Tk::Calculator::RPN::HP Tk::Calculator::RPN::HP contains Hewlett-Packard RPN calculators.
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calculator Perl module rpn calculator rpn HP Hewlett-Packard calculator

Tk::Calculator::RPN::HP Description

Tk::Calculator::RPN::HP contains Hewlett-Packard RPN calculators. Tk::Calculator::RPN::HP contains Hewlett-Packard RPN calculators.SYNOPSIS use Tk::Calculator::RPN::HP; $mw->Calculator( -type => '21' | '16c' )->pack;Tk::Calculator::RPN::HP is the OO base class and Exporter module for Perl/Tk Hewlett-Packard Reverse Polish Notation (RPN) calculators. As a base class it provides methods common to all calculators; for instance, stack manipulation, function evaluation, and instance creation activities. As an exporter of data, it provides global variables and function subroutine definitions.Tk::Calculator::RPN::HP provides a single constructor, Calculator, as shown in the SYNOPSIS section.Tk::Calculator::RPN::HP provides a Populate method implicity used by all calculator subclasses. The only option that Populate requires is -type, the type of calculator. Given -type, Populate loads the appropriate module, performs common instance pre-initialization, and then calls out to the subclass' Populate method to create the actual calculator.Subclasses of Tk::Calculator::RPN::HP have this basic structure: $Tk::Calculator::RPN::HP_21::VERSION = '1.2'; package Tk::Calculator::RPN::HP_21; use Tk::widgets qw/SlideSwitch/; use Tk::Calculator::RPN::HP; use base qw/Tk::Calculator::RPN::HP/; use strict; our $HELP; sub ClassInit { my ($class, $mw) = @_; $HELP = $class->build_help_window($mw); $class->SUPER::ClassInit($mw); } # end ClassInit sub Populate { my ($self, $args) = @_; ... $self->build_help_button($frame1, $HELP)->pack(qw/-side left/); ... } # end Populate # Function key processors. sub clxclr { my ($self) = @_; return unless $self->{ONOFF}; if ($self->{G_PRESSED}) { # clr $self->clr; } else { # clx $self->clx; } } # end clxclr 1;As you can see, the module is simply a standard Perl/Tk mega-widget.You are required to invoke two methods, build_help_window and build_help_button. build_help_window creates a Toplevel that's exposed when the ? Button is pressed. build_help_button builds the ? Button proper. Because the Toplevel help window is used by all class instances, it's typically created in ClassInit. You call build_help_button when and where you want the ? packed.Although most calculator functions are provided by the base class, you may find it necessary to write your own function key processors. Requirements: · Perl

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