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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.
Expanding a grid - Tcl/Tk

Have you ever tried to fill or expand a grid in Tcl/Tk to fill the available space left by wider or taller widgets to the die, or when the window expands, and got results like those I have posted here? Disappointing results, aren't they? And I appear to have done all that I should in the source too:


label .title -text "This is a label" -relief ridge
frame .boxes
label .boxes.tl -text A -relief sunken
label .boxes.tr -text B -relief raised
label .boxes.bl -text C -relief flat
button .boxes.br -text D -relief groove -command exit
 
pack .title .boxes -fill both -expand yes
grid .boxes.tl .boxes.tr -sticky news
grid .boxes.bl .boxes.br -sticky news


The problem lies in the fact that Tk doesn't know HOW to expand the grid.

This is the improved - filled - version; I have used rowconfigure and columnconfigure on the grid command to specify how the extra space is to be distributes - evenly on the verticals and unevenly on the horizontals, as a demonstration.


Here are the extra 3 lines of code:

grid rowconfigure .boxes {0 1} -weight 1
grid columnconfigure .boxes 0 -weight 3
grid columnconfigure .boxes 1 -weight 1


This example is also useful to illustrate some of the different decoration types - "reliefs" - that can be applied to widgets. In a production piece of code, you would use only one or two of them - this training example is illustrative but will make the "look and feel" team shudder!
(written 2007-09-07)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T220 - Tcl/Tk - Frames and Other Topics
  [787] Tk - laying out your GUI with frames, pack and grid - (2006-06-30)
  [1471] Cliff Lift simulator- Lynton to Lynmouth - in Tcl/Tk - (2007-12-14)
  [4459] Managing the window size (and layout) in Tcl/Tk - (2015-03-12)

T218 - Tcl/Tk - Geometry Managers
  [212] Tcl/Tk (wish) Grid layout example - (2005-02-12)
  [445] Sticky news - (2005-09-15)
  [1340] Tk locks up - 100% c.p.u. on a simple program (Tcl, Perl, Python) - (2007-09-09)
  [1470] fill and expand on Tcl/Tk pack command - (2007-12-13)


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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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