7-3-92

Because of the many responses to the previous version of the virtual listbox
demo, and also because of this old dog learning some new tricks, I have put
together this new and (hopefully) improved version.

NEW WITH THIS RELEASE
1.Since the sample database is so small (300+ records) the VListBox class
uses shorts this time for the GetText function. This will also make it
quicker for you to implement in your own code, since you won't need to
modify TV.LIB and all class derived from TListViewer (of which there are
many!) to accomodate longs.

Please bear in mind, however if you need to create a virtual list with
potentially more items than a short will tolerate, you will need to make
the change.

Also note that the listbox does not "own" the database class any longer.
The listbox is passed the address to the database, and it is accessed
through a "pointer to a pointer." This is also the case with the Edit
dialog box.

2.I have added a simple search function to the browse window. You can
search by record number when the index is not specified, or by last
name if the index is selected.

3.The Edit dialog box (accessed by pressing "Enter" on the focused item of
the listbox) now allows for the comparison, editing, deleting, and restor-
ing of two separate records.

4.The basic concept behind the virtual list box is quite simple. TListViewer
draws the list, and when it does it calls GetText(char *dest, short item,...). Draw()
wants a string back, preferably the string associated with that item in
some list. What you put in that string is up to you. How you get the
string is also up to you, as is keeping track of where you are in the list.


In the zip file are all the .CPP and .HPP files used to build the demo.
However, since the database used is a dBase file, accessed through CodeBase++,
you will not be able to compile the examples unless you have the CodeBase++
libraries.

If you have any questions, please feel free to leave me a message or call me
directly.

Gregory K. Miskin
(801) 226-3142