用于实施UNDO和REDO选项的数据结构 [英] data structure used to implement UNDO and REDO option

问题描述

我想实现UNDO和REDO选项（正如我们在MS Word中所见）。你可以建议我一个数据结构，我该如何实现它？

I want to implement UNDO and REDO option(as we see in MS word etc). Can you suggest me a data structure for it, and how can i implement it.?

推荐答案

它不是数据结构而是设计模式。您正在寻找指挥模式。

It isn't a data structure but a design pattern. You're looking for the Command Pattern.

标准是将Command对象保留在堆栈中以支持多级撤销。为了支持重做，第二个堆栈保存所有的Undone命令。所以当你弹出撤消堆栈来撤消一个命令时，你把你弹出的命令推到重做堆栈中。当您重做命令时，您会做相同的事情。您弹出重做堆栈，将弹出的命令推回到撤消堆栈。

The standard is to keep the Command objects in a stack to support multi level undo. In order to support redo, a second stack keeps all the commands you've Undone. So when you pop the undo stack to undo a command, you push the same command you popped into the redo stack. You do the same thing in reverse when you redo a command. You pop the redo stack and push the popped command back into the undo stack.

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