An event loop is a code structure that waits for an event and triggers a response. It can be the central logic of a program and responds to events like keyboard clicks or mouse movements. The loop prepares, polls, monitors, and submits resources to create a response.
An event loop, or main loop if that is the central control aspect, is a construct within programs that monitors and dispatches events following an initial event. The initial event can be anything, including pressing a button on a keyboard or clicking a button on a program. After polling the devices, the event loop will send an event that creates the desired effect, based on programming. This is called a loop, not because the event is continually seeking and occurring, but because the loop prepares for an event, checks for the event, dispatches an event, and repeats the process all over again.
In computer programming, there is a structure called an event loop. This is a block of code that tells the computer to wait for an event and what to do in response to the event. Sometimes the loop takes up only a small part of the code; more often it is the central logic of a coding document. When it forms the central logic, it is also called the main loop.
The event that an event loop waits for can be anything. An event can manifest from a user pressing a keyboard button, moving the mouse, opening an application, or anything else a user can do with a computer. The event usually comes from an external device, such as a keyboard or mouse, but can also be the result of internal processes. When the specified event occurs, the main loop will trigger another event in response, such as sending a letter in a document or allowing the user to access a folder.
Four processes are needed to create the event loop. The first event is called the prepare query. This prepares the program to poll the device or devices responsible for the event, so that the computer receives the appropriate resources allocated for the action. Next, the loop actually polls the devices for the event to see if the event has occurred. Last in this order is the monitor function, which returns the result of the poll to the loop.
If the event returns true, the loop continues; if not, go back to getting ready. If true, the fourth action, called submit, occurs. This is when all resources are sent to create a response to the queried event, causing a reaction. After sending, the loop goes back to preparing, preparing again to check for events.
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