ComboBox Scroll with Mouse wheel

D

DarkGlobus1OO

New Member
Joined
Sep 28, 2017
Messages
11
i tried to work with peter Peter Thornton (Excel MVP 2008-13) code which works amazing for userform Comboxes and listboxes but im a vba noobie and i cant seem to understand how to make this code work for a regular ComboBox on a worksheet

Module Code:
Code: 
'Enables mouse wheel scrolling in controls
Option Explicit


#If Win64 Then
    Private Type POINTAPI
       XY As LongLong
    End Type
#Else
    Private Type POINTAPI
           X As Long
           Y As Long
    End Type
#End If


Private Type MOUSEHOOKSTRUCT
    Pt As POINTAPI
    hWnd As Long
    wHitTestCode As Long
    dwExtraInfo As Long
End Type


#If  VBA7 Then
    Private Declare PtrSafe Function FindWindow Lib "user32" _
                                            Alias "FindWindowA" ( _
                                                            ByVal lpClassName As String, _
                                                            ByVal lpWindowName As String) As Long ' not sure if this should be LongPtr
    #If  Win64 Then
        Private Declare PtrSafe Function GetWindowLongPtr Lib "user32" _
                                            Alias "GetWindowLongPtrA" ( _
                                                            ByVal hWnd As LongPtr, _
                                                            ByVal nIndex As Long) As LongPtr
    #Else
        Private Declare PtrSafe Function GetWindowLong Lib "user32" _
                                            Alias "GetWindowLongA" ( _
                                                            ByVal hWnd As LongPtr, _
                                                            ByVal nIndex As Long) As LongPtr
    #End  If
    Private Declare PtrSafe Function SetWindowsHookEx Lib "user32" _
                                            Alias "SetWindowsHookExA" ( _
                                                            ByVal idHook As Long, _
                                                            ByVal lpfn As LongPtr, _
                                                            ByVal hmod As LongPtr, _
                                                            ByVal dwThreadId As Long) As LongPtr
    Private Declare PtrSafe Function CallNextHookEx Lib "user32" ( _
                                                            ByVal hHook As LongPtr, _
                                                            ByVal nCode As Long, _
                                                            ByVal wParam As LongPtr, _
                                                           lParam As Any) As LongPtr
    Private Declare PtrSafe Function UnhookWindowsHookEx Lib "user32" ( _
                                                            ByVal hHook As LongPtr) As LongPtr ' MAYBE Long
    'Private Declare PtrSafe Function PostMessage Lib "user32.dll" _
    '                                         Alias "PostMessageA" ( _
    '                                                         ByVal hwnd As LongPtr, _
    '                                                         ByVal wMsg As Long, _
    '                                                         ByVal wParam As LongPtr, _
    '                                                         ByVal lParam As LongPtr) As LongPtr   ' MAYBE Long
    #If  Win64 Then
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" ( _
                                                            ByVal Point As LongLong) As LongPtr    '
    #Else
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" ( _
                                                            ByVal xPoint As Long, _
                                                            ByVal yPoint As Long) As LongPtr    '
    #End  If
    Private Declare PtrSafe Function GetCursorPos Lib "user32" ( _
                                                            ByRef lpPoint As POINTAPI) As LongPtr   'MAYBE Long
#Else
    Private Declare Function FindWindow Lib "user32" _
                                            Alias "FindWindowA" ( _
                                                            ByVal lpClassName As String, _
                                                            ByVal lpWindowName As String) As Long
    Private Declare Function GetWindowLong Lib "user32.dll" _
                                            Alias "GetWindowLongA" ( _
                                                            ByVal hWnd As Long, _
                                                            ByVal nIndex As Long) As Long
    Private Declare Function SetWindowsHookEx Lib "user32" _
                                            Alias "SetWindowsHookExA" ( _
                                                            ByVal idHook As Long, _
                                                            ByVal lpfn As Long, _
                                                            ByVal hmod As Long, _
                                                            ByVal dwThreadId As Long) As Long
    Private Declare Function CallNextHookEx Lib "user32" ( _
                                                            ByVal hHook As Long, _
                                                            ByVal nCode As Long, _
                                                            ByVal wParam As Long, _
                                                           lParam As Any) As Long
    Private Declare Function UnhookWindowsHookEx Lib "user32" ( _
                                                            ByVal hHook As Long) As Long
    'Private Declare Function PostMessage Lib "user32.dll" _
    '                                         Alias "PostMessageA" ( _
    '                                                         ByVal hwnd As Long, _
    '                                                         ByVal wMsg As Long, _
    '                                                         ByVal wParam As Long, _
    '                                                         ByVal lParam As Long) As Long
    Private Declare Function WindowFromPoint Lib "user32" ( _
                                                            ByVal xPoint As Long, _
                                                            ByVal yPoint As Long) As Long
    Private Declare Function GetCursorPos Lib "user32.dll" ( _
                                                            ByRef lpPoint As POINTAPI) As Long
#End  If


Private Const WH_MOUSE_LL As Long = 14
Private Const WM_MOUSEWHEEL As Long = &H20A
Private Const HC_ACTION As Long = 0
Private Const GWL_HINSTANCE As Long = (-6)
'Private Const WM_KEYDOWN As Long = &H100
'Private Const WM_KEYUP As Long = &H101
'Private Const VK_UP As Long = &H26
'Private Const VK_DOWN As Long = &H28
'Private Const WM_LBUTTONDOWN As Long = &H201
Dim n As Long
Private mCtl As Object
Private mbHook As Boolean
#If  VBA7 Then
    Private mLngMouseHook As LongPtr
    Private mListBoxHwnd As LongPtr
#Else
    Private mLngMouseHook As Long
    Private mListBoxHwnd As Long
#End  If
     
Sub HookListBoxScroll(frm As Object, ctl As Object)
    Dim tPT As POINTAPI
    #If VBA7 Then
        Dim lngAppInst As LongPtr
        Dim hwndUnderCursor As LongPtr
    #Else
        Dim lngAppInst As Long
        Dim hwndUnderCursor As Long
    #End  If
    GetCursorPos tPT
    #If  Win64 Then
        hwndUnderCursor = WindowFromPoint(tPT.XY)
    #Else
        hwndUnderCursor = WindowFromPoint(tPT.X, tPT.Y)
    #End  If
    If TypeOf ctl Is UserForm Then
        If Not frm Is ctl Then
               ctl.SetFocus
        End If
    Else
        If Not frm.ActiveControl Is ctl Then
             ctl.SetFocus
        End If
    End If
    If mListBoxHwnd <> hwndUnderCursor Then
        UnhookListBoxScroll
        Set mCtl = ctl
        mListBoxHwnd = hwndUnderCursor
        #If  Win64 Then
            lngAppInst = GetWindowLongPtr(mListBoxHwnd, GWL_HINSTANCE)
        #Else
            lngAppInst = GetWindowLong(mListBoxHwnd, GWL_HINSTANCE)
        #End  If
        ' PostMessage mListBoxHwnd, WM_LBUTTONDOWN, 0&, 0&
        If Not mbHook Then
            mLngMouseHook = SetWindowsHookEx( _
                                            WH_MOUSE_LL, AddressOf MouseProc, lngAppInst, 0)
            mbHook = mLngMouseHook <> 0
        End If
    End If
End Sub


