Re: Design Question: Bindings & Custom Views
Re: Design Question: Bindings & Custom Views
- Subject: Re: Design Question: Bindings & Custom Views
- From: "Oleg Krupnov" <email@hidden>
- Date: Thu, 28 Aug 2008 13:26:12 +0300
> I think there are times when it's appropriate to have wrapper objects - that
> are view related - for your model objects. In an image browser, it's likely
> that there is a "thumbnail" object that draws "image" objects.
Yeah, maybe "view-related wrapper objects for model objects" is the right term.
In your image browser example, this problem sounds as follows: where
to store the cached thumbnail images, to avoid re-creating them anew
in each drawRect call? Also, if a thumbnail is in process of dragging
inside the custom view, where to save the flag that the thumbnail
should be highlighted, the next time we draw it in drawRect?
I thought this kind of problem should be well-known and commonplace
among Cocoa developers...
> So maybe your custom view creates "thumbnails" for the shapes it needs to
> draw and keeps the view-related properties and states in those objects -
> instead of adding them to the shape objects themselves? It's a little crude
> - but from what I can understand about your problem - it could be a place
> for you to start separating the model and view in your design.
I am not sure I understood this phrase. Why is it crude? Anyway, I am
looking to solve the problem in the standard way, not reinvent
anything.
On Thu, Aug 28, 2008 at 1:03 PM, Cathy Shive <email@hidden> wrote:
>
> On Aug 28, 2008, at 11:06 AM, Oleg Krupnov wrote:
>
>> In other words, I need a way to associate additional
>> custom-view-specific properties with model object, without adding them
>> as transitive properties to the model. What is the best way to do
>> this? Or maybe your point is that this is a bad idea at all and such
>> problem should not arise, and I need to include everything in the
>> model? What is the standard workaround suggested in Cocoa?
>
> Hi Oleg,
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> HTH,
> Cathy
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