Support fast account switching with new sidebar

Tusker/Box.swift

@@ -9,10 +9,14 @@
 import Foundation
 
 @propertyWrapper
-class Box<Value> {
+final class Box<Value> {
     var wrappedValue: Value
     
     init(wrappedValue: Value) {
         self.wrappedValue = wrappedValue
     }
+    
+    var projectedValue: Box<Value> {
+        self
+    }
 }

Tusker/Screens/Fast Account Switcher/FastAccountSwitcherViewController.swift

@@ -11,6 +11,7 @@ import UserAccounts
 
 @MainActor
 protocol FastAccountSwitcherViewControllerDelegate: AnyObject {
+    func fastAccountSwitcherItemOrientation(_ fastAccountSwitcher: FastAccountSwitcherViewController) -> FastAccountSwitcherViewController.ItemOrientation
     func fastAccountSwitcherAddToViewHierarchy(_ fastAccountSwitcher: FastAccountSwitcherViewController)
     /// - Parameter point: In the coordinate space of the view to which the pan gesture recognizer is attached.
     func fastAccountSwitcher(_ fastAccountSwitcher: FastAccountSwitcherViewController, triggerZoneContains point: CGPoint) -> Bool
@@ -31,7 +32,7 @@ class FastAccountSwitcherViewController: UIViewController {
     #endif
     private var touchBeganFeedbackWorkItem: DispatchWorkItem?
     
-    var itemOrientation: ItemOrientation = .iconsTrailing
+    private var itemOrientation: ItemOrientation = .iconsTrailing
     
     init() {
         super.init(nibName: "FastAccountSwitcherViewController", bundle: .main)
@@ -60,6 +61,9 @@ class FastAccountSwitcherViewController: UIViewController {
     }
     
     func show() {
+        if let delegate {
+            itemOrientation = delegate.fastAccountSwitcherItemOrientation(self)
+        }
         createAccountViews()
         // add after creating account views so that the presenter can align based on them
         delegate?.fastAccountSwitcherAddToViewHierarchy(self)

Tusker/Screens/Main/AccountSwitchingContainerViewController.swift

@@ -39,7 +39,16 @@ class AccountSwitchingContainerViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
 
-        embedChild(root)
+        addChild(root)
+        root.view.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(root.view)
+        NSLayoutConstraint.activate([
+            root.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
+            root.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            root.view.topAnchor.constraint(equalTo: view.topAnchor),
+            root.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+        root.didMove(toParent: self)
     }
     
     override func didReceiveMemoryWarning() {

Tusker/Screens/Main/BaseMainTabBarViewController.swift

@@ -8,7 +8,7 @@
 
 import UIKit
 
-class BaseMainTabBarViewController: UITabBarController {
+class BaseMainTabBarViewController: UITabBarController, FastAccountSwitcherViewControllerDelegate {
     
     let mastodonController: MastodonController
     
@@ -115,11 +115,14 @@ class BaseMainTabBarViewController: UITabBarController {
     }
     #endif // !os(visionOS)
     
-}
+    // MARK: FastAccountSwitcherViewControllerDelegate
+    
+    func fastAccountSwitcherItemOrientation(_ fastAccountSwitcher: FastAccountSwitcherViewController) -> FastAccountSwitcherViewController.ItemOrientation {
+        return .iconsTrailing
+    }
     
-#if !os(visionOS)
-extension BaseMainTabBarViewController: FastAccountSwitcherViewControllerDelegate {
     func fastAccountSwitcherAddToViewHierarchy(_ fastAccountSwitcher: FastAccountSwitcherViewController) {
+        #if !os(visionOS)
         fastAccountSwitcher.view.translatesAutoresizingMaskIntoConstraints = false
         view.addSubview(fastAccountSwitcher.view)
         NSLayoutConstraint.activate([
@@ -134,17 +137,21 @@ extension BaseMainTabBarViewController: FastAccountSwitcherViewControllerDelegat
             fastAccountSwitcher.view.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
             fastAccountSwitcher.view.safeAreaLayoutGuide.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
         ])
+        #endif // !os(visionOS)
     }
     
     func fastAccountSwitcher(_ fastAccountSwitcher: FastAccountSwitcherViewController, triggerZoneContains point: CGPoint) -> Bool {
+        #if !os(visionOS)
         guard let myProfileButton = findMyProfileTabBarButton() else {
             return false
         }
         let locationInButton = myProfileButton.convert(point, from: tabBar)
         return myProfileButton.bounds.contains(locationInButton)
+        #else
+        return false
+        #endif // !os(visionOS)
     }
 }
-#endif // !os(visionOS)
 
 extension BaseMainTabBarViewController: TuskerNavigationDelegate {
     var apiController: MastodonController! { mastodonController }

