Generic MouseWheel Scroll for UserForm and for ALL its Controls !

Jaafar Tribak

Jaafar Tribak

Well-known Member
Joined
Dec 5, 2002
Messages
9,779
Office Version
  1. 2016
Platform
  1. Windows
Hi all,
Below is a code for scrolling all controls in a userform with the Mouse Wheel

Should work with Modal as well as with Modeless userforms .. Tested in 32Bit and 64Bit systems .. Also, the code doesn't use a Windows hook so it should be stable and safe.

See Workbook Demo

1- Code in a Standard Module :
Code: 
Option Explicit

Public Enum CTRL_KEY_PRESS_STATE
    Released
    Pressed
End Enum

Public Enum WHEEL_ROTATION
    Forward
    Backward
End Enum

Private Type POINTAPI
  X As Long
  Y As Long
End Type

Private Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type

Private Type LongToInteger
    Low As Integer
    High As Integer
End Type

#If VBA7 Then
    Private Type MSG
        hwnd As LongPtr
        message As Long
        wParam As LongPtr
        lParam As LongPtr
        time As Long
        pt As POINTAPI
    End Type
    
    Private Declare PtrSafe Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As LongPtr
    Private Declare PtrSafe Function GetDeviceCaps Lib "gdi32" (ByVal hdc As LongPtr, ByVal nIndex As Long) As Long
    Private Declare PtrSafe Function GetDC Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Private Declare PtrSafe Function ReleaseDC Lib "user32" (ByVal hwnd As LongPtr, ByVal hdc As LongPtr) As Long
    Private Declare PtrSafe Function ClientToScreen Lib "user32" (ByVal hwnd As LongPtr, lpPoint As POINTAPI) As Long
    Private Declare PtrSafe Function GetParent Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal Point As LongPtr) As LongPtr
    Private Declare PtrSafe Function GetNextWindow Lib "user32" Alias "GetWindow" (ByVal hwnd As LongPtr, ByVal wFlag As Long) As LongPtr
    Private Declare PtrSafe Function GetWindowRect Lib "user32" (ByVal hwnd As LongPtr, lpRect As RECT) As Long
    Private Declare PtrSafe Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As MSG, ByVal hwnd As LongPtr, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long
    Private Declare PtrSafe Function WaitMessage Lib "user32" () As Long
    Private Declare PtrSafe Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As LongPtr, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Private Declare PtrSafe Function GetCursorPos Lib "user32.dll" (lpPoint As POINTAPI) As Long
    Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
    Private Declare PtrSafe Sub ZeroMemory Lib "kernel32" Alias "RtlZeroMemory" (dest As Any, ByVal numBytes As LongPtr)
    Private Declare PtrSafe Function IsBadCodePtr Lib "kernel32" (ByVal lpfn As LongPtr) As Long
#If Win64 Then
     Private Declare PtrSafe Function AccessibleObjectFromPoint Lib "oleacc" (ByVal arg1 As LongPtr, ppacc As Any, pvarChild As Variant) As Long
#Else
     Private Declare PtrSafe Function AccessibleObjectFromPoint Lib "oleacc" (ByVal lX As Long, ByVal lY As Long, ppacc As IAccessible, pvarChild As Variant) As Long
#End If

#Else
    Private Type MSG
        hwnd As Long
        message As Long
        wParam As Long
        lParam As Long
        time As Long
        pt As POINTAPI
    End Type
    Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal nIndex As Long) As Long
    Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
    Private Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
    Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
    Private Declare Function GetNextWindow Lib "user32" Alias "GetWindow" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
    Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
    Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
    Private Declare Function ClientToScreen Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As Long
    Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long
    Private Declare Function WaitMessage Lib "user32" () As Long
    Private Declare Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As MSG, ByVal hwnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long
    Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
    Private Declare Function AccessibleObjectFromPoint Lib "Oleacc" (ByVal lX As Long, ByVal lY As Long, ppacc As IAccessible, pvarChild As Variant) As Long
    Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
    Private Declare Sub ZeroMemory Lib "kernel32.dll" Alias "RtlZeroMemory" (Destination As Any, ByVal Length As Long)
    Private Declare Function IsBadCodePtr Lib "kernel32" (ByVal lpfn As Long) As Long
#End If
 
Private Const CHILDID_SELF = &H0&
Private Const S_OK As Long = &H0
Private Const POINTSPERINCH As Long = 72
Private Const LOGPIXELSX As Long = 88
Private Const LOGPIXELSY As Long = 90
Private Const WM_MOUSEWHEEL = &H20A
Private Const PM_REMOVE = &H1
Private bCancelProcessing As Boolean
Private Const MK_CONTROL = &H8
Private Const SCROLL_CHANGE = 10

Private arObjCaptions() As Variant
Private arObjPointers() As Variant

Public Sub HookMouseWheelScroll(ByVal UF As Object)
    Dim WheelRotation As WHEEL_ROTATION
    Dim CtrlKey As CTRL_KEY_PRESS_STATE
    Dim tMsg As MSG
    Dim tCurPos As POINTAPI
    Dim oIA As IAccessible
    Dim oObjUnderMouse As Object
    Dim oPage As Object
    Dim oCtrl As Object
    Dim vKid  As Variant
    Dim i As Long
    Dim j As Long
    Dim lResult As Long
    Dim bCancel As Boolean
    Static k As Long
    #If VBA7 Then
        Dim Ptr As LongPtr
    #Else
        Dim Ptr As Long
    #End If
    
    bCancelProcessing = False
    k = 0
    UF.Caption = UF.Caption & Chr(10)
    j = 0
    Erase arObjCaptions
    Erase arObjPointers
    For Each oCtrl In UF.Controls
        If TypeName(oCtrl) = "MultiPage" Then
            For Each oPage In oCtrl.Pages
                i = i + 1
                oPage.Caption = oPage.Caption & String(i, Chr(10))
                ReDim Preserve arObjCaptions(j)
                ReDim Preserve arObjPointers(j)
                arObjCaptions(j) = oPage.Caption & Chr(10)
                arObjPointers(j) = ObjPtr(oPage)
                j = j + 1
            Next
        End If
    Next
    Do While Not bCancelProcessing
        DoEvents
        GetCursorPos tCurPos
        #If Win64 Then
            CopyMemory Ptr, tCurPos, LenB(tCurPos)
            lResult = AccessibleObjectFromPoint(Ptr, oIA, vKid)
        #Else
            lResult = AccessibleObjectFromPoint(tCurPos.X, tCurPos.Y, oIA, vKid)
        #End If
        If lResult = S_OK Then
            On Error Resume Next
            Set oObjUnderMouse = objUnderMouse(UF, oIA, tCurPos)
            If Not oObjUnderMouse Is Nothing Then
                WaitMessage
                If PeekMessage(tMsg, 0, WM_MOUSEWHEEL, WM_MOUSEWHEEL, PM_REMOVE) Then
                    CtrlKey = IIf(LoWord(CLng(tMsg.wParam)) = MK_CONTROL, Pressed, Released)
                    WheelRotation = IIf(tMsg.wParam > 0, Forward, Backward)
                    Call UF.OnScrollEvent(oObjUnderMouse, WheelRotation, CtrlKey, tMsg.pt.X, tMsg.pt.Y, bCancel)
                    If Not bCancel Then
                        If TypeName(oObjUnderMouse) = "TextBox" Then
                            With oObjUnderMouse
                                .SetFocus
                                If k = 0 Then
                                    .SelStart = 0
                                Else
                                    .SelStart = IIf(.SelStart = .LineCount, 0, .SelStart)
                                End If
                                If WheelRotation = Forward Then
                                    .CurLine = .CurLine - 1
                                Else
                                    .CurLine = IIf(.CurLine = .LineCount - 1, .CurLine, .CurLine + 1)
                                End If
                            End With
                            k = k + 1
                        End If
                        If TypeName(oObjUnderMouse) = "ScrollBar" Then
                            With oObjUnderMouse
                                If WheelRotation = Forward Then
                                    .Value = IIf(.Value - oObjUnderMouse.SmallChange > .Min, .Value - oObjUnderMouse.SmallChange, .Min)
                                Else
                                    .Value = IIf(.Value + oObjUnderMouse.SmallChange < .Max, .Value + oObjUnderMouse.SmallChange, .Max)
                                End If
                            End With
                        End If
                        If TypeName(oObjUnderMouse) = "ListBox" Or TypeName(oObjUnderMouse) = "ComboBox" Then
                            With oObjUnderMouse
                                If CtrlKey = Released Then
                                    If WheelRotation = Forward Then
                                    .TopIndex = .TopIndex - 1
                                    Else
                                    .TopIndex = .TopIndex + 1
                                    End If
                                Else
                                    .SetFocus
                                    If WheelRotation = Forward Then
                                        SendKeys "{LEFT}", True
                                        DoEvents
                                        SendKeys "{RIGHT}", True
                                    Else
                                        SendKeys "{RIGHT}", True
                                        DoEvents
                                        SendKeys "{RIGHT}", True
                                    End If
                                End If
                            End With
                        End If
                        If TypeName(oObjUnderMouse) = UF.Name Or TypeName(oObjUnderMouse) = "Frame" Or TypeName(oObjUnderMouse) = "Page" Then
                            With oObjUnderMouse
                                If CtrlKey = Released Then
                                    If WheelRotation = Forward Then
                                        .ScrollTop = Application.Max(0, .ScrollTop - 5)
                                    Else
                                        .ScrollTop = Application.Min(.ScrollHeight - .InsideHeight, .ScrollTop + SCROLL_CHANGE)
                                    End If
                                Else
                                    If WheelRotation = Forward Then
                                        .ScrollLeft = Application.Max(0, .ScrollLeft - 5)
                                    Else
                                        .ScrollLeft = Application.Min(.ScrollWidth - .InsideWidth, .ScrollLeft + SCROLL_CHANGE)
                                    End If
                                End If
                            End With
                        End If
                    End If
                    DoEvents
                End If
            End If
        End If
    Loop
End Sub

