Application.EndUndoScope method (Visio)

Článek
07/12/2022

Ends or cancels a transaction that has a unique scope.

Syntax

expression.EndUndoScope (nScopeID, bCommit)

expression A variable that represents an Application object.

Parameters

Name	Required/Optional	Data type	Description
nScopeID	Required	Long	The ID of the scope to close.
bCommit	Required	Boolean	A flag indicating that the changes made during the scope should be accepted (True) or canceled (False).

Return value

Nothing

Remarks

If you need to know whether events you receive are the result of a particular operation that you initiated, use the BeginUndoScope and EndUndoScope methods to wrap your operation. In your event handlers, use the IsInScope property to test whether the scope ID returned by the BeginUndoScope method is part of the current context. Make sure that you clear the scope ID that you stored from the BeginUndoScope property when you receive the ExitScope event with that ID.

You must balance calls to the BeginUndoScope method with calls to the EndUndoScope method. If you call the BeginUndoScope method, you should call the EndUndoScope method as soon as you are done with the actions that constitute your scope. Also, while actions to multiple documents should be robust within a single scope, closing a document may have the side effect of clearing the undo information for the currently open scope as well as clearing the undo and redo stacks. If that happens, passing bCommit = False to EndUndoScope does not restore the undo information.

You can also use the BeginUndoScope and EndUndoScope methods to add an action defined by an add-on to the Microsoft Visio undo stream. This is useful when you are operating from modeless scenarios where the initiating agent is part of an add-on's user interface or a modeless programmatic action.

Note

Most Visio actions are already wrapped in internal undo scopes, so add-ons running within the application don't need to call this method.

If your Visual Studio solution includes the Microsoft.Office.Interop.Visio reference, this method maps to the following type:

Microsoft.Office.Interop.Visio.IVApplication.EndUndoScope(int, bool)

Example

This example shows how to use the EndUndoScope method to end a transaction that has a unique scope ID for an instance of Visio.

 
Private WithEvents vsoApplication As Visio.Application  
Private lngScopeID As Long 
     
Public Sub EndUndoScope_Example()  
 
    Dim vsoShape As Visio.Shape  
 
    'Set the module-level application variable to  
    'trap Application-level events.  
    Set vsoApplication = Visio.Application  
 
    'Begin a scope and set the module-level variable.  
    lngScopeID = vsoApplication.BeginUndoScope("Draw Shapes")  
 
    'Draw three shapes.  
    Set vsoShape = ActivePage.DrawRectangle(1, 2, 2, 1) 
  
    ActivePage.DrawOval 3, 4, 4, 3  
    ActivePage.DrawLine 4, 5, 5, 4  
 
    'Change a cell to trigger a CellChanged event.  
    vsoShape.Cells("Width").Formula = 5  
 
    'End and commit this scope.  
    vsoApplication.EndUndoScope lngScopeID, True  
 
End Sub    
 
Private Sub vsoApplication_CellChanged(ByVal Cell As IVCell)  
 
    'Check to see if this cell change is the result of something  
    'happening within the scope.  
    If vsoApplication.IsInScope(lngScopeID) Then  
        Debug.Print Cell.Name & " changed in scope "; lngScopeID  
    End If 
   
End Sub   
 
Private Sub vsoApplication_EnterScope(ByVal app As IVApplication, _  
    ByVal nScopeID As Long, _  
    ByVal bstrDescription As 
     String)  
 
    If vsoApplication.CurrentScope = lngScopeID Then  
        Debug.Print "Entering my scope " & nScopeID  
    Else  
        Debug.Print "Enter Scope " & bstrDescription & "(" & nScopeID & ")"  
    End If 
   
End Sub   
 
Private Sub vsoApplication_ExitScope(ByVal app As IVApplication, _  
    ByVal nScopeID As Long, _  
    ByVal bstrDescription As String, _  
    ByVal bErrOrCancelled As Boolean)  
 
    If vsoApplication.CurrentScope = lngScopeID Then  
        Debug.Print "Exiting my scope " & nScopeID  
    Else  
        Debug.Print "Exit Scope " & bstrDescription & "(" & nScopeID & ")"  
    End If  
  
End Sub

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