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For 2023 - we are now fully retired from IT training.
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I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Sticky news

In a Tk appllication, you'll define a number of widgets (components) that you want in your GUI - your "Graphic User Interface". That's all very well and good, but you'll also want to arrange them neatly and you'll do this with a geometry manager. of which there are three.

The pack geometry manager adds widgets to your window from either side, or from the top and bottom, one at a time - so they form a single row or column. The place geometry manager places widgets at a specific offset within the frame and is the least commonly used of the three by a long way. The grid geometry manager allows you to place whole rows and columns of components in a grid.

With the grid geometry manager, all the cells in a row have to be the same height and all the cells in a column have to be the same width. Otherwise it just wouldn't BE a grid. So how does Tk handle individual component size variation?

By default, each column is made as wide as the widest component in it, and each row is made as tall as the tallest component. Smaller components are then centred in their cells, with the space (padding) distributed equally around all four sides.

If you don't want the space evenly distributed, you can use the -sticky option on your grid command to stick the component to the various sides ...
N - Stick to the top (North)
S - Stick to the bottom (South)
E - Stick to the right (East)
W -Stisck to the left (West).
For example -sticky NW will place the widget in the top right corner of its cell.

To stretch a widget, you may specify that it's to stick to two opposite sides, and to stretch it to fill the cell you can stick it to all four sides - thus -sticky news

(written 2005-09-15, updated 2006-06-05)

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)
  [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)
  [1470] fill and expand on Tcl/Tk pack command - (2007-12-13)

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