我有一个触发“Worksheet_SelectionChange”事件的宏。宏验证一列的数据,如果错误,它会更改单元格的背景颜色。
问题是在运行宏之后,它会清除所有文档的更改历史(Ctrl Z),甚至是我没有验证的其他单元格的历史更改。
我怎么解决这个问题?
谢谢。
我遇到了这个问题,最后不得不创建自定义撤消功能。除了以下内容外,它的工作方式与本机撤消非常相似。我相信他们可以通过更多的关注来处理。
1) 自定义撤消不会撤消格式化。只有文字。
2)自定义撤消一直到自定义堆栈的末尾。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项之间切换。
2.1) 没有重做功能。
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
类模块 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将以下代码附加到其事件中。
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
正如其他人所说,没有办法阻止更改工作表的宏清除撤消堆栈。
作为另一个副作用,如果不编写自己的撤消例程,您也无法撤消宏,这可能是一个巨大的麻烦。
这是希望MS在未来改变这一点。