Sub UnhookListBoxScroll()
    If mbHook Then
        Set mCtl = Nothing
        UnhookWindowsHookEx mLngMouseHook
        mLngMouseHook = 0
        mListBoxHwnd = 0
        mbHook = False
    End If
End Sub
#If  VBA7 Then
    Private Function MouseProc( _
                            ByVal nCode As Long, ByVal wParam As Long, _
                            ByRef lParam As MOUSEHOOKSTRUCT) As LongPtr
        Dim idx As Long
        On Error GoTo errH
        If (nCode = HC_ACTION) Then
            #If  Win64 Then
                If WindowFromPoint(lParam.Pt.XY) = mListBoxHwnd Then
                    If wParam = WM_MOUSEWHEEL Then
                        MouseProc = True
'                        If lParam.hWnd > 0 Then
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                        Else
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                        End If
'                        postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                        If TypeOf mCtl Is Frame Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        ElseIf TypeOf mCtl Is UserForm Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        Else
                             If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                             idx = idx + mCtl.ListIndex
                             If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                        End If
                    Exit Function
                    End If
                Else
                    UnhookListBoxScroll
                End If
            #Else
                If WindowFromPoint(lParam.Pt.X, lParam.Pt.Y) = mListBoxHwnd Then
                    If wParam = WM_MOUSEWHEEL Then
                        MouseProc = True
'                        If lParam.hWnd > 0 Then
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                        Else
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                        End If
'                        postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                        If TypeOf mCtl Is Frame Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        ElseIf TypeOf mCtl Is UserForm Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        Else
                             If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                             idx = idx + mCtl.ListIndex
                             If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                        End If
                        Exit Function
                    End If
                Else
                    UnhookListBoxScroll
                End If
            #End If
        End If
        MouseProc = CallNextHookEx( _
                                mLngMouseHook, nCode, wParam, ByVal lParam)
        Exit Function
errH:
        UnhookListBoxScroll
    End Function
#Else
    Private Function MouseProc( _
                            ByVal nCode As Long, ByVal wParam As Long, _
                            ByRef lParam As MOUSEHOOKSTRUCT) As Long
        Dim idx As Long
        On Error GoTo errH
        If (nCode = HC_ACTION) Then
            If WindowFromPoint(lParam.Pt.X, lParam.Pt.Y) = mListBoxHwnd Then
                If wParam = WM_MOUSEWHEEL Then
                    MouseProc = True
'                    If lParam.hWnd > 0 Then
'                    postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                    Else
'                    postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                    End If
'                    postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                    
                    If TypeOf mCtl Is Frame Then
                        If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                        idx = idx + mCtl.ScrollTop
                        If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                            mCtl.ScrollTop = idx
                        End If
                    ElseIf TypeOf mCtl Is UserForm Then
                        If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                        idx = idx + mCtl.ScrollTop
                        If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                            mCtl.ScrollTop = idx
                        End If
                    Else
                         If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                         idx = idx + mCtl.ListIndex
                         If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                    End If
                    Exit Function
                End If
            Else
                UnhookListBoxScroll
            End If
        End If
        MouseProc = CallNextHookEx( _
        mLngMouseHook, nCode, wParam, ByVal lParam)
        Exit Function
errH:
        UnhookListBoxScroll
    End Function
#End  If


hope someone here can help me i have been scratching my head around this problem for days!
:confused::confused::confused::confused:
 
Last edited by a moderator:
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DarkGlobus1OO said:
i tried to work with peter Peter Thornton (Excel MVP 2008-13) code which works amazing for userform Comboxes and listboxes but im a vba noobie and i cant seem to understand how to make this code work for a regular ComboBox on a worksheet

Module Code:
Rich (BB code): 
'Enables mouse wheel scrolling in controls
Option Explicit


#If  Win64 Then
    Private Type POINTAPI
       XY As LongLong
    End Type
#Else 
    Private Type POINTAPI
           X As Long
           Y As Long
    End Type
#End  If


Private Type MOUSEHOOKSTRUCT
    Pt As POINTAPI
    hWnd As Long
    wHitTestCode As Long
    dwExtraInfo As Long
End Type


#If   VBA7 Then
    Private Declare PtrSafe Function FindWindow Lib "user32" _
                                            Alias "FindWindowA" ( _
                                                            ByVal lpClassName As String, _
                                                            ByVal lpWindowName As String) As Long ' not sure if this should be LongPtr
    #If   Win64 Then
        Private Declare PtrSafe Function GetWindowLongPtr Lib "user32" _
                                            Alias "GetWindowLongPtrA" ( _
                                                            ByVal hWnd As LongPtr, _
                                                            ByVal nIndex As Long) As LongPtr
    #Else 
        Private Declare PtrSafe Function GetWindowLong Lib "user32" _
                                            Alias "GetWindowLongA" ( _
                                                            ByVal hWnd As LongPtr, _
                                                            ByVal nIndex As Long) As LongPtr
    #End   If
    Private Declare PtrSafe Function SetWindowsHookEx Lib "user32" _
                                            Alias "SetWindowsHookExA" ( _
                                                            ByVal idHook As Long, _
                                                            ByVal lpfn As LongPtr, _
                                                            ByVal hmod As LongPtr, _
                                                            ByVal dwThreadId As Long) As LongPtr
    Private Declare PtrSafe Function CallNextHookEx Lib "user32" ( _
                                                            ByVal hHook As LongPtr, _
                                                            ByVal nCode As Long, _
                                                            ByVal wParam As LongPtr, _
                                                           lParam As Any) As LongPtr
    Private Declare PtrSafe Function UnhookWindowsHookEx Lib "user32" ( _
                                                            ByVal hHook As LongPtr) As LongPtr ' MAYBE Long
    'Private Declare PtrSafe Function PostMessage Lib "user32.dll" _
    '                                         Alias "PostMessageA" ( _
    '                                                         ByVal hwnd As LongPtr, _
    '                                                         ByVal wMsg As Long, _
    '                                                         ByVal wParam As LongPtr, _
    '                                                         ByVal lParam As LongPtr) As LongPtr   ' MAYBE Long
    #If   Win64 Then
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" ( _
                                                            ByVal Point As LongLong) As LongPtr    '
    #Else 
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" ( _
                                                            ByVal xPoint As Long, _
                                                            ByVal yPoint As Long) As LongPtr    '
    #End   If
    Private Declare PtrSafe Function GetCursorPos Lib "user32" ( _
                                                            ByRef lpPoint As POINTAPI) As LongPtr   'MAYBE Long
#Else 
    Private Declare Function FindWindow Lib "user32" _
                                            Alias "FindWindowA" ( _
                                                            ByVal lpClassName As String, _
                                                            ByVal lpWindowName As String) As Long
    Private Declare Function GetWindowLong Lib "user32.dll" _
                                            Alias "GetWindowLongA" ( _
                                                            ByVal hWnd As Long, _
                                                            ByVal nIndex As Long) As Long
    Private Declare Function SetWindowsHookEx Lib "user32" _
                                            Alias "SetWindowsHookExA" ( _
                                                            ByVal idHook As Long, _
                                                            ByVal lpfn As Long, _
                                                            ByVal hmod As Long, _
                                                            ByVal dwThreadId As Long) As Long
    Private Declare Function CallNextHookEx Lib "user32" ( _
                                                            ByVal hHook As Long, _
                                                            ByVal nCode As Long, _
                                                            ByVal wParam As Long, _
                                                           lParam As Any) As Long
    Private Declare Function UnhookWindowsHookEx Lib "user32" ( _
                                                            ByVal hHook As Long) As Long
    'Private Declare Function PostMessage Lib "user32.dll" _
    '                                         Alias "PostMessageA" ( _
    '                                                         ByVal hwnd As Long, _
    '                                                         ByVal wMsg As Long, _
    '                                                         ByVal wParam As Long, _
    '                                                         ByVal lParam As Long) As Long
    Private Declare Function WindowFromPoint Lib "user32" ( _
                                                            ByVal xPoint As Long, _
                                                            ByVal yPoint As Long) As Long
    Private Declare Function GetCursorPos Lib "user32.dll" ( _
                                                            ByRef lpPoint As POINTAPI) As Long
#End   If


