Tk::Bounded - Base class for widgets derived and bound binded from others
package Tk::MyNewWidget; use Tk::widgets qw/BaseWidget, list of Tk widgets/; use base qw/Tk::Bounded Tk::BaseWidget/; Construct Tk::Widget 'MyNewWidget'; sub ClassInit { my( $class, $mw ) = @_; #... e.g., class bindings here ... $class->SUPER::ClassInit( $mw ); $mw -> bound( $class, '<Left>', [ qw/keybounds 0/ ], [ 'testbEv', bEv('m'), bEv('t'), bEv('s'), bEv('c') ] ); } 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 } sub keybounds { my( $self, $limit ) = @_; return $self -> index( 'insert' ) == $self -> index( $limit ) ? nP : Np; } sub testbEv { my( $self, $m, $t, $s, $c ) = @_; print "$m, $t, $s, $c\n"; my $bev = $self -> bXEvent; $m = $bev -> m; print "$m\n"; $bev = $Tk::bevent; $m = $bev -> m; print "$m\n"; my $w = $Tk::bwidget; print "$w\n"; }
Tk::Bounded is used with Perl's multiple inheritance to override some methods normally inherited from Tk::Derived and Tk::Widget. It also specifies level 1 bound tags for caller class.
Tk::Bounded should precede any Tk widgets in the class's base class definition.
Tk::Bounded'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.
configure
cget
The bounded class should normally override the Populate method provided by Tk::Bounded and call ConfigSpecs to declare configure options.
Populate
ConfigSpecs
The public methods provided by Tk::Bounded are as follows:
Tk::Derived Tk::ConfigSpecs Tk::mega Tk::composite Tk::bound Tk::boundtags
To install Tk::Bounded, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Tk::Bounded
CPAN shell
perl -MCPAN -e shell install Tk::Bounded
For more information on module installation, please visit the detailed CPAN module installation guide.