GraphUndoUnit Class

아티클
07/26/2013

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

This class represents one undoable graph change which appears on the VS undo stack.

Inheritance Hierarchy

System.Object
Microsoft.VisualStudio.GraphModel.GraphUndoUnit

Namespace: Microsoft.VisualStudio.GraphModel
Assembly: Microsoft.VisualStudio.GraphModel (in Microsoft.VisualStudio.GraphModel.dll)

Syntax

'Declaration
Public Class GraphUndoUnit

public class GraphUndoUnit

public ref class GraphUndoUnit

type GraphUndoUnit =  class end

public class GraphUndoUnit

The GraphUndoUnit type exposes the following members.

Constructors

	Name	Description
	GraphUndoUnit	Construct an undo unit from the changes that are about to be committed in the given GraphUpdatedEventArgs. This has to be called during the Graph Updating, the Updated event is too late because we must be able to save the old values before the changes are committed in order to be able to undo those changes.

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Properties

	Name	Description
	Causality	This undo unit's associated Causality.
	Description	This undo unit's description.
	Disabled	Whether this undo unit should be disabled (as determined by information found in the constructor).
	IsEmpty	Whether this undo unit is empty.
	IsRedoUnit	Whether this is a redo unit.
	IsUndoUnit	Whether this is an undo unit.
	ScopeProperties	The property bag associated with this undo unit.

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Methods

	Name	Description
	AddLink	Called during Apply if a link has to be added back to the graph. You can override this but you must call base.AddLInk.
	AddNode	Called during Apply if a node has to be added back to the graph. You can override this but you must call base.AddNode.
	Apply	Performs this undo or redo operation.
	ApplyToGraph	Applies the undo unit to a different graph.
	ApplyToNode	Applies any property or category changes on the original node to the input node.
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsRedo	Determines whether the specified GraphTransactionScope is currently being used for a redo operation.
	IsUndo	Determines whether the specified GraphTransactionScope is currently being used for an undo operation.
	IsUndoable	Return true if changes to the given property on the given graphObject are undoable or not. This method returns true if the property metadata has the IsUndoable flag set or it returns false if it does not have the IsSharable or IsSerializable flag. Also if it has IsWriteOnce then it also returns false, because the UndoStack would not be able to change the value. If false is returned then the property is not preserved across undo/redo. For transient properties returning false can save lots of memory in the undo stack.
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	RemoveLink	Called during Apply if a link has to be added back to the graph. You can override this but you must call base.RemoveLink.
	RemoveNode	Called during Apply if a node has to be removed from to the graph. You can override this but you must call base.RemoveNode.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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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.

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