Add stretchy menus

Reader.xcodeproj/project.pbxproj

@@ -48,6 +48,7 @@
 		D6E24371278BE1250005E546 /* HTMLEntities in Frameworks */ = {isa = PBXBuildFile; productRef = D6E24370278BE1250005E546 /* HTMLEntities */; };
 		D6E24373278BE2B80005E546 /* read.css in Resources */ = {isa = PBXBuildFile; fileRef = D6E24372278BE2B80005E546 /* read.css */; };
 		D6EB531D278C89C300AD2E61 /* AppNavigationController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6EB531C278C89C300AD2E61 /* AppNavigationController.swift */; };
+		D6EB531F278E4A7500AD2E61 /* StretchyMenuInteraction.swift in Sources */ = {isa = PBXBuildFile; fileRef = D6EB531E278E4A7500AD2E61 /* StretchyMenuInteraction.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -131,6 +132,7 @@
 		D6E2436D278BD8160005E546 /* ReadViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ReadViewController.swift; sourceTree = "<group>"; };
 		D6E24372278BE2B80005E546 /* read.css */ = {isa = PBXFileReference; lastKnownFileType = text.css; path = read.css; sourceTree = "<group>"; };
 		D6EB531C278C89C300AD2E61 /* AppNavigationController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppNavigationController.swift; sourceTree = "<group>"; };
+		D6EB531E278E4A7500AD2E61 /* StretchyMenuInteraction.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StretchyMenuInteraction.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -242,6 +244,7 @@
 				D65B18B527504920004A9448 /* FervorController.swift */,
 				D65B18BD275051A1004A9448 /* LocalData.swift */,
 				D6E24368278BABB40005E546 /* UIColor+App.swift */,
+				D6EB531E278E4A7500AD2E61 /* StretchyMenuInteraction.swift */,
 				D6A8A33527766E9300CCEC72 /* CoreData */,
 				D65B18AF2750468B004A9448 /* Screens */,
 				D6C687F7272CD27700874C10 /* Assets.xcassets */,
@@ -499,6 +502,7 @@
 				D6E24360278B97240005E546 /* Group+CoreDataProperties.swift in Sources */,
 				D6E2434C278B456A0005E546 /* ItemsViewController.swift in Sources */,
 				D6E2435E278B97240005E546 /* Item+CoreDataProperties.swift in Sources */,
+				D6EB531F278E4A7500AD2E61 /* StretchyMenuInteraction.swift in Sources */,
 				D6E24358278B96E40005E546 /* Feed+CoreDataProperties.swift in Sources */,
 				D65B18BE275051A1004A9448 /* LocalData.swift in Sources */,
 				D65B18B22750469D004A9448 /* LoginViewController.swift in Sources */,

Reader/Screens/AppNavigationController.swift

@@ -10,6 +10,8 @@ import UIKit
 class AppNavigationController: UINavigationController, UINavigationControllerDelegate {
     
     private var statusBarBlockingView: UIView!
+    
+    static let panRecognizerName = "AppNavPanRecognizer"
 
     override func viewDidLoad() {
         super.viewDidLoad()
@@ -21,6 +23,7 @@ class AppNavigationController: UINavigationController, UINavigationControllerDel
         interactivePopGestureRecognizer?.isEnabled = false
         let recognizer = UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognized))
         recognizer.allowedScrollTypesMask = .continuous
+        recognizer.name = AppNavigationController.panRecognizerName
         view.addGestureRecognizer(recognizer)
         
         isNavigationBarHidden = true

Reader/Screens/Home/HomeViewController.swift

@@ -33,6 +33,10 @@ class HomeViewController: UIViewController {
         // todo: account info
         title = "Reader"
         
+        view.addInteraction(StretchyMenuInteraction(delegate: self))
+        
+        view.backgroundColor = .appBackground
+        
         var config = UICollectionLayoutListConfiguration(appearance: .grouped)
         config.headerMode = .supplementary
         config.backgroundColor = .appBackground
@@ -236,3 +240,19 @@ extension HomeViewController: UICollectionViewDelegate {
         }
     }
 }
+
+extension HomeViewController: StretchyMenuInteractionDelegate {
+    func stretchyMenuTitle() -> String? {
+        return "Switch Accounts"
+    }
+    func stretchyMenuItems() -> [StretchyMenuItem] {
+        return [
+            StretchyMenuItem(title: "foo", subtitle: "bar", action: {
+                print("foo")
+            }),
+            StretchyMenuItem(title: "baz", subtitle: "qux", action: {
+                print("baz")
+            }),
+        ]
+    }
+}

