er</B
> :: x0 -&gt; x1 -&gt; IO Bool</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:QeventFilter')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:QeventFilter" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Qtc-Gui-QDataWidgetMapper.html#t%3AQeventFilter"
>QeventFilter</A
> (<A HREF="Qtc-ClassTypes-Gui.html#t%3AQDat