On Wed, Sep 8, 2010 at 11:11 AM, Keith Blount <keithblo...@yahoo.com> wrote: > Hello, > > I have an NSOutlineView with variable row heights, as determined in > my -outlineView:heightOfRowByItem: delegate method. This has always seemed to > work fine, and the code of this delegate method hasn't changed much in the > past > three years, but I have had a user report a case whereby his outline view > appeared completely blank and this message appeared on the console: > > NSTableView/NSOutlineView variable row height code has detected re-entry. > Avoiding a crash.... > > After restarting the program, he hasn't seen the problem since, so I haven't > been able to reproduce it. But I did see it myself during testing once last > year > and then, too, I wasn't able to reproduce it a second time. I've Googled for > this message and can only find a couple of other posts referencing it, with no > solution. One problem is that I don't know exactly what the message means by > "re-entry", so I'm not sure whether the problem is with the variable row > height > code itself (which seems fine), or because the row height code is somehow > getting called twice during layout, or something else entirely. I've gone > through the code but can find no obvious culprit (which is probably not > surprising given the rarity of the error). > > Has anybody else seen this error, or does anybody know what it means?
Essentially, it means just what it says. Something has called into the code responsible for recording the row heights for a table view, while that same code was already running. Some potential causes: - Recursion: Your -tableView:heightOfRow: delegate method is doing something that is calling -reloadData, or -noteHeightOfRowsWithIndexesChanged: (or something else that causes recalculation of row heights) - Concurrency: You're accessing the table, its delegate, or its data source from multiple threads. -- Clark S. Cox III clarkc...@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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
