Shulou(Shulou.com)06/01 Report--

This article mainly explains "what is the structure of web state mode". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "what is the structure of web state mode"!

structure

State patterns provide a way for designers to design the behavior of objects based on their state.

Context is the owner of the state. For example, the example of graphic editing software mentioned in the previous article, for adding new graphics, selecting graphics and other states, Context is the editing screen. One thing to add here: in editing software, the editing screen can be thought of as a real object, and the state is more or less a virtual thing to organize the function of the editing screen. It can be considered that the significance of state existence lies in exerting certain influence on the context class Context. The means of influence is to call the interface of context class Context.

The state class State is used to define the basic interface used by the context, which generally includes accepting notifications and controlling the behavior of the state class. For example, accept requests, state switches, entry and exit actions, etc. In most cases these interfaces are only available for context class calls, meaning that there are only one-way dependencies. Most of this content can be commonalized if carefully designed.

The concrete state class ConcreteState handles content related to the actual application. In the processing of the concrete state class, the state of the context class is actually obtained, the request of the context class is accepted, and the processing result is returned to the context class. This is also the value of the existence of state classes.

effect

Before the state mode, code for handling various cases was mixed in one place, and judgment statements were needed to choose between different contents before many processes; after the state mode, the code for each case has a separate execution space (State), thus achieving isolation between code for handling different cases.

Code belonging to the same state is encapsulated in a single class, allowing designers to think about only one thing at a time, rather than picking their current focus from a jumble of decisions.

After the state is classified independently, on the one hand, the designer can understand the behavior of the context class from a higher level without details; on the other hand, after the state is independent, it is possible (in fact, a large probability) to appear some state classes that can have the same or similar functions, which can effectively promote code reuse.

At this point, I believe that everyone has a deeper understanding of "what is the structure of the web state mode," so let's actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.