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

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Top Forums Programming 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

bltk.conf

BLTK.CONF(5)						Battery life tool kit configuration					      BLTK.CONF(5)

NAME

       bltk.conf - config file for bltk

DESCRIPTION

       bltk.conf may be used to control particular features of bltk. By default, bltk looks for the file in /etc direcotry.

FORMAT

       The  format  of	bltk.conf  is  very  simple. Each line is either a comment or a directive. Comment lines start with a # and are ignored. A
       directive line has the format:

       option=value

       It is important to note that it is an error to put any space between the option, = and value.

       Each setting has a compiled in default which may be modified in the configuration file.

.BOOLEAN OPTIONS
       Below is a list of boolean options. The value for a boolean option may be set to YES or NO.

       CHK_INSTALLED
	      If set to YES, existance of .installed files is checked for.

       WL_DEVELOPER_ENABLED
	      Controls whether developer workload is enabled.

       WL_DEVELOPER_EXTERN
	      Controls whether external sources are used to build workload application.

       WL_GAME_ENABLED
	      Controls whether game workload is enabled.

       WL_GAME_EXTERN
	      Controls whether external sources are used to build workload application.

       WL_OFFICE_ENABLED
	      Controls whether office workload is enabled.

       WL_OFFICE_EXTERN
	      Controls whether external sources are used to build workload application.

       WL_PLAYER_ENABLED
	      Controls whether player workload is enabled

       WL_PLAYER_EXTERN
	      Controls whether external sources are used to build workload application.

       WL_READER_ENABLED
	      Controls whether reader workload is enabled.

       WL_READER_EXTERN
	      Controls whether external sources are used to build workload application.

.STRING OPTIONS
       BLTK_HOME This option specifies the location of BLTK's home directory. This directory is used as starting directory for saving results  and
       temporary files.

       SOFFICE_PROG
	      This option specifies an application to be started when office workload is used.

       WL_OFFICE_WORKING_DIR
	      The option specifies working directory for office workload.

       BLTK_PLAYER_PROG
	      The option replaces default aplication to be used for playing audio/video

       BLTK_PLAYER_FILE
	      The option replaces default source to be played.

       BLTK_READER_PROG
	      The option replaces default aplication to be used for reading a document.

       BLTK_READER_FILE
	      The option replaces default document to be read.

SEE ALSO

       bltk(1)

AUTHOR

       jskala@redhat.com

BLTK.CONF							   15 July 2009 						      BLTK.CONF(5)