Initial commit

Examples/Example-macOS/MountainsViewController.swift

@@ -0,0 +1,81 @@
+import AppKit
+import DiffableDataSources
+
+final class MountainsViewController: NSViewController {
+    enum Section {
+        case main
+    }
+
+    struct Mountain: Hashable {
+        var name: String
+
+        func contains(_ filter: String) -> Bool {
+            guard !filter.isEmpty else {
+                return true
+            }
+
+            let lowercasedFilter = filter.lowercased()
+            return name.lowercased().contains(lowercasedFilter)
+        }
+    }
+
+    @IBOutlet private var searchField: NSSearchField!
+    @IBOutlet private var collectionView: NSCollectionView!
+
+    private lazy var dataSource = CocoaCollectionViewDiffableDataSource<Section, Mountain>(collectionView: collectionView) { collectionView, indexPath, mountain in
+        let item = collectionView.makeItem(withIdentifier: LabelItem.itemIdentifier, for: indexPath) as! LabelItem
+        item.label.stringValue = mountain.name
+        return item
+    }
+
+    private let allMountains: [Mountain] = mountainsRawData.components(separatedBy: .newlines).map { line in
+        let name = line.components(separatedBy: ",")[0]
+        return Mountain(name: name)
+    }
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        title = "Mountains Search"
+
+        collectionView.delegate = self
+        collectionView.register(LabelItem.self, forItemWithIdentifier: LabelItem.itemIdentifier)
+
+        search(filter: "")
+    }
+
+    func search(filter: String) {
+        let mountains = allMountains.lazy
+            .filter { $0.contains(filter) }
+            .sorted { $0.name < $1.name }
+
+        let snapshot = DiffableDataSourceSnapshot<Section, Mountain>()
+        snapshot.appendSections([.main])
+        snapshot.appendItems(mountains)
+        dataSource.apply(snapshot)
+    }
+
+    @IBAction func searchFieldDidChangeText(_ sender: NSSearchField) {
+        search(filter: sender.stringValue)
+    }
+}
+
+extension MountainsViewController: NSCollectionViewDelegateFlowLayout {
+    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
+        return 10
+    }
+
+    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, insetForSectionAt section: Int) -> NSEdgeInsets {
+        return NSEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
+    }
+
+    func collectionView(_ collectionView: NSCollectionView, layout collectionViewLayout: NSCollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> NSSize {
+        let column = 3
+        let width = (collectionView.bounds.width - 10 * CGFloat(column + 1)) / CGFloat(column)
+        return CGSize(width: width, height: 44)
+    }
+}