BUG: READ DEACTIVATE Runs When BROWSE Called From VALID of GET

ID: Q129229

The information in this article applies to:

• Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a, 6.0

SYMPTOMS

In a READ with a DEACTIVATE clause, calling a BROWSE from the VALID clause of a GET triggers the READ DEACTIVATE clause.

CAUSE

As the active window changes, the READ DEACTIVATE is executed. In FoxPro version 2.x, the READ DEACTIVATE is not called when the BROWSE is executed from the VALID clause of the GET.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

RESOLUTION

An alternative is to modify your code to use a Form and a Grid instead of the BROWSE command. The Grid object is part of the form and interacts with all of the objects in a form. Another option is to code a special case in the READ DEACTIVATE clause. For example, you could set a flag when the BROWSE is first activated. In the READ DEACTIVATE, verify the value of the variable, and if the BROWSE has been called, RETURN .F. from the READ DEACTIVATE. The following sample code illustrates this method:

   *Declare a variable that will control whether the READ DEACTIVATE
   * returns .T.
   cDeactBrow=.f.
   CREATE TABLE test (one c(6) , two C(20))
   APPEND BLANK

   DEFINE WINDOW wintest FROM 1,1 TO 20,20 FLOAT GROW ZOOM
   ACTIVATE WINDOW wintest
   @ 1,1 GET nvar DEFAULT 1 PICTURE "@*N Show Browse" VALID browser()
   READ CYCLE MODAL ;
   DEACTIVATE readdeact()

   CLEAR WINDOWS

   PROCEDURE browser
   cDeactBrow=.f.
   BROWSE NORMAL

   PROCEDURE readdeact
   WAIT WINDOW "READ DEACT Shouldn't be called"
   IF cDeactBrow=.F. &&Case where you are in the VALID clause of the GET
       RETURN .F.
       cDeactBrow=.T. && Reset the variable
       ELSE
       RETURN .T.
   ENDIF

MORE INFORMATION

This illustrates a behavioral difference between FoxPro versions 2.x and Visual FoxPro version 3.0 for Windows. Because the BROWSE window is different from the READ window, the behavior exhibited in Visual FoxPro for Windows seems more logical.

For more information about differences between FoxPro 2.x and Visual FoxPro version 3.0, search for "Differences Between FoxPro 2.6 and Visual FoxPro" using the FoxPro Help menu.

Additional query words: grid kbvfp300 kbvfp500 kbvfp600

Keywords          : kbcode kbVFp300bbug kbVFp500abug kbVFp500bug buglist3.00 FxprgBrowse kbbuglist
Version           : WINDOWS: 3.0,3.0b,5.0,5.0a,6.0
Platform          : WINDOWS
Issue type        : kbbug