all features implemented

DieHammer/Utilities/ViewUtils.swift

@@ -0,0 +1,33 @@
+//
+//  ViewUtiles.swift
+//  Bunch O' Dice
+//
+//  Created by Rory Hinnen on 22/6/12.
+//
+
+import Foundation
+import SwiftUI
+
+class SheetState<State>: ObservableObject {
+    @Published var isShowing = false
+    @Published var state: State? {
+        didSet { isShowing = state != nil }
+    }
+}
+
+class SettingsSheet: SheetState<SettingsSheet.State> {
+    enum State {
+        case settings, history
+    }
+}
+
+extension CaseIterable where Self: Equatable {
+    mutating func next() {
+        let allCases = Self.allCases
+        // just a sanity check, as the possibility of a enum case to not be
+        // present in `allCases` is quite low
+        guard let selfIndex = allCases.firstIndex(of: self) else { return }
+        let nextIndex = Self.allCases.index(after: selfIndex)
+        self = allCases[nextIndex == allCases.endIndex ? allCases.startIndex : nextIndex]
+    }
+}