Q59724: List Box Width Can Be Only 14-55 Characters in 7.00 UI Toolbox

Article: Q59724
Product(s): See article
Version(s): 7.00
Operating System(s): MS-DOS
Keyword(s): ENDUSER | SR# S900222-126 | mspl13_basic
Last Modified: 26-MAR-1990

The ListBox() function of the WINDOW.BAS toolbox file takes two
parameters: a string array containing the list of items to be
displayed, and an integer variable containing the number of items in
the list.

The header comment of the ListBox() function describes how to add a
third parameter, an integer variable (BoxWidth%) that contains the
desired width of the list box to be displayed. Unless this parameter
is added, the width of the list box always defaults to 14 characters.
However, even if this parameter is given, the width cannot be less
than 14 or greater than 55 characters. The ListBox() function ensures
that the width is within this range.

This information applies to the User Interface (UI) Toolbox in
Microsoft BASIC Professional Development System (PDS) Version 7.00 for
MS-DOS.

After adding the modification that allows the desired list box width
to be specified, a sample invocation of the ListBox() function would
be as follows

   x% = ListBox(text$(),MaxRec%,BoxWidth%)

where:

   x%         is the array element selected from the list box
   text$()    is the string(s) to display in the list box
   MaxRec%    is the number of strings to display in the list box
   BoxWidth%  is the desired width of the list box

If BoxWidth% is less than 14, ListBox() changes it to 14. If BoxWidth%
is greater than 55, ListBox() changes it to 55. The statements that
perform these checks are located toward the end of the function under
the subroutine heading ListBoxWidthCalc:

   IF BoxWidth < 14 THEN BoxWidth = 14
   IF BoxWidth > 55 THEN BoxWidth = 55

It is NOT recommended that you change or delete these IF statements to
allow any list box width. If the width is too small, the OK and Cancel
buttons may not fit in the list box. If the width is too large, the
resulting list box may not fit on the screen.

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