Reader/Screens/Read/ReadViewController.swift

@@ -47,6 +47,7 @@ class ReadViewController: UIViewController {
         navigationItem.largeTitleDisplayMode = .never
         
         view.backgroundColor = .appBackground
+        view.addInteraction(StretchyMenuInteraction(delegate: self))
         
         let webView = WKWebView()
         webView.translatesAutoresizingMaskIntoConstraints = false
@@ -167,3 +168,26 @@ extension ReadViewController: WKUIDelegate {
         }
     }
 }
+
+extension ReadViewController: StretchyMenuInteractionDelegate {
+    func stretchyMenuTitle() -> String? {
+        return nil
+    }
+    
+    func stretchyMenuItems() -> [StretchyMenuItem] {
+        guard let url = item.url else {
+            return []
+        }
+        return [
+            StretchyMenuItem(title: "Open in Safari", subtitle: nil, action: { [unowned self] in
+                self.present(createSafariVC(url: url), animated: true)
+            }),
+            StretchyMenuItem(title: "Share", subtitle: nil, action: { [unowned self] in
+                self.present(UIActivityViewController(activityItems: [url], applicationActivities: nil), animated: true)
+            }),
+            StretchyMenuItem(title: item.read ? "Mark as Unread" : "Mark as Read", subtitle: nil, action: { [unowned self] in
+                item.read = !item.read
+            }),
+        ]
+    }
+}

