Excel UserForm 动态 TextBox 控件退出事件

Question

更新:在对象浏览器中的进一步研究...看来 MSForms.TextBox 既没有实现 .Name 属性也没有实现_Exit 事件 - 只有 _Change 事件。有没有办法确定哪个特定的 TextBox 生成了更改事件？

或者，是否可以通过这种技术使用 MSForms.Control？ Control 对象实现了 .Name 属性和 _Exit 事件。

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你能监听 TextBox 退出事件吗？类似于普通的 TextBox 事件如何工作？例如

  Private Sub TextBox1_Exit(ByVal Cancel As MSForms.ReturnBoolean)
        'Update a certain label based on the value of the TextBox
  End Sub

以下不捕获退出事件。此外，虽然我可以在本地窗口中看到为 MyTextBox 生成事件的 TextBox 的 .Name 属性，但我无法访问该信息来确定要作用于哪个标签。

此类技术改编自 this post , 和 this post , 它捕获了变化事件。

类 clsTextBox:

Private WithEvents MyTextBox As MSForms.TextBox

Public Property Set Control(tb As MSForms.TextBox)
    Set MyTextBox = tb
End Property

' Want to handle this event, but it's not caught when exiting the TextBox control
Private Sub MyTextBox_Exit(ByVal Cancel As MSForms.ReturnBoolean)
    'Debug.Print me.Control.name
    'Update a certain label based on the value of the TextBox
    Stop
End Sub

' Catching this event but can't identify the control which triggered it
Private Sub MyTextBox_Change()
    Debug.Print MyTextBox.Value ' <--- This prints the correct value
    Debug.Print Me.Control.Name ' <--- ERROR here on any variation of Me or MyTextBox
    'Update a certain label based on the value of the TextBox
    Stop
End Sub

我有一系列需要监听器的动态创建控件。代码如下:

  Option Explicit
  Dim tbCollection As Collection

  Private Sub UserForm_Initialize()
        Dim ctrl As MSForms.Control
        Dim obj As clsTextBox
        Dim acftNumber As Long
        Dim mPage As MSForms.MultiPage ' Control
        Dim lbl_acftName As MSForms.Label
        Dim lbl_currentHrs As MSForms.Label
        Dim lbl_hrsDUE As MSForms.Label
        Dim lbl_dateXFRIn As MSForms.Label
        Dim lbl_dateXFROut As MSForms.Label
        Dim lbl_hrsOnXFROut As MSForms.Label
        Dim txb_currentHrs As MSForms.TextBox
        Dim txb_hrsDUE As MSForms.TextBox
        Dim txb_dateXFRIn As MSForms.TextBox
        Dim txb_dateXFROut As MSForms.TextBox
        Dim txb_hrsOnXFROut As MSForms.TextBox
        Dim i As Double
        Dim pgName As String
        Dim acftName As String

        ' Correct for border size calculations bug in Excel 2016
        Me.Height = 249.75
        Me.Width = 350.25

        acftNumber = Range("aircraft").Count 'Unknown value from 3 to 10

        Set mPage = Me.multipage_file_week 'set Multipage variable

        For i = 1 To acftNumber
              'set name/title for new page
              pgName = "pg_acft_" & i
              acftName = Range("aircraft").Cells(i, 1).Value

              'mPage.Pages.Add pgName, pgTitle

              With mPage 'add acft tab
                    ' add the aircraft page to the multipage
                    .Pages.Add pgName, acftName

                    ' Aircraft Name Label
                    Set lbl_acftName = .Pages(i).Controls.Add("Forms.Label.1", "lbl_acftName_" & i, True)
                    With lbl_acftName
                          .Caption = acftName
                          .Font = "Arial"
                          .Font.Size = 12
                          .Font.Bold = True
                          .Left = 10
                          .Width = 55
                          .Top = 0
                    End With

                    ' Current Hours Label and TextBox
                    Set lbl_currentHrs = .Pages(i).Controls.Add("Forms.Label.1", "lbl_currentHrs_" & i, True)
                    With lbl_currentHrs
                          .Caption = "Current Asset Hours:"
                          .TextAlign = fmTextAlignRight
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 20
                          .Width = 120
                          .Top = 25
                    End With
                    Set txb_currentHrs = .Pages(i).Controls.Add("Forms.TextBox.1", "txb_currentHrs_" & i, True)
                    With txb_currentHrs
                          .Value = "16004.5"
                          .Text = "16004.5"
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 150
                          .Width = 70
                          .Top = 25
                    End With


