Question

我有一个在“Worksheet_SelectionChange”事件中触发的宏。宏验证一列的数据，如果错误，它会改变单元格的背景颜色。

问题是在运行宏之后，它清除了所有文档的更改历史（Ctrl Z），甚至是我未验证的其他单元格的历史更改。

我该如何解决这个问题？

感谢。

Answer 1

我遇到了这个问题，最后不得不创建自定义撤消功能。除了以下内容之外，它与本机撤消非常相似。我相信他们可以得到更多关注。

1）自定义撤消不撤消格式化。只有文字。

2）自定义撤消一直到自定义堆栈结束。一旦发生这种情况，堆栈就会被清除，并且不会像在本机撤消功能中那样在最后两个项目之间切换。

2.1）没有REDO功能。

Download a working copy of this code.

VBAProject Layout Screenshot

模块UndoModule

Public UndoStack() As UndoStackEntry
Private Const UndoMaxEntries = 50

Public Sub SaveUndo(ByVal newUndo As UndoStackEntry)

    'Save the last undo object
    If Not newUndo Is Nothing Then
        Call AddUndo(newUndo)
    End If

End Sub

Public Sub Undo()

    'Appy last undo from the stack and remove it from the array
    Dim previousEdit As UndoStackEntry
    Set previousEdit = GetLastUndo()
    If Not previousEdit Is Nothing Then
        Dim previousEventState As Boolean: previousEventState = Application.EnableEvents
        Application.EnableEvents = False
        Range(previousEdit.Address).Select
        Range(previousEdit.Address).Value = previousEdit.Value
        Application.EnableEvents = previousEventState

        Call RemoveLastUndo
    End If

End Sub

Private Function AddUndo(newUndo As UndoStackEntry) As Integer

    If UndoMaxEntries < GetCount() Then
        Call RemoveFirstUndo
    End If

    On Error GoTo ErrorHandler

    ReDim Preserve UndoStack(UBound(UndoStack) + 1)
    Set UndoStack(UBound(UndoStack)) = newUndo

    AddUndo = UBound(UndoStack)

ExitFunction:
    Exit Function

ErrorHandler:
    ReDim UndoStack(0)
    Resume Next

End Function

Private Function GetLastUndo() As UndoStackEntry

    Dim undoCount As Integer: undoCount = GetCount()
    If undoCount > 0 Then
        Set GetLastUndo = UndoStack(undoCount - 1)
    End If

End Function

Private Function RemoveFirstUndo() As Boolean

    On Error GoTo ExitFunction

    RemoveFirstUndo = False
    Dim i As Integer
    For i = 1 To UBound(UndoStack)
        Set UndoStack(i - 1) = UndoStack(i)
    Next i
    ReDim Preserve UndoStack(UBound(UndoStack) - 1)
    RemoveFirstUndo = True

    ExitFunction:
       Exit Function

End Function

Private Function RemoveLastUndo() As Boolean

    RemoveLastUndo = False
    Dim undoCount As Integer: undoCount = GetCount()
    If undoCount > 1 Then
        ReDim Preserve UndoStack(undoCount - 2)
        RemoveLastUndo = True
    ElseIf undoCount = 1 Then
        Erase UndoStack
        RemoveLastUndo = True
    End If

End Function

Private Function GetCount() As Long

    GetCount = 0
    On Error Resume Next
    GetCount = UBound(UndoStack) + 1

End Function

课程模块UndoStackEntry

 Public Address As String
 Public Value As Variant

还需要附加到WORKBOOK Excel对象上的以下事件。

Public Sub WorkbookUndo()

    On Error GoTo ErrHandler
    ThisWorkbook.ActiveSheet.PageUndo

ErrExit:
    Exit Sub

ErrHandler:
    On Error GoTo ErrExit
    Application.Undo
    Resume ErrExit

End Sub

最后，您需要撤消工作的每个工作表都应该在其事件中附加以下代码。

Dim tmpUndo As UndoStackEntry
Dim pageUndoStack() As UndoStackEntry

Private Sub OnSelectionUndoCapture(ByVal Target As Range)
    Set tmpUndo = New UndoStackEntry
    tmpUndo.Address = Target.Address
    tmpUndo.Value = Target.Value
    UndoModule.UndoStack = pageUndoStack
End Sub

Private Sub OnChangeUndoCapture(ByVal Target As Range)
    Application.OnKey "^{z}", "ThisWorkbook.WorkbookUndo"
    Application.OnUndo "Undo Procedure", "ThisWorkbook.WorkbookUndo"

    If Not Application.Intersect(Target, Range(tmpUndo.Address)) Is Nothing Then
        If Target.Value <> tmpUndo.Value Or Empty = Target.Value Then
            UndoModule.UndoStack = pageUndoStack
            Call UndoModule.SaveUndo(tmpUndo)
            pageUndoStack = UndoModule.UndoStack
        End If
    End If
End Sub

Public Sub PageUndo()
    UndoModule.UndoStack = pageUndoStack
    Call UndoModule.Undo
    pageUndoStack = UndoModule.UndoStack
End Sub

Private Sub Worksheet_SelectionChange(ByVal Target As Range)

    'Stash away the value of the first cell in the selected range
    On Error Resume Next

    Call OnSelectionUndoCapture(Target)
    oldValue = Target.Value
End Sub

Private Sub Worksheet_Change(ByVal Target As Range)

    On Error Resume Next

    Application.ScreenUpdating = False
    Application.EnableEvents = False

    If tmpUndo.Value <> Target.Value Then
        'Do some stuff
    End If

    Call OnChangeUndoCapture(Target)

    Application.ScreenUpdating = True
    Application.EnableEvents = True

End Sub

Answer 2

正如其他人所说，没有办法阻止工作表更改宏清除撤消堆栈。

作为另一个副作用，如果不编写自己的撤消例程，就无法撤消宏，这可能是一个巨大的麻烦。

这是希望MS在未来改变它。

运行宏excel后，“撤消”历史按钮清除

2 个答案: