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List:       koffice-devel
Subject:    Re: Flake design
From:       Thomas Zander <zander () kde ! org>
Date:       2006-04-15 8:51:00
Message-ID: 200604151051.00754.zander () kde ! org
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In KWord I decided upon the following;

I have a class KWFrameViewManager which is per view and contains all 
frames there are. (in the form of KWFrameView instances).
This manager has some slots to make sure it gets notified if a frame is 
moved.  The result of this is that it is able to have a cache internally 
based on the Y coordinate of the frame.  This does not exactly have to be 
per page since that will take too much memory.

In another project I just build a tree with a predefined depth of 2 and a 
predefined leaf-count of 1000. Worked very fast :)  But thats 
implementation details...

So, if flake objects, like frames, have a Y coordinate then building an 
internal cache to make lookup fast I feel that you get the advantage of 
having one object which means less code to manage the objects as well as 
the speed you notice might be a problem if you get many objects.

In other words; I agree with Boudewijn here since you end up creating and 
managing the object-manager.  And you will agree that having a manager to 
manage the object-managers seems a bit silly :)

On Saturday 15 April 2006 05:21, Thorsten Zachmann wrote:
> I have a different point of view what the object manager should be. For
> me you have an object manager per view and it has a reference to all
> objects of the page/sheet. I don't think it is good to have all objects
> in one big object. It will make the handling very complicated and time
> consuming if you have a lot of objects. If we have have an object
> manager per view then one selection per object manager will is ok. This
> was however I intended it to be when I designed it.
> I can see now that this might be not what is in need for kword. So how
> is this handled at the moment in kword or how should it be for kword?
>
> Any ideas before everybody starts to implement in a different
> direction.

-- 
Thomas Zander

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