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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Managing the window size (and layout) in Tcl/Tk

Complex window layouts are comprised in a series of simple window layouts nested within each other - as an example I wrote today on our Tcl/Tk course. You can see a capture of this display in with this article.

The buttons on the left are in a frame of their own, and the graphic area ("Canvas") across on the right is in a separate frame - the frames being named .left and .right, and the widgets within them things like .left.mkm and .left.quit and .right.graph, so that the geomentry manager knows where they fit in the heirarcy.

One of the requirements of this appliaction is that we limit resizing so that the GUI window cannot be shrunk below its initial size, and we've done that using the following code:
  set size [wm geometry .]
  regexp {(\d+)x(\d+)} $size all w h
  wm minsize . $w $h

Which is reading the size that the window is initially set to, and then saying that the window manager should not reduce below that. One thing you need to be sure of before you ask for the size of the window is that it has actually been renedered on the screen, and as Tk only draws when its event loop is empty, or on specific request, you will probably need to add:
  update idletasks
in your code just before asking for the geometry size.

Complete source code at [here]. Other examples of nested frames at [here] and [here].

(written 2015-03-12, updated 2015-03-15)

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)
  [1335] Expanding a grid - Tcl/Tk - (2007-09-07)
  [1471] Cliff Lift simulator- Lynton to Lynmouth - in Tcl/Tk - (2007-12-14)

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Rail Conference, Nottingham
Server program written in Tcl using sockets
Reading from a URL, and reading Json, from your Tcl script
Using Object Oriented Tcl and the Tk toolkit together - real life example
Managing the window size (and layout) in Tcl/Tk
A new Tcl/tk example - a window to show system status
Test framework for TCL - Tcltest - some examples
Objects in Tcl - iTcl - updated first steps example
Working out distance between places, using OS grid references and a program in Tcl
Everything is a string - even a list
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