> The result of this is that the UI updates really frequently and the > estimated time to complete and the download rate jump around a lot. I > would love it if I could tell cocoa to only update the UI once per > second instead of immediately when the property key changes.
I don't believe there is such a feature. Though I wouldn't be surprised if someone out there has already implemented a proxy like you suggest. > With a bit of work I could probably set up a proxy object for each > download that would do something like that and use timer, but it would > be a lot of messy code. I could also just delay updating the > _bytesDownloaded on a queue. Or a third idea is to cache the estimated > calc time and rate and then only recalculate the value at most once > per second. I think if you're going to follow the MVC paradigm, you should be sure to update _bytesDownloaded immediately - that's your model, which should always be accurate. Any smoothing or aggregation or whatever else you want for UI purposes should be handled in your controller. So, either a reusable proxy object (if you'd like to stick with bindings), or just coded in your controller such that it won't update the view at more than N Hz (in which case simply modifying the UI "manually" from your controller is probably the easiest option). Either way the implementation shouldn't be that tricky - just a timer and a last-updated timestamp. _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