Private Const WH_MOUSE_LL As Long = 14
Private Const WM_MOUSEWHEEL As Long = &H20A
Private Const HC_ACTION As Long = 0
Private Const GWL_HINSTANCE As Long = (-6)
'Private Const WM_KEYDOWN As Long = &H100
'Private Const WM_KEYUP As Long = &H101
'Private Const VK_UP As Long = &H26
'Private Const VK_DOWN As Long = &H28
'Private Const WM_LBUTTONDOWN As Long = &H201
Dim n As Long
Private mCtl As Object
Private mbHook As Boolean
#If   VBA7 Then
    Private mLngMouseHook As LongPtr
    Private mListBoxHwnd As LongPtr
#Else 
    Private mLngMouseHook As Long
    Private mListBoxHwnd As Long
#End   If
     
Sub HookListBoxScroll(frm As Object, ctl As Object)
    Dim tPT As POINTAPI
    #If  VBA7 Then
        Dim lngAppInst As LongPtr
        Dim hwndUnderCursor As LongPtr
    #Else 
        Dim lngAppInst As Long
        Dim hwndUnderCursor As Long
    #End   If
    GetCursorPos tPT
    #If   Win64 Then
        hwndUnderCursor = WindowFromPoint(tPT.XY)
    #Else 
        hwndUnderCursor = WindowFromPoint(tPT.X, tPT.Y)
    #End   If
    If TypeOf ctl Is UserForm Then
        If Not frm Is ctl Then
               ctl.SetFocus
        End If
    Else
        If Not frm.ActiveControl Is ctl Then
             ctl.SetFocus
        End If
    End If
    If mListBoxHwnd <> hwndUnderCursor Then
        UnhookListBoxScroll
        Set mCtl = ctl
        mListBoxHwnd = hwndUnderCursor
        #If   Win64 Then
            lngAppInst = GetWindowLongPtr(mListBoxHwnd, GWL_HINSTANCE)
        #Else 
            lngAppInst = GetWindowLong(mListBoxHwnd, GWL_HINSTANCE)
        #End   If
        ' PostMessage mListBoxHwnd, WM_LBUTTONDOWN, 0&, 0&
        If Not mbHook Then
            mLngMouseHook = SetWindowsHookEx( _
                                            WH_MOUSE_LL, AddressOf MouseProc, lngAppInst, 0)
            mbHook = mLngMouseHook <> 0
        End If
    End If
End Sub


Sub UnhookListBoxScroll()
    If mbHook Then
        Set mCtl = Nothing
        UnhookWindowsHookEx mLngMouseHook
        mLngMouseHook = 0
        mListBoxHwnd = 0
        mbHook = False
    End If
End Sub
#If   VBA7 Then
    Private Function MouseProc( _
                            ByVal nCode As Long, ByVal wParam As Long, _
                            ByRef lParam As MOUSEHOOKSTRUCT) As LongPtr
        Dim idx As Long
        On Error GoTo errH
        If (nCode = HC_ACTION) Then
            #If   Win64 Then
                If WindowFromPoint(lParam.Pt.XY) = mListBoxHwnd Then
                    If wParam = WM_MOUSEWHEEL Then
                        MouseProc = True
'                        If lParam.hWnd > 0 Then
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                        Else
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                        End If
'                        postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                        If TypeOf mCtl Is Frame Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        ElseIf TypeOf mCtl Is UserForm Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        Else
                             If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                             idx = idx + mCtl.ListIndex
                             If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                        End If
                    Exit Function
                    End If
                Else
                    UnhookListBoxScroll
                End If
            #Else 
                If WindowFromPoint(lParam.Pt.X, lParam.Pt.Y) = mListBoxHwnd Then
                    If wParam = WM_MOUSEWHEEL Then
                        MouseProc = True
'                        If lParam.hWnd > 0 Then
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                        Else
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                        End If
'                        postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                        If TypeOf mCtl Is Frame Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        ElseIf TypeOf mCtl Is UserForm Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        Else
                             If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                             idx = idx + mCtl.ListIndex
                             If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                        End If
                        Exit Function
                    End If
                Else
                    UnhookListBoxScroll
                End If
            #End  If
        End If
        MouseProc = CallNextHookEx( _
                                mLngMouseHook, nCode, wParam, ByVal lParam)
        Exit Function
errH:
        UnhookListBoxScroll
    End Function
#Else 
    Private Function MouseProc( _
                            ByVal nCode As Long, ByVal wParam As Long, _
                            ByRef lParam As MOUSEHOOKSTRUCT) As Long
        Dim idx As Long
        On Error GoTo errH
        If (nCode = HC_ACTION) Then
            If WindowFromPoint(lParam.Pt.X, lParam.Pt.Y) = mListBoxHwnd Then
                If wParam = WM_MOUSEWHEEL Then
                    MouseProc = True
'                    If lParam.hWnd > 0 Then
'                    postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                    Else
'                    postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                    End If
'                    postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                    
                    If TypeOf mCtl Is Frame Then
                        If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                        idx = idx + mCtl.ScrollTop
                        If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                            mCtl.ScrollTop = idx
                        End If
                    ElseIf TypeOf mCtl Is UserForm Then
                        If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                        idx = idx + mCtl.ScrollTop
                        If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                            mCtl.ScrollTop = idx
                        End If
                    Else
                         If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                         idx = idx + mCtl.ListIndex
                         If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                    End If
                    Exit Function
                End If
            Else
                UnhookListBoxScroll
            End If
        End If
        MouseProc = CallNextHookEx( _
        mLngMouseHook, nCode, wParam, ByVal lParam)
        Exit Function
errH:
        UnhookListBoxScroll
    End Function
#End   If


hope someone here can help me i have been scratching my head around this problem for days!
:confused::confused::confused::confused:
Click to expand...
I keep getting an error message : invalid use of AddressOf operator. Do you experience the same? And why did you comment some of the lines out? Let me know because I have been looking for a similar code for long. Thanks
Kelly
Code: 
  If Not mbHook Then
            mLngMouseHook = SetWindowsHookEx( _
                                            WH_MOUSE_LL, AddressOf MouseProc, lngAppInst, 0)
            mbHook = mLngMouseHook <> 0
        End If
 
