I want to implement undo/redo feature in my application. What design pattern should I use?

Question

BlackTom AI · Accepted Answer

The question asks which design pattern is appropriate for implementing undo/redo functionality in an application, with the correct option identified as Command.
Option 1: Decorator. This pattern is about extending an object's behavior by wrapping it with another object, adding responsibilities dynamically. It does not provide a natural way to capture, store, and replay user actions for undo/redo, so it is not the right choice for undo/redo control flow.
Option 2: Template Method. This pattern defines a skeleton of an algorithm in a base class and lets subclasses override certain steps. While it helps with code reuse and structure, it does not address recording and reversing a sequence of user actions, which is essential for undo/redo.
Option 3: Singleton. This creational pattern ensures a class has only one instance and provides a global point of access. It does not offer any direct mechanism for capturing or reversing actions, and using a singleton does not inherently support undo/redo semantics.
Option 4: Command. This behavioral pattern encapsulates a request as an object, enabling parameterization of clients with queues, logs, or undo/redo stacks. Each user action is represented as a command object that can be executed, undone, or redone, which directly supports implementing undo/redo functionality by maintaining a stack of executed commands and reversing them as needed. This aligns with common architectural approaches for undo/redo.
In summary, among the listed patterns, the Command pattern uniquely provides the structure needed to encapsulate actions and facilitate undo/redo operations by treating actions as first-class objects that can be recorded and replayed.

I want to implement undo/redo feature in my application. What design pattern should I use?单项选择题

类似问题

Which of the following statements is False regarding the post-closing trial balance?

A closing entry may include a Blank ______.

Earnings per share is reported at the Blank ______ of the income statement.

Table 3 shows the short-run production costs for a car wash: [table] Costs | Cost per month ($) Land lease | 4,000 Workers’ wages | 2,600 Car wash machines | 3,000 Water | 1,500 Cleaning chemicals | 900 [/table] In the short run, calculate the car wash's fixed costs in Table 3.

During the closing process, the closing entry to reduce the sales revenue normal account balance to requires the revenue account be debited.

As of December 31, $2,500 of interest expense has accrued on a $50,000 note payable. The note payable and the accrued interest will become due and payable next year. How will the interest affect the adjustments at the end of the period?

Positive economic profit is the same as?

Which of the following is the best example of a homogeneous product?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单