Add Menu control

Author: colemancda

AndroidSwiftUICore/Sources/AndroidSwiftUICore/Primitives/Menu.swift

@@ -0,