I had thought about this too, but was afraid that -drawRect: would be called more often than the actual content of the view was being changed.
If you could limit the calls within -drawRect: perhaps by setting a content did change flag in the subclass this might reduce the notifications to be meaningful. Like: (written in mail) -drawRect:(NSRect)rect { if ( contentDidChange ) // post notification [super drawRect:rect]; } Sandor Szatmari On Apr 22, 2013, at 13:30, Jens Alfke <j...@mooseyard.com> wrote: > > On Apr 22, 2013, at 12:26 AM, Motti Shneor <su...@bezeqint.net> wrote: > >> I already succeeded in capturing the contents of the view as an image-buffer >> (out of the CALAyer's context) and I can (brutally) solve my problem by >> setting up a timer that will sample the view's contents N times a second. >> However, I'd like to avoid transmitting anything when the view doesn't change > > A quick & naive idea is to subclass UIWebView and override -drawRect: to call > the inherited method and then set a timer that will capture the view's pixels > a fraction of a second later. (You'd want a timer for coalescing purposes, > since there are likely to be multiple calls in a short time interval.) > > The reason I say this is naive is because UIWebView almost certainly has a > whole tree of views inside it that do the actual drawing, so the actual > -drawRect: calls are probably going to those instead. But you could give this > a try and see if you get anything useful. > > —Jens > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > 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: > https://lists.apple.com/mailman/options/cocoa-dev/admin.szatmari.net%40gmail.com > > This email sent to admin.szatmari....@gmail.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com