derived(3)
NAME
Tk::Derived - Base class for widgets derived from others
SYNOPSIS
package Tk::Whatever;
require Tk::Something;
require Tk::Derived;
@ISA = qw(Tk::Derived Tk::Something);
sub Populate
{
my ($cw,$args) = @_;
...
$cw->SUPER::Populate($args);
$cw->ConfigSpecs(...);
...
}
DESCRIPTION
Tk::Derived is used with perl5's multiple inheritance to
override some methods normally inherited from Tk::Widget.
Tk::Derived should precede any Tk widgets in the class's
@ISA.
Tk::Derived's main purpose is to apply wrappers to "con
figure" 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