Public Sub RemoveMouseWheelHook()
    bCancelProcessing = True
End Sub

[B][COLOR=#008000]'Private Routines ..[/COLOR][/B]
[B][COLOR=#008000]'-------------------[/COLOR][/B]
Private Function objUnderMouse(ByVal UF As Object, ByVal oAcc As IAccessible, MouseLoc As POINTAPI) As Object
    #If VBA7 Then
        Dim lngPtr As LongPtr
        Dim lObjPtr As LongPtr
        Dim lCtrlPtr As LongPtr
        Dim hwndForm As LongPtr
        Dim hwndFromPoint As LongPtr
    #Else
        Dim lObjPtr As Long
        Dim lCtrlPtr As Long
        Dim hwndForm As Long
        Dim hwndFromPoint As Long
    #End If
    Dim arCtrlsPosition() As Variant
    Dim arCtrlsPointers() As Variant
    Dim tPt As POINTAPI
    Dim tRect As RECT
    Dim oObj As Object
    Dim oCtrl As Control
    Dim sBuffer As String
    Dim lCtrlLeft As Long
    Dim lCtrlTop As Long
    Dim lPos1 As Long
    Dim lPos2 As Long
    Dim lPos3 As Long
    Dim lRet As Long
    Dim i As Long

    On Error Resume Next
    hwndForm = FindWindow(vbNullString, UF.Caption)
    For Each oCtrl In UF.Controls
        ReDim Preserve arCtrlsPosition(i + 1)
        ReDim Preserve arCtrlsPointers(i + 1)
        tPt = GetRealCtrlScreenLocation(oCtrl, hwndForm, UF)
        arCtrlsPosition(i) = tPt.X & tPt.Y
        arCtrlsPointers(i) = ObjPtr(oCtrl)
        arCtrlsPosition(i + 1) = tPt.X - 2 & tPt.Y - 1
        arCtrlsPointers(i + 1) = ObjPtr(oCtrl)
        i = i + 2
    Next
    lPos1 = WorksheetFunction.Match(oAcc.accName(CHILDID_SELF) & Chr(10), arObjCaptions, 0)
    lObjPtr = WorksheetFunction.Index(arObjPointers, 1, lPos1)
    Call oAcc.accLocation(lCtrlLeft, lCtrlTop, 0, 0, CHILDID_SELF)
    lPos2 = WorksheetFunction.Match(lCtrlLeft & lCtrlTop, arCtrlsPosition, 0)
    lCtrlPtr = WorksheetFunction.Index(arCtrlsPointers, 1, lPos2)
    #If VBA7 Then
        CopyMemory lngPtr, MouseLoc, LenB(MouseLoc)
        hwndFromPoint = WindowFromPoint(lngPtr)
    #Else
        hwndFromPoint = WindowFromPoint(MouseLoc.X, MouseLoc.Y)
    #End If
    sBuffer = Space(256)
    lRet = GetClassName(GetParent(hwndFromPoint), sBuffer, 256)
    lPos3 = InStr(1, Left(sBuffer, lRet), "MdcPopup")
    Select Case True
        Case lPos3 <> 0
            Set objUnderMouse = GetActiveComboBox(UF)
            Exit Function
        Case oAcc.accName(CHILDID_SELF) = UF.Caption
            Set oObj = UF
        Case lObjPtr = 0
            If IsBadCodePtr(lCtrlPtr) = 0 Then
                CopyMemory oObj, lCtrlPtr, 4
            End If
        Case lObjPtr <> 0
            If IsBadCodePtr(lObjPtr) = 0 Then
                CopyMemory oObj, lObjPtr, 4
            End If
    End Select
    Set objUnderMouse = oObj
    If Not oObj Is Nothing Then
        ZeroMemory oObj, 4
    End If
End Function

#If VBA7 Then
    Private Function GetRealCtrlScreenLocation(ByVal Ctl As Object, ByVal hwnd As LongPtr, ByVal UF As Object) As POINTAPI
#Else
    Private Function GetRealCtrlScreenLocation(ByVal Ctl As Object, ByVal hwnd As Long, ByVal UF As Object) As POINTAPI
#End If
    Dim tRect As RECT
    Dim tTopLeft As POINTAPI
    Dim oMultiPage As Control
    Dim oTempObj As Control

    On Error Resume Next
    Set oTempObj = Ctl.Parent
    With tTopLeft
        Select Case True
             Case oTempObj Is Nothing
                .X = PTtoPX(Ctl.Left - UF.ScrollLeft * UF.Zoom / 100, False)
                .Y = PTtoPX(Ctl.Top - UF.ScrollTop * UF.Zoom / 100, True)
                ClientToScreen hwnd, tTopLeft
             Case TypeName(oTempObj) = "Frame"
                GetWindowRect oTempObj.[_GethWnd], tRect
                .X = PTtoPX(Ctl.Left - oTempObj.ScrollLeft * (oTempObj.Zoom / 100), False) + tRect.Left + 2
                .Y = PTtoPX(Ctl.Top - oTempObj.ScrollTop * (oTempObj.Zoom / 100), True) + tRect.Top + 8
            Case TypeName(oTempObj) = "Page"
                Set oMultiPage = oTempObj.Parent
                GetWindowRect GetNextWindow(oMultiPage.[_GethWnd], 5), tRect
                .X = PTtoPX(Ctl.Left - oTempObj.ScrollLeft * (oTempObj.Zoom / 100), False) + tRect.Left
                .Y = PTtoPX(Ctl.Top - oTempObj.ScrollTop * (oTempObj.Zoom / 100), True) + tRect.Top
                Set oMultiPage = Nothing
            End Select
        End With
    GetRealCtrlScreenLocation = tTopLeft
    Set oTempObj = Nothing
End Function

Private Function GetActiveComboBox(ByVal Ctl As Object) As Control
    Dim oCtl As Object
    Dim lCur As Long
    On Error Resume Next
    For Each oCtl In Ctl.Controls
        Err.Clear
        lCur = oCtl.CurX
        If Err.Number = 0 And TypeName(oCtl) = "ComboBox" Then Set GetActiveComboBox = oCtl: Exit Function
    Next
End Function

