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-
-## Author: Achim Bohnet <ach@mpe.mpg.de>
-##
-## Copyright (c) 1997-1998 Achim Bohnet. All rights reserved.
-## You can redistribute this document and/or modify it under the
-## same terms as Perl itself.
-##
-## Update for Tk804.025, Steve Lidie, 2004/01/11.
-
-=head1 NAME
-
-Tk::mega - Perl/Tk support for writing widgets in pure Perl
-
-=for category Derived Widgets
-
-=head1 SYNOPSIS
-
-Define the widget's new class name:
-
-S<    >B<package Tk::>I<MyNewWidget>;
-
-For composite widget classes:
-
-S<    >B<use base qw/ Tk::container />; # where B<container> is I<Frame> or I<Toplevel>
-
-For derived widget classes:
-
-S<    >B<use base qw/ Tk::Derived Tk::DerivedWidget /;>
-
-Install the new widget in Tk's namespace and establish class and instance
-constructors.
-
-S<    >B<Construct Tk::>I<Widget> I<'MyNewWidget'>;
-
-S<    >B<sub ClassInit> { I<my ($self, $args) = @_; ...> }
-
-S<    >B<sub Populate> { I<my ($self, $args) = @_; ...> }
-
-=head1 DESCRIPTION
-
-The goal of the mega-widget support of Perl/Tk is to make it
-easy to write mega-widgets that obey the same protocol and
-interface that the Tk core widgets support.
-I<For mega-widget sample code please run the B<widget> demonstration program and go to the section B<Sample Perl Mega-Widgets>.>
-
-There are two kinds of mega-widgets:
-
-=over 4
-
-=item * Composite Widgets
-
-A composite widget is composed with one or more existing widgets.
-The composite widget looks to the user like a simple single widget.
-A well known example is the file selection box.
-
-=item * Derived Widgets
-
-A derived widget adds/modifies/removes properties and methods
-from a single widget (this widget may itself be a mega-widget).
-
-=back
-
-=head1 MEGA-WIDGET SUPPORT
-
-=head2 Advertise
-
-Give a subwidget a symbolic name.
-
-Usage:
-
-S<    >I<$self>-E<gt>B<Advertise>(B<name>=E<gt>I<$widget>);
-
-Gives a subwidget I<$widget> of the mega-widget I<$self> the
-name B<name>.  One can retrieve the reference of an advertised subwidget
-with the L<Subwidget|"Subwidget"> method.
-
-B<Comment:> Mega-Widget Writers: Please make sure to document the
-advertised widgets that are intended for I<public> use.
-If there are none, document this fact, e.g.:
-
-	=head1 ADVERTISED WIDGETS
-
-	None.
-
-=head2 Callback
-
-Invoke a callback specified with an option.
-
-Usage:
-
-S<    >I<$self>-E<gt>B<Callback>(I<-option> ?,I<args> ...?);
-
-B<Callback> executes the L<callback|Tk::callbacks> defined with
-I<$self>-E<gt>B<ConfigSpecs>(I<-option>, [B<CALLBACK>, ...]);
-If I<args> are given they are passed to the callback. If
-I<-option> is not defined it does nothing.
-
-=head2 ClassInit
-
-Initialization of the mega-widget class.
-
-Usage:
-
-S<    >B<sub ClassInit> { I<my ($class, $mw) = @_;> ...  }
-
-B<ClassInit> is called once for I<each> L<MainWindow|Tk::MainWindow>
-just before the first widget instance of a class is created in
-the widget tree of B<MainWindow>.
-
-B<ClassInit> is often used to define bindings and/or other
-resources shared by all instances, e.g., images.
-
-Examples:
-
- $mw->bind($class,"<Tab>", sub { my $w = shift; $w->Insert("\t"); $w->focus; $w->break});
- $mw->bind($class,"<Return>", ['Insert',"\n"]);
- $mw->bind($class,"<Delete>",'Delete');
-
-Notice that I<$class> is the class name (e.g. B<Tk::MyText>) and I<$mw> is the mainwindow.
-
-Don't forget to call I<$class>-E<gt>B<SUPER::ClassInit($mw)> in
-B<ClassInit>.
-
-=head2 Component
-
-Convenience function to create subwidgets.
