Method and apparatus for providing an undo/redo mechanism

摘要

A method is described for providing a continuous undo/redo mechanism. The method comprises the steps of: —recording a history of a plurality of time stamped events based on reversible user actions. —navigating through the history by means of a continuous user input device, —translating the position of the continuous user input device to a point in time, and—identifying and displaying an intermediary state of the history based on the point of time.

主权项

1. A method for providing a continuous undo/redo mechanism comprising acts of:
recording a history based on continuously reversible user actions; navigating through the history by means of a continuous user input device; identifying and displaying an intermediary state of the history based on a position of the continuous user input device by:
translating the position of the continuous user input device to a value of an ascending/decreasing function of timeidentifying a recorded event of a plurality of recorded events that occurred closer to the value of the ascending/decreasing function of time than any other recorded event of the plurality of recorded events;determining the intermediary state corresponding to the value using an interpolation algorithm; anddisplaying the determined intermediary state.