Aucb.370
fa.editor-p
utcsrgv!utzoo!decvax!ucbvax!CAD:ARPAVAX:C70:editor-people
Thu Feb 4 14:53:23 1982
Undo questions
>From CSD.HANSEN@SU-SCORE Thu Feb 4 14:51:03 1982
I have several questions concerning an undo facility in a screen editor and
would like to get some opinions.
Is an undo facility absolutely necessary? Would you consider using an editor
which had absolutely NO undo capabilities? Should an editor allow you to undo
ANYTHING? (Including reads and writes to files?) Or should the capability
extend only to such things as undeleting/unkilling? How about getting rid of
text just inserted? Probably global changes, such as a global
replace/substitute?
Should an undo facility toggle between states? Should an undo be able to undo
an undo? Or would it be better to allow a multi-level undo/redo facility in
which a user may march back in time to previous stages in the editing
session, then march forward again? If this were allowed, how many levels
would be appropriate? An interesting problem arises if this were allowed: If
you marched back 4 levels, then starting inserting text, would the last 4
changes to the file then be lost? The worst thing you could do at that point
would be to start making changes without going forward again.
Tony Hansen
Csd.Hansen @ Su-Score
houxs!hansen @ Usenet
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