AnyOutlineView

An NSOutlineView that actually works with Any, i.e. w/ structs and enums.

NSOutlineView only works w/ AnyObjects, because it uses identity to maintain its internal state. I.e. the API's Any parameters are incorrectly mapped to Swift as Any. They actually have to be AnyObjects for all but the most static outline view.

This subclass works around that by maintaining an object tree for the new AnyOutlineViewDataSource. To make this work, that datasource needs to be able to give the items an "identity".

This view doesn't come for free, it essentially has to mirror the whole data provided by the anyDataSource. It tries to do lookups lazily though.

Example

Model

enumSection:String,CaseIterable{case dropbox ="Dropbox"case airdrop ="AirDrop"case applications ="Applications"case desktop ="Desktop"varitems:[String]{switchself{case.dropbox:return["Public","Documents","Other"]case.airdrop:return["MacPro2020","iMac Blueberry"]case.applications:return["Diagram.app","FrameMaker.app","ProjectBuilder.app"]case.desktop:return["Kaffee","Kuchen","Krümel"]}}}

AnyOutlineViewDataSource

extensionAppDelegate:AnyOutlineViewDataSource{func outlineView(_ outlineView:AnyOutlineView,
numberOfChildrenOfItem item:Any?)->Int{switch item {case.none:returnSection.allCases.count // root
caseletsection as Section:return section.items.count
default:return0}}func outlineView(_ outlineView:AnyOutlineView,
child index:Int, ofItem item:Any?)->Any{switch item {case.none:returnSection.allCases[index]caseletsection as Section:return section.items[index]default:fatalError("unexpected item: \(item asAny)")}}func outlineView(_ outlineView:AnyOutlineView, isItemExpandable item:Any)->Bool{return item is Section}}

AnyOutlineViewDelegate

extensionAppDelegate:AnyOutlineViewDelegate{enumCellID{staticletheader=NSUserInterfaceItemIdentifier(rawValue:"HeaderCell")staticletdata=NSUserInterfaceItemIdentifier(rawValue:"DataCell")}func outlineView(_ outlineView:AnyOutlineView,
viewFor tableColumn:NSTableColumn?, item:Any)->NSView?{letcell:NSTableCellViewiflet section = item as?Section{
cell = outlineView.makeView(withIdentifier:CellID.header, owner:nil)as!NSTableCellView
cell.textField?.stringValue = section.rawValue
}else{
cell = outlineView.makeView(withIdentifier:CellID.data, owner:nil)as!NSTableCellView
cell.textField?.stringValue =String(describing: item)}return cell
}}

Who

Brought to you by The Always Right Institute and ZeeZide. We like feedback, GitHub stars, cool contract work, presumably any form of praise you can think of.