In Visual FoxPro, preventing a grid from scrolling beyond the last record

 In Visual FoxPro, preventing a grid from scrolling beyond the last record (which causes the grid to display blank space) can be a bit tricky. The behavior you're experiencing happens because the grid is trying to adjust the scrollbar position and make the last record fully visible. However, you can control this behavior with some custom code.

Solution Overview:

To achieve this, you'll need to modify the AfterRowColChange event of the grid to control the scrolling. The basic idea is to detect when the user is attempting to scroll beyond the last record and then programmatically reset the scrollbar to keep the grid's last record visible without the unwanted blank space.

Step-by-Step Implementation:

1. Create a New Form with a Grid:

   • Start by creating a new form with a grid that is bound to a table or cursor with some records.

2. Add Custom Code to the Grid:

   • In the grid's AfterRowColChange event, add code to control the scrolling behavior.

Here is an example:

** Assuming your Grid is named "grdMyGrid" and is bound to a table or cursor.
** Add this code to the Grid's AfterRowColChange event:

LPARAMETERS nColIndex

LOCAL lnTopRecord, lnTotalRecords

lnTopRecord = THIS.TOPROW
lnTotalRecords = RECCOUNT()

** Check if the top row is beyond the last record
IF lnTopRecord + THIS.VisibleRowCount - 1 > lnTotalRecords
    ** Adjust the grid to prevent scrolling beyond the last record
    THIS.TOPROW = lnTotalRecords - THIS.VisibleRowCount + 1
    IF THIS.TOPROW < 1
        THIS.TOPROW = 1
    ENDIF
ENDIF

3. Explanation of the Code:
   • THIS.TOPROW is the property of the grid that determines which record is the top visible record in the grid.
   • THIS.VisibleRowCount gives the number of rows visible in the grid.
   • The IF condition checks if the sum of TOPROW and VisibleRowCount exceeds the total number of records (RECCOUNT()).
   • If it does, TOPROW is adjusted to keep the grid within the bounds of the data.

Additional Considerations:

• Pagination and Filtering: If you're using any filtering or pagination mechanism, ensure that the logic above accounts for the correct record count and visible rows.

• Testing and Debugging: Since this approach manipulates the grid's behavior, thoroughly test the solution with varying amounts of data to ensure smooth operation.

This code should prevent the grid from scrolling past the last record, thus avoiding the appearance of blank space at the bottom of the grid. If you're following the approach in "1001 Things You Wanted to Know About VFP," this code aligns with the concepts discussed but simplifies the implementation for your specific issue.