-
-Usage:
-
-    $cw->Component('Whatever', 'AdvertisedName',
-        -delegate => ['method1', 'method2', ...],
-        ... more widget options ...,
-    );
-
-B<Component> does several things for you with one call:
-
-=over 4
-
-o Creates the widget
-
-o Advertises it with a given name (overridden by 'Name' option)
-
-o Delegates a set of methods to this widget (optional)
-
-=back
-
-Example:
-
-    $cw->Component('Button', 'quitButton', -command => sub{$mw->'destroy'});
-
-=head2 ConfigSpecs
-
-Defines options and their treatment
-
-Usage:
-
-    $cw->ConfigSpecs(
-        -option => [ where, dbname, dbclass, default],
-        ...,
-        DEFAULT => [where],
-    );
-
-Defines the options of a mega-widget and what actions
-are triggered by configure/cget of an option
-(see L<Tk::ConfigSpecs> and L<Tk::Derived> for details).
-
-=head2 Construct
-
-Make the new mega-widget known to B<Tk>.
-
-Usage:
-
-S<    >B<Construct> I<baseclass> B<'Name'>;
-
-B<Construct> declares the new widget class so that your mega-widget
-works like normal Perl/Tk widgets.
-
-Examples:
-
-S<    >B<Construct Tk::Widget> I<'Whatever'>;
-S<    >B<Construct Tk::Menu>   I<'MyItem'>;
-
-First example lets one use I<$widget>-E<gt>B<Whatever> to create
-new B<Whatever> widget.
-
-The second example restricts the usage of the B<MyItem> constructor
-method to widgets that are derived from B<Menu>:
-I<$isamenu>-E<gt>I<MyItem>.
-
-=head2 CreateArgs
-
-Process options before any widget is created:
-
-S<    >B<sub CreateArgs> { I<my ($package, $parent, $args) = @_; ...; return @newargs;> }
-
-I<$package> is the package of the mega-widget (e.g., B<Tk::MyText>,
-I<$parent> the parent of the widget to be created and $args the hash
-reference to the options specified in the widget constructor call.
-
-Don't forget to call I<$package>-E<gt>B<SUPER::CreateArgs>(I<$parent>, I<$args>) in
-B<CreateArgs>.
-
-=head2 Delegates
-
-Redirect a method of the mega-widget to a subwidget of
-the composite widget
-
-Usage:
-
-    $cw->Delegates(
-        'method1' => $subwidget1,
-        'method2' => 'advertived_name',
-        ...,
-        'Construct' => $subwidget2,
-        'DEFAULT'   => $subwidget3,
-    );
-
-The B<'Construct'> delegation has a special meaning.  After
-'Construct' is delegated all Widget constructors are redirected.
-E.g. after
-
-S<    >I<$self>-E<gt>B<Delegates>(B<'Construct'>=E<gt>I<$subframe>);
-
-a I<$self>-E<gt>B<Button> does really a I<$subframe>-E<gt>B<Button>
-so the created button is a child of I<$subframe> and not I<$self>.
-
-B<Comment:> Delegates works only with methods that I<$cw> does
-not have itself.
-
-=head2 InitObject
-
-I<Note: this method should not, in general, be used, as it has been
-superceeded by B<Populate> and specifying B<Tk::Derived> as one of the base
-classes.>
-
-Defines construction and interface of derived widgets.
-
-Usage:
-
-    sub InitObject {
-	my ($derived, $args) = @_;
-	...
-    }
-
-where I<$derived> is the widget reference of the already created
-baseclass widget and I<$args> is the reference to a hash of
-I<-option-value> pairs.
-
-B<InitObject> is almost identical to L<Populate|"Populate"> method.
-B<Populate> does some more 'magic' things useful for mega-widgets
-with several widgets.
-
-Don't forget to call I<$derived>-E<gt>B<SUPER::InitObject>(I<$args>) in
-B<InitObject>.
-
-=head2 OnDestroy
-
-Define a callback invoked when the mega-widget is destroyed.
-
-Usage:
-
-S<    >I<$widget>-E<gt>B<OnDestroy>(I<callback>);
-
-B<OnDestroy> installs a L<callback|Tk::callbacks> that's called
-when a widget is going to to be destroyed.  Useful
-for special cleanup actions.  It differs from a normal B<destroy>
-in that all the widget's data structures are still intact.
-
-B<Comment:> This method could be used with any widgets not just
-for mega-widgets.  It's listed here because of it's usefulness.
