FIX: Error Changing Grid s DynamicBackColor & DynamicForeColor

ID: Q132534

3.00 3.00b WINDOWS kbtool kbbuglist kbfixlist

The information in this article applies to:

Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b

SYMPTOMS

You get the following error when changing the DynamicBackColor and DynamicForeColor in a grid that has a class object added to a column and that class object is the active control with the Sparse Property set to false (.F.):

   Expression evaluated to an illegal value

RESOLUTION

Change either the DynamicBackColor or the DynamicForeColor but not both. Or use the default controls that the Form Builder offers.

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article. This problem has been fixed in Visual FoxPro 5.0 for Windows.

MORE INFORMATION

Steps to Reproduce Problem

1. Create a new class named CenterChk based on Container, and store it in

   Mylib.vcx.

2. In the Class Designer, set the following properties for the container:

   Height = 19
   Width = 68
   BackStyle = 0-Transparent
   BorderWidth = 0

3. From the Form Controls toolbar, select the check box Control, and place

   a check box in the container.

4. Set the following Properties for the check box:

   BackStyle 0-Transparent
   Height = 16
   Caption = ""
   Width = 14

5. With the check box selected, click Center Horizontally and Center

   Vertically on the Format menu. Then save and close the class.

6. Open the Tastrade.dbc in the VFP\Samples\Mainsamp\Data directory.

7. Create a new form called TestGrid, and add a new property to the form

   called nCurRec.

8. Using the right mouse button, click the form to bring up the Data

   Environment. Then using the right mouse button, click the Data
   Environment. Click Add, and add the Products table.

9. From the Form Controls toolbar, select the Grid control, and add a grid

   to the form.

10. Using the right mouse button, click the grid, and choose Builder. From

    the Grid Builder, select the Products table. From the Available Fields,
    select Product_id, Product_name, and Discontinued.

11. Close the Builder by clicking OK.

12. Set the following Property for the grid:

    RowHeight = 19

13. Using the right mouse button, click the grid, then click Edit.

14. From the Form Controls toolbar, click the View Classes button and

    choose Add. Select Mylib.vcx from the Open dialog box. From the Form
    Controls Toolbar, select the CenterChk control, and add it to the
    Discontinued Column on the grid.

15. Set the following Properties for Column 3 in the grid:

    CurrentControl CenterChk1
    Width = 68
    Sparse = .F.

16. Set the following Property for Column 3 CenterChk1 Check1 in the grid:

    ControlSource = products.discontinued

17. Add the following code to the Init event of the grid:

    THISFORM.nCurRec = RECNO()
    THISFORM.Grid1.SETALL('DynamicBackColor',;
       'IIF(THISFORM.nCurRec == RECNO(), rgb(0,0,128), rgb(255,255,0))',;
       'Column')
       THISFORM.Grid1.SETALL('DynamicForeColor', ;
          'IIF(THISFORM.nCurRec == RECNO(), rgb(0,0,255), rgb(0,0,0))', ;
          'Column')
       THIS.REFRESH

18. Add the following code to the AfterRowColChange event of the grid:

    THISFORM.nCurRec = RECNO()
    THIS.REFRESH

19. Save and run the form.

For more information on creating forms, please see Chapter 9 in the Developer's Guide. For more information on creating classes, please see Chapt1er 10 in the Developer's Guide. And for more information on using controls on a form, please see Chapter 11 in the Developer's Guide.

KBCategory: kbtool kbbuglist kbfixlist KBSubcategory: FxtoolSbuilder fixlist5.00 VFoxWin buglist3.00 buglist3.00b Additional reference words: 3.00 3.00b

Keywords          : kbVFp kbVFp300bbug kbVFp500fix buglist3.00 FxtoolSbuilder kbbuglist kbfixlist
Version           : 3.00 3.00b
Platform          : WINDOWS
Solution Type     : kbfix