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  1. #1
    Remster is online now Competent Performer
    Windows 10 Office 365
    Join Date
    Sep 2010

    Record selection with the vertical scrollbar on a continuous subform

    I want to share something I've discovered completely by chance that helps to answer a question I've seen asked on various forums but never seen answered. I realise I may be reinventing the wheel here.

    The question is whether it's possible to use the vertical scrollbar on a continuous form to select records, so the uppermost record is always the current record. By default, the vertical scrollbar on a continuous form scrolls through the records in a sense, but it doesn't change which record is the current record, and it doesn't change which records are visible on the screen until the first or last visible record has been passed.

    The chance discovery is that during screen painting, the form's bookmark becomes out of sync with the recordset's bookmark, because the form's bookmark changes as each row is painted. This means that when the current record leaves the first row through scrolling (.CurrentSectionTop > 0), you can sync the bookmarks (.Recordset.Bookmark = .Bookmark), and then use a well known method to calculate how many records to move through the recordset to make the uppermost record the current record (.Recordset.Move -Round(.CurrentSectionTop / .Section(acDetail).Height).

    Here's the code snippet:

    Private Sub Detail_Paint()
        If Me.CurrentSectionTop > 0 Then
            Me.Recordset.Bookmark = Me.Bookmark
            Me.Recordset.Move -Round(Me.CurrentSectionTop / Me.Section(acDetail).Height)
        End If
    End Sub
    I've attached an example that illustrates how this might be used in a master/parent navigation form.

Please reply to this thread with any new information or opinions.

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