Created by Jerry Wang on Dec 09, 2014
It is very common to use get_next method of a collection wrapper instance, which will delegate to the corresponding method of bol collection instance:
Just click F5 to view how this event is handled:
If we have hierarchical context node in a UI view, we set up connections among them in method CONNECT_NODES of context node class. Connections means if the focus on a parent node has changed, the focus of all dependent nodes registered via CONNECT_NODES will be refreshed automatically.
how to react on focus_change event?
Then our registered event handler on FOCUS_CHANGED will be triggered: