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vba event variable change
' 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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