add a listener to a class

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marco
marco 2011-7-14
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

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回答（1 个）

Daniel Shub
Daniel Shub 2011-7-19
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.

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