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Smuggler   (2001-12-18 14:01) [0]

The people, tell me, pliz, how to do in the UNDO subject on the principle of Word, i.e. so that you can cancel not one, but several recent actions. If it is possible, throw ...



fag2000@ok.ru   (2001-12-18 14:12) [1]

It is necessary to remember the actions of the user and in the case of cancellation to produce the reverse of them.



Vasay   (2001-12-18 15:10) [2]

In my opinion, it is better to memorize text states (not all actions are reversible)



fag2000@ok.ru   (2001-12-18 16:16) [3]

and if the document is large and there are other objects in it?



Виктор Щербаков   (2001-12-18 16:40) [4]

1) Implement class - action
2) Teach a text editor to work with these actions.
2) Implement container class - action history.

After each user action, save the reverse action in the container.
When UNDO - extract them one by one and send it to the editor.

It is better to simply warn the user about irreversible actions.
Let him save himself if he wants.



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Forum: "Main";
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