[UI] Well, shall we do something then?

[Gary Chambers]

Isn't there just the one WeakIdentityKeyDictionary in ActionMaps on
EventManager?

I guess you mean the finalization takes longer when there are more entries
in the dictionary.

The same applies to changed/update when the model object doesn't inherit
from Model (or also Morph, with the ui enhancements loaded).

In fact, the same approach can be taken to record events directly on the
relevant object (as in the case of changed/update in the Model class).

> -----Original Message-----
> From: ui-bounces at lists.squeakfoundation.org
> [mailto:ui-bounces at lists.squeakfoundation.org]On Behalf Of David T.
> Lewis
> Sent: 19 September 2007 11:46 AM
> To: Squeak's User Interface
> Subject: Re: [UI] Well, shall we do something then?
>
>
> On Wed, Sep 19, 2007 at 12:38:44AM +0300, Igor Stasenko wrote:
> > On 18/09/2007, Gary Chambers <gazzaguru2 at btinternet.com> wrote:
> > > Well, there is the Model but there has to be a linkage for
> when the model
> > > changes. That's the basics. We need to decide on the way(s)
> we wish that to
> > > happen. I find changed/update rather inefficient. Much prefer
> when:send:to:.
> > >
> > > But that's just the start. Pretty fundamental though.
> > >
> > Yes! And i think this is the point where we should start from.
> > How to create flexible event system , how exchange data between view
> > and model. Based on that we then can build up a model which will use
> > it (MVP/Morphic whatever)
>
> A note of caution: The #when:send:to: mechanism can have serious
> performance
> issues due to its use of weak dictionaries. Performance of the
> entire image
> is seriously impacted by weak array finalization as the number of these
> dictionaries increases. There is no easy fix for this, so make sure you
> know what you are getting into before you start with an approach based
> on this mechanism.
>
> Dave
>
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