NetNews Usenet Archive 1992 #26/NN_1992_26.iso/spool/comp/lang/tcl/1748

Text File | 1992-11-07 | 1.7 KB | 39 lines

Newsgroups: comp.lang.tcl
Path: sparky!uunet!europa.asd.contel.com!emory!sol.ctr.columbia.edu!zaphod.mps.ohio-state.edu!menudo.uh.edu!sugar!karl
From: [e-mail] (Karl Lehenbauer)
Subject: Re: Sequential Execution
Organization: NeoSoft Communications Services -- [phone]
Date: Fri, 6 Nov 1992 06:22:04 GMT
Message-ID: <[e-mail]>
Keywords: TCL, TK, Sequential, Window
References: <[e-mail]>
Lines: 27

In article <[e-mail]> [e-mail] (Tuan Doan) writes:
>   Is there a way to restrict the TCL/TK program to execute sequentially.  In
>another word, I do not want TCL/TK to execute the next 'widget' statement until
>the previous one is finished.  Something like a 'wait' statement.  Example,
>1.  <create dialog window that required user to select choice>
>2.  <create menu with choice selected by user>
>(2) should be executed only if (1) is completed.

Well, most of the time you don't want to force a sequence on users and
grasping this and programming for it is central to the windowing paradigm.

There are cases, though, like for dialogs and stuff like that, where if
you don't have a way to do modal dialogs, you end up with a lot more
callbacks and a lot more procedures called to get something done.

Tk provides the "tkwait" and "grab" commands, which should enable you
to do what you want.

>Also what is the equivalent of the append ( >> operator) command using TCL?

Not sure that I understand you, but you can open files for append using the
"a" option to open.  You can append elements to lists with the lappend
command.
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