Q98367: How to Update Scrollable Lists in FoxBASE+/Mac

Article: Q98367
Product(s): Microsoft Fox Miscellaneous Products
Version(s): MACINTOSH:2.01
Operating System(s): 
Keyword(s): 
Last Modified: 23-OCT-1999

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The information in this article applies to:

- Microsoft FoxBASE+ for Macintosh, version 2.01 
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SUMMARY
=======

The code example below shows one method of updating a scrollable list after an
array element has been modified.

MORE INFORMATION
================

WARNING: ANY USE BY YOU OF THE CODE PROVIDED IN THIS ARTICLE IS AT YOUR OWN
RISK. Microsoft provides this code "as is" without warranty of any kind, either
expressed or implied, including but not limited to the implied warranties of
merchantability and/or fitness for a particular purpose.

This code example uses the following procedures to update the scrollable list:

  GETIT       "Grabs" the element out of the array.
  SHOWIT      Shows the element on the screen for editing.
  PUTITBACK   Puts the modified element in the scrollable list.
  UPDATESCRN  Updates the screen.

NOTE: Because FoxBASE+/Mac does not allow for nested READs, the READ must be
terminated before the DO SHOWIT and DO UPDATESCRN commands can be issued.

     *Start with a clean environment.
     CLEAR
     CLEAR ALL
     SET TALK OFF
     SET BELL OFF
     *The name of this file is FARM.PRG.
     SET PROCEDURE TO farm

     *Set up memory variables for the GETs.
     DIMENSION farm_var(4)
     STORE "cow" TO farm_var(1)
     STORE "pig" TO farm_var(2)
     STORE "chicken" TO farm_var(3)
     STORE "horse" TO farm_var(4)
     STORE 0 to whichanimal,complete
     STORE space(15) TO editanimal,mvar
     STORE .F. TO done,flag1,flag2

     ON KEY=13 DO dostopit
     DO WHILE ! done
     SCREEN 1 TOP
     @ PIXELS 80,80 GET whichanimal FROM farm_var SIZE 80,80;
       VALID getit(whichanimal)
     @ PIXELS 160,200 GET mvar
     @ PIXELS 200,140 GET complete PICTURE "@*H Done";
       VALID stopit(complete)
     READ
     IF flag1           && When flag1 is true,
        DO showit       && do procedure(s) to show and edit choice.
     ENDIF
     IF flag2           && When flag2 is true,
        DO updatescrn   && do procedure to update the screen.
     ENDIF
     ENDDO

     *Procedure to grab the element out of the array
     PROCEDURE getit
     PARAMETER theanimal
     STORE farm_var(theanimal) TO editanimal
     STORE .T. TO flag1  && Set flag1 to true to do showit.
     KEYBOARD CHR(23)    && Terminate the READ.
     RETURN .T.

     *Procedure to show the element on the screen for editing
     PROCEDURE showit
     @ PIXELS 200,140 CLEAR   && Hide the Done text button.
     @ PIXELS 160,200 CLEAR   && Hide mvar.
     *Keep the GETs the same length.
     x=15 - LEN(editanimal)
     editanimal = editanimal + space(x)
     @ PIXELS 120,200 GET editanimal VALID putitback(editanimal)
     READ
     RETURN

     *Procedure to replace the element in the scrollable field
     PROCEDURE putitback
     PARAMETER manimal
     STORE TRIM(LOWER(manimal)) TO farm_var(whichanimal)
     STORE .F. TO flag1   && Do not go through PROCEDURE showit again.
     STORE .T. TO flag2   && Set flag2 true to do updatescrn.
     KEYBOARD CHR(23)     && Terminate READ.
     RETURN .T.

     *Procedure to the update the screen
     PROCEDURE updatescrn
     CLEAR
     KEYBOARD CHR(9)     && TAB to next field.
     STORE .F. TO flag2  && Do not go through PROCEDURE updatescrn again.
     RETURN

     *Procedure to stop the program with a RETURN
     PROCEDURE dostopit
     STORE 1 TO complete
     DO stopit WITH complete

     *Procedure to stop the program
     PROCEDURE stopit
     PARAMETER mcomplete
     IF mcomplete=1
        *Restore the environment.
        ON KEY
        CLEAR ALL
        SCREEN 2 TOP OFF
        SCREEN 1 DELETE
        SCREEN 1 TOP
        CANCEL
     ENDIF
     *End program.

Additional query words: 2.01 scroll list

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Keywords          :  
Technology        : kbHWMAC kbOSMAC kbAudDeveloper kbFoxproSearch kbFoxBASE201Mac kbFoxBASESearch
Version           : MACINTOSH:2.01

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