InvisibleApp.EnterScope Event

Version Information
 Version Added:  Visio 2000

Syntax

Private Sub expression_EnterScope(ByVal app As [IVAPPLICATION], ByVal nScopeID As Long, ByVal bstrDescription As String)

expression   A variable that represents an InvisibleApp object.

Parameters

Remarks

The nScopeID value returned in the case of a Visio operation is the equivalent of the command-related constants that begin with visCmd*.

If you are using Microsoft Visual Basic or Visual Basic for Applications (VBA), the syntax in this topic describes a common, efficient way to handle events.

If you want to create your own Event objects, use the Add or AddAdvise method. To create an Event object that runs an add-on, use the Add method as it applies to the EventList collection. To create an Event object that receives notification, use the AddAdvise method. To find an event code for the event you want to create, see Event codes.

If you are handling this event from a program that receives a notification over a connection created by using the AddAdvise method, the EnterScope event is one of a group of selected events that record extra information in the EventInfo property of the Application object.

The EventInfo property returns bstrDescription, as described above. In addition, the varMoreInfo argument to VisEventProc contains a string formatted as follows: [<nScopeID>;<bErrOrCancelled>;<bstrDescription>;<nHwndContext>], where nHwndContext is the window handle (HWND) of the window that is the context for the command. nHwndContext could be 0.

For EnterScope, bErrOrCancelled always equals zero.

Example

This example shows how to use the EnterScope event. The example determines whether a call to a procedure that handles the CellChanged event is in a particular scope—that is, whether the call occurs between the EnterScope and ExitScope events for that scope.

Private WithEvents vsoApplication As Visio.Application 

Private lngScopeID As Long

Public Sub Scope_Example() 
 
    Dim vsoShape As Visio.Shape
 
    'Set the module-level application variable to
    'trap application-level events.
    Set vsoApplication = Application

    'Begin a scope. 
    lngScopeID = Application.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. 
    Application.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