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Ok here is a much better approach slightly more involved code-wise but doesn't interfere with the combobox change event because this new code doesn't change the ListIndex property. Instead, this code posts a button click to the combobox vertical scrollbar.

Also,with this new code, the highlighted combobox item follows the mouse pointer which makes it nicer and much more intuitive for the user.

Workbook Demo.

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

Type POINTAPI
    x As Long
    y As Long
End Type

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

Type MSLLHOOKSTRUCT
    pt As POINTAPI
    mouseData As Long
    flags As Long
    time As Long
    dwExtraInfo As Long
End Type

#If  VBA7 Then
    #If  Win64 Then
        Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal Point As LongPtr) As LongPtr
    #Else
        Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As LongPtr
    #End  If
    Declare PtrSafe Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As LongPtr, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Declare PtrSafe Function GetParent Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Declare PtrSafe Function GetActiveWindow Lib "user32" () As LongPtr
    Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
    Declare PtrSafe Function GetCursorPos Lib "user32" (ByRef lpPoint As POINTAPI) As LongPtr
    Declare PtrSafe Function SetFocus Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Declare PtrSafe Function IsWindow Lib "user32" (ByVal hwnd As LongPtr) As Long
    Declare PtrSafe Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As LongPtr, ByVal hmod As LongPtr, ByVal dwThreadId As Long) As LongPtr
    Declare PtrSafe Function CallNextHookEx Lib "user32" (ByVal hHook As LongPtr, ByVal nCode As Long, ByVal wParam As LongPtr, lParam As Any) As LongPtr
    Declare PtrSafe Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As LongPtr) As LongPtr
    Declare PtrSafe Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As LongPtr, ByVal wMsg As Long, ByVal wParam As LongPtr, ByVal lParam As LongPtr) As Long
    Declare PtrSafe Function GetClientRect Lib "user32" (ByVal hwnd As LongPtr, lpRect As RECT) As Long
    Declare PtrSafe Sub MoveMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal Destination As Any, ByVal Source As Any, ByVal Length As LongPtr)
    Declare PtrSafe Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
    Dim hwnd As LongPtr, lMouseHook As LongPtr
#Else
    Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
    Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
    Declare Function GetActiveWindow Lib "user32" () As Long
    Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
    Declare Function GetCursorPos Lib "user32" (ByRef lpPoint As POINTAPI) As Long
    Declare Function SetFocus Lib "user32" (ByVal hwnd As Long) As Long
    Declare Function IsWindow Lib "user32" (ByVal hwnd As Long) As Long
    Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hmod As Long, ByVal dwThreadId As Long) As Long
    Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal nCode As Long, ByVal wParam As Long, lParam As Any) As Long
    Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long
    Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Declare Function GetClientRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
    Declare Sub MoveMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal Destination As Any, ByVal Source As Any, ByVal Length As Long)
    Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
    Dim hwnd As Long, lMouseHook As Long
End  If

Const WH_MOUSE_LL = 14
Const WM_MOUSEWHEEL = &H20A
Const HC_ACTION = 0
Const WM_LBUTTONDOWN = &H201
Const WM_LBUTTONUP = &H202
Const MK_LBUTTON = &H1
Const SM_CXVSCROLL = 2

Dim oComboBox As Object

Sub SetComboBoxHook(ByVal Control As Object)
    Dim tpt As POINTAPI
    Dim sBuffer As String
    Dim lRet As Long
   
    Set oComboBox = Control
    RemoveComboBoxHook
    GetCursorPos tpt
    #If  Win64 Then
        Dim lPt As LongPtr
        CopyMemory lPt, tpt, LenB(tpt)
        hwnd = WindowFromPoint(lPt)
    #Else
        hwnd = WindowFromPoint(tpt.x, tpt.y)
    #End  If
    sBuffer = Space(256)
    lRet = GetClassName(GetParent(hwnd), sBuffer, 256)
    If InStr(Left(sBuffer, lRet), "MdcPopup") Then
        SetFocus hwnd
        #If  Win64 Then
            lMouseHook = SetWindowsHookEx(WH_MOUSE_LL, AddressOf MouseProc, Application.HinstancePtr, 0)
        #Else
            lMouseHook = SetWindowsHookEx(WH_MOUSE_LL, AddressOf MouseProc, Application.Hinstance, 0)
        #End  If
    End If
End Sub

Sub RemoveComboBoxHook()
    UnhookWindowsHookEx lMouseHook
End Sub

#If  VBA7 Then
    Function MouseProc(ByVal nCode As Long, ByVal wParam As LongPtr, lParam As MSLLHOOKSTRUCT) As LongPtr
#Else
    Function MouseProc(ByVal nCode As Long, ByVal wParam As Long, lParam As MSLLHOOKSTRUCT) As Long
#End  If

    Dim sBuffer As String
    Dim lRet As Long
    Dim tRect As RECT
       
    sBuffer = Space(256)
    lRet = GetClassName(GetActiveWindow, sBuffer, 256)
    If Left(sBuffer, lRet) = "wndclass_desked_gsk" Then Call RemoveComboBoxHook
    If IsWindow(hwnd) = 0 Then Call RemoveComboBoxHook
   
    If (nCode = HC_ACTION) Then
        If wParam = WM_MOUSEWHEEL Then
            #If  Win64 Then
                Dim lPt As LongPtr
                Dim Low As Long, High As Long
                Dim lParm As LongPtr
                CopyMemory lPt, lParam.pt, LenB(lParam.pt)
                If WindowFromPoint(lPt) = hwnd Then
            #Else
                Dim Low As Integer, High As Integer
                Dim lParm As Long
                If WindowFromPoint(lParam.pt.x, lParam.pt.y) = hwnd Then
            #End  If
                    GetClientRect hwnd, tRect
                    If lParam.mouseData > 0 Then
                        Low = tRect.Right - (GetSystemMetrics(SM_CXVSCROLL) / 2)
                        High = tRect.Top + ((GetSystemMetrics(SM_CXVSCROLL) / 2) + 1)
                        lParm = MakeLong_32_64(Low, High)
                    Else
                        Low = tRect.Right - (GetSystemMetrics(SM_CXVSCROLL) / 2)
                        High = tRect.Bottom - ((GetSystemMetrics(SM_CXVSCROLL) / 2) + 1)
                        lParm = MakeLong_32_64(Low, High)
                    End If
                    PostMessage hwnd, WM_LBUTTONDOWN, MK_LBUTTON, lParm
                    PostMessage hwnd, WM_LBUTTONUP, MK_LBUTTON, lParm
            #End If
        End If
    End If
   
