Reducing WithEvent declarations and subs with VBA and ActiveX

问题

On a worksheet I have 3 ActiveX objects being TextBox1, TextBox2, ListBox1

Leaving other code out I have a class clsEvents that contains

Private WithEvents txbControl As MSForms.TextBox
Private WithEvents lisControl As MSForms.ListBox 
Private txbEvents As TextBoxEvents                          
Private lisEvents As ListBoxEvents  

Private Sub txbControl_Change()
     txbEvents.ChangeEvent txbControl
End Sub     

Private Sub lisControl_Change()
     lisEvents.ChangeEvent lisControl
End Sub                      

and the classes TextBoxEvents and ListBoxEvents contain

Public Event Changed(txtBox As MSForms.TextBox)

Public Sub ChangeEvent(txtBox As MSForms.TextBox)
    RaiseEvent Changed(txtBox)
End Sub

Public Event Changed(ByRef myListBox As MSForms.ListBox)

Public Sub ChangeEvent(lisBox As MSForms.ListBox)
    RaiseEvent Changed(lisBox)
End Sub

The worksheet module contains

Public WithEvents tbxEvents As TextBoxEvents
Public WithEvents lisEvents As ListBoxEvents

Private Sub tbxEvents_Changed(tbxBox As MSForms.TextBox)
    Debug.Print "tbxEvents_Changed " & tbxBox.Name
End Sub

Private Sub lisEvents_Changed(lisBox As MSForms.ListBox)
    Debug.Print "lisEvents_Changed " & lisBox.Name
End Sub

Private Sub TextBox2_Change()
    Debug.Print "TextBox2_Change"
End Sub

Private Sub TextBox1_Change()
    Debug.Print "TextBox1_Change"
End Sub

Private Sub ListBox1_Change()
    Debug.Print "ListBox1_Changed "
End Sub

If I change something in TextBox1 or TextBox2 or ListBox1 the debugwindow shows that the events first will be send to the worksheet (TextBox1_Change etc.) followed by tbxEvents_Changed or LisEvents_Changed, so it it working.

What I would like to achieve is replacing the code in clsEvents by something like

Private WithEvents objControl As OLEobject
Private txbEvents As TextBoxEvents                          
Private lisEvents As ListBoxEvents  

Private Sub objControl_Change()
     if (TypeOf objControl.Object Is MSForms.TextBox) Then
     txbEvents.ChangeEvent objControl
     elseif (TypeOf objControl.Object Is MSForms.ListBox) Then
     lisEvents.ChangeEvent objControl
     endif
End Sub                  

So basically I would like to know how I can achieve a valid definition for WithEvents that will remove the necessity for 'many' eventfunctions in clsEvents.

Public WithEvents objControl As ?????

回答1:

Open Notepad and copy code below and paste it in a new txt-file save it als CatchEvents2.cls

    VERSION 1.0 CLASS
    BEGIN
      MultiUse = -1  'True
    END
    Attribute VB_Name = "CatchEvents2"
    Attribute VB_GlobalNameSpace = False
    Attribute VB_Creatable = False
    Attribute VB_PredeclaredId = False
    Attribute VB_Exposed = False
    Private Type GUID
          Data1 As Long
          Data2 As Integer
          Data3 As Integer
          Data4(0 To 7) As Byte
    End Type

    #If VBA7 And Win64 Then
          Private Declare PtrSafe Function ConnectToConnectionPoint Lib "shlwapi" Alias "#168" (ByVal punk As stdole.IUnknown, _
                  ByRef riidEvent As GUID, ByVal fConnect As Long, ByVal punkTarget As stdole.IUnknown, ByRef pdwCookie As Long, _
                  Optional ByVal ppcpOut As LongPtr) As Long
    #Else
         Private Declare Function ConnectToConnectionPoint Lib "shlwapi" Alias "#168" (ByVal punk As stdole.IUnknown, ByRef riidEvent As GUID, _
                  ByVal fConnect As Long, ByVal punkTarget As stdole.IUnknown, ByRef pdwCookie As Long, Optional ByVal ppcpOut As Long) As Long
    #End If

    Private EventGuide As GUID
    Private Ck As Long
    Private ctl As Object
    Private CustomProp As String

