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-#  Copyright (c) 1990-1994 The Regents of the University of California.
-#  Copyright (c) 1994-1996 Sun Microsystems, Inc.
-#  See the file "license.terms" for information on usage and redistribution
-#  of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-#
-#
-
-=head1 NAME
-
-Tk::Error - Method invoked to process background errors
-
-=for category Binding Events and Callbacks
-
-=head1 SYNOPSIS
-
-Customization:
-
-    require Tk::ErrorDialog;
-
-or
-
-    sub Tk::Error
-    {
-      my ($widget,$error,@locations) = @_;
-      ...
-
-    }
-
-=head1 DESCRIPTION
-
-The B<Tk::Error> method is invoked by perl/Tk when a background
-error occurs. Two possible implementations are provided in the
-distribution and individual applications or users can (re)define a B<Tk::Error>
-method (e.g. as a perl sub) if they wish to handle background
-errors in some other manner.
-
-A background error is one that occurs in a command that didn't
-originate with the application.  For example, if an error occurs
-while executing a L<callback|Tk::callbacks> specified with a
-L<bind|Tk::bind> or a L<after|Tk::after>
-command, then it is a background error.  For a non-background error,
-the error can simply be returned up through nested subroutines
-until it reaches the top-level code in the application;
-then the application can report the error in whatever way it
-wishes.  When a background error occurs, the unwinding ends in
-the Tk library and there is no obvious way for Tk to report
-the error.
-
-When Tk detects a background error, it saves information about the
-error and invokes the B<Tk::Error> method later when Tk is idle.
-
-B<Tk::Error> is invoked by perl/Tk as if by the perl code:
-
-S<    >I<$mainwindow>-E<gt>B<Tk::Error>(I<"error message">, I<location ...>);
-
-I<$mainwindow> is the B<MainWindow> associated with widget which
-detected the error, I<"error message"> is a string describing the error
-that has been detected, I<location> is a list of one or more "locations"
-which describe the call sequence at the point the error was detected.
-
-The locations are a typically a mixture of perl location reports giving
-script name and line number, and simple strings describing locations in
-core Tk or perl/Tk C code.
-
-Tk will ignore any result returned by the B<Tk::Error> method.
-If another error occurs within the B<Tk::Error> method
-(for example if it calls B<die>) then Tk reports this error
-itself by writing a message to stderr (this is to avoid infinite loops
-due to any bugs in B<Tk::Error>).
-
-If several background errors accumulate before B<Tk::Error>
-is invoked to process them, B<Tk::Error> will be invoked once
-for each error, in the order they occurred.
-However, if B<Tk::Error> calls B<Tk-E<gt>break>, then
-any remaining errors are skipped without calling B<Tk::Error>.
-
-The B<Tk> module includes a default B<Tk::Error> subroutine
-that simply reports the error on stderr.
-
-=head1 Tk::ErrorDialog
-
-An alternate definition is provided via:
-
-S<    >C<require Tk::ErrorDialog;>
-
-that posts a dialog box containing the error message and offers
-the user a chance to see a stack trace showing where the
-error occurred.
-
-This is an OO implementation of the Tcl/Tk command B<bgerror>, with a
-twist: since there is only one B<ErrorDialog> widget, you aren't required
-to invoke the constructor to create it; it will be created
-automatically when the first background error occurs.  However, in
-order to configure the I<-cleanupcode> and I<-appendtraceback>
-B<ErrorDialog> options you must call the constructor and create it
-manually.
-
-The B<ErrorDialog> object essentially consists of two subwidgets: a
-B<Dialog> widget to display the background error and a B<Text> widget
-for the traceback information.  If required, you can invoke various
-widget methods to customize these subwidgets - their advertised names
-are described below.
-
-S<    >I<$mw>-E<gt>B<ErrorDialog>(-cleanupcode => I<code>, -appendtraceback => I<bool>);
-
-$mw is a window reference.
-
-I<code> is a CODE reference if special post-background error
-processing is required (default is undefined). The callback subroutine
-is called with @_ having the same arguments that B<Tk::Error> was
-invoked with.
-
-I<bool> is a boolean indicating whether or not to append successive
-tracebacks (default is 1, do append).
-
-=head2 Advertised ErrorDialog widgets
-
-I<error_dialog> is the Dialog widget reference.
-
-I<text> is the Text widget reference containing the traceback information.
-
-=head1 BUGS
-
-If B<after> or B<fileevent> are not invoked as methods of a widget
-then perl/Tk is unable to provide a I<$mainwindow> argument.
-To support such code from earlier versions of perl/Tk
-perl/Tk therefore calls B<Tk::Error> with string 'Tk' instead:
-B<Tk-E<gt>Tk::Error\(...\)>.
-In this case the B<Tk::Error> in B<Tk::ErrorDialog> and similar
-implementations cannot "popup" a window as they don't know which display
-to use.  A mechanism to supply I<the> B<MainWindow> in applications
-which only have one (a very common case) should be provided.
-
-=head1 SEE ALSO
-
-L<Tk::bind|Tk::bind>
-L<Tk::after|Tk::after>
-L<Tk::fileevent|Tk::fileevent>
-
-=head1 KEYWORDS
-
-background error, reporting
-
-=cut
-