Private Function LoWord(ByVal Word As Long) As Integer
    Dim X As LongToInteger
    CopyMemory X, Word, LenB(X)
    LoWord = X.Low
End Function

Private Function ScreenDPI(ByVal bVert As Boolean) As Long
    Static lDPI(1), lDC
    If lDPI(0) = 0 Then
        lDC = GetDC(0)
        lDPI(0) = GetDeviceCaps(lDC, LOGPIXELSX)
        lDPI(1) = GetDeviceCaps(lDC, LOGPIXELSY)
        lDC = ReleaseDC(0, lDC)
    End If
    ScreenDPI = lDPI(Abs(bVert))
End Function

Private Function PTtoPX(ByVal Points As Single, ByVal bVert As Boolean) As Long
    PTtoPX = Points * ScreenDPI(bVert) / POINTSPERINCH
End Function

2- Code in the UserForm Module:
Code: 
Option Explicit

Private Sub UserForm_Activate()
    Dim i As Long
    
    [B][COLOR=#008000]'Populate the controls[/COLOR][/B]
    For i = 0 To 100
        With ListBox1
            .ColumnCount = 4
            .ColumnWidths = "100;100;100;100"
            .AddItem "COLUMN1"
            .List(i, 1) = "COLUMN2"
            .List(i, 2) = "COLUMN3"
            .List(i, 3) = "COLUMN4"
        End With
        ListBox2.AddItem i
        ComboBox1.AddItem i
        ComboBox2.AddItem i
        ComboBox3.AddItem i
        ComboBox4.AddItem i
        ComboBox5.AddItem i
        ComboBox6.AddItem i
        ComboBox7.AddItem i
        ComboBox8.AddItem i
        ComboBox9.AddItem i
    Next i
    With TextBox1
        .Text = .Text & String(300, "A")
        .Text = .Text & String(300, "I")
        .Text = .Text & String(300, "X")
    End With
    Label1.Caption = "Object :"
    Label2.Caption = "Wheel Rotation :"
    Label3.Caption = "Scroll Direction :"
    Label4.Caption = "Cursor X :"
    Label5.Caption = "Cursor Y :"
    Label6.Caption = "Scroll Cancelled :"
    
    [B][COLOR=#008000]'Hook MouseWheel Scroll of Form and of all its controls[/COLOR][/B]
    Call HookMouseWheelScroll(Me)

End Sub
Private Sub UserForm_QueryClose(Cancel As Integer, CloseMode As Integer)
    Call RemoveMouseWheelHook
End Sub
Private Sub CommandButton1_Click()
    Unload Me
End Sub
[B][COLOR=#008000]
'-------------------------[/COLOR][/B]
[B][COLOR=#008000]'Public Generic event[/COLOR][/B]
[B][COLOR=#008000]'-------------------------[/COLOR][/B]

Public Sub OnScrollEvent(ByVal Obj As Object, ByVal WheelRotation As WHEEL_ROTATION, _
ByVal CtrlKey As CTRL_KEY_PRESS_STATE, ByVal X As Long, ByVal Y As Long, Cancel As Boolean)

    Dim sObjName As String, sWheelRot As String, sCtrlKey As String
    Dim sCurX As String, sCurY As String, sCancelScrol As String
    
    sObjName = "Object :  (" & Obj.Name & ")"
    sWheelRot = "Wheel Rotation :  (" & IIf(WheelRotation = Forward, "Forward", "Backward") & ")"
    sCtrlKey = "Scroll Direction :  (" & IIf(CtrlKey = Released, "Vert", "Horiz") & ")"
    sCurX = "Cursor X :  (" & X & ")"
    sCurY = "Cursor Y :  (" & Y & ")"
    sCancelScrol = "Scroll Cancelled :  (" & Cancel & ")"
    
    Label1.Caption = sObjName
    Label2.Caption = sWheelRot
    Label3.Caption = sCtrlKey
    Label4.Caption = sCurX
    Label5.Caption = sCurY
    Label6.Caption = sCancelScrol
End Sub
 
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Excel Facts

Is there a shortcut key for strikethrough?
Ctrl+S is used for Save. Ctrl+5 is used for Strikethrough. Why Ctrl+5? When you use hashmarks to count |||| is 4, strike through to mean 5.
TabKeyBehavior (and MultiLine) are set to False on all of the TextBoxes.

But really appreciate the help & suggestion! thx
 
Upvote 0
Yeah, it has to be the mouse code. I just created a couple toggle buttons to turn it on & off. The tab behavior works fine when the mouse scroll is disabled, and breaks when enabled.

VBA Code: 
Private Sub CommandButton1_Click()

EnableWheelScroll(Me) = False

End Sub

Private Sub CommandButton2_Click()

EnableWheelScroll(Me) = True

End Sub
 
Upvote 0
I'm trying to implement the code from #78 on a userform with "MultiPage". Am I wrong to think that the current code does not handle MultiPage?
Is it enough to switch the right code section TypeName to "MultiPage" or are more types or API calls needed?
 
