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CentOS 7.0 - man page for tk::derived (centos section 3)

Derived(3)		       User Contributed Perl Documentation		       Derived(3)

NAME
       Tk::Derived - Base class for widgets derived from others

SYNOPSIS
	   package Tk::MyNewWidget;

	   use Tk::widgets qw/ BaseWidget, list of Tk widgets /;
	   use base qw/ Tk::Derived Tk::BaseWidget /;

	   Construct Tk::Widget 'MyNewWidget';

	   sub ClassInit {
	       my( $class, $mw ) = @_;
	       #... e.g., class bindings here ...
	       $class->SUPER::ClassInit( $mw );
	   }

	   sub Populate {
	       my( $self, $args ) = @_;

	       my $flag = delete $args->{-flag};
	       if( defined $flag ) {
		   # handle -flag => xxx which can only be done at create
		   # time the delete above ensures that new() does not try
		   # and do  $self->configure( -flag => xxx );
	       }

	       $self->SUPER::Populate( $args );

	       $self = $self->Component( ... );

	       $self->Delegates( ... );

	       $self->ConfigSpecs(
		   '-cursor'	=> [ SELF, 'cursor', 'Cursor',	 undef ],
		   '-something' => [ METHOD, dbName,  dbClass, default ],
		   '-text'	=> [ $label, dbName,  dbClass, default ],
		   '-heading'	=> [ {-text => $head},
				       heading, Heading,  'My Heading' ],
	      );
	  }

	  sub something {
	      my( $self, $value) = @_;
	      if ( @_ > 1 ) {
		 # set it
	      }
	      return # current value
	  }

DESCRIPTION
       Tk::Derived is used with Perl's multiple inheritance to override some methods normally
       inherited from Tk::Widget.

       Tk::Derived should precede any Tk widgets in the class's base class definition.

       Tk::Derived's main purpose is to apply wrappers to "configure" and "cget" methods of
       widgets to allow the derived widget to add to or modify behaviour of the configure options
       supported by the base widget.

       The derived class should normally override the "Populate" method provided by Tk::Derived
       and call "ConfigSpecs" to declare configure options.

       The public methods provided by Tk::Derived are as follows:

       ->ConfigSpecs(-key => [kind, name, Class, default], ...)

SEE ALSO
       Tk::ConfigSpecs Tk::mega Tk::composite

perl v5.16.3				    2014-06-10				       Derived(3)


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