On Sep 15, 2014, at 3:54 PM, Jerry Krinock <je...@ieee.org> wrote: > On 2014 Sep 15, at 12:47, Ken Thomases <k...@codeweavers.com> wrote: > >> In particular, from the docs for -[NSOutlineViewDelegate >> outlineView:sizeToFitWidthOfColumn:]: >> >> "By default, NSOutlineView iterates every row in the table, accesses a cell >> via preparedCellAtColumn:row:, and requests the cellSize to find the >> appropriate largest width to use. >> >> For accurate results and performance, it is recommended that this method is >> implemented when using large tables. By default, large tables use a monte >> carlo simulation instead of iterating every row.” > > Those two paragraphs don’t make much sense to me, Ken. For starters, when > does NSOutlineView “iterate every row”? I mean, this is a delegate method. > There is no default implementation.
NSOutlineView would iterate every row if the delegate does not implement this method and it needs to figure out how wide a column should be. > Further up, it says that this method is "Invoked to allow the delegate to > provide custom sizing behavior when a column’s resize divider is double > clicked.” I was never even aware of this “feature" :)) and had not > implemented this method. Just to test, I implemented it to return CGFloat > value 50.0. And, by golly, now when I double-click a column divider, in the > table header, the preceding column resizes to 50 points. > > I’m still thinking, but I can’t reckon any connection between this and > -outlineView:child:ofItem: being sent proactively instead of lazily. > Implementing it did not stop the “let’s get every row” craziness with > -outlineView:child:ofItem:. I had thought that the outline view wanted to know its ideal column width upon first showing, but apparently not. Regards, Ken _______________________________________________ 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
