Neslib.Sdl3.Events
Reference
Event queue management.
It's extremely common--often required--that an app deal with SDL's event queue. Almost all useful information about interactions with the real world flow through here: the user interacting with the computer and app, hardware coming and going, the system changing in some way, etc.
An app generally takes a moment, perhaps at the start of a new frame, to examine any events that have occurred since the last time and process or ignore them. This is generally done by overriding TSdlApp.Event (which is called for each event, just before TSdlApp.Iterate is called).
There is other forms of control, too: TSdlEvents.Peep has more functionality at the cost of more complexity, and TSdlEvents.Wait can block the process until something interesting happens, which might be beneficial for certain types of programs on low-power hardware. One may also call TSdlEvents.AddWatch to set a callback when new events arrive.
The app is free to generate their own events, too: TSdlEvents.Push allows the app to put events onto the queue for later retrieval; TSdlEvents.Register can guarantee that these events have a type that isn't in use by other parts of the system.