package Tk::NumEntryPlain;
use Tk ();
use Tk::Derived;
use Tk::Entry;
use strict;
use vars qw(@ISA $VERSION);
@ISA = qw(Tk::Derived Tk::Entry);
$VERSION = "0.08";
Construct Tk::Widget 'NumEntryPlain';
sub ClassInit {
my ($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');
}
## Bindings callbacks
sub Leave {
my $e = shift;
$e->incdec(0); # range check
}
sub Return {
my $e = shift;
my $cmd = $e->{Configure}{'-command'};
my $v = $e->value; # range check
$cmd->Call($v)
if $cmd;
}
sub Up {
my $e = shift;
$e->incdec(1,'initial');
}
sub Down {
my $e = shift;
$e->incdec(-1,'initial');
}
sub Insert {
my($e,$c) = @_;
if($c =~ /^[-0-9]$/) {
$e->SUPER::Insert($c);
}
elsif(defined($c) && length($c)) {
$e->_ringBell;
}
}
## Widget constructor
sub Populate {
my ($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 ],
);
}
## 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,$i) = @_;
my $val = $e->get;
if($inc == 0 && $val =~ /^-?$/) {
$val = "";
}
else {
my $min = $e->{Configure}{'-minvalue'};
my $max = $e->{Configure}{'-maxvalue'};
$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);
}
1;
__END__
=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.
=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<gt>ach@mpe.mpg.deE<gt>. B<Tk::NumEntry>'s author
is Graham Barr E<gt>gbarr@pobox.comE<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