Upvote 0
@Gokhan Aycan @Jaafar Tribak
I'm pretty green when it comes to VBA coding, but I'm trying to implement this mouse-scroll feature into a userform that I have and it simply isn't working. My userform is called NameReplace and it consists of 2 labels, a textbox that is filled and uneditable when a cell is double-clicked in a specific column on a specific worksheet and a combobox (named ComboBox1) that is filled with a dynamic range from a column on a worksheet.

The code doesn't crash but scrolling the mouse wheel does not scroll through the combobox which is what I am trying to achieve. I don't know how to troubleshoot the code because I don't fully understand what it's doing behind the scenes. I'm on Excel 365 (64-bit) if that matters.

I look forward to your expertise in resolving this and learning something along the way!
 
Upvote 0
Apologies for my previous post. It appears as if the menu DOES scroll, but only vertically regardless of which way I scroll the mouse wheel. So, if I'm in the middle of the combobox list and scroll the mouse wheel, the list scrolls up towards the top but won't scroll in the other direction.

Simple fix?
 
Upvote 0
Jaafar Tribak said:
Ok. Here is the code edited to hopefully work on any platform including the scenario where the user has Windows 64Bits and Office 2010 or later 32Bits :

Workbook update example

1- Code in a Standard Module:

Code: 
Option Explicit

Public Enum CTRL_KEY_PRESS_STATE
    Released
    Pressed
End Enum

Public Enum WHEEL_ROTATION
    Forward
    Backward
End Enum

Private Type POINTAPI
  X As Long
  Y As Long
End Type

Private Type RECT
    Left As Long
    Top As Long
    Right As Long
    Bottom As Long
End Type

Private Type LongToInteger
    Low As Integer
    High As Integer
End Type

#If VBA7 Then
    Private Type MSG
        hwnd As LongPtr
        message As Long
        wParam As LongPtr
        lParam As LongPtr
        time As Long
        pt As POINTAPI
    End Type
    Private Declare PtrSafe Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As LongPtr
    Private Declare PtrSafe Function GetDeviceCaps Lib "gdi32" (ByVal hdc As LongPtr, ByVal nIndex As Long) As Long
    Private Declare PtrSafe Function GetDC Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Private Declare PtrSafe Function ReleaseDC Lib "user32" (ByVal hwnd As LongPtr, ByVal hdc As LongPtr) As Long
    Private Declare PtrSafe Function ClientToScreen Lib "user32" (ByVal hwnd As LongPtr, lpPoint As POINTAPI) As Long
    Private Declare PtrSafe Function GetParent Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Private Declare PtrSafe Function GetNextWindow Lib "user32" Alias "GetWindow" (ByVal hwnd As LongPtr, ByVal wFlag As Long) As LongPtr
    Private Declare PtrSafe Function GetWindowRect Lib "user32" (ByVal hwnd As LongPtr, lpRect As RECT) As Long
    Private Declare PtrSafe Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As MSG, ByVal hwnd As LongPtr, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long
    Private Declare PtrSafe Function WaitMessage Lib "user32" () As Long
    Private Declare PtrSafe Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As LongPtr, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Private Declare PtrSafe Function GetCursorPos Lib "user32.dll" (lpPoint As POINTAPI) As Long
    Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
    Private Declare PtrSafe Sub ZeroMemory Lib "kernel32" Alias "RtlZeroMemory" (dest As Any, ByVal numBytes As LongPtr)
    Private Declare PtrSafe Function IsBadCodePtr Lib "kernel32" (ByVal lpfn As LongPtr) As Long
    #If Win64 Then
         Private Declare PtrSafe Function AccessibleObjectFromPoint Lib "oleacc" (ByVal arg1 As LongPtr, ppacc As Any, pvarChild As Variant) As Long
         Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal Point As LongPtr) As LongPtr
    #Else
         Private Declare PtrSafe Function AccessibleObjectFromPoint Lib "oleacc" (ByVal lX As Long, ByVal lY As Long, ppacc As IAccessible, pvarChild As Variant) As Long
         Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As LongPtr
    #End If

#Else
    Private Type MSG
        hwnd As Long
        message As Long
        wParam As Long
        lParam As Long
        time As Long
        pt As POINTAPI
    End Type
    Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal nIndex As Long) As Long
    Private Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
    Private Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
    Private Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
    Private Declare Function GetNextWindow Lib "user32" Alias "GetWindow" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
    Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
    Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
    Private Declare Function ClientToScreen Lib "user32" (ByVal hwnd As Long, lpPoint As POINTAPI) As Long
    Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long
    Private Declare Function WaitMessage Lib "user32" () As Long
    Private Declare Function PeekMessage Lib "user32" Alias "PeekMessageA" (lpMsg As MSG, ByVal hwnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long, ByVal wRemoveMsg As Long) As Long
    Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
    Private Declare Function AccessibleObjectFromPoint Lib "Oleacc" (ByVal lX As Long, ByVal lY As Long, ppacc As IAccessible, pvarChild As Variant) As Long
    Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
    Private Declare Sub ZeroMemory Lib "kernel32.dll" Alias "RtlZeroMemory" (Destination As Any, ByVal Length As Long)
    Private Declare Function IsBadCodePtr Lib "kernel32" (ByVal lpfn As Long) As Long
#End If
 
Private Const CHILDID_SELF = &H0&
Private Const S_OK As Long = &H0
Private Const POINTSPERINCH As Long = 72
Private Const LOGPIXELSX As Long = 88
Private Const LOGPIXELSY As Long = 90
Private Const WM_MOUSEWHEEL = &H20A
Private Const PM_REMOVE = &H1
Private Const MK_CONTROL = &H8
Private Const SCROLL_CHANGE = 10