    MouseProc = CallNextHookEx(lMouseHook, nCode, wParam, ByVal lParam)
End Function

#If  Win64 Then
    Function MakeLong_32_64(ByVal wLow As Long, ByVal wHigh As Long) As LongPtr
    Dim retVal As LongPtr, b(3) As Byte
   
    MoveMemory ByVal VarPtr(b(0)), ByVal VarPtr(wLow), 4
    MoveMemory ByVal VarPtr(b(2)), ByVal VarPtr(wHigh), 4
    MoveMemory ByVal VarPtr(retVal), ByVal VarPtr(b(0)), 8
    MakeLong_32_64 = retVal
#Else
    Function MakeLong_32_64(ByVal wLow As Integer, ByVal wHigh As Integer) As Long
    Dim retVal As Long, b(3) As Byte
   
    MoveMemory ByVal VarPtr(b(0)), ByVal VarPtr(wLow), 2
    MoveMemory ByVal VarPtr(b(2)), ByVal VarPtr(wHigh), 2
    MoveMemory ByVal VarPtr(retVal), ByVal VarPtr(b(0)), 4
    MakeLong_32_64 = retVal
#End  If
    End Function

2- Code in the module of the worksheet where the combobox is embeeded :
Rich (BB code): 
Option Explicit

Private Sub ComboBox1_MouseMove(ByVal Button As Integer, ByVal Shift As Integer, ByVal x As Single, ByVal y As Single)
    Call SetComboBoxHook(ComboBox1)
End Sub

Private Sub ComboBox1_LostFocus()
    Call RemoveComboBoxHook
End Sub

Private Sub ComboBox1_Change()
    'change event not affected by the hook.
End Sub
 
Last edited by a moderator:
Upvote 0
Sorry, I have been searching for quite a time to find a solution to scrolling a listbox in a userform I failed to notice that this code was for comboboxes embedded in a worksheet not user form.
 
Upvote 0
DarkGlobus1OO said:
i tried to work with peter Peter Thornton (Excel MVP 2008-13) code which works amazing for userform Comboxes and listboxes but im a vba noobie and i cant seem to understand how to make this code work for a regular ComboBox on a worksheet

Module Code:
Rich (BB code): 
'Enables mouse wheel scrolling in controls
Option Explicit


#If  Win64 Then
    Private Type POINTAPI
       XY As LongLong
    End Type
#Else 
    Private Type POINTAPI
           X As Long
           Y As Long
    End Type
#End  If


Private Type MOUSEHOOKSTRUCT
    Pt As POINTAPI
    hWnd As Long
    wHitTestCode As Long
    dwExtraInfo As Long
End Type


#If   VBA7 Then
    Private Declare PtrSafe Function FindWindow Lib "user32" _
                                            Alias "FindWindowA" ( _
                                                            ByVal lpClassName As String, _
                                                            ByVal lpWindowName As String) As Long ' not sure if this should be LongPtr
    #If   Win64 Then
        Private Declare PtrSafe Function GetWindowLongPtr Lib "user32" _
                                            Alias "GetWindowLongPtrA" ( _
                                                            ByVal hWnd As LongPtr, _
                                                            ByVal nIndex As Long) As LongPtr
    #Else 
        Private Declare PtrSafe Function GetWindowLong Lib "user32" _
                                            Alias "GetWindowLongA" ( _
                                                            ByVal hWnd As LongPtr, _
                                                            ByVal nIndex As Long) As LongPtr
    #End   If
    Private Declare PtrSafe Function SetWindowsHookEx Lib "user32" _
                                            Alias "SetWindowsHookExA" ( _
                                                            ByVal idHook As Long, _
                                                            ByVal lpfn As LongPtr, _
                                                            ByVal hmod As LongPtr, _
                                                            ByVal dwThreadId As Long) As LongPtr
    Private Declare PtrSafe Function CallNextHookEx Lib "user32" ( _
                                                            ByVal hHook As LongPtr, _
                                                            ByVal nCode As Long, _
                                                            ByVal wParam As LongPtr, _
                                                           lParam As Any) As LongPtr
    Private Declare PtrSafe Function UnhookWindowsHookEx Lib "user32" ( _
                                                            ByVal hHook As LongPtr) As LongPtr ' MAYBE Long
    'Private Declare PtrSafe Function PostMessage Lib "user32.dll" _
    '                                         Alias "PostMessageA" ( _
    '                                                         ByVal hwnd As LongPtr, _
    '                                                         ByVal wMsg As Long, _
    '                                                         ByVal wParam As LongPtr, _
    '                                                         ByVal lParam As LongPtr) As LongPtr   ' MAYBE Long
    #If   Win64 Then
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" ( _
                                                            ByVal Point As LongLong) As LongPtr    '
    #Else 
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" ( _
                                                            ByVal xPoint As Long, _
                                                            ByVal yPoint As Long) As LongPtr    '
    #End   If
    Private Declare PtrSafe Function GetCursorPos Lib "user32" ( _
                                                            ByRef lpPoint As POINTAPI) As LongPtr   'MAYBE Long
#Else 
    Private Declare Function FindWindow Lib "user32" _
                                            Alias "FindWindowA" ( _
                                                            ByVal lpClassName As String, _
                                                            ByVal lpWindowName As String) As Long
    Private Declare Function GetWindowLong Lib "user32.dll" _
                                            Alias "GetWindowLongA" ( _
                                                            ByVal hWnd As Long, _
                                                            ByVal nIndex As Long) As Long
    Private Declare Function SetWindowsHookEx Lib "user32" _
                                            Alias "SetWindowsHookExA" ( _
                                                            ByVal idHook As Long, _
                                                            ByVal lpfn As Long, _
                                                            ByVal hmod As Long, _
                                                            ByVal dwThreadId As Long) As Long
    Private Declare Function CallNextHookEx Lib "user32" ( _
                                                            ByVal hHook As Long, _
                                                            ByVal nCode As Long, _
                                                            ByVal wParam As Long, _
                                                           lParam As Any) As Long
    Private Declare Function UnhookWindowsHookEx Lib "user32" ( _
                                                            ByVal hHook As Long) As Long
    'Private Declare Function PostMessage Lib "user32.dll" _
    '                                         Alias "PostMessageA" ( _
    '                                                         ByVal hwnd As Long, _
    '                                                         ByVal wMsg As Long, _
    '                                                         ByVal wParam As Long, _
    '                                                         ByVal lParam As Long) As Long
    Private Declare Function WindowFromPoint Lib "user32" ( _
                                                            ByVal xPoint As Long, _
                                                            ByVal yPoint As Long) As Long
    Private Declare Function GetCursorPos Lib "user32.dll" ( _
                                                            ByRef lpPoint As POINTAPI) As Long
#End   If


