Add option to pass custom array to view switcher

Sources/Core/View/ViewSwitcher.swift

@@ -6,21 +6,25 @@
 //
 
 import CAdw
+import LevenshteinTransformations
 
-/// A picker used for indicating multiple views.
-///
-/// It normally controls a `ViewStack` (e.g. via `switch` statements).
+/// The view switcher widget.
 public struct ViewSwitcher<Element>: AdwaitaWidget where Element: ViewSwitcherOption {
 
     /// The selected element.
-    @Binding var selection: Element
+    @Binding var selectedElement: Element
+    /// The elements.
+    var elements: [Element]
     /// Whether the wide style is used, that means the icons and titles are on the same line.
     var wide = false
 
     /// Initialize a view switcher.
-    /// - Parameter selection: The selected element.
-    public init(selection: Binding<Element>) {
-        self._selection = selection
+    /// - Parameters:
+    ///     - elements: The elements.
+    ///     - selectedElement: The selected element.
+    public init(_ elements: [Element], selectedElement: Binding<Element>) {
+        self._selectedElement = selectedElement
+        self.elements = elements
     }
 
     /// The view storage.
@@ -35,7 +39,7 @@ public struct ViewSwitcher<Element>: AdwaitaWidget where Element: ViewSwitcherOp
         let switcher = ViewStorage(adw_view_switcher_new()?.opaque())
         let stack = ViewStorage(adw_view_stack_new()?.opaque())
         adw_view_switcher_set_stack(switcher.opaquePointer, stack.opaquePointer)
-        for option in Element.allCases {
+        for option in elements {
             adw_view_stack_add_titled_with_icon(
                 stack.opaquePointer,
                 gtk_label_new(""),
@@ -71,7 +75,7 @@ public struct ViewSwitcher<Element>: AdwaitaWidget where Element: ViewSwitcherOp
         stack?.notify(name: "visible-child") {
             if let title = adw_view_stack_get_visible_child_name(stack?.opaquePointer),
             let option = Element(title: .init(cString: title)) {
-                selection = option
+                selectedElement = option
             }
         }
         if (switcher.previousState as? Self)?.wide != wide {
@@ -80,9 +84,9 @@ public struct ViewSwitcher<Element>: AdwaitaWidget where Element: ViewSwitcherOp
                 wide ? ADW_VIEW_SWITCHER_POLICY_WIDE : ADW_VIEW_SWITCHER_POLICY_NARROW
             )
         }
-        if (switcher.previousState as? Self)?.selection.title != selection.title {
+        if (switcher.previousState as? Self)?.selectedElement.title != selectedElement.title {
             let stack = adw_view_switcher_get_stack(switcher.opaquePointer)
-            adw_view_stack_set_visible_child_name(stack, selection.title)
+            adw_view_stack_set_visible_child_name(stack, selectedElement.title)
         }
         switcher.previousState = self
     }
@@ -98,8 +102,19 @@ public struct ViewSwitcher<Element>: AdwaitaWidget where Element: ViewSwitcherOp
 
 }
 
+extension ViewSwitcher where Element: CaseIterable {
+
+    /// Initialize a view switcher.
+    /// - Parameter selectedElement: The selected element.
+    public init(selectedElement: Binding<Element>) {
+        self._selectedElement = selectedElement
+        self.elements = .init(Element.allCases)
+    }
+
+}
+
 /// The protocol an element type for view switcher has to conform to.
-public protocol ViewSwitcherOption: CaseIterable {
+public protocol ViewSwitcherOption {
 
     /// The title displayed in the switcher and used for identification.
     var title: String { get }

Sources/Demo/ViewSwitcherDemo.swift

@@ -57,14 +57,14 @@ struct ViewSwitcherDemo: View {
         var toolbar: AnyView {
             HeaderBar(titleButtons: !bottom) { } end: { }
                 .headerBarTitle {
-                    ViewSwitcher(selection: $selection)
+                    ViewSwitcher(selectedElement: $selection)
                         .wideDesign(!bottom)
                 }
         }
 
     }
 
-    enum ViewSwitcherView: String, ViewSwitcherOption {
+    enum ViewSwitcherView: String, ViewSwitcherOption, CaseIterable {
 
         case albums
         case artists