Multiple level undo/redo mechanism

Details Multiple level undo/redo mechanism Multiple level undo/redo mechanism

G - Physics

06

F

G06F 11/14 (2006.01) G06F 3/033 (2006.01) G06F 9/44 (2006.01) G06F 15/20 (1990.01)

Patent

CA 2121107

A multiple-level undo/redo mechanism is provided in an operating system and is available to application programs run on the operating system. The operating system provides a mechanism for keeping a log of user commands and providing a cursor to a position within the log. Each command may be encapsulated into an object that supports an interface for performing undo/redo operations. Similarly, the log may be encapsulated into an object that supports operations that facilitate a multiple-level undo/redo. A user may perform a single undo/redo operation, multiple successive undo/redo operations or complete undo/redo operations.

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