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Why is subclassing not allowed for many of the SWT Controls?

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Old 12-05-2011
Why is subclassing not allowed for many of the SWT Controls?
hi guys,

Why is subclassing not allowed for many of the SWT Controls?

But Eclipse itself creates our Shell classes in this way (inheriting from Shell) and then overriding checkSubclass() with empty body. So is it good(safe) that we do this way? I have two shells (Shell_1, Shell_2). Shell_1 is parent of Shell_2. I only want to extend from Shell class for Shell_2 so I can simply add controls on it inside the constructor of Shell_2. Is this wrong way to do?
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LEARN ABOUT CENTOS

cpanplus::shell::default::plugins::source

CPANPLUS::Shell::Default::Plugins::Source(3)		User Contributed Perl Documentation	      CPANPLUS::Shell::Default::Plugins::Source(3)

NAME

       CPANPLUS::Shell::Default::Plugins::Source - read in CPANPLUS commands

SYNOPSIS

	   CPAN Terminal> /source /tmp/list_of_commands /tmp/more_commands

DESCRIPTION

       This is a "CPANPLUS::Shell::Default" plugin that works just like your unix shells source(1) command; it reads in a file that has commands
       in it to execute, and then executes them.

       A sample file might look like this:

	   # first, update all the source files
	   x --update_source

	   # find all of my modules that are on the CPAN
	   # test them, and store the error log
	   a ^KANE$'
	   t *
	   p /home/kane/cpan-autotest/log

	   # and inform us we're good to go
	   ! print "Autotest complete, log stored; please enter your commands!"

       Note how empty lines, and lines starting with a '#' are being skipped in the execution.

BUG REPORTS

       Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

       The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

       This library is free software; you may redistribute and/or modify it under the same terms as Perl itself.

SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell, cpanp

perl v5.16.3							    2013-05-20			      CPANPLUS::Shell::Default::Plugins::Source(3)