Private Const WH_MOUSE_LL As Long = 14
Private Const WM_MOUSEWHEEL As Long = &H20A
Private Const HC_ACTION As Long = 0
Private Const GWL_HINSTANCE As Long = (-6)
'Private Const WM_KEYDOWN As Long = &H100
'Private Const WM_KEYUP As Long = &H101
'Private Const VK_UP As Long = &H26
'Private Const VK_DOWN As Long = &H28
'Private Const WM_LBUTTONDOWN As Long = &H201
Dim n As Long
Private mCtl As Object
Private mbHook As Boolean
#If   VBA7 Then
    Private mLngMouseHook As LongPtr
    Private mListBoxHwnd As LongPtr
#Else 
    Private mLngMouseHook As Long
    Private mListBoxHwnd As Long
#End   If
     
Sub HookListBoxScroll(frm As Object, ctl As Object)
    Dim tPT As POINTAPI
    #If  VBA7 Then
        Dim lngAppInst As LongPtr
        Dim hwndUnderCursor As LongPtr
    #Else 
        Dim lngAppInst As Long
        Dim hwndUnderCursor As Long
    #End   If
    GetCursorPos tPT
    #If   Win64 Then
        hwndUnderCursor = WindowFromPoint(tPT.XY)
    #Else 
        hwndUnderCursor = WindowFromPoint(tPT.X, tPT.Y)
    #End   If
    If TypeOf ctl Is UserForm Then
        If Not frm Is ctl Then
               ctl.SetFocus
        End If
    Else
        If Not frm.ActiveControl Is ctl Then
             ctl.SetFocus
        End If
    End If
    If mListBoxHwnd <> hwndUnderCursor Then
        UnhookListBoxScroll
        Set mCtl = ctl
        mListBoxHwnd = hwndUnderCursor
        #If   Win64 Then
            lngAppInst = GetWindowLongPtr(mListBoxHwnd, GWL_HINSTANCE)
        #Else 
            lngAppInst = GetWindowLong(mListBoxHwnd, GWL_HINSTANCE)
        #End   If
        ' PostMessage mListBoxHwnd, WM_LBUTTONDOWN, 0&, 0&
        If Not mbHook Then
            mLngMouseHook = SetWindowsHookEx( _
                                            WH_MOUSE_LL, AddressOf MouseProc, lngAppInst, 0)
            mbHook = mLngMouseHook <> 0
        End If
    End If
End Sub


Sub UnhookListBoxScroll()
    If mbHook Then
        Set mCtl = Nothing
        UnhookWindowsHookEx mLngMouseHook
        mLngMouseHook = 0
        mListBoxHwnd = 0
        mbHook = False
    End If
End Sub
#If   VBA7 Then
    Private Function MouseProc( _
                            ByVal nCode As Long, ByVal wParam As Long, _
                            ByRef lParam As MOUSEHOOKSTRUCT) As LongPtr
        Dim idx As Long
        On Error GoTo errH
        If (nCode = HC_ACTION) Then
            #If   Win64 Then
                If WindowFromPoint(lParam.Pt.XY) = mListBoxHwnd Then
                    If wParam = WM_MOUSEWHEEL Then
                        MouseProc = True
'                        If lParam.hWnd > 0 Then
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                        Else
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                        End If
'                        postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                        If TypeOf mCtl Is Frame Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        ElseIf TypeOf mCtl Is UserForm Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        Else
                             If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                             idx = idx + mCtl.ListIndex
                             If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                        End If
                    Exit Function
                    End If
                Else
                    UnhookListBoxScroll
                End If
            #Else 
                If WindowFromPoint(lParam.Pt.X, lParam.Pt.Y) = mListBoxHwnd Then
                    If wParam = WM_MOUSEWHEEL Then
                        MouseProc = True
'                        If lParam.hWnd > 0 Then
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                        Else
'                            postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                        End If
'                        postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                        If TypeOf mCtl Is Frame Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        ElseIf TypeOf mCtl Is UserForm Then
                            If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                            idx = idx + mCtl.ScrollTop
                            If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                                mCtl.ScrollTop = idx
                            End If
                        Else
                             If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                             idx = idx + mCtl.ListIndex
                             If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                        End If
                        Exit Function
                    End If
                Else
                    UnhookListBoxScroll
                End If
            #End  If
        End If
        MouseProc = CallNextHookEx( _
                                mLngMouseHook, nCode, wParam, ByVal lParam)
        Exit Function
errH:
        UnhookListBoxScroll
    End Function
#Else 
    Private Function MouseProc( _
                            ByVal nCode As Long, ByVal wParam As Long, _
                            ByRef lParam As MOUSEHOOKSTRUCT) As Long
        Dim idx As Long
        On Error GoTo errH
        If (nCode = HC_ACTION) Then
            If WindowFromPoint(lParam.Pt.X, lParam.Pt.Y) = mListBoxHwnd Then
                If wParam = WM_MOUSEWHEEL Then
                    MouseProc = True
'                    If lParam.hWnd > 0 Then
'                    postMessage mListBoxHwnd, WM_KEYDOWN, VK_UP, 0
'                    Else
'                    postMessage mListBoxHwnd, WM_KEYDOWN, VK_DOWN, 0
'                    End If
'                    postMessage mListBoxHwnd, WM_KEYUP, VK_UP, 0
                    
                    If TypeOf mCtl Is Frame Then
                        If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                        idx = idx + mCtl.ScrollTop
                        If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                            mCtl.ScrollTop = idx
                        End If
                    ElseIf TypeOf mCtl Is UserForm Then
                        If lParam.hWnd > 0 Then idx = -10 Else idx = 10
                        idx = idx + mCtl.ScrollTop
                        If idx >= 0 And idx < ((mCtl.ScrollHeight - mCtl.Height) + 17.25) Then
                            mCtl.ScrollTop = idx
                        End If
                    Else
                         If lParam.hWnd > 0 Then idx = -1 Else idx = 1
                         idx = idx + mCtl.ListIndex
                         If idx >= 0 And idx <= mCtl.ListCount - 1 Then mCtl.ListIndex = idx
                    End If
                    Exit Function
                End If
            Else
                UnhookListBoxScroll
            End If
        End If
        MouseProc = CallNextHookEx( _
        mLngMouseHook, nCode, wParam, ByVal lParam)
        Exit Function
errH:
        UnhookListBoxScroll
    End Function
#End   If


hope someone here can help me i have been scratching my head around this problem for days!
:confused::confused::confused::confused:
Click to expand...

I have tried to use this code on a userform and I am getting invalid use of AddressOf operator.

