Is there a forum for Java GUI Application Design?

Question

Hi all,
I've used this forum a lot and found a lot of help on it for Swing usage specifics. However, whenever I ask a question about broader design or architecture of a full Swing app I get little or no response. Sadly I'm no stranger to "view 50, replies 0" :o(
Either I'm asking stupid questions or I'm asking the in the wrong forum - does anyone know of a good place to ask about design/best practices for Java, GUI applications? I've seen some of the "programmer"/"developer" groups on Google Groups.
Many thanks.
Yours, hoping for at least one reply,
Chris

Answer 1

You're right, I typed that wrong. The method signature should be addDataChangeListener(DataChangeListener lis, DataChangeType type)
When a component registers itself as a change listener, say it wants to know whenever an object of type Foo is changed, it calls DataChangeType.addDataChangeListener(this, DataChangeType.FOO). (the Enum elements coorespond to the objects we want to listen for) Then it implements the dataChanged(DataChangeType type, Object obj) method that will be called by the controller when objects of type Foo are changed. (obviously this is an interface) Whenever a component updates an object of type Foo, it calls DataChangeControl.dataChanged(DataChangeType.FOO, theFooObject), and then the controller will notify all listeners who are interested in Foo objects changing.
The DataChangeControl maintains a hashmap of <DataChangeType, List < DataChangeListener> >. So when a new listener is added, it checks the type to see if a list is already keyed to that object type in the hashmap. If so it adds the listener to that list, if not it creates a new list in the hashmap with the type as the key. That way when an object is changed, it notifies only those listeners who are registered to listen to that type of object being changed. Hopefully that makes sense.