<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>Why doesn't my widget (e.g. progressbar)
update? [GTK 2.x]</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REL="HOME"
TITLE="GTK+ FAQ"
HREF="book1.html"><LINK
REL="UP"
TITLE="Development with GTK+: general questions"
HREF="c466.html"><LINK
REL="PREVIOUS"
TITLE="How do I make my window modal? / How do I make a single
window active?"
HREF="x587.html"><LINK
REL="NEXT"
TITLE="How do I attach data to some GTK+ object/widget?
[GTK 2.x]"
HREF="x601.html"></HEAD
><BODY
CLASS="SECT1"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>GTK+ FAQ</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="x587.html"
ACCESSKEY="P"
><<< Previous</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Development with GTK+: general questions</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="x601.html"
ACCESSKEY="N"
>Next >>></A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN592"
>Why doesn't my widget (e.g. progressbar)
update? <I
CLASS="EMPHASIS"
>[GTK 2.x]</I
></A
></H1
><P
>You are probably doing all the changes within a function without
returning control to <TT
CLASS="LITERAL"
>gtk_main()</TT
>. This may
be the case if you do some lengthy calculation in your
code. Most drawing updates are only placed on a queue, which
is processed within <TT
CLASS="LITERAL"
>gtk_main()</TT
>. You can force the
drawing queue to be processed using something like:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>while (g_main_context_iteration(NULL, FALSE));</PRE
></TD
></TR
></TABLE
><P
>inside you're function that changes the widget.</P
><P
>What the above snippet does is run all pending events
and high priority idle functions, then return immediately
(the drawing is done in a high priority idle function).</P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="x587.html"
ACCESSKEY="P"
><<< Previous</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="book1.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="x601.html"
ACCESSKEY="N"
>Next >>></A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>How do I make my window modal? / How do I make a single
window active?</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="c466.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>How do I attach data to some GTK+ object/widget?
<I
CLASS="EMPHASIS"
>[GTK 2.x]</I
></TD
></TR
></TABLE
></DIV
></BODY
></HTML
>