Can someone versed in this get me a demo workbook?

Thanks
Kelly
 
Upvote 0
MikeG_UK said:
Jaafar, thanks for the code. Would it be adaptable to work with ListBoxes and if so how?
Click to expand...


Hi!!! Jaafar, I have the same requirement and the same proble, I can´t use this code for ListBox.
How could I do to make it works?
Thank a lot dude!!!!
W.-
 
Upvote 0
Here is an update of the code in post #12 ... This update fixes a bug reported by some users :

Workbook demo

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

Type POINTAPI
    x As Long
    y As Long
End Type

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

Type MSLLHOOKSTRUCT
    pt As POINTAPI
    mouseData As Long
    flags As Long
    time As Long
    dwExtraInfo As Long
End Type

#If  VBA7 Then
    #If  Win64 Then
        Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal Point As LongPtr) As LongPtr
    #Else
        Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As LongPtr
    #End  If
    Declare PtrSafe Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As LongPtr, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Declare PtrSafe Function GetParent Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Declare PtrSafe Function GetActiveWindow Lib "user32" () As LongPtr
    Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
    Declare PtrSafe Function GetCursorPos Lib "user32" (ByRef lpPoint As POINTAPI) As LongPtr
    Declare PtrSafe Function SetFocus Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Declare PtrSafe Function IsWindow Lib "user32" (ByVal hwnd As LongPtr) As Long
    Declare PtrSafe Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As LongPtr, ByVal hmod As LongPtr, ByVal dwThreadId As Long) As LongPtr
    Declare PtrSafe Function CallNextHookEx Lib "user32" (ByVal hHook As LongPtr, ByVal nCode As Long, ByVal wParam As LongPtr, lParam As Any) As LongPtr
    Declare PtrSafe Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As LongPtr) As LongPtr
    Declare PtrSafe Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As LongPtr, ByVal wMsg As Long, ByVal wParam As LongPtr, ByVal lParam As LongPtr) As Long
    Declare PtrSafe Function GetClientRect Lib "user32" (ByVal hwnd As LongPtr, lpRect As RECT) As Long
    Declare PtrSafe Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
    Dim hwnd As LongPtr, lMouseHook As LongPtr
#Else
    Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As Long
    Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
    Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
    Declare Function GetActiveWindow Lib "user32" () As Long
    Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
    Declare Function GetCursorPos Lib "user32" (ByRef lpPoint As POINTAPI) As Long
    Declare Function SetFocus Lib "user32" (ByVal hwnd As Long) As Long
    Declare Function IsWindow Lib "user32" (ByVal hwnd As Long) As Long
    Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hmod As Long, ByVal dwThreadId As Long) As Long
    Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal nCode As Long, ByVal wParam As Long, lParam As Any) As Long
    Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long
    Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Declare Function GetClientRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
    Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
    Dim hwnd As Long, lMouseHook As Long
#End  If

Const WH_MOUSE_LL = 14
Const WM_MOUSEWHEEL = &H20A
Const HC_ACTION = 0
Const WM_LBUTTONDOWN = &H201
Const WM_LBUTTONUP = &H202
Const MK_LBUTTON = &H1
Const SM_CXVSCROLL = 2


Sub SetComboBoxHook(ByVal Control As Object)
    Dim tpt As POINTAPI
    Dim sBuffer As String
    Dim lRet As Long
   
    If lMouseHook = 0 Then
        GetCursorPos tpt
        #If  VBA7 And Win64 Then
            Dim lPt As LongPtr
            CopyMemory lPt, tpt, LenB(tpt)
            hwnd = WindowFromPoint(lPt)
        #Else
            hwnd = WindowFromPoint(tpt.x, tpt.y)
        #End If
        sBuffer = Space(256)
        lRet = GetClassName(GetParent(hwnd), sBuffer, 256)
        If InStr(Left(sBuffer, lRet), "MdcPopup") Then
            SetFocus hwnd
            #If VBA7 Then
                lMouseHook = SetWindowsHookEx(WH_MOUSE_LL, AddressOf MouseProc, Application.HinstancePtr, 0)
            #Else
                lMouseHook = SetWindowsHookEx(WH_MOUSE_LL, AddressOf MouseProc, Application.Hinstance, 0)
            #End  If
        End If
    End If
End Sub

Sub RemoveComboBoxHook()
    UnhookWindowsHookEx lMouseHook: lMouseHook = 0
End Sub


#If  VBA7 Then
    Function MouseProc(ByVal nCode As Long, ByVal wParam As LongPtr, lParam As MSLLHOOKSTRUCT) As LongPtr
#Else
    Function MouseProc(ByVal nCode As Long, ByVal wParam As Long, lParam As MSLLHOOKSTRUCT) As Long
#End If

    Dim sBuffer As String
    Dim lRet As Long
    Dim tRect As RECT
       
    sBuffer = Space(256)
    lRet = GetClassName(GetActiveWindow, sBuffer, 256)
    If Left(sBuffer, lRet) = "wndclass_desked_gsk" Then Call RemoveComboBoxHook
    If IsWindow(hwnd) = 0 Then Call RemoveComboBoxHook
   
    If (nCode = HC_ACTION) Then
        If wParam = WM_MOUSEWHEEL Then
            #If VBA7 And Win64 Then
                Dim lPt As LongPtr
                Dim Low As Integer, High As Integer
                Dim lParm As LongPtr
                CopyMemory lPt, lParam.pt, LenB(lPt)
                If WindowFromPoint(lPt) = hwnd Then
            #Else
                Dim Low As Integer, High As Integer
                Dim lParm As Long
                If WindowFromPoint(lParam.pt.x, lParam.pt.y) = hwnd Then
            #End  If
                    GetClientRect hwnd, tRect
                    If lParam.mouseData > 0 Then
                        Low = tRect.Right - (GetSystemMetrics(SM_CXVSCROLL) / 2)
                        High = tRect.Top + ((GetSystemMetrics(SM_CXVSCROLL) / 2) + 1)
                        lParm = MakeDWord(Low, High)
                    Else
                        Low = tRect.Right - (GetSystemMetrics(SM_CXVSCROLL) / 2)
                        High = tRect.Bottom - ((GetSystemMetrics(SM_CXVSCROLL) / 2) + 1)
                        lParm = MakeDWord(Low, High)
                    End If
                    PostMessage hwnd, WM_LBUTTONDOWN, MK_LBUTTON, lParm
                    PostMessage hwnd, WM_LBUTTONUP, MK_LBUTTON, lParm
            End If
        End If
    End If
   
    MouseProc = CallNextHookEx(lMouseHook, nCode, wParam, ByVal lParam)
End Function


Private Function MakeDWord(ByVal LoWord As Integer, ByVal HiWord As Integer) As Long
    MakeDWord = (HiWord * &H10000) Or (LoWord And &HFFFF&)
End Function



2- Code in the module of the worksheet where the combobox is embeeded ( ComboBox1 is assumed)

Rich (BB code): 
Option Explicit

Private Sub ComboBox1_MouseMove(ByVal Button As Integer, ByVal Shift As Integer, ByVal x As Single, ByVal y As Single)
    Call SetComboBoxHook(ComboBox1)
End Sub

Private Sub ComboBox1_LostFocus()
    Call RemoveComboBoxHook
End Sub

Private Sub ComboBox1_Change()
    'change event not affected by the hook.
End Sub
 
Last edited by a moderator:
Upvote 0
Hi dear forum members.