Reader/StretchyMenuInteraction.swift

@@ -0,0 +1,405 @@
+//
+//  StretchyMenuInteraction.swift
+//  Reader
+//
+//  Created by Shadowfacts on 1/11/22.
+//
+
+import UIKit
+
+struct StretchyMenuItem {
+    let title: String
+    let subtitle: String?
+    let action: () -> Void
+}
+
+protocol StretchyMenuInteractionDelegate: AnyObject {
+    func stretchyMenuTitle() -> String?
+    func stretchyMenuItems() -> [StretchyMenuItem]
+}
+
+class StretchyMenuInteraction: NSObject, UIInteraction {
+    
+    weak var delegate: StretchyMenuInteractionDelegate?
+    
+    private(set) weak var view: UIView? = nil
+    
+    private let menuHintView = MenuHintView()
+    fileprivate let feedbackGenerator = UIImpactFeedbackGenerator(style: .medium)
+    private var snapshot: UIView?
+    private var menuView: MenuView?
+    
+    private let menuOpenThreshold: CGFloat = 100
+    
+    fileprivate var isShowingMenu = false
+    
+    init(delegate: StretchyMenuInteractionDelegate) {
+        self.delegate = delegate
+        
+        menuHintView.translatesAutoresizingMaskIntoConstraints = false
+    }
+    
+    func willMove(to view: UIView?) {
+        if self.view != nil {
+            fatalError("removing StretchyMenuInteraction from view is unsupported")
+        }
+    }
+    
+    func didMove(to view: UIView?) {
+        self.view = view
+        
+        guard let view = view else {
+            return
+        }
+
+        let panRecognizer = UIPanGestureRecognizer(target: self, action: #selector(panGestureRecognized))
+        panRecognizer.delegate = self
+        view.addGestureRecognizer(panRecognizer)
+        
+    }
+    
+    private var prevTranslation: CGFloat = 0
+    
+    @objc private func panGestureRecognized(_ recognizer: UIPanGestureRecognizer) {
+        guard let view = view,
+              !isShowingMenu,
+              let delegate = delegate else {
+            return
+        }
+        
+        let prevTranslation = self.prevTranslation
+        let translation = recognizer.translation(in: view)
+        self.prevTranslation = translation.x
+
+        switch recognizer.state {
+        case .began:
+            snapshot = view.snapshotView(afterScreenUpdates: false)
+            let effectiveTranslation = 0.5 * max(0, -translation.x)
+            snapshot!.transform = CGAffineTransform(translationX: -effectiveTranslation, y: 0)
+            view.addSubview(snapshot!)
+            view.insertSubview(menuHintView, belowSubview: snapshot!)
+            menuHintView.backgroundColor = view.backgroundColor
+            menuHintView.frame = CGRect(x: view.bounds.width - effectiveTranslation, y: 0, width: effectiveTranslation, height: view.bounds.height)
+            menuHintView.updateForProgress(0, animate: false)
+            feedbackGenerator.prepare()
+            
+        case .changed:
+            let effectiveTranslation = 0.5 * max(0, -translation.x)
+            snapshot!.transform = CGAffineTransform(translationX: -effectiveTranslation, y: 0)
+            if -prevTranslation < menuOpenThreshold && -translation.x >= menuOpenThreshold {
+                feedbackGenerator.impactOccurred()
+            }
+            menuHintView.frame = CGRect(x: view.bounds.width - effectiveTranslation, y: 0, width: effectiveTranslation, height: view.bounds.height)
+            menuHintView.updateForProgress(-translation.x / menuOpenThreshold, animate: true)
+            
+        case .ended:
+            UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseInOut) {
+                self.snapshot!.transform = .identity
+            } completion: { _ in
+                self.snapshot!.removeFromSuperview()
+                self.menuHintView.removeFromSuperview()
+            }
+
+            
+            if -translation.x > menuOpenThreshold {
+                guard let rootView = view.window?.rootViewController?.view else {
+                    return
+                }
+                let menuView = MenuView(title: delegate.stretchyMenuTitle(), items: delegate.stretchyMenuItems(), owner: self)
+                self.menuView = menuView
+                menuView.translatesAutoresizingMaskIntoConstraints = false
+                menuView.layer.zPosition = 102
+                rootView.addSubview(menuView)
+                NSLayoutConstraint.activate([
+                    menuView.leadingAnchor.constraint(equalTo: rootView.leadingAnchor),
+                    menuView.trailingAnchor.constraint(equalTo: rootView.trailingAnchor),
+                    menuView.topAnchor.constraint(equalTo: rootView.topAnchor),
+                    menuView.bottomAnchor.constraint(equalTo: rootView.bottomAnchor),
+                ])
+                rootView.layoutIfNeeded()
+                menuView.animateIn()
+                
+                isShowingMenu = true
+                feedbackGenerator.prepare()
+            }
+            
+        default:
+            break
+        }
+    }
+    
+    func hideMenu(completion: (() -> Void)? = nil) {
+        guard let menuView = menuView else {
+            return
+        }
+
+        menuView.animateOut() {
+            menuView.removeFromSuperview()
+            self.isShowingMenu = false
+            completion?()
+        }
+    }
+}
+
+extension StretchyMenuInteraction: UIGestureRecognizerDelegate {
+    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+        return otherGestureRecognizer.name == AppNavigationController.panRecognizerName
+    }
+}
+
+private class MenuHintView: UIView {
+    private let pill = UIView()
+    private var progress: CGFloat = 0
+    
+    private var animator: UIViewPropertyAnimator?
+    
+    init() {
+        super.init(frame: .zero)
+        
+        pill.frame = CGRect(x: 0, y: 0, width: 5, height: 50)
+        pill.backgroundColor = .systemGray
+        pill.layer.cornerRadius = 2.5
+        addSubview(pill)
+        
+        pill.backgroundColor = .systemGray
+        pill.frame.size.height = 50
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        
+        let width: CGFloat = 5
+        pill.frame.origin.x = bounds.midX - width / 2
+        pill.frame.origin.y = bounds.midY - pill.frame.height / 2
+    }
+    
+    func updateForProgress(_ progress: CGFloat, animate: Bool) {
+        let oldCompleted = self.progress >= 1
+        let completed = progress >= 1
+        
+        self.progress = progress
+        
+        if oldCompleted != completed {
+            func updatePill() {
+                pill.backgroundColor = completed ? .tintColor : .systemGray
+                let height: CGFloat = completed ? 75 : 50
+                pill.frame.origin.y = bounds.midY - height / 2
+                pill.frame.size.height = height
+            }
+            
+            animator?.stopAnimation(true)
+            if animate {
+                animator = UIViewPropertyAnimator(duration: 0.5, dampingRatio: 0.5, animations: updatePill)
+                animator!.startAnimation()
+            } else {
+                updatePill()
+            }
+        }
+    }
+}
+
+private class MenuView: UIView {
+    
+    weak var owner: StretchyMenuInteraction?
+    
+    private let blurEffect = UIBlurEffect(style: .systemUltraThinMaterialDark)
+    private var blurView: UIView!
+    private let optionsStack = UIStackView()
+    
+    private let items: [StretchyMenuItem]
+    
+    init(title: String?, items: [StretchyMenuItem], owner: StretchyMenuInteraction) {
+        self.items = items
+        self.owner = owner
+        
+        super.init(frame: .zero)
+        
+        blurView = UIVisualEffectView(effect: blurEffect)
+        blurView.translatesAutoresizingMaskIntoConstraints = false
+        addSubview(blurView)
+        
+        optionsStack.axis = .vertical
+        optionsStack.alignment = .fill
+        optionsStack.spacing = 2
+        optionsStack.translatesAutoresizingMaskIntoConstraints = false
+        for item in items {
+            optionsStack.addArrangedSubview(MenuItemView(item: item, owner: owner))
+        }
+        addSubview(optionsStack)
+        
+        if let title = title {
+            let titleLabel = UILabel()
+            titleLabel.translatesAutoresizingMaskIntoConstraints = false
+            titleLabel.text = title
+            titleLabel.textAlignment = .right
+            titleLabel.font = .preferredFont(forTextStyle: .title1)
+            let vibrancyView = UIVisualEffectView(effect: UIVibrancyEffect(blurEffect: blurEffect, style: .label))
+            vibrancyView.contentView.addSubview(titleLabel)
+            optionsStack.insertArrangedSubview(vibrancyView, at: 0)
+            
+            NSLayoutConstraint.activate([
+                titleLabel.leadingAnchor.constraint(equalToSystemSpacingAfter: vibrancyView.contentView.leadingAnchor, multiplier: 1),
+                vibrancyView.contentView.trailingAnchor.constraint(equalToSystemSpacingAfter: titleLabel.trailingAnchor, multiplier: 1),
+                titleLabel.topAnchor.constraint(equalTo: vibrancyView.contentView.topAnchor),
+                titleLabel.bottomAnchor.constraint(equalTo: vibrancyView.contentView.bottomAnchor),
+            ])
+        }
+        
+        NSLayoutConstraint.activate([
+            blurView.leadingAnchor.constraint(equalTo: leadingAnchor),
+            blurView.trailingAnchor.constraint(equalTo: trailingAnchor),
+            blurView.topAnchor.constraint(equalTo: topAnchor),
+            blurView.bottomAnchor.constraint(equalTo: bottomAnchor),
+            
+            optionsStack.leadingAnchor.constraint(equalTo: leadingAnchor),
+            optionsStack.trailingAnchor.constraint(equalTo: trailingAnchor),
+            optionsStack.centerYAnchor.constraint(equalTo: centerYAnchor),
+        ])
+        
+        blurView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(blurTapped)))
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    func animateIn() {
+        blurView.layer.opacity = 0
+        let count = optionsStack.arrangedSubviews.count
+        for (index, item) in optionsStack.arrangedSubviews.enumerated() {
+            let multiplier = (1 + CGFloat(index) * 1 / CGFloat(count - 1))
+            item.transform = CGAffineTransform(translationX: bounds.width * multiplier, y: 0)
+        }
+        
+        UIView.animate(withDuration: 0.35, delay: 0, options: .curveEaseInOut) {
+            self.blurView.layer.opacity = 1
+            for item in self.optionsStack.arrangedSubviews {
+                item.transform = .identity
+            }
+        }
+    }
+    
