Paul DeCoursey wrote: [snip]
> Yes the model knows nothing about the controller, but the model can > only tell the view the data has changed. Here is one scenario where > the controller would need to know about the change as well. If the > view needs to change to a different view based on the new data. Doesnt this problem arise due to your view being "dumb"(as you described it below) and not querying the model about its state? > Because the view can only respond to data changes for the type of data > it handles. The controller changes between different types of views. Hmm, ok. It sounds a bit strange to me, but thats ok, i'll think about it some more and hopefully I will understand a bit better. > In my app we have a basic ItemType and from that there are > specialized types, like collection and asset. So from a collection we > can ask the controller to get an item from the collection which could > be an asset or another collection. At this point we don't know what > kind of item it is, we could but sadly we don't. So the controller > sends the query to the model and sets the view to a loading state. > When the data is received the controller is notified and resets to the > correct view, then the view is notified. In this case the > communication from the model to the controlled exists but the model > technically does not know anything about it. It merely dispatches an > event and doesn't care who listens to it. Another reason my app needs > this type of communication is because the controller often needs to > request other types of data in response to the data received. I could > have my view do this, but in my opinion the view should be dumb. The > view should just display information not manage it's retrieval. > Thanks for taking time to provide the example. [snip] > In the Java Blueprints they have the view sending State Queries to the > model, I don't like that because it adds intelligence to the view. > The view really needs to be for display only. But I do realize that > this is really the Presentation-Abstraction-Control pattern that I use > and describe to some extent. [snip] >>cheers, > > Cheers was a great show, I still watch it from time to time in > syndication. Personally I was never a fan, I prefer Becker. oompa-loompa, shaun