-
-=head2 Populate
-
-Defines construction and interface of the composite
-widget.
-
-Usage:
-
-    sub Populate {
-	my ($self, $args) = @_;
-	...
-    }
-
-where I<$self> is the widget reference of the already created baseclass
-widget and I<$args> is the
-reference to a hash of I<-option-value> pairs.
-
-Most the other support function are normally used inside the B<Populate>
-subroutine.
-
-Don't forget to call I<$cw>-E<gt>B<SUPER::Populate>(I<$args>) in
-B<Populate>.
-
-=head2 privateData
-
-Set/get a private hash of a widget to storage
-composite internal data
-
-Usage:
-
-S<    >I<$hashref> = I<$self>-E<gt>B<privateData>();
-
-S<    >I<$another> = I<$self>-E<gt>B<privateData>(I<unique_key>|I<package>);
-
-=head2 Subwidget
-
-Get the widget reference of an advertised subwidget.
-
-S<    >I<@subwidget> = I<$cw>-E<gt>B<Subwidget>();
-
-S<    >I<$subwidget> = I<$cw>-E<gt>B<Subwidget>(I<name>);
-
-S<    >I<@subwidget> = I<$cw>-E<gt>B<Subwidget>(I<name> ?,...?);
-
-Returns the widget reference(s) of the subwidget known under the given
-name(s). Without arguments, return all known subwidgets of I<$cw>. See
-L<Advertise|"Advertise"> method how to define I<name> for a subwidget.
-
-B<Comment:> Mega-Widget Users: Use B<Subwidget> to get I<only>
-documented subwidgets.
-
-=head1 PITFALLS
-
-=over 4
-
-=item * Resource DB class name
-
-Some of the standard options use a resource date base class
-that is not equal to the resource database name.  E.g.,
-
-  Switch:            Name:             Class:
-
-  -padx              padX              Pad
-  -activerelief      activeRelief      Relief
-  -activebackground  activeBackground  Foreground
-  -status            undef             undef
-
-One should do the same when one defines one of these
-options via B<ConfigSpecs>.
-
-=item * Method delegation
-
-Redirecting methods to a subwidget with B<Delegate>
-can only work if the base widget itself does have a
-method with this name.  Therefore one can't ``I<delegate>''
-any of the methods listed in L<Tk::Widget|Tk::Widget>.
-A common problematic method is B<bind>.  In this case
-one as to explicitely redirect the method.
-
-  sub bind {
-      my $self = shift;
-      my $to = $self->privateData->{'my_bind_target'};
-      $to->bind(@_);
-  }
-
-=item * privateData
-
-Graham Barr wrote: ... It is probably
-more private than most people think. Not all calls to privateData will
-return that same HASH reference. The HASH reference that is returned
-depends on the package it was called from, a different HASH is returned
-for each package. This allows a widget to hold private data, but then
-if it is sub-classed the sub-class will get a different HASH and so not
-cause duplicate name clashes.
-
-But privateData does take an optional argument if you want to
-force which HASH is returned.
-
-=item * Scrolled and Composite
-
-B<Scrolled>(I<Kind>,...) constructor can not be used with B<Composite>.
-One has to use $cw->B<Composite>(B<Scrl>I<Kind> =E<gt> B<'name'>, ...);
-
-=back
-
-=head1 MISSING
-
-Of course Perl/Tk does not define support function for
-all necessities.  Here's a short list of things you have to
-handle yourself:
-
-=over 4
-
-=item *
-
-No support to define construction-time only options.
-
-=item *
-
-No support to remove an option that is known to the
-base widget.
-
-=item *
-
-It's hard to define B<undef> as fallback for an widget
-option that is not already B<undef>.
-
-=item *
-
-Frame in Perl/Tk carries magic and overhead not needed
-for composite widget class definition.
-
-=item *
-
-No support methods for bindings that are shared between all
-widgets of a composite widget (makes sense at all?)
-
-=back
-
-=head1 KEYWORDS
-
-mega, composite, derived, widget
-
-=head1 SEE ALSO
-
-L<Tk::composite|Tk::composite>
-L<Tk::ConfigSpecs|Tk::ConfigSpecs>
-L<Tk::option|Tk::option>
-L<Tk::callbacks|Tk::callbacks>
-L<Tk::bind|Tk::bind>
-
-=cut
-