Add initial implementation for context menu interaction delegate

Sources/XCoordinator/CoordinatorContextMenuInteractionDelegate.swift

@@ -0,0 +1,81 @@
+//
+//  CoordinatorContextMenuInteractionDelegate.swift
+//  XCoordinator
+//
+//  Created by Paul Kraft on 13.02.20.
+//
+
+import UIKit
+
+@available(iOS 13.0, *)
+internal class CoordinatorContextMenuInteractionDelegate<TransitionType: TransitionProtocol>: NSObject, UIContextMenuInteractionDelegate {
+
+    // MARK: Stored properties
+
+    private let identifier: NSCopying?
+    private let transition: () -> TransitionType
+    private let menu: UIMenu?
+
+    private let rootViewController: TransitionType.RootViewController
+    private let completion: PresentationHandler?
+
+    // MARK: Initialization
+
+    internal init(
+        identifier: NSCopying?,
+        transition: @escaping () -> TransitionType,
+        rootViewController: TransitionType.RootViewController,
+        menu: UIMenu?,
+        completion: PresentationHandler?
+    ) {
+        self.identifier = identifier
+        self.transition = transition
+        self.menu = menu
+        self.rootViewController = rootViewController
+        self.completion = completion
+    }
+
+    // MARK: Methods
+
+    internal func contextMenuInteraction(
+        _ interaction: UIContextMenuInteraction,
+        configurationForMenuAtLocation location: CGPoint
+    ) -> UIContextMenuConfiguration? {
+        UIContextMenuConfiguration(
+            identifier: identifier,
+            previewProvider: { [weak self] in
+                self?.transition().presentables.last?.viewController
+            },
+            actionProvider:  { [weak self] _ in
+                self?.menu
+            }
+        )
+    }
+
+    internal func contextMenuInteraction(
+        _ interaction: UIContextMenuInteraction,
+        willDisplayMenuFor configuration: UIContextMenuConfiguration,
+        animator: UIContextMenuInteractionAnimating?
+    ) {
+        print(#function)
+    }
+
+    internal func contextMenuInteraction(
+        _ interaction: UIContextMenuInteraction,
+        willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration,
+        animator: UIContextMenuInteractionCommitAnimating
+    ) {
+        transition().perform(on: rootViewController,
+                             with: .default,
+                             completion: completion)
+    }
+
+    internal func contextMenuInteraction(
+        _ interaction: UIContextMenuInteraction,
+        willEndFor configuration: UIContextMenuConfiguration,
+        animator: UIContextMenuInteractionAnimating?
+    ) {
+        completion?()
+    }
+
+}

Sources/XCoordinator/Transition+Init.swift

@@ -274,4 +274,31 @@ extension Coordinator where Self: AnyObject {
         }
     }
 
+    ///
+    /// Use this method to create a UIContextMenuInteractionDelegate to generate a preview
+    /// from a given route and perform the route when the preview is tapped.
+    ///
+    /// - Parameters:
+    ///     - route: The route to be triggered when the preview has been selected.
+    ///     - menu: The menu to be shown alongside the preview.
+    ///
+    @available(iOS 13.0, *)
+    public func contextMenuInteractionDelegate(
+        for route: RouteType,
+        identifier: NSCopying? = nil,
+        menu: UIMenu? = nil,
+        completion: PresentationHandler? = nil
+    ) -> UIContextMenuInteractionDelegate {
+
+        CoordinatorContextMenuInteractionDelegate(
+            identifier: identifier,
+            transition: { [weak self] in
+                self?.prepareTransition(for: route) ?? .multiple()
+            },
+            rootViewController: rootViewController,
+            menu: menu,
+            completion: completion
+        )
+    }
+
 }