Building event driven systems








The ocempgui.events module provides a small and fast event management system. It is currently separated into three different classes, of which the most important is the EventManager class. Besides theEventManager, an Event class for sending event data and an EventCallback class for connecting functions or methods to signals are available.
To create an own event driven application system or to enhance an existing application, only a few guidelines have to be respected and only a minimal set of changes be made on existing code. You will need to enable objects to receive events,
set up the event management system.

To understand, what you are doing and to know the pitfalls of the event management system, you first have to know, how it works. The next subsection will give you a short explanation of it.

How the event management works
The event management system of OcempGUI uses a simple approach using signal slots. This means, that objects will register themselves only for specific event types, of which they want to be notified. Any other event will not be sent to them.This reduces the overhead of events the objects have to deal with (either by dropping or processing them) and improves the performance and scalability of the event management system (especially with many objects).