Updated 2016-02-07 19:39:30 by HJG

PT posted this application of the text widget in comp.lang.tcl:
    package require Tk
    text      .t -yscrollcommand {.s set}
    scrollbar .s -command        {.t yview}
    pack .s -side right -fill y
    pack .t -side left -fill both -expand 1

    set filename "readme.txt"
    set f [open $filename r]
    set data [read $f]
    close $f

    .t delete 0.0 end
    .t insert 0.0 $data

And Marty Backe posted this as a follow-up:
  package require Iwidgets
  iwidgets::scrolledtext .t
  pack .t -fill both -expand true

  .t insert $filename end

 # To clear the widget between file reads:
  .t clear

HJG 2016-02-07: The first example obviously needed a filename, and the second example doesn't work.

I guess Iwidgets are broken/unmaintained (dated 2002 / tcl 8.3.3). See also scrolledtext.