[Arjen Markus] (4 january 2008) Reading the wishlist for Tk 9.0, I stumbled on a request by [NEM] regarding 
a combination of the [canvas] and the [text] widgets. One idea was to have vertical lines in the text display.

Well, the script below demonstrates how you can do that (in principle at least):

======
# textw.tcl --
#
place [text .t] -x 0 -y 0
tkwait visibility .t
set height [winfo height .t]
set width  [winfo width  .t]
. configure -width $width -height $height
place [canvas .cv -width 0 -height $height -highlightthickness 0] -x [expr {$width/2}] -y 2
place [canvas .ch -width $width -height 0  -highlightthickness 0] -y [expr {$height/2}] -x 2 
======

Drawbacks:

   * If you use [place] in a frame, the frame needs to be resized via [winfo] explicitly (in the same way as the [toplevel] window in the code above)
   * I found out I need to resize the containing toplevel window myself
   * You need to compute the position of the canvases yourself in terms of columns or rows

But then: I only needed Tk 8.4 to do this.

<<categories>> Example]| GUI