Dactyloidae iOS initial commit

mobile/ios/Client/Frontend/AuthenticationManager/PagingPasscodeViewController.swift

@@ -0,0 +1,89 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+private let PaneSwipeDuration: TimeInterval = 0.3
+
+/// Base class for implementing a Passcode configuration screen with multiple 'panes'.
+class PagingPasscodeViewController: BasePasscodeViewController {
+    fileprivate lazy var pager: UIScrollView = {
+        let scrollView = UIScrollView()
+        scrollView.isPagingEnabled = true
+        scrollView.isUserInteractionEnabled = false
+        scrollView.showsHorizontalScrollIndicator = false
+        scrollView.showsVerticalScrollIndicator = false
+        return scrollView
+    }()
+
+    var panes = [PasscodePane]()
+    var currentPaneIndex: Int = 0
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        view.addSubview(pager)
+        panes.forEach { pager.addSubview($0) }
+        pager.snp.makeConstraints { make in
+            make.bottom.left.right.equalTo(self.view)
+            make.top.equalTo(self.topLayoutGuide.snp.bottom)
+        }
+    }
+
+    override func viewDidLayoutSubviews() {
+        super.viewDidLayoutSubviews()
+        panes.enumerated().forEach { index, pane in
+            pane.frame = CGRect(origin: CGPoint(x: CGFloat(index) * pager.frame.width, y: 0), size: pager.frame.size)
+        }
+        pager.contentSize = CGSize(width: CGFloat(panes.count) * pager.frame.width, height: pager.frame.height)
+        scrollToPaneAtIndex(currentPaneIndex)
+        if self.authenticationInfo?.isLocked() ?? false {
+            return
+        }
+        panes[currentPaneIndex].codeInputView.becomeFirstResponder()
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        self.view.endEditing(true)
+    }
+}
+
+extension PagingPasscodeViewController {
+    @discardableResult func scrollToNextAndSelect() -> PasscodePane {
+        scrollToNextPane()
+        panes[currentPaneIndex].codeInputView.becomeFirstResponder()
+        return panes[currentPaneIndex]
+    }
+
+    @discardableResult func scrollToPreviousAndSelect() -> PasscodePane {
+        scrollToPreviousPane()
+        panes[currentPaneIndex].codeInputView.becomeFirstResponder()
+        return panes[currentPaneIndex]
+    }
+
+    func resetAllInputFields() {
+        panes.forEach { $0.codeInputView.resetCode() }
+    }
+
+    func scrollToNextPane() {
+        guard (currentPaneIndex + 1) < panes.count else {
+            return
+        }
+        currentPaneIndex += 1
+        scrollToPaneAtIndex(currentPaneIndex)
+    }
+
+    func scrollToPreviousPane() {
+        guard (currentPaneIndex - 1) >= 0 else {
+            return
+        }
+        currentPaneIndex -= 1
+        scrollToPaneAtIndex(currentPaneIndex)
+    }
+
+    func scrollToPaneAtIndex(_ index: Int) {
+        UIView.animate(withDuration: PaneSwipeDuration, delay: 0, options: UIViewAnimationOptions(), animations: {
+            self.pager.contentOffset = CGPoint(x: CGFloat(self.currentPaneIndex) * self.pager.frame.width, y: 0)
+        }, completion: nil)
+    }
+}