Tusker/Screens/Main/MainSplitViewController.swift

@@ -93,7 +93,6 @@ class MainSplitViewController: UISplitViewController {
         if UIDevice.current.userInterfaceIdiom != .mac {
             let switcher = FastAccountSwitcherViewController()
             fastAccountSwitcher = switcher
-            switcher.itemOrientation = .iconsLeading
             switcher.view.translatesAutoresizingMaskIntoConstraints = false
             switcher.delegate = self
             // accessing .view unconditionally loads the view, which we don't want to happen
@@ -664,6 +663,10 @@ extension MainSplitViewController: BackgroundableViewController {
 }
 
 extension MainSplitViewController: FastAccountSwitcherViewControllerDelegate {
+    func fastAccountSwitcherItemOrientation(_ fastAccountSwitcher: FastAccountSwitcherViewController) -> FastAccountSwitcherViewController.ItemOrientation {
+        return .iconsLeading
+    }
+    
     func fastAccountSwitcherAddToViewHierarchy(_ fastAccountSwitcher: FastAccountSwitcherViewController) {
         view.addSubview(fastAccountSwitcher.view)
         let currentAccount = fastAccountSwitcher.accountViews.first(where: \.isCurrent)!
@@ -677,6 +680,7 @@ extension MainSplitViewController: FastAccountSwitcherViewControllerDelegate {
             fastAccountSwitcher.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
         ])
     }
+    
     func fastAccountSwitcher(_ fastAccountSwitcher: FastAccountSwitcherViewController, triggerZoneContains point: CGPoint) -> Bool {
         guard !isCollapsed,
               let cell = sidebar.myProfileCell() else {

Tusker/Screens/Main/NewMainTabBarViewController.swift

@@ -28,6 +28,8 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
     
     private var navigationStacks = [String: [UIViewController]]()
     private var isCompact: Bool?
+    @Box fileprivate var myProfileCell: UIView?
+    private var sidebarTapRecognizer: UITapGestureRecognizer?
 
     override func viewDidLoad() {
         super.viewDidLoad()
@@ -202,6 +204,17 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
         return nav
     }
     
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        
+        if sidebarTapRecognizer == nil,
+           let sidebarView = findSidebarView() {
+            sidebarTapRecognizer = UITapGestureRecognizer(target: self, action: #selector(sidebarTapped))
+            sidebarTapRecognizer!.cancelsTouchesInView = false
+            sidebarView.addGestureRecognizer(sidebarTapRecognizer!)
+        }
+    }
+    
     private func reloadLists(_ lists: [List]) {
         listsGroup.children = lists.map { list in
             UITab(title: list.title, image: UIImage(systemName: "list.bullet"), identifier: "list:\(list.id)") { [unowned self] _ in
@@ -214,6 +227,10 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
         compose(editing: nil)
     }
     
