Re-add back/forwards context menus

Gemini-iOS/ToolbarView.swift

@@ -53,6 +53,11 @@ class ToolbarView: UIView {
         backButton.setImage(UIImage(systemName: "arrow.left", withConfiguration: symbolConfig), for: .normal)
         backButton.accessibilityLabel = "Back"
         backButton.isPointerInteractionEnabled = true
+        // fallback for when UIButton.menu isn't available
+        if #available(iOS 14.0, *) {
+        } else {
+            backButton.addInteraction(UIContextMenuInteraction(delegate: self))
+        }
         
         forwardsButton = UIButton()
         forwardsButton.addTarget(navigator, action: #selector(NavigationManager.goForward), for: .touchUpInside)
@@ -60,6 +65,10 @@ class ToolbarView: UIView {
         forwardsButton.setImage(UIImage(systemName: "arrow.right", withConfiguration: symbolConfig), for: .normal)
         forwardsButton.accessibilityLabel = "Forward"
         forwardsButton.isPointerInteractionEnabled = true
+        if #available(iOS 14.0, *) {
+        } else {
+            forwardsButton.addInteraction(UIContextMenuInteraction(delegate: self))
+        }
         
         reloadButton = UIButton()
         reloadButton.addTarget(navigator, action: #selector(NavigationManager.reload), for: .touchUpInside)
@@ -105,10 +114,11 @@ class ToolbarView: UIView {
             stack.bottomAnchor.constraint(equalTo: safeAreaLayoutGuide.bottomAnchor),
         ])
         
+        updateNavigationButtons()
+        
         navigator.navigationOperation
             .sink { (_) in
-                self.backButton.isEnabled = navigator.backStack.count > 0
+                self.updateNavigationButtons()
-                self.forwardsButton.isEnabled = navigator.forwardStack.count > 0
             }
             .store(in: &cancellables)
     }
@@ -123,6 +133,39 @@ class ToolbarView: UIView {
         border.backgroundColor = UIColor(white: traitCollection.userInterfaceStyle == .dark ? 0.25 : 0.75, alpha: 1)
     }
     
+    private func urlForDisplay(_ url: URL) -> String {
+        var str = url.host!
+        if let port = url.port,
+           url.scheme != "gemini" || port != 1965 {
+            str += ":\(port)"
+        }
+        str += url.path
+        return str
+    }
+    
+    private func updateNavigationButtons() {
+        backButton.isEnabled = navigator.backStack.count > 0
+        forwardsButton.isEnabled = navigator.forwardStack.count > 0
+        
+        if #available(iOS 14.0, *) {
+            let back = navigator.backStack.suffix(5).enumerated().reversed().map { (index, url) -> UIAction in
+                let backCount = min(5, navigator.backStack.count) - index
+                return UIAction(title: urlForDisplay(url)) { (_) in
+                    self.navigator.back(count: backCount)
+                }
+            }
+            backButton.menu = UIMenu(children: back)
+
+            let forward = navigator.forwardStack.prefix(5).enumerated().map { (index, url) -> UIAction in
+                let forwardCount = index + 1
+                return UIAction(title: urlForDisplay(url)) { (_) in
+                    self.navigator.forward(count: forwardCount)
+                }
+            }
+            forwardsButton.menu = UIMenu(children: forward)
+        }
+    }
+    
     @objc private func tableOfContentsPressed() {
         showTableOfContents?()
     }
@@ -136,3 +179,30 @@ class ToolbarView: UIView {
     }
 
 }
+
+extension ToolbarView: UIContextMenuInteractionDelegate {
+    func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
+        if interaction.view == backButton {
+            return UIContextMenuConfiguration(identifier: nil, previewProvider: { nil }) { (_) -> UIMenu? in
+                let children = self.navigator.backStack.suffix(5).enumerated().map { (index, url) in
+                    UIAction(title: self.urlForDisplay(url)) { (_) in
+                        self.navigator.back(count: min(5, self.navigator.backStack.count) - index)
+                    }
+                }
+                return UIMenu(title: "", image: nil, identifier: nil, options: [], children: children)
+            }
+        } else if interaction.view == forwardsButton {
+            return UIContextMenuConfiguration(identifier: nil, previewProvider: { nil }) { (_) -> UIMenu? in
+                let children = self.navigator.forwardStack.prefix(5).enumerated().map { (index, url) -> UIAction in
+                    let forwardCount = index + 1
+                    return UIAction(title: self.urlForDisplay(url)) { (_) in
+                        self.navigator.forward(count: forwardCount)
+                    }
+                }
+                return UIMenu(title: "", image: nil, identifier: nil, options: [], children: children)
+            }
+        } else {
+            return nil
+        }
+    }
+}