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Practical Programming in Tcl & Tk, Third Edition
By Brent B. Welch

Table of Contents
Chapter 48.  Tcl 7.4/Tk 4.0


Listboxes

Listboxes changed quite a bit in Tk 4.0. See Chapter 32 for all the details. There are now four Motif-like selection styles, and two of these support disjoint selections. The tk_listboxSingleSelect procedure no longer exists. Instead, configure the selectMode attribute of the listbox. A listbox has an active element, which is drawn with an underline. It is referenced with the active index keyword.

The selection commands for listboxes have changed. Change:

$listbox select from index1
$listbox select to index2

to:

$listbox select anchor index1
$listbox select set anchor index2

The set operation takes two indices, and anchor is a valid index, which typically corresponds to the start of a selection.

You can selectively clear the selection, and query if there is a selection in the listbox. The command to clear the selection has changed. It requires one or two indices. Change:

$listbox select clear

to:

$listbox select clear 0 end

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