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# $Id: NumEntryPlain.pm,v 1.10 2003/10/22 21:32:59 eserte Exp $
package Tk::NumEntryPlain;
use Tk ();
use Tk::Derived;
use Tk::Entry;
use strict;
use vars qw(@ISA $VERSION);
@ISA = qw(Tk::Derived Tk::Entry);
$VERSION = sprintf("%d.%02d", q$Revision: 1.10 $ =~ /(\d+)\.(\d+)/);
Construct Tk::Widget 'NumEntryPlain';
sub ClassInit {
    my ($class,$mw) = @_;
    $class->SUPER::ClassInit($mw);
    $mw->bind($class,'<Leave>', 'Leave');
    $mw->bind($class,'<FocusOut>', 'Leave');
    $mw->bind($class,'<Return>', 'Return');
    $mw->bind($class,'<Up>', 'Up');
    $mw->bind($class,'<Down>', 'Down');
    $mw->bind($class,'<Home>', 'Home');
    $mw->bind($class,'<End>', 'End');
    $mw->bind($class,'<Prior>', 'Prior');
    $mw->bind($class,'<Next>', 'Next');
}
## Bindings callbacks
sub Leave {
    my $e = shift;
    $e->incdec(0);  # range check
}
sub Return {
    my $e = shift;
    my $v = $e->value; # range check
    $e->Callback(-command => $v);
}
sub Up {
    my $e = shift;
    $e->incdec($e->cget(-increment));
}
sub Down {
    my $e = shift;
    $e->incdec(-$e->cget(-increment));
}
sub Prior {
    my $e = shift;
    $e->incdec($e->cget(-bigincrement) || 1);
}
sub Next {
    my $e = shift;
    $e->incdec(-($e->cget(-bigincrement) || 1));
}
sub Insert {
    my($e,$c) = @_;
    my $dot = ($e->cget(-increment) =~ /\./ ? '.' : '');
    if($c =~ /^[-0-9$dot]$/) {
        $e->SUPER::Insert($c);
    }
    elsif(defined($c) && length($c)) {
        $e->_ringBell;
    }
}
sub Home {
    my $e = shift;
    my $min_val = $e->cget(-minvalue);
    return unless defined $min_val;
    $e->value($min_val);
}
sub End {
    my $e = shift;
    my $max_val = $e->cget(-maxvalue);
    return unless defined $max_val;
    $e->value($max_val);
}
## Widget constructor
sub Populate {
    my ($e, $args) = @_;
#    $e->SUPER::Populate($args);
    $e->ConfigSpecs(
        -value       => [METHOD   => undef,         undef,         "0"       ],
        -defaultvalue
                     => [PASSIVE  => undef,         undef,         undef     ],
        -maxvalue    => [PASSIVE  => undef,         undef,         undef     ],
        -minvalue    => [PASSIVE  => undef,         undef,         undef     ],
        -bell        => [PASSIVE  => "bell",        "Bell",        1         ],
        -command     => [CALLBACK => undef,         undef,         undef     ],
        -browsecmd   => [CALLBACK => undef,         undef,         undef     ],
        -increment    => [PASSIVE => undef,         undef,         1         ],
        -bigincrement => [PASSIVE => undef,         undef,         undef     ],
        ($Tk::platform eq 'MSWin32' ?
          (-background => ['PASSIVE', qw/background Background/, undef]) :
          ()),
        DEFAULT      => [$e],
    );
}
## Options implementation
sub value {
    my $e = shift;
    my $old;
    if(@_) {
        my $new = 0 + shift;
        my $pos = $e->index('insert');
        $old = $e->get;
        $e->delete(0,'end');
        $e->insert(0,$new);
        $e->icursor($pos);
    }
    else {
        $e->incdec(0); # range check
        $old = $e->get;
    }
    # Do a range check after all configuration has finished,
    # as we may not yet know the range
    $e->afterIdle([ $e => 'incdec', 0]);
    length($old) ? $old + 0 : $e->{Configure}{'-defaultvalue'};
}
sub _ringBell {
    my $e = shift;
    my $v;
    return
        unless defined($v = $e->{Configure}{'-bell'});
    $e->bell
        if(($v =~ /^\d+$/ && $v) || $v =~ /^true$/i);
}
sub incdec {
    my($e,$inc) = @_;
    my $val = $e->get;
    if($inc == 0 && $val =~ /^-?$/) {
        $val = "";
    }
    else {
        my $min = $e->{Configure}{'-minvalue'};
        my $max = $e->{Configure}{'-maxvalue'};
        $val = 0 if !$val;
        $val += $inc;
        my $limit = undef;
        $limit = $val = $min
            if(defined($min) && $val < $min);
        $limit = $val = $max
            if(defined($max) && $val > $max);
        if(defined $limit) {
            $e->_ringBell
                if $inc;
        }
    }
    my $pos = $e->index('insert');
    $e->delete(0,'end');
    $e->insert(0,$val);
    $e->icursor($pos);
    $e->Callback(-browsecmd) if $inc;
}
1;
__END__
HideShow 110 lines of Pod
=head1 NAME
Tk::NumEntryPlain - A numeric entry widget
=head1 SYNOPSIS
S<    >B<use Tk::NumEntryPlain>;
=head1 DESCRIPTION
B<Tk::NumEntryPlain> defines a widget for entering integer numbers.
B<Tk::NumEntryPlain> supports all the options and methods that a normal
L<Entry|Tk::Entry> widget provides, plus the following options
=head1 STANDARD OPTIONS
B<-repeatdelay>
B<-repeatinterval>
=head1 WIDGET-SPECIFIC OPTIONS
=over 4
=item -minvalue
Defines the minimum legal value that the widget can hold. If this
value is C<undef> then there is no minimum value (default = undef).
=item -maxvalue
Defines the maximum legal value that the widget can hold. If this
value is C<undef> then there is no maximum value (default = undef).
=item -bell
Specifies a boolean value. If true then a bell will ring if the user
attempts to enter an illegal character into the entry widget, and
when the user reaches the upper or lower limits when using the
up/down buttons for keys (default = true).
=item -textvariable
Reference to a scalar variable that contains the value currently
in the B<NumEntry>.  Use the variable only for reading (see
L<"CAVEATS"> below).
=item -value
Specifies the value to be inserted into the entry widget. Similar
to the standard B<-text> option, but will perform a range
check on the value.
=item -command
A callback which is called if <Return> is pressed.
=item -browsecmd
A callback which is called every time an increment or decrement
happens in the entry widget.
=back
=head1 WIDGET METHODS
=over 4
=item I<$numentry>->B<incdec>(I<increment>)
Increment the value of the entry widget by the specified increment. If
increment is 0, then perform a range check.
=back
=head1 CAVEATS
=over 4
=item -textvariable
B<-textvariable> should only be used to read out the current
value in the B<NumEntry>.
Values set via B<-textvariable> are not valided. Therefore
it's possible to insert, e.g., 'abc', into the B<NumEntry>.
=back
=head1 SEE ALSO
L<Tk::NumEntry|Tk::NumEntry>
L<Tk::Entry|Tk::Entry>
=head1 HISTORY
The code was extracted from B<Tk::NumEntry> and slightly modified
by Achim Bohnet E<lt>ach@mpe.mpg.deE<gt>.  B<Tk::NumEntry>'s author
is Graham Barr E<lt>gbarr@pobox.comE<gt>.
Current maintainer is Slaven Rezic E<lt>slaven@rezic.deE<gt>.
=head1 COPYRIGHT
Copyright (c) 1997-1998 Graham Barr. All rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=cut