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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
fill and expand on Tcl/Tk pack command

pack .this .that -expand true -fill both

Why are there two different options expand and fill? Are they both needed?

expand causes a widget to expand to fill the space available as a window is stretched, and fill causes a widget to be filled to the cell so that it lines up with other widgets.

In order to show you the difference graphically, I wrote this demonstration program:

button .this -text "this" -command exit
button .that -text "Something unthis" -command exit
 
if {$argv == 1} {
  pack .this .that
  puts stderr "Neither fill nor expand"
  # small buttons in one side of window
} elseif {$argv == 2} {
  pack .this .that -fill both
  puts stderr "No expand but with fill"
  # button widths match
} elseif {$argv == 3} {
  pack .this .that -expand true
  puts stderr "No fill but with expand"
  # buttons distributed through window
} elseif {$argv == 4} {
  pack .this .that -expand true -fill both
  puts stderr "Both fill and expand"
  # buttons expanded to truely fill window
} else {
  puts stderr "Usage: $argv0 \[1|2|3|4\]"
  exit
}


Neither, and just "expand" ...



"fill", and both ...

(written 2007-12-13)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T218 - Tcl/Tk - Geometry Managers
  [212] Tcl/Tk (wish) Grid layout example - (2005-02-12)
  [445] Sticky news - (2005-09-15)
  [787] Tk - laying out your GUI with frames, pack and grid - (2006-06-30)
  [1335] Expanding a grid - Tcl/Tk - (2007-09-07)
  [1340] Tk locks up - 100% c.p.u. on a simple program (Tcl, Perl, Python) - (2007-09-09)


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fill and expand on Tcl/Tk pack command
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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