For 2021 - online Python 3 training - see ((here)).
Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7. We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.
Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc. |
Making a variable dynamically visible in a Tcl/Tk GUI
set bill "and Ben"
label .about -textvariable bill
button .first -text "First" -command {set bill Bradshaw}
button .second -text "Second" -command {set bill Bailey}
button .done -text quit -command exit
pack .about .first .second .done
Tcl/Tk's -textvariable option, on commands like label and button, allows you to have the contents of a variable display within you GUI (Graphic User Interface) ... and simply changing the value in the variable will change your display.
Quick, elegant, easy to program and easy to maintain. (written 2007-12-15, updated 2007-12-16)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles T224 - Tcl/Tk - Events in Tk [386] What is a callback? - (2005-07-22) [3575] Multiple buttons calling the same proc in wish (tcl/tk) - (2012-01-12) [4258] Keeping you Tkinter display up to date while monitoring - (2014-04-06)
Some other Articles
Decisions - small ones, or big ones?Shopping for Christmas and looking forwardTcl/Tk - updating your display while tasks are runningUsing Tcl/Tk resource files for flexible applicationsMaking a variable dynamically visible in a Tcl/Tk GUIThe Horse goes on and onCliff Lift simulator- Lynton to Lynmouth - in Tcl/Tkfill and expand on Tcl/Tk pack commandCurley brackets v double quotes - Tcl, Tk, ExpectLexical v Arithemetic testing, Bash and Perl
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This is a page archived from The Horse's Mouth at
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