Private arObjCaptions() As Variant
Private arObjPointers() As Variant
Private bCancelProcessing As Boolean

Public Sub HookMouseWheelScroll(ByVal UF As Object)
    Dim WheelRotation As WHEEL_ROTATION
    Dim CtrlKey As CTRL_KEY_PRESS_STATE
    Dim tMsg As MSG
    Dim tCurPos As POINTAPI
    Dim oIA As IAccessible
    Dim oObjUnderMouse As Object
    Dim oPage As Object
    Dim oCtrl As Object
    Dim vKid  As Variant
    Dim i As Long
    Dim j As Long
    Dim lResult As Long
    Dim bCancel As Boolean
    Static k As Long
    #If VBA7 Then
        Dim Ptr As LongPtr
    #Else
        Dim Ptr As Long
    #End If
   
    bCancelProcessing = False
    k = 0
    UF.Caption = UF.Caption & Chr(10)
    j = 0
    Erase arObjCaptions
    Erase arObjPointers
    For Each oCtrl In UF.Controls
        If TypeName(oCtrl) = "MultiPage" Then
            For Each oPage In oCtrl.Pages
                i = i + 1
                oPage.Caption = oPage.Caption & String(i, Chr(10))
                ReDim Preserve arObjCaptions(j)
                ReDim Preserve arObjPointers(j)
                arObjCaptions(j) = oPage.Caption & Chr(10)
                arObjPointers(j) = ObjPtr(oPage)
                j = j + 1
            Next
        End If
    Next
    Do While Not bCancelProcessing
        DoEvents
        GetCursorPos tCurPos
        #If Win64 Then
            CopyMemory Ptr, tCurPos, LenB(tCurPos)
            lResult = AccessibleObjectFromPoint(Ptr, oIA, vKid)
        #Else
            lResult = AccessibleObjectFromPoint(tCurPos.X, tCurPos.Y, oIA, vKid)
        #End If
        If lResult = S_OK Then
            On Error Resume Next
            Set oObjUnderMouse = objUnderMouse(UF, oIA, tCurPos)
            If Not oObjUnderMouse Is Nothing Then
                WaitMessage
                If PeekMessage(tMsg, 0, WM_MOUSEWHEEL, WM_MOUSEWHEEL, PM_REMOVE) Then
                    CtrlKey = IIf(LoWord(CLng(tMsg.wParam)) = MK_CONTROL, Pressed, Released)
                    WheelRotation = IIf(tMsg.wParam > 0, Forward, Backward)
                    Call UF.OnScrollEvent(oObjUnderMouse, WheelRotation, CtrlKey, tMsg.pt.X, tMsg.pt.Y, bCancel)
                    If Not bCancel Then
                        If TypeName(oObjUnderMouse) = "TextBox" Then
                            With oObjUnderMouse
                                .SetFocus
                                If k = 0 Then
                                    .SelStart = 0
                                Else
                                    .SelStart = IIf(.SelStart = .LineCount, 0, .SelStart)
                                End If
                                If WheelRotation = Forward Then
                                    .CurLine = .CurLine - 1
                                Else
                                    .CurLine = IIf(.CurLine = .LineCount - 1, .CurLine, .CurLine + 1)
                                End If
                            End With
                            k = k + 1
                        End If
                        If TypeName(oObjUnderMouse) = "ScrollBar" Then
                            With oObjUnderMouse
                                If WheelRotation = Forward Then
                                    .Value = IIf(.Value - oObjUnderMouse.SmallChange > .Min, .Value - oObjUnderMouse.SmallChange, .Min)
                                Else
                                    .Value = IIf(.Value + oObjUnderMouse.SmallChange < .Max, .Value + oObjUnderMouse.SmallChange, .Max)
                                End If
                            End With
                        End If
                        If TypeName(oObjUnderMouse) = "ListBox" Or TypeName(oObjUnderMouse) = "ComboBox" Then
                            With oObjUnderMouse
                                If CtrlKey = Released Then
                                    If WheelRotation = Forward Then
                                    .TopIndex = .TopIndex - 1
                                    Else
                                    .TopIndex = .TopIndex + 1
                                    End If
                                Else
                                    .SetFocus
                                    If WheelRotation = Forward Then
                                        SendKeys "{LEFT}", True
                                        DoEvents
                                        SendKeys "{RIGHT}", True
                                    Else
                                        SendKeys "{RIGHT}", True
                                        DoEvents
                                        SendKeys "{RIGHT}", True
                                    End If
                                End If
                            End With
                        End If
                        If TypeName(oObjUnderMouse) = UF.Name Or TypeName(oObjUnderMouse) = "Frame" Or TypeName(oObjUnderMouse) = "Page" Then
                            With oObjUnderMouse
                                If CtrlKey = Released Then
                                    If WheelRotation = Forward Then
                                        .ScrollTop = Application.Max(0, .ScrollTop - 5)
                                    Else
                                        .ScrollTop = Application.Min(.ScrollHeight - .InsideHeight, .ScrollTop + SCROLL_CHANGE)
                                    End If
                                Else
                                    If WheelRotation = Forward Then
                                        .ScrollLeft = Application.Max(0, .ScrollLeft - 5)
                                    Else
                                        .ScrollLeft = Application.Min(.ScrollWidth - .InsideWidth, .ScrollLeft + SCROLL_CHANGE)
                                    End If
                                End If
                            End With
                        End If
                    End If
                    DoEvents
                End If
            End If
        End If
    Loop
End Sub


