Kevin,
I recall some discussions involving Tom, Boris,and Eric about supporting
exactly this kind of live feedback based on changes to the model. It
makes the running application just like a WYSIWYG view of the model.
Tom argued that it's best to investigate this sooner rather than later
to ensure that all the necessary infrastructure is in place.
Kevin McGuire wrote:
When showing the photo app demo in the two talks I did, one question
that came up was (an obvious one), "Why do you need to keep restarting
the RCP app after every model change?".
I don't think we've discussed this aspect, but I assume that we
eventually want to get to the point where model changes can be
realized against the live app. This matches the web DOM approach where
the way I change what is on screen is via DOM element
creation/deletion. My understanding is that EMF can provide the
change notification, its a matter of us listening and doing the
appropriate element deletion and running the factories on the new
nodes.
Btw, a super cool demo would be to modify the structure of the live
app via javascript, which you hacked live.
Some questions:
1) Do we agree this is the behaviour we want?
2) When do we we think we'd provide it?
3) I think I can imagine with the current code base how we handle
on-the-fly creation and deletion, but what about modification? Right
now the factories 'make', they don't 'modify existing'.
4) Do we need batching? Does every model change result immediately in
on-screen changes? I'm not sure how the web handles this; it doesn't
seem to require explicit batching but the changes appear to come out
as one change (might just be it all happens so fast it looks like one
change).
Because of the implications for (3), I think we'd like to do this work
sooner rather than later. It would also help to tell the story of why
the modelled UI is more interesting than just "I don't need this all
in plugin.xml anymore".
Regards,
Kevin
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