+    @objc private func sidebarTapped() {
+        fastAccountSwitcher?.hide()
+    }
+    
     fileprivate func updateViewControllerSafeAreaInsets(_ vc: UIViewController) {
         guard vc is MultiColumnNavigationController || (vc as? AdaptableNavigationController)?.current is MultiColumnNavigationController else {
             return
@@ -222,6 +239,57 @@ class NewMainTabBarViewController: BaseMainTabBarViewController {
         // The floating tab bar seems to always be 88pt tall, regardless of, e.g., Dynamic Type size.
         vc.additionalSafeAreaInsets = UIEdgeInsets(top: sidebar.isHidden ? 0 : -88, left: 0, bottom: 0, right: 0)
     }
+    
+    private func findSidebarView() -> UIView? {
+        var next = myProfileCell
+        while let cur = next {
+            if cur.superview?.superview === self.view {
+                return cur
+            } else {
+                next = cur.superview
+            }
+        }
+        return nil
+    }
+    
+    #if !os(visionOS)
+    override func fastAccountSwitcherItemOrientation(_ fastAccountSwitcher: FastAccountSwitcherViewController) -> FastAccountSwitcherViewController.ItemOrientation {
+        guard !sidebar.isHidden,
+              myProfileCell != nil else {
+            return super.fastAccountSwitcherItemOrientation(fastAccountSwitcher)
+        }
+        return .iconsLeading
+    }
+    
+    override func fastAccountSwitcherAddToViewHierarchy(_ fastAccountSwitcher: FastAccountSwitcherViewController) {
+        guard !sidebar.isHidden,
+              let myProfileCell else {
+            super.fastAccountSwitcherAddToViewHierarchy(fastAccountSwitcher)
+            return
+        }
+        
+        fastAccountSwitcher.view.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(fastAccountSwitcher.view)
+        
+        let currentAccount = fastAccountSwitcher.accountViews.first(where: \.isCurrent)!
+        NSLayoutConstraint.activate([
+            currentAccount.centerYAnchor.constraint(equalTo: myProfileCell.centerYAnchor),
+            
+            fastAccountSwitcher.view.leadingAnchor.constraint(equalTo: selectedTab!.viewController!.view.safeAreaLayoutGuide.leadingAnchor),
+            fastAccountSwitcher.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
+            fastAccountSwitcher.view.topAnchor.constraint(equalTo: view.topAnchor),
+            fastAccountSwitcher.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+        ])
+    }
+    
+    override func fastAccountSwitcher(_ fastAccountSwitcher: FastAccountSwitcherViewController, triggerZoneContains point: CGPoint) -> Bool {
+        guard !sidebar.isHidden,
+              myProfileCell != nil else {
+            return super.fastAccountSwitcher(fastAccountSwitcher, triggerZoneContains: point)
+        }
+        return true
+    }
+    #endif
 }
 
 @available(iOS 18.0, *)
@@ -303,6 +371,24 @@ extension NewMainTabBarViewController: UITabBarController.Sidebar.Delegate {
             vc.view.layoutIfNeeded()
         }
     }
+    
+    func tabBarController(_ tabBarController: UITabBarController, sidebar: UITabBarController.Sidebar, itemFor request: UITabSidebarItem.Request) -> UITabSidebarItem {
+        let item = UITabSidebarItem(request: request)
+        if case .tab(let tab) = request.content,
+           UIDevice.current.userInterfaceIdiom != .mac,
+           tab.identifier == Tab.myProfile.rawValue {
+            let indicator = FastAccountSwitcherIndicatorView()
+            // need to explicitly set the frame to get it vertically centered
+            indicator.frame = CGRect(origin: .zero, size: indicator.intrinsicContentSize)
+            item.accessories = [
+                .customView(configuration: .init(customView: indicator, placement: .trailing()))
+            ]
+            item.contentConfiguration = MyProfileContentConfiguration(wrapped: item.contentConfiguration, view: $myProfileCell) { [unowned self] in
+                $0.addGestureRecognizer(self.fastAccountSwitcher.createSwitcherGesture())
+            }
+        }
+        return item
+    }
 }
 
 @available(iOS 18.0, *)
@@ -393,3 +479,26 @@ extension NewMainTabBarViewController: AccountSwitchableViewController {
         #endif
     }
 }
+
+private struct MyProfileContentConfiguration: UIContentConfiguration {
+    let wrapped: any UIContentConfiguration
+    @Box var view: UIView?
+    let configureView: (UIView) -> Void
+    
+    init(wrapped: any UIContentConfiguration, view: Box<UIView?>, configureView: @escaping (UIView) -> Void) {
+        self.wrapped = wrapped
+        self._view = view
+        self.configureView = configureView
+    }
+    
+    func makeContentView() -> any UIView & UIContentView {
+        let view = wrapped.makeContentView()
+        self.view = view
+        configureView(view)
+        return view
+    }
+    
+    func updated(for state: any UIConfigurationState) -> Self {
+        return .init(wrapped: wrapped.updated(for: state), view: $view, configureView: configureView)
+    }
+}