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<HTML>
<HEAD>
<TITLE>Tk::Derived - Base class for widgets derived from others</TITLE>
<LINK REL="stylesheet" HREF="../../../Active.css" TYPE="text/css">
<LINK REV="made" HREF="mailto:">
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<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Tk::Derived - Base class for widgets derived from others</P></STRONG>
</TD></TR>
</TABLE>
<A NAME="__index__"></A>
<!-- INDEX BEGIN -->
<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<LI><A HREF="#see also">SEE ALSO</A></LI>
</UL>
<!-- INDEX END -->
<HR>
<P>
<H1><A NAME="name">NAME</A></H1>
<P>Tk::Derived - Base class for widgets derived from others</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Linux</LI>
<LI>Solaris</LI>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
package Tk::Whatever;
require Tk::Something;
require Tk::Derived;</PRE>
<PRE>
@ISA = qw(Tk::Derived Tk::Something);</PRE>
<PRE>
sub Populate
{
my ($cw,$args) = @_;
...
$cw->SUPER::Populate($args);
$cw->ConfigSpecs(...);
...
}</PRE>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>Tk::Derived is used with perl5's multiple inheritance to override some
methods normally inherited from Tk::Widget.</P>
<P>Tk::Derived should precede any Tk widgets in the class's @ISA.</P>
<P>Tk::Derived's main purpose is to apply wrappers to <CODE>configure</CODE> and <CODE>cget</CODE>
methods of widgets to allow the derived widget to add to or modify behaviour
of the configure options supported by the base widget.</P>
<P>The derived class should normally override the <CODE>Populate</CODE> method provided
by Tk::Derived and call <A HREF="#item_ConfigSpecs"><CODE>ConfigSpecs</CODE></A> to declare configure options.</P>
<P>The public methods provided by Tk::Derived are as follows:</P>
<DL>
<DT><STRONG><A NAME="item_ConfigSpecs">->ConfigSpecs(-<EM>key</EM> => [<EM>kind</EM>, <EM>name</EM>, <EM>Class</EM>, <EM>default</EM>], ...)</A></STRONG><BR>
<DD>
</DL>
<P>
<HR>
<H1><A NAME="see also">SEE ALSO</A></H1>
<P><A HREF="../../../Tk/ConfigSpecs.html">Tk::ConfigSpecs</A>
<A HREF="../../../site/lib/Tk/mega.html">Tk::mega</A></P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Tk::Derived - Base class for widgets derived from others</P></STRONG>
</TD></TR>
</TABLE>
</BODY>
</HTML>