                    ' Hours DUE Label and TextBox
                    Set lbl_hrsDUE = .Pages(i).Controls.Add("Forms.Label.1", "lbl_hrsDUE_" & i, True)
                    With lbl_hrsDUE
                          .Caption = "Hours next HMC DUE:"
                          .TextAlign = fmTextAlignRight
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 20
                          .Width = 120
                          .Top = 50
                    End With
                    Set txb_hrsDUE = .Pages(i).Controls.Add("Forms.TextBox.1", "txb_hrsDUE_" & i, True)
                    With txb_hrsDUE
                          .Value = "16004.5"
                          .Text = "16004.5"
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 150
                          .Width = 70
                          .Top = 50
                    End With

                    ' Date XFR In Label and TextBox
                    Set lbl_dateXFRIn = .Pages(i).Controls.Add("Forms.Label.1", "lbl_dateXFRIn_" & i, True)
                    With lbl_dateXFRIn
                          .Caption = "Estimated arrival date:"
                          .TextAlign = fmTextAlignRight
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 20
                          .Width = 120
                          .Top = 75
                    End With

                    Set txb_dateXFRIn = .Pages(i).Controls.Add("Forms.TextBox.1", "txb_hrsDUE_" & i, True)
                    With txb_dateXFRIn
                          .Value = "4/16/2019"
                          .Text = "4/16/2019"
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 150
                          .Width = 70
                          .Top = 75
                    End With


                    ' Date XFR Out Label and TextBox
                    Set lbl_dateXFROut = .Pages(i).Controls.Add("Forms.Label.1", "lbl_dateXFROut_" & i, True)
                    With lbl_dateXFROut
                          .Caption = "Estimated departure date:"
                          .TextAlign = fmTextAlignRight
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 20
                          .Width = 120
                          .Top = 100
                    End With
                    Set txb_dateXFROut = .Pages(i).Controls.Add("Forms.TextBox.1", "txb_hrsDUE_" & i, True)
                    With txb_dateXFROut
                          .Value = "4/16/2019"
                          .Text = "4/16/2019"
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 150
                          .Width = 70
                          .Top = 100
                    End With

                    ' Hours on XFR Out Label and TextBox
                    Set lbl_hrsOnXFROut = .Pages(i).Controls.Add("Forms.Label.1", "lbl_hrsOnXFROut_" & i, True)
                    With lbl_hrsOnXFROut
                          .Caption = "Desired hours remaining on departure:"
                          .TextAlign = fmTextAlignLeft
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 20
                          .Width = 170
                          .Top = 125
                    End With
                    Set txb_hrsOnXFROut = .Pages(i).Controls.Add("Forms.TextBox.1", "txb_hrsDUE_" & i, True)
                    With txb_hrsOnXFROut
                          .Value = "35"
                          .Text = "35"
                          .Font = "Arial"
                          .Font.Size = 10
                          .Font.Bold = False
                          .Left = 200
                          .Width = 35
                          .Top = 125
                    End With
              End With

              'Debug
              Debug.Print Me.multipage_file_week.Pages(i).Name & ":"
              For Each ctrl In Me.multipage_file_week.Pages(i).Controls
                    Debug.Print "  - " & ctrl.Name
              Next ctrl

        Next i
        mPage.Value = 0
        Me.Caption = FILE_WEEK_FORM_TITLE

        Set tbCollection = New Collection
        For Each ctrl In Me.Controls
              If TypeOf ctrl Is MSForms.TextBox Then
                    Set obj = New clsTextBox
                    Set obj.Control = ctrl
                    tbCollection.Add obj
              End If
        Next ctrl
        Set obj = Nothing
  End Sub

Answer 1

MSForms.Control 定义了 Enter 和 Exit 事件:如果您需要处理 TextBox.Change，那么你需要两个 WithEvents 变量:

Private WithEvents TextBoxEvents As MSForms.TextBox
Private WithEvents ControlEvents As MSForms.Control

Public Property Set Control(ByVal tb As Object)
    Set TextBoxEvents = tb
    Set ControlEvents = tb
End Property

MSForms.Control 也是您访问Name、Top、Left 等属性的界面>、可见等

提示:切勿手动键入事件处理程序过程签名。从代码 Pane 左上角的下拉列表中选择源接口(interface)，然后从右上角的下拉列表中选择要处理的事件；让 VBE 生成具有正确签名的成员。如果您在处理程序中并且左上角的下拉菜单显示“(一般)”，则您不在事件处理程序中。

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编辑

虽然上面的代码可以正常编译并且 MSForms.Control 接口(interface)确实公开了我们要处理的事件...

?TypeOf tb Is MSForms.Control
True
?TypeOf tb Is MSForms.TextBox
True

...在幕后进行了一些 COM 黑客攻击；有足够的烟雾和镜子让 VBA 成功编译上面的内容，但是，基本上，你正在寻找 Matrix 中的一个小故障(Rubberduck 的解析器与 MSForms 控件有类似的“不”问题):没有任何明显的方法来获得VBA 将动态控件对象绑定(bind)到它的 MSForms.Control 事件。