+    func animateOut(completion: @escaping () -> Void) {
+        UIView.animate(withDuration: 0.35, delay: 0, options: .curveEaseInOut) {
+            self.blurView.layer.opacity = 0
+            let count = self.optionsStack.arrangedSubviews.count
+            for (index, item) in self.optionsStack.arrangedSubviews.enumerated() {
+                let multiplier = (1 + CGFloat(index) * 1 / CGFloat(count - 1))
+                item.transform = CGAffineTransform(translationX: self.bounds.width * -multiplier, y: 0)
+            }
+        } completion: { _ in
+            completion()
+        }
+    }
+    
+    @objc private func blurTapped() {
+        owner?.hideMenu()
+    }
+    
+}
+
+private class MenuItemView: UIView {
+    weak var owner: StretchyMenuInteraction?
+    
+    private let item: StretchyMenuItem
+    
+    init(item: StretchyMenuItem, owner: StretchyMenuInteraction) {
+        self.item = item
+        self.owner = owner
+        
+        super.init(frame: .zero)
+        
+        backgroundColor = .appBackground
+        
+        let titleLabel = UILabel()
+        titleLabel.translatesAutoresizingMaskIntoConstraints = false
+        titleLabel.text = item.title
+        titleLabel.textColor = .tintColor
+        titleLabel.textAlignment = .right
+        titleLabel.font = .preferredFont(forTextStyle: .title2)
+        addSubview(titleLabel)
+        
+        NSLayoutConstraint.activate([
+            titleLabel.topAnchor.constraint(equalTo: topAnchor, constant: 4),
+            titleLabel.leadingAnchor.constraint(equalToSystemSpacingAfter: leadingAnchor, multiplier: 1),
+            trailingAnchor.constraint(equalToSystemSpacingAfter: titleLabel.trailingAnchor, multiplier: 1),
+            
+            heightAnchor.constraint(greaterThanOrEqualToConstant: 44),
+        ])
+        
+        if let subtitle = item.subtitle {
+            let subtitleLabel = UILabel()
+            subtitleLabel.translatesAutoresizingMaskIntoConstraints = false
+            subtitleLabel.text = subtitle
+            subtitleLabel.textColor = .secondaryLabel
+            subtitleLabel.textAlignment = .right
+            addSubview(subtitleLabel)
+            NSLayoutConstraint.activate([
+                subtitleLabel.leadingAnchor.constraint(equalToSystemSpacingAfter: leadingAnchor, multiplier: 1),
+                trailingAnchor.constraint(equalToSystemSpacingAfter: subtitleLabel.trailingAnchor, multiplier: 1),
+                subtitleLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor),
+                bottomAnchor.constraint(equalTo: subtitleLabel.bottomAnchor, constant: 4),
+            ])
+        } else {
+            NSLayoutConstraint.activate([
+                bottomAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 4),
+            ])
+        }
+        
+        addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(itemTapped)))
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    @objc private func itemTapped() {
+        owner?.feedbackGenerator.impactOccurred()
+        
+        UIView.animateKeyframes(withDuration: 0.15, delay: 0, options: []) {
+            UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.5) {
+                self.backgroundColor = .appSecondaryBackground
+            }
+            UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 0.5) {
+                self.backgroundColor = .appBackground
+            }
+        } completion: { _ in
+            self.owner?.hideMenu() {
+                self.item.action()
+            }
+        }
+    }
+    
+    func addBorders(top: Bool, bottom: Bool) {
+        if top {
+            let view = UIView()
+            view.translatesAutoresizingMaskIntoConstraints = false
+            view.backgroundColor = .systemGray
+            addSubview(view)
+            NSLayoutConstraint.activate([
+                view.heightAnchor.constraint(equalToConstant: 1),
+                view.topAnchor.constraint(equalTo: topAnchor),
+                view.leadingAnchor.constraint(equalTo: leadingAnchor),
+                view.trailingAnchor.constraint(equalTo: trailingAnchor),
+            ])
+        }
+        
+        if bottom {
+            let view = UIView()
+            view.translatesAutoresizingMaskIntoConstraints = false
+            view.backgroundColor = .systemGray
+            addSubview(view)
+            NSLayoutConstraint.activate([
+                view.heightAnchor.constraint(equalToConstant: 1),
+                view.bottomAnchor.constraint(equalTo: bottomAnchor),
+                view.leadingAnchor.constraint(equalTo: leadingAnchor),
+                view.trailingAnchor.constraint(equalTo: trailingAnchor),
+            ])
+        }
+    }
+    
+}

Reader/UIColor+App.swift

@@ -20,6 +20,17 @@ extension UIColor {
         }
     }
     
+    static let appSecondaryBackground = UIColor { traitCollection in
+        switch traitCollection.userInterfaceStyle {
+        case .dark:
+            return UIColor(white: 0.2, alpha: 1)
+        case .unspecified, .light:
+            fallthrough
+        @unknown default:
+            return UIColor(white: 0.8, alpha: 1)
+        }
+    }
+    
     static let appCellHighlightBackground = UIColor { traitCollection in
         switch traitCollection.userInterfaceStyle {
         case .dark: