ITextUndoHistory Interface

Contains undo transactions.

Namespace: Microsoft.VisualStudio.Text.Operations
Assembly: Microsoft.VisualStudio.Text.Logic (in Microsoft.VisualStudio.Text.Logic.dll)

Syntax

'宣言
Public Interface ITextUndoHistory _
    Inherits IPropertyOwner

public interface ITextUndoHistory : IPropertyOwner

public interface class ITextUndoHistory : IPropertyOwner

type ITextUndoHistory =  
    interface
        interface IPropertyOwner
    end

public interface ITextUndoHistory extends IPropertyOwner

The ITextUndoHistory type exposes the following members.

	Name	Description
	CanRedo	Determines whether a single redo is possible.
	CanUndo	Determines whether a single undo is possible.
	CurrentTransaction	Gets the current undo transaction in progress.
	LastRedoTransaction	Gets the most recent (top) item of the RedoStack.
	LastUndoTransaction	Gets the most recent (top) item of the UndoStack.
	Properties	Gets the collection of properties controlled by the property owner. (Inherited from IPropertyOwner.)
	RedoDescription	Gets the description of the most recent visible redo ITextUndoTransaction.
	RedoStack	The redo stack for this history. It does not include any currently open or undo transactions.
	State	Gets the current state of the undo history.
	UndoDescription	Gets the description of the most recent visible undo ITextUndoTransaction.
	UndoStack	The undo stack for this history. It does not include any currently open or redo transactions.

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	Name	Description
	CreateTransaction	Creates a new transaction, nests it in the previously current transaction, and marks it current.
	Redo	Performs the specified number of redo operation and places the transactions on the undo stack.
	Undo	Performs the specified number of undo operations and places the transactions on the redo stack.

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	Name	Description
	UndoRedoHappened	Notifies consumers when an undo or a redo has happened on this history.
	UndoTransactionCompleted	Notifies consumers when an ITextUndoTransaction is completed and added to the UndoStack.

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Typically only one undo transaction history at a time is available to the user.