On Aug 18, 2008, at 9:46 PM, Oleg Krupnov wrote:
I could go the simple and dull way and create a separate instance of NSTextView for each box, but I am afraid this could be a waste of resources, because layout manager is costy. Also, most of time I only need to display text in boxes, not to edit it.
Costly is a relative term. Do you have thousands of these boxes, or only dozens? There are optimizations that the Cocoa frameworks themselves will make, because they have to consider the possibility that some application will need them to scale much more than most. That doesn't necessarily mean that your application needs to make the same sorts of optimizations.
The controls in the framework share text views via the field editor mechanism, for example, which helps because we have no idea how many controls an app may want to use--furthermore, that mechanism was designed at a time when machines had orders of magnitude less in the way of resources than they do today. If there's an easy and simple way to do things, but you're worried it might be too costly, I'd suggest trying it and using it until measurement shows that it actually is too costly. If you need to optimize, I think that the examples people have mentioned should show how to do it.
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