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On Wednesday 26 April 2006 21:33, Boudewijn Rempt wrote:
> Is this the place to start thinking about the integration of
> commands, undo/redo and threadweaver?

I've been trying to get threadweaver to compile and failed; not sure why=20
but my qmake refuses to create makefiles that automatically create the=20
mocs.

Anyway; I read the manual and threadweaver certainly looks nice, but at=20
this point I fail to see where in flake we need multithreading. Just=20
about everything is about painting or processing input. Which by=20
definition has to be single threaded.

=46or a next step I have been thinking about something I did in KWord; the=
=20
messaging part of the MVC pattern.  The idea is that the data model emits=20
signals about changes so the views can pick up on that.
Every app I know emits these changes not from the objects themselves (no=20
need to make them qobjects), but by emitting from the controller code=20
when the Shape has been moved or changed.

I suggest the InteractionStrategy notify the ShapeManager about things=20
like a move, or a delete etc.
The ShapeManager (much like KWords KWFrameViewManager) will then act as=20
distributor and re-emit the signals so that components that are=20
interrested in, for example, selectionChanged, or ShapeMoved, or=20
ShapeAdded they will get notified. The re-emitting is needed so those=20
listeners can connect to just 1 object.

The trick here is to make sure that all these events will not get fired=20
until the user interaction that caused them is processed. Since the data=20
(the Shapes and the selection etc) is not fully stable until that time.
i.e it avoids race conditions.

Anyway; I implemented that all already in KWords KWFrameViewManager, but=20
I'd like to hear your thoughts, and possibly ideas on how to integrate=20
that with threadweaver.

Sorry for going very technical, I hope the above was clear, the API docs=20
in kword might help a little as well here.
=2D-=20
Thomas Zander

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