Here is a different approach that doesn't use a windows mouse hook to enable mousewheel scrolling for activex comboboxes that are emebedded on worksheets.

This approach uses the PeekMessage API which is less invasive, more stable and not prone to potential crashings ... I have carefully written this code and have tested it accross different excel/OS versions (32 as well as 64 bits) and this new approach seems to actually work better that when using the standard WH_MOUSE_LL method hook and so far I have found no issues with it.

Workbook demo.


1- API code in a standard module :
Code: 
Option Explicit

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 MSG
    [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=If"]#If[/URL]  VBA7 Then
        hwnd As LongPtr
        message As Long
        wParam As LongPtr
        lParam As LongPtr
        time As Long
        pt As POINTAPI
    [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=Else"]#Else[/URL] 
        hwnd As Long
        message As Long
        wParam As Long
        lParam As Long
        time As Long
        pt As POINTAPI
    [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=End"]#End[/URL]  If
End Type


[URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=If"]#If[/URL]  VBA7 Then
    [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=If"]#If[/URL]  Win64 Then
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal Point As LongPtr) As LongPtr
    [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=Else"]#Else[/URL] 
        Private Declare PtrSafe Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) As LongPtr
    [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=End"]#End[/URL]  If
    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 GetActiveWindow Lib "user32" () As LongPtr
    Private Declare PtrSafe Function SetFocus Lib "user32" (ByVal hwnd As LongPtr) As LongPtr
    Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As LongPtr)
    Private Declare PtrSafe Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As LongPtr, ByVal wMsg As Long, ByVal wParam As LongPtr, ByVal lParam As LongPtr) As Long
    Private Declare PtrSafe Function GetClientRect Lib "user32" (ByVal hwnd As LongPtr, lpRect As RECT) As Long
    Private Declare PtrSafe Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long

[URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=Else"]#Else[/URL] 

    Private Declare Function WindowFromPoint Lib "user32" (ByVal xPoint As Long, ByVal yPoint As Long) 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 WaitMessage Lib "user32" () 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 GetActiveWindow Lib "user32" () As Long
    Private Declare Function SetFocus Lib "user32" (ByVal hwnd As Long) As Long
    Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
    Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Private Declare Function GetClientRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
    Private Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long

[URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=End"]#End[/URL]  If


Private Const WM_MOUSEWHEEL = &H20A
Private Const WM_LBUTTONDOWN = &H201
Private Const WM_LBUTTONUP = &H202
Private Const WHEEL_DELTA = 120
Private Const MK_LBUTTON = &H1
Private Const PM_NOREMOVE = &H0
Private Const SM_CXVSCROLL = 2

Private bEnableMouseWheel As Boolean
Private oCurCombo As Object



Public Property Let EnableMouseWheel(ByVal Combobox As Object, ByVal Enable As Boolean)
    
    Dim tMsg As MSG, tRect As RECT
    Dim sBuffer As String * 256, lRet As Long
    Dim LowWord As Long, HighWord As Long, lParm As Long
     
    Application.EnableCancelKey = xlErrorHandler
    On Error GoTo UnSelectCombo
    
    bEnableMouseWheel = Enable
    
    If Not oCurCombo Is Nothing Then
        If oCurCombo Is Combobox Then
            GoTo XitLoop
        End If
    End If
    
    Set oCurCombo = Combobox
     
    If bEnableMouseWheel Then
        Debug.Print "MouseWheel Enabled for: " & oCurCombo.Name
        Do While bEnableMouseWheel
            Call WaitMessage
            If PeekMessage(tMsg, 0, 0, 0, PM_NOREMOVE) Then
                [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=If"]#If[/URL]  VBA7 And Win64 Then
                    Dim lPt As LongPtr, hwnd As LongPtr
                    CopyMemory lPt, tMsg.pt, LenB(tMsg.pt)
                    hwnd = WindowFromPoint(lPt)
                [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=Else"]#Else[/URL] 
                    Dim hwnd As Long
                    hwnd = WindowFromPoint(tMsg.pt.X, tMsg.pt.Y)
                [URL="https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=End"]#End[/URL]  If
                lRet = GetClassName(hwnd, sBuffer, 256)
                If InStr(Left(sBuffer, lRet), "F3 Server") Then
                    SetFocus hwnd
                    If tMsg.message = WM_MOUSEWHEEL Then
                        GetClientRect hwnd, tRect
                        LowWord = tRect.Right - (GetSystemMetrics(SM_CXVSCROLL) / 2)
                        If HiWord(CLng(tMsg.wParam)) = WHEEL_DELTA Then
                            HighWord = tRect.Top + ((GetSystemMetrics(SM_CXVSCROLL) / 2) + 1)
                        ElseIf HiWord(CLng(tMsg.wParam)) = -WHEEL_DELTA Then
                            HighWord = tRect.Bottom - ((GetSystemMetrics(SM_CXVSCROLL) / 2) + 1)
                        End If
                        lParm = LowWord + HighWord * &H10000
                        PostMessage hwnd, WM_LBUTTONDOWN, MK_LBUTTON, lParm
                        PostMessage hwnd, WM_LBUTTONUP, MK_LBUTTON, lParm
                    End If
                ElseIf Left(sBuffer, GetClassName(GetActiveWindow, sBuffer, 256)) = "wndclass_desked_gsk" Then
                    GoTo UnSelectCombo
                End If
            End If
            DoEvents
        Loop
    End If
    
    Exit Property
    
XitLoop:
    
    Debug.Print "MouseWheel Disabled for: " & oCurCombo.Name
    Set oCurCombo = Nothing
    Exit Property
    
UnSelectCombo:
    ActiveCell.Select

End Property


Private Function HiWord(ByVal dw As Long) As Integer
    CopyMemory HiWord, ByVal VarPtr(dw) + 2, 2
End Function



2- Code Usage:

Code in the worksheet module ( In the example below, the mousewheel is enabled for combobox1 and combobox2 but can actually be applied to any number of worksheet embedded activex comboboxes)

Code: 
Option Explicit

Private Sub ComboBox1_GotFocus()
    EnableMouseWheel(ComboBox1) = True
End Sub

Private Sub ComboBox1_LostFocus()
    EnableMouseWheel(ComboBox1) = False
End Sub


Private Sub ComboBox2_GotFocus()
    EnableMouseWheel(ComboBox2) = True
End Sub

Private Sub ComboBox2_LostFocus()
    EnableMouseWheel(ComboBox2) = False
End Sub
 
Last edited:
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