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<?xml version="1.0" standalone="no"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<refentry id="class-glibmaincontext">
<refnamediv>
<refname>glib.MainContext</refname>
<refpurpose>an object representing a set of event sources to be handled
in a <link
linkend="class-glibmainloop"><classname>glib.MainLoop</classname></link>.</refpurpose>
</refnamediv>
<refsect1>
<title>Synopsis</title>
<classsynopsis language="python">
<ooclass><classname>glib.MainContext</classname></ooclass>
<constructorsynopsis language="python">
<methodname><link linkend="constructor-glibmaincontext">glib.MainContext</link></methodname>
</constructorsynopsis>
<methodsynopsis language="python">
<methodname><link linkend="method-glibmaincontext--iteration">iteration</link></methodname>
<methodparam><parameter>may_block</parameter></methodparam>
</methodsynopsis>
<methodsynopsis language="python">
<methodname><link linkend="method-glibmaincontext--pending">pending</link></methodname>
</methodsynopsis>
</classsynopsis>
</refsect1>
<refsect1>
<title>Ancestry</title>
<synopsis>+-- <link linkend="class-glibmaincontext">glib.MainContext</link>
</synopsis>
</refsect1>
<refsect1>
<title>Description</title>
<para>A <link
linkend="class-glibmaincontext"><classname>glib.MainContext</classname></link>
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 <literal>GTK</literal> and <literal>PyGTK</literal> though
others can be added. Each event source is assigned a priority. The default
priority, <literal>glib.PRIORITY_DEFAULT</literal>, 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 <link
linkend="class-glibmaincontext"><classname>glib.MainContext</classname></link>
can be run with the <link
linkend="method-glibmaincontext--iteration"><methodname>iteration</methodname>()</link>
method.</para>
</refsect1>
<refsect1 id="constructor-glibmaincontext">
<title>Constructor</title>
<programlisting><constructorsynopsis language="python">
<methodname>glib.MainContext</methodname>
</constructorsynopsis></programlisting>
<variablelist>
<varlistentry>
<term><emphasis>Returns</emphasis> :</term>
<listitem><simpara>a new <link
linkend="class-glibmaincontext"><classname>glib.MainContext</classname></link>
object.</simpara></listitem>
</varlistentry>
</variablelist>
<para>Creates a new <link
linkend="class-glibmaincontext"><classname>glib.MainContext</classname></link>
object.</para>
</refsect1>
<refsect1>
<title>Methods</title>
<refsect2 id="method-glibmaincontext--iteration">
<title>glib.MainContext.iteration</title>
<programlisting><methodsynopsis language="python">
<methodname>iteration</methodname>
</methodsynopsis></programlisting>
<variablelist>
<varlistentry>
<term><parameter>may_block</parameter> :</term>
<listitem><simpara>if <literal>True</literal> the call may block
waiting for an event.</simpara></listitem>
</varlistentry>
<varlistentry>
<term><emphasis>Returns</emphasis> :</term>
<listitem><simpara><literal>True</literal> if events were
dispatched.</simpara></listitem>
</varlistentry>
</variablelist>
<para>The <methodname>iteration</methodname>() method runs a single
iteration. This involves:</para>
<itemizedlist>
<listitem>
<simpara>checking to see if any associated event sources are ready
to be processed;</simpara>
</listitem>
<listitem>
<simpara>then if no events sources are ready and
<parameter>may_block</parameter> is <literal>True</literal>, waiting for a
source to become ready;</simpara>
</listitem>
<listitem>
<simpara>and finally, dispatching the highest priority events
sources that are ready</simpara>
</listitem>
</itemizedlist>
<para>Note that even when <parameter>may_block</parameter> is
<literal>True</literal>, it is still possible for
<methodname>iteration</methodname>() to return <literal>False</literal>,
since the the wait may be interrupted for other reasons than an event source
becoming ready.</para>
</refsect2>
<refsect2 id="method-glibmaincontext--pending">
<title>glib.MainContext.pending</title>
<programlisting><methodsynopsis language="python">
<methodname>pending</methodname>
</methodsynopsis></programlisting>
<variablelist>
<varlistentry>
<term><emphasis>Returns</emphasis> :</term>
<listitem><simpara><literal>True</literal> if events are
pending.</simpara></listitem>
</varlistentry>
</variablelist>
<para>The <methodname>pending</methodname>() method checks if any
associated sources have pending events.</para>
</refsect2>
</refsect1>
</refentry>
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