How to have VBA code wait until vbModeless userform is closed

Question

I'd like to use a formless userform so the user can navigate the excel sheet before answering the question on the userform. I need to pause or loop the code until the userform is closed (hidden or unloaded).

Similar issue to this: How can I wait for a specific code to run while when form is closed and is set to vbModeless? but the solution here does not work for my application; My userform is opened in the middle of a long subroutine which needs to finish executing after the userform is closed.

Dim popupActive as Boolean

popupActive = True
StartingSINT_Popup.Show vbModeless 'Open userform

'have VBA code wait until userform is closed
wait until popupActive = False 'set to false with OK button on userform

'continue code with info input inside StartingSINT_Popup userform

Answer 1

I didn't author the following function, but I have used it for a long time and it works.

Private Function IsLoaded(ByVal formName As String) As Boolean
    Dim frm As Object
    For Each frm In VBA.UserForms
        If frm.Name = formName Then
            IsLoaded = True
            Exit Function
        End If
    Next frm
    IsLoaded = False
End Function

You will need to hardcode the string name, and not use the .Name property of the form because the form may not be loaded yet and not contain this property.

Here is a small snippet of how you can use this function:

Do While IsLoaded("StartingSINT_Popup")
    Debug.Print Time; " StartingSINT_Popup Is Loaded!"
Loop

Answer 2

My userform is opened in the middle of a long subroutine which needs to finish executing after the userform is closed.

Your procedure is doing too many things and needs to be broken down into smaller, more specialized procedures.

The correct way to do this, is to shift the paradigm from procedural to event-driven.

Instead of showing the form's default instance like this:

StartingSINT_Popup.Show vbModeless 'Open userform

Have a class module that holds a WithEvent instance of it:

Private WithEvents popup As StartingSINT_Popup

Private Sub Class_Initialize()
    Set popup = New StartingSINT_Popup
End Sub

Public Sub Show()
    popup.Show vbModeless
End Sub

Private Sub popup_Closed()
    ' code to run when the form is closed
End Sub

In the form's code-behind, declare a Closed event:

Public Event Closed()

And then raise it in the QueryClose handler:

Private Sub UserForm_QueryClose(Cancel As Integer, CloseMode As Integer)
    If CloseMode = 0 Then 'controlbox was clicked (the "red X button")
        Cancel = True 'would otherwise destroy the form instance
        Me.Hide 'always hide, never unload
    End If
    RaiseEvent Closed
End Sub

Now say you named that class PopupPresenter, your procedure can now do this:

Private presenter As PopupPresenter

Public Sub DoStuff()
    Set presenter = New PopupPresenter

    'do stuff...

    presenter.Show

    'rest of the code in this scope will run immediately AND THIS IS FINE

End Sub

Keep the presenter at module level so that the object doesn't go out of scope when DoStuff finishes, and pass any variables/values or state that the presenter object needs to do its job when the form is closed. You can do this by exposing properties or public fields/variables (prefer properties though, but that's a whole other topic):

Private WithEvents popup As StartingSINT_Popup
Public Foo As String

Private Sub Class_Initialize()
    Set popup = New StartingSINT_Popup
End Sub

Public Sub Show()
    popup.Show vbModeless
End Sub

Private Sub popup_Closed()
    ' code to run when the form is closed
    MsgBox Foo
End Sub

Private presenter As PopupPresenter

Public Sub DoStuff()
    Set presenter = New PopupPresenter

    'do stuff...

    presenter.Show
    presenter.Foo = "some data"

    'rest of the code in this scope will run immediately AND THIS IS FINE

End Sub