    Public Sub MyChange()
    Attribute MyChange.VB_UserMemId = 2

    Debug.Print " Change ControlName " & " Type: " & TypeName(ctl) & " CustomProp: " & CustomProp
    End Sub


    Public Sub ConnectAllEvents(ByVal connect As Boolean)
          With EventGuide
              .Data1 = &H20400
              .Data4(0) = &HC0
              .Data4(7) = &H46
          End With
          ConnectToConnectionPoint Me, EventGuide, connect, ctl, Ck, 0&
    End Sub

    Public Property Let Prop(newProp As String)
          CustomProp = newProp
    End Property

    Public Property Let Item(Ctrl As Object)
          Set ctl = Ctrl
          Call ConnectAllEvents(True)
    End Property

    Public Sub Clear()
          If (Ck <> 0) Then Call ConnectAllEvents(False)
          Set ctl = Nothing
    End Sub

In your VBA editor you import this File (right click on your VBAproject and choose import)

In a normal module you put in the code below:

Private AllControls() As New CatchEvents2

Sub connect()
Dim j As Long
With Worksheets("Sheet1")
ReDim AllControls(.OLEObjects.Count - 1)
    For j = 0 To .OLEObjects.Count - 1
       AllControls(j).Item = .OLEObjects(j + 1).Object
       AllControls(j).Prop = .OLEObjects(j + 1).Name
    Next
End With
End Sub

Sub disconnect()
Dim j As Long
  For j = LBound(AllControls) To UBound(AllControls)
          AllControls(j).Clear
   Next j
      Erase AllControls
End Sub

Now when you run the connect sub every change of any activeX control is catched

Edit: after comment to put in all other events; Other events: (all these will work on userforms also)

Public Sub MyChange()
Attribute MyChange.VB_UserMemId = 2
Debug.Print "ch"
End Sub

Public Sub MyListClick()
Attribute MyListClick.VB_UserMemId = -610
Debug.Print "cl1"
End Sub

Public Sub MyClick()
Attribute MyClick.VB_UserMemId = -600
Debug.Print "cl2"
End Sub

Public Sub MyDropButtonClick()
Attribute MyDropButtonClick.VB_UserMemId = 2002
End Sub

Public Sub MyDblClick(ByVal Cancel As MSForms.ReturnBoolean)
Attribute MyDblClick.VB_UserMemId = -601
Debug.Print "dcl"
End Sub

Public Sub MyKeyDown(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)
Attribute MyKeyDown.VB_UserMemId = -602
Debug.Print "kd"
End Sub

Public Sub MyKeyUp(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)
Attribute MyKeyUp.VB_UserMemId = -604
Debug.Print "ku"
End Sub

Public Sub MyMouseDown(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)
Attribute MyMouseDown.VB_UserMemId = -605
Debug.Print "md"
End Sub

Public Sub MyMouseMove(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)
Attribute MyMouseMove.VB_UserMemId = -606
Debug.Print "mm"
End Sub

Public Sub MyMouseUp(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)
Attribute MyMouseUp.VB_UserMemId = -607
Debug.Print "mu"
End Sub

Public Sub myKeyPress(ByVal KeyAscii As MSForms.ReturnInteger)
Attribute myKeyPress.VB_UserMemId = -603
Debug.Print "kp"
End Sub

Then there are 4 (userform) events: Exit, Enter, AfterUpdate and BeforeUpdate which are events of the container-control which you can't 'catch' with withevents but in this way you can:

Public Sub myExit(ByVal Cancel As MSForms.ReturnBoolean)
Attribute myExit.VB_UserMemId = -2147384829
Debug.Print "exit"
End Sub

Public Sub MyAfterUpdate()
Attribute MyAfterUpdate.VB_UserMemId = -2147384832
Debug.Print "au"
End Sub

Public Sub MyBeforeUpdate(ByVal Cancel As MSForms.ReturnBoolean)
Attribute MyBeforeUpdate.VB_UserMemId = -2147384831
Debug.Print "bu"
End Sub

Public Sub MyEnter()
Attribute MyEnter.VB_UserMemId = -2147384830
Debug.Print "enter"
End Sub

On a worksheet you've got LostFocus and GotFocus (1541 and 1542) but these I can't get to work, so if anybody knows howto it would be great. final remark: It doesnot work on a mac

来源：https://stackoverflow.com/questions/61855925/reducing-withevent-declarations-and-subs-with-vba-and-activex