On Mar 14, 2017, at 18:26 , Daryle Walker <dary...@mac.com> wrote: > > You’d think that this would be a solved problem….
It sort of is. I think you can find a solution on stackoverflow.com <http://stackoverflow.com/> (which is where I got the idea from IIRC) but you have to wade through the out of date stuff to pick out a modern way of doing it. Here’s the code I came up with (for an outline view, table view should be similar): > func resizeListItem (_ listItem: RecentObjectValue, cell: > NSTableCellView, width: CGFloat, resizedRows: NSMutableIndexSet? = nil) > { > cell.objectValue = listItem > > cell.textField?.preferredMaxLayoutWidth = width - 2 > cell.needsUpdateConstraints = true > cell.layoutSubtreeIfNeeded () > > let rowHeight = cell.fittingSize.height > > guard listItem.rowHeight != rowHeight else { return } > > listItem.rowHeight = rowHeight > let row = recentsListView.row (forItem: listItem) > > guard row >= 0, let rows = resizedRows else { return } > > rows.add (row) > } The listItem parameter is a custom struct that contains the actual data displayed in the row (the data model of the outline view, in effect), but it also caches the row height. The resizedRows parameter just accumulates an optional set of changed heights for a subsequent “noteHeightOfRowsChanged”. The cell parameter is created once for measuring purposes, in viewDidLoad: > /* view controller instance variable */ headerCell = > recentsListView.make (withIdentifier: "HeaderCell", owner: self) as! > NSTableCellView > let headerConstraint = NSLayoutConstraint (item: headerCell, > attribute: .height, relatedBy: .greaterThanOrEqual, toItem: nil, attribute: > .notAnAttribute, multiplier: 1, constant: 17) > NSLayoutConstraint.activate ([headerConstraint]) The only other thing you need is a strategy for deciding when to recalculate the heights. When the column width changes, obviously, as well as for inserted rows, but there might be other cases as well. _______________________________________________ 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
