nsITransaction 编辑

Method overview

Attributes

Methods

doTransaction()

Executes the transaction.

void doTransaction();

Parameters

None.

merge()

Attempts to merge a transaction into "this" transaction. Both transactions must be in their undo state, doTransaction() methods already called. The transaction manager calls this method to coalesce a new transaction with the transaction on the top of the undo stack. This method returns a boolean value that indicates the merge result. A true value indicates that the transactions were merged successfully, a false value if the merge was not possible or failed. If true, the transaction manager will Release() the new transaction instead of pushing it on the undo stack.

boolean merge(
  in nsITransaction aTransaction
);

Parameters

aTransaction

The previously executed transaction to merge.

Return value

Missing Description

redoTransaction()

Executes the transaction again. Can only be called on a transaction that was previously undone. In most cases, the redoTransaction method will actually call the doTransaction() method to execute the transaction again.

void redoTransaction();

Parameters

None.

undoTransaction()

Restores the state to what it was before the transaction was executed.

void undoTransaction();

Parameters

None.

See also

• nsITransactionList
• nsITransactionListener
• nsITransactionManager