Screen Controller

Screen controller is a Java or Groovy class, linked to an XML-descriptor and containing screen initialization and event handling logic.

Controller should be inherited from one of the following base classes:


If a screen does not need additional logic, it can use the base class itself as a controller – AbstractWindow, AbstractLookup or AbstractEditor, by specifying it in the XML-descriptor (these classes are not actually abstract in a sense of impossibility of instantiating). For frames, controller class can be omitted.

Controller class should be registered in class attribute of the root element window in a screen’s XML descriptor.

Figure 13. Controller Base Classes