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

Today, the editor will share with you the relevant knowledge about what the motivation of web state mode is. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Intention

Provides a way to allow designers to design the behavior of objects based on their state.

motivation

Imagine a graphics editing software (such as the graphics editing function in Word) where the user can select a graphic from the toolbar and start dragging and dropping the mouse at some point in the drawing area. In the process of dragging and dropping, the screen will show the previously selected graphics, and its size is exactly within the rectangular range determined by the starting point of the drag and drop to the current position of the mouse; if no graphics are selected, the same drag-and-drop action will still form a rectangular box, but the function of this box is to select the graphics that already exist in the drawing area.

There is actually a concept called state. For the above examples, we can say that in two cases, the graphics editing software is in the state of adding new graphics and selecting graphics, respectively. Situations like this are common in the software development process. For example, the player has stop state, pause state, playback state, fast playback state, fast playback state, etc., and the action of pressing the key will be different in different states; for example, when the traffic light is in different states, the state of the light (whether or not to light, flashing light), and some digital display status will be different. In general, the concepts of state mentioned here have the following in common:

State lasts for a period of time, which is part of the meaning of the word state.

Objects behave differently in each state. The kind of behavior can be interaction with the outside world, or it can be simply expressed.

States can be migrated between states. The state will not remain the same all the time, and when an event occurs, the software will migrate from one state to another. The event can be an action of the user, triggered by the outside world, or just after a certain period of time.

From an implementation perspective, many parts of the code that deal with the above issues generally need to judge based on some data (state) to decide what to do or how to do it.

In this case, we can use the state pattern to standardize our design.

These are all the contents of the article "what is the motivation of the web state mode?" Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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.