UndoTransactionState Enumeration
Holds the state of the transaction.
Namespace: Microsoft.VisualStudio.Text.Operations
Assembly: Microsoft.VisualStudio.Text.Logic (in Microsoft.VisualStudio.Text.Logic.dll)
Syntax
声明
Public Enumeration UndoTransactionState
public enum UndoTransactionState
public enum class UndoTransactionState
type UndoTransactionState
public enum UndoTransactionState
Members
| Member name | Description | |
|---|---|---|
| Open | The initial state of the transaction, after it has been created and before it is canceled or completed. | |
| Completed | The transaction is no longer being defined, and is eligible for undo. | |
| Canceled | The transaction is no longer being defined, but has been aborted and cleared. | |
| Redoing | A transient state set by the Do operation, between the undone state and the completed state. | |
| Undoing | A transient state set by the Undo operation, between the completed state and the undone state. | |
| Undone | The Undo operation was called after completion. | |
| Invalid | The transaction has been removed from the undo history stack, for example because it was on the redo stack when a new operation cleared the redo stack. After a transaction is invalid, it should not be used for anything. |
Remarks
There are five transaction state:
Open transactions are being defined.
Canceled transactions have been aborted and are empty.
Completed and undone transactions have been defined and are ready for undo and redo, respectively.
Undoing and redoing are transient states as the transaction passes between completed and undone.
Invalid is a state for transactions that have expired.