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vba trigger on variable
' Adds a user defined trigger (OnChange event) on a class attribute
' Msgbox when Name (clsMyClass) is changed
' Add class module clsMyClass:
Private WithEvents mName As clsWithEvents
Private Sub mName_OnChange(ByVal pValue As String)
MsgBox "Value changed to " & pValue
End Sub
Public Property Get Name() As clsWithEvents
Set Name = mName
End Property
Public Property Let Name(pClsName As clsWithEvents)
Set mName = pClsName
End Property
'Add class module clsWithEvents
Public Event OnChange(ByVal pValue As String)
Private mCurrentValue As String
Public Property Get Value() As String
Value = mCurrentValue
End Property
Public Property Let Value(ByVal pValue As String)
If mCurrentValue <> pValue Then RaiseEvent OnChange(pValue)
mCurrentValue = pValue
End Property
' Test in a module:
Sub TestMe()
Dim cMyClass As New clsMyClass
Dim cName As New clsWithEvents
cMyClass.Name = cName
cName.Value = "New value" ' Triggers a msgbox
End Sub
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