Public Sub RemoveMouseWheelHook()
    bCancelProcessing = True
End Sub


'Private Routines ..
'-------------------

Private Function objUnderMouse(ByVal UF As Object, ByVal oAcc As IAccessible, MouseLoc As POINTAPI) As Object
    #If VBA7 Then
        Dim lngPtr As LongPtr
        Dim lObjPtr As LongPtr
        Dim lCtrlPtr As LongPtr
        Dim hwndForm As LongPtr
        Dim hwndFromPoint As LongPtr
    #Else
        Dim lObjPtr As Long
        Dim lCtrlPtr As Long
        Dim hwndForm As Long
        Dim hwndFromPoint As Long
    #End If
    Dim arCtrlsPosition() As Variant
    Dim arCtrlsPointers() As Variant
    Dim tPt As POINTAPI
    Dim tRect As RECT
    Dim oObj As Object
    Dim oCtrl As Control
    Dim sBuffer As String
    Dim lCtrlLeft As Long
    Dim lCtrlTop As Long
    Dim lPos1 As Long
    Dim lPos2 As Long
    Dim lPos3 As Long
    Dim lRet As Long
    Dim i As Long

    On Error Resume Next
    hwndForm = FindWindow(vbNullString, UF.Caption)
   
    For Each oCtrl In UF.Controls
        ReDim Preserve arCtrlsPosition(i + 1)
        ReDim Preserve arCtrlsPointers(i + 1)
        tPt = GetRealCtrlScreenLocation(oCtrl, hwndForm, UF)
        arCtrlsPosition(i) = tPt.X & tPt.Y
        arCtrlsPointers(i) = ObjPtr(oCtrl)
        arCtrlsPosition(i + 1) = tPt.X - 2 & tPt.Y - 1
        arCtrlsPointers(i + 1) = ObjPtr(oCtrl)
        i = i + 2
    Next
   
    lPos1 = Application.Match(oAcc.accName(CHILDID_SELF) & Chr(10), arObjCaptions, 0)
    lObjPtr = Application.Index(arObjPointers, 1, lPos1)
    Call oAcc.accLocation(lCtrlLeft, lCtrlTop, 0, 0, CHILDID_SELF)
    lPos2 = Application.Match(lCtrlLeft & lCtrlTop, arCtrlsPosition, 0)
    lCtrlPtr = Application.Index(arCtrlsPointers, 1, lPos2)
   
    #If VBA7 And Win64 Then
        CopyMemory lngPtr, MouseLoc, LenB(MouseLoc)
        hwndFromPoint = WindowFromPoint(lngPtr)
    #Else
        hwndFromPoint = WindowFromPoint(MouseLoc.X, MouseLoc.Y)
    #End If
   
    sBuffer = Space(256)
    lRet = GetClassName(GetParent(hwndFromPoint), sBuffer, 256)
    lPos3 = InStr(1, Left(sBuffer, lRet), "MdcPopup")
   
    Select Case True
        Case lPos3 <> 0
            Set objUnderMouse = GetActiveComboBox(UF)
            Exit Function
        Case oAcc.accName(CHILDID_SELF) = UF.Caption
            Set oObj = UF
        Case lObjPtr = 0
            If IsBadCodePtr(lCtrlPtr) = 0 Then
                CopyMemory oObj, lCtrlPtr, 4
            End If
        Case lObjPtr <> 0
            If IsBadCodePtr(lObjPtr) = 0 Then
                CopyMemory oObj, lObjPtr, 4
            End If
    End Select
   
    Set objUnderMouse = oObj
    If Not oObj Is Nothing Then
        ZeroMemory oObj, 4
    End If
End Function

#If VBA7 Then
    Private Function GetRealCtrlScreenLocation(ByVal Ctl As Object, ByVal hwnd As LongPtr, ByVal UF As Object) As POINTAPI
#Else
    Private Function GetRealCtrlScreenLocation(ByVal Ctl As Object, ByVal hwnd As Long, ByVal UF As Object) As POINTAPI
#End If
    Dim tRect As RECT
    Dim tTopLeft As POINTAPI
    Dim oMultiPage As Control
    Dim oTempObj As Control

    On Error Resume Next
    Set oTempObj = Ctl.Parent
    With tTopLeft
        Select Case True
             Case oTempObj Is Nothing
                .X = PTtoPX(Ctl.Left - UF.ScrollLeft * UF.Zoom / 100, False)
                .Y = PTtoPX(Ctl.Top - UF.ScrollTop * UF.Zoom / 100, True)
                ClientToScreen hwnd, tTopLeft
             Case TypeName(oTempObj) = "Frame"
                GetWindowRect oTempObj.[_GethWnd], tRect
                .X = PTtoPX(Ctl.Left - oTempObj.ScrollLeft * (oTempObj.Zoom / 100), False) + tRect.Left + 2
                .Y = PTtoPX(Ctl.Top - oTempObj.ScrollTop * (oTempObj.Zoom / 100), True) + tRect.Top + 8
            Case TypeName(oTempObj) = "Page"
                Set oMultiPage = oTempObj.Parent
                GetWindowRect GetNextWindow(oMultiPage.[_GethWnd], 5), tRect
                .X = PTtoPX(Ctl.Left - oTempObj.ScrollLeft * (oTempObj.Zoom / 100), False) + tRect.Left
                .Y = PTtoPX(Ctl.Top - oTempObj.ScrollTop * (oTempObj.Zoom / 100), True) + tRect.Top
                Set oMultiPage = Nothing
            End Select
        End With
    GetRealCtrlScreenLocation = tTopLeft
    Set oTempObj = Nothing
End Function

Private Function GetActiveComboBox(ByVal Ctl As Object) As Control
    Dim oCtl As Object
    Dim lCur As Long
    On Error Resume Next
    For Each oCtl In Ctl.Controls
        Err.Clear
        lCur = oCtl.CurX
        If Err.Number = 0 And TypeName(oCtl) = "ComboBox" Then Set GetActiveComboBox = oCtl: Exit Function
    Next
End Function

Private Function LoWord(ByVal Word As Long) As Integer
    Dim X As LongToInteger
    CopyMemory X, Word, LenB(X)
    LoWord = X.Low
End Function

Private Function ScreenDPI(ByVal bVert As Boolean) As Long
    Static lDPI(1), lDC
    If lDPI(0) = 0 Then
        lDC = GetDC(0)
        lDPI(0) = GetDeviceCaps(lDC, LOGPIXELSX)
        lDPI(1) = GetDeviceCaps(lDC, LOGPIXELSY)
        lDC = ReleaseDC(0, lDC)
    End If
    ScreenDPI = lDPI(Abs(bVert))
End Function

Private Function PTtoPX(ByVal Points As Single, ByVal bVert As Boolean) As Long
    PTtoPX = Points * ScreenDPI(bVert) / POINTSPERINCH
End Function


2- Code usage example in the UserForm module:
Code: 
Option Explicit

Private Sub UserForm_Activate()
    Dim i As Long
   
    'Populate the controls
    For i = 0 To 100
        With ListBox1
            .ColumnCount = 4
            .ColumnWidths = "100;100;100;100"
            .AddItem "COLUMN1"
            .List(i, 1) = "COLUMN2"
            .List(i, 2) = "COLUMN3"
            .List(i, 3) = "COLUMN4"
        End With
        ListBox2.AddItem i
        ComboBox1.AddItem i
        ComboBox2.AddItem i
        ComboBox3.AddItem i
        ComboBox4.AddItem i
        ComboBox5.AddItem i
        ComboBox6.AddItem i
        ComboBox7.AddItem i
        ComboBox8.AddItem i
        ComboBox9.AddItem i
    Next i
    With TextBox1
        .Text = .Text & String(300, "A")
        .Text = .Text & String(300, "I")
        .Text = .Text & String(300, "X")
    End With
    Label1.Caption = "Object :"
    Label2.Caption = "Wheel Rotation :"
    Label3.Caption = "Scroll Direction :"
    Label4.Caption = "Cursor X :"
    Label5.Caption = "Cursor Y :"
    Label6.Caption = "Scroll Cancelled :"
   
    'Hook MouseWheel Scroll of Form and of all its controls
    Call HookMouseWheelScroll(Me)

End Sub

Private Sub UserForm_QueryClose(Cancel As Integer, CloseMode As Integer)
    Call RemoveMouseWheelHook
End Sub

Private Sub CommandButton1_Click()
    Unload Me
End Sub

'--------------------
'Public Generic event
'--------------------

[B][COLOR=#008000]'Set the Cancel Arg to TRUE to disable scrolling[/COLOR][/B]

Public Sub OnScrollEvent(ByVal Obj As Object, ByVal WheelRotation As WHEEL_ROTATION, _
ByVal CtrlKey As CTRL_KEY_PRESS_STATE, ByVal X As Long, ByVal Y As Long, Cancel As Boolean)

    Dim sObjName As String, sWheelRot As String, sCtrlKey As String
    Dim sCurX As String, sCurY As String, sCancelScrol As String
   
    sObjName = "Object :  (" & Obj.Name & ")"
    sWheelRot = "Wheel Rotation :  (" & IIf(WheelRotation = Forward, "Forward", "Backward") & ")"
    sCtrlKey = "Scroll Direction :  (" & IIf(CtrlKey = Released, "Vert", "Horiz") & ")"
    sCurX = "Cursor X :  (" & X & ")"
    sCurY = "Cursor Y :  (" & Y & ")"
    sCancelScrol = "Scroll Cancelled :  (" & Cancel & ")"
   
    Label1.Caption = sObjName
    Label2.Caption = sWheelRot
    Label3.Caption = sCtrlKey
    Label4.Caption = sCurX
    Label5.Caption = sCurY
    Label6.Caption = sCancelScrol
End Sub


Note that the user can scroll horizontally by holding the Ctrl Key down.

Also, the code is designed in such a way that the user can flexibly set the Cancel argument to TRUE of the OnScrollEvent routine (routine located in the UserForm Module) to disable scrolling.

I hope the code now works accross different platforms without issues.
Click to expand...
I know this is almost 1o years old but I am still trying to get this working. When I load the code as is I get the following error when I try to compile. AMbiguous name detected CTRL_KEY_PRESS_STATE

This code is way over my head so I dot even know where to start. I am on Windows 10 64Bit and Office 365

Any assistance would be greatly appreciated
 
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