Multiple nonlinear undo buttons

Details Multiple nonlinear undo buttons Multiple nonlinear undo buttons

1996-01-16

1998-05-26

Powell, Mark R.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

345339, 395619, 395772, G06F 314

Patent

active

057573727

ABSTRACT:
A method and an apparatus for saving prior versions of a document so that the user has complete control of which versions of the document are saved, while providing a mechanism for easy retrieval of saved versions. The invention utilizes a set of icons on a screen display which when selected by a pointer device perform an action depending upon the state of the selected icon which may be one of three states.

REFERENCES:
patent: 5159669 (1992-10-01), Trigg et al.
patent: 5357631 (1994-10-01), Howell et al.
patent: 5438661 (1995-08-01), Ogawa
patent: 5546528 (1996-08-01), Johnston
patent: 5619700 (1997-04-01), Abe
Adobe Photoshop User Guide, Adobe Systems Incorporated, Version 2.5 for Macintosh. 1993, pp. 135-136.

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