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UndoEngine Class

Provides undo and redo operation implementations for designers.


Namespace:  System.Activities.Presentation
Assembly:  System.Activities.Presentation (in System.Activities.Presentation.dll)

public class UndoEngine

The UndoEngine type exposes the following members.

Public methodUndoEngineInitializes a new instance of the UndoEngine class.

Public propertyIsUndoRedoInProgressGets a Boolean value that indicates whether an undo or redo operation is in process.

Public methodAddUndoUnitAdds the specified unit to the undo stack.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetRedoActionsRetrieves an IEnumerable<T> collection of redo operations.
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetUndoActionsRetrieves an IEnumerable<T> collection of undo operations.
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodRedoRemoves the last UndoUnit instance from the redo stack, and performs a redo operation on the unit. The UndoUnit instance is then put into the undo stack.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodUndoRemoves the last UndoUnit instance from the undo stack, and performs an undo operation on the unit. The UndoUnit instance is then put into the redo stack.

Public eventUndoRedoBufferChangedAn event that is raised when the buffers that hold undo and redo operations change.
Public eventUndoUnitAddedOccurs when an undo unit is added to the undo stack.
Public eventUndoUnitDiscardedOccurs when an undo unit is removed from the undo stack, without first performing an undo operation.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.