Add support for menus

Sources/Core/Menu/MenuCollection.swift

@@ -56,7 +56,7 @@ public struct MenuCollection: MenuWidget, Wrapper {
     ///     - data: The widget data.
     ///     - menu:  The menu.
     /// - Returns: The view storage with the GMenu as the pointer.
-    public func getMenu(data: WidgetData, menu: NSMenu?) -> ViewStorage {
+    public func getMenu(data: WidgetData, menu: NSMenu? = nil) -> ViewStorage {
         let item = NSMenuItem()
         let menu = menu ?? .init()
         let storage = container(data: data.noModifiers, type: MenuContext.self)

Sources/Core/View/MenuWrapper.swift

@@ -0,0 +1,77 @@
+//
+//  MenuWrapper.swift
+//  MacBackend
+//
+//  Created by david-swift on 06.12.2024.
+//
+
+import AppKit
+
+/// Wrap a view to add a menu.
+public struct MenuWrapper: MacWidget {
+
+    /// Whether the menu is visible.
+    @Binding var isPresented: Bool
+    /// The content.
+    var content: Body
+    /// The menu.
+    var menu: Body
+
+    /// Initialize a menu wrapper.
+    /// - Parameters:
+    ///   - content: The view content.
+    ///   - isPresented: Whether the menu is visible.
+    ///   - menu: The menu.
+    public init(@ViewBuilder content: () -> Body, isPresented: Binding<Bool>, @ViewBuilder menu: () -> Body) {
+        self._isPresented = isPresented
+        self.content = content()
+        self.menu = menu()
+    }
+
+    /// The view storage.
+    /// - Parameters:
+    ///     - data: The widget data.
+    ///     - type: The type of the views.
+    /// - Returns: The view storage.
+    public func container<Data>(
+        data: WidgetData,
+        type: Data.Type
+    ) -> ViewStorage where Data: ViewRenderData {
+        let content = content.storage(data: data, type: type)
+        let menuPointer = NSMenu()
+        let menu = MenuCollection { self.menu }.getMenu(data: data, menu: menuPointer)
+        let storage = ViewStorage(content.pointer, content: [.mainContent: [content], "menu": [menu]])
+        storage.fields["menu"] = menuPointer
+        update(storage, data: data, updateProperties: true, type: type)
+        return storage
+    }
+
+    /// Update the stored content.
+    /// - Parameters:
+    ///     - storage: The storage to update.
+    ///     - data: The widget data.
+    ///     - updateProperties: Whether to update the properties.
+    ///     - type: The type of the views.
+    public func update<Data>(
+        _ storage: ViewStorage,
+        data: WidgetData,
+        updateProperties: Bool,
+        type: Data.Type
+    ) where Data: ViewRenderData {
+        if let content = storage.content[.mainContent]?.first {
+            self.content.updateStorage(content, data: data, updateProperties: updateProperties, type: type)
+        }
+        if let menu = storage.content["menu"]?.first {
+            MenuCollection { self.menu }
+                .updateStorage(menu, data: data, updateProperties: updateProperties, type: MenuContext.self)
+        }
+        if isPresented,
+           let menu = storage.fields["menu"] as? NSMenu,
+           let content = storage.content[.mainContent]?.first?.pointer as? NSView,
+           let currentEvent = NSApp.currentEvent {
+            NSMenu.popUpContextMenu(menu, with: currentEvent, for: content)
+            isPresented = false
+        }
+    }
+
+}

Sources/Demo/Demo.swift

@@ -24,6 +24,7 @@ struct Demo: App {
     @State private var elements: [Element] = [.init()]
     @State private var selectedElement: String?
     @State private var alert = false
+    @State private var menuPresented = false
 
     var scene: Scene {
         Window("Main", id: "main") {
@@ -39,7 +40,12 @@ struct Demo: App {
                         selectedElement = element.id
                     }
                     Button(alert.description) {
-                        alert = true
+                        menuPresented = true
+                    }
+                    .menu(isPresented: $menuPresented) {
+                        MenuButton(alert.description) {
+                            print("Hi")
+                        }
                     }
                 }
                 .alert("Hello", isPresented: $alert)

Sources/MacBackend/AnyView.swift

@@ -30,4 +30,13 @@ extension AnyView {
         PaddingView(padding: padding, edges: edges, child: self)
     }
 
+    /// A menu over the view.
+    /// - Parameters:
+    ///   - isPresented: Whether the menu is currently visible.
+    ///   - menu: The menu.
+    /// - Returns: The view.
+    public func menu(isPresented: Binding<Bool>, @ViewBuilder menu: @escaping () -> Body) -> Meta.AnyView {
+        MenuWrapper(content: { self }, isPresented: isPresented, menu: menu)
+    }
+
 }