</code></a>
represents a set of event sources that can be run in a single thread. File
descriptors (plain files, pipes or sockets) and timeouts are the standard
event sources for <code class="literal">GTK</code> and <code class="literal">PyGTK</code> though
others can be added. Each event source is assigned a priority. The default
priority, <code class="literal">glib.PRIORITY_DEFAULT</code>, is 0. Values less
than 0 denote higher priorities. Values greater than 0 denote lower
priorities. Events from high priority sources are always processed before
events from lower priority sources. Single iterations of a <a class="link" href="class-glibmaincontext.html" title="glib.MainContext"><code class="classname">glib.MainContext</code></a>
can be run with the <a class="link" href="class-glibmaincontext.html#method-glibmaincontext--iteration" title="glib.MainContext.iteration"><code class="methodname">iteration</code>()</a>
method.</p></div><div class="refsect1" title="Constructor"><a name="constructor-glibmaincontext"></a><h2>Constructor</h2><pre class="programlisting"><code class="constructorsynopsis"> <span class="methodname">glib.MainContext</span>()</code></pre><table border="0" width="100%" bgcolor="#FFECCE"><col align="left" valign="top" width="0*"><tbody><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td>a new <a class="link" href="class-glibmaincontext.html" title="glib.MainContext"><code class="classname">glib.MainContext</code></a>
object.</td></tr></tbody></table><p>Creates a new <a class="link" href="class-glibmaincontext.html" title="glib.MainContext"><code class="classname">glib.MainContext</code></a>
object.</p></div><div class="refsect1" title="Methods"><a name="id392378"></a><h2>Methods</h2><div class="refsect2" title="glib.MainContext.iteration"><a name="method-glibmaincontext--iteration"></a><h3>glib.MainContext.iteration</h3><pre class="programlisting"><code class="methodsynopsis"> def <span class="methodname">iteration</span>()</code></pre><table border="0" width="100%" bgcolor="#FFECCE"><col align="left" valign="top" width="0*"><tbody><tr><td><p><span class="term"><em class="parameter"><code>may_block</code></em> :</span></p></td><td>if <code class="literal">True</code> the call may block
waiting for an event.</td></tr><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td><code class="literal">True</code> if events were
dispatched.</td></tr></tbody></table><p>The <code class="methodname">iteration</code>() method runs a single
iteration. This involves:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">checking to see if any associated event sources are ready
to be processed;</li><li class="listitem">then if no events sources are ready and
<em class="parameter"><code>may_block</code></em> is <code class="literal">True</code>, waiting for a
source to become ready;</li><li class="listitem">and finally, dispatching the highest priority events
sources that are ready</li></ul></div><p>Note that even when <em class="parameter"><code>may_block</code></em> is
<code class="literal">True</code>, it is still possible for
<code class="methodname">iteration</code>() to return <code class="literal">False</code>,
since the the wait may be interrupted for other reasons than an event source
becoming ready.</p></div><div class="refsect2" title="glib.MainContext.pending"><a name="method-glibmaincontext--pending"></a><h3>glib.MainContext.pending</h3><pre class="programlisting"><code class="methodsynopsis"> def <span class="methodname">pending</span>()</code></pre><table border="0" width="100%" bgcolor="#FFECCE"><col align="left" valign="top" width="0*"><tbody><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td><code class="literal">True</code> if events are
pending.</td></tr></tbody></table><p>The <code class="methodname">pending</code>() method checks if any
associated sources have pending events.</p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="glib-class-reference.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="glib-class-reference.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="class-glibmainloop.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">PyGlibClass Reference </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> glib.MainLoop</td></tr></table></div></body></html>
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