OleUndoEngine Class
Provides a default implementation of undo management for designers.
Namespace: Microsoft.VisualStudio.Shell.Design
Assembly: Microsoft.VisualStudio.Shell.Design (in Microsoft.VisualStudio.Shell.Design.dll)
Syntax
'Declaration
Public Class OleUndoEngine _
Inherits UndoEngine _
Implements IVsLinkedUndoClient
'Usage
Dim instance As OleUndoEngine
public class OleUndoEngine : UndoEngine,
IVsLinkedUndoClient
public ref class OleUndoEngine : public UndoEngine,
IVsLinkedUndoClient
type OleUndoEngine =
class
inherit UndoEngine
interface IVsLinkedUndoClient
end
public class OleUndoEngine extends UndoEngine implements IVsLinkedUndoClient
Remarks
The OleUndoEngine class provides a default implementation of the UndoEngine and IVsLinkedUndoClient interfaces used to manage undo operations, which allow users to reverse their recent changes when modifying a code element.
Hinweis
Typically, designers implemented under Visual Studio and .NET Framework are based on Control and have undo support automatically provided by the environment.
Designers will need to implement their own undo management if either:
The designer uses a graphical user interface, referred to as a ViewAdapter, other than that supplied by Control.
This will require the registry of the ViewAdapter with Visual Studio using ProvideViewAdapterAttribute.
An example of this might be creating a product with a web-based graphical design interface rather than a .NET Framework based graphical interface.
The designers do not use the Visual Studio code generation model provided in the System.CodeDom name space.
The OleUndoEngine class transparently supports child undo units, as it uses custom undo units (atomic sections of code which can be removed in an undo operation) UndoEngine.UndoUnit, which fully implement IOleUndoUnit and IOleParentUndoUnit.
Inheritance Hierarchy
System.Object
System.ComponentModel.Design.UndoEngine
Microsoft.VisualStudio.Shell.Design.OleUndoEngine
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
See Also
Reference
Microsoft.VisualStudio.Shell.Design Namespace
OleUndoEngine
OnInterveningUnitBlockingLinkedUndo()