A structure for efficient update, incremental redisplay and undo in graphical editors

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Abstract
The design of a graphical editor requires a solution to a number of problems, including how to (1) support incremental redisplay, (2) control the granularity of display updates, (3) provide efficient access and modification to the underlying data structure, (4) handle multiple views of the same data and (5) support Undo operations. It is most important that these problems be solved without sacrificing program modularity. A new data structure, called an ItemList, provides a solution to these problems. ItemLists maintain both multiple views and multiple versions of data to simplify Undo operations and to support incremental display updates. The implementation of ItemLists is described and the use of ItemLists to create graphical editors is presented.

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