add a listener to a class

hi all! so: suppose I have a class1, containing a property that is defined as a list of another class2, that has also another class3 inside. This is my object. Now suppose that I change a property value of the class3 (the last one in the tree). Or also to change a value in class2. Is it possible to have only a listener attached to class1 that is able to understand that something changed somewhere in my object? without put listeners for each property of the 3 classes? thank you, marco

Answer 1

[Daniel Shub]

If you can modify class2 and class3, then you can modify those classes to issue an event SomethingChanged, whenever a property value is set. Then class1 could listen for a single event. You could probably even include what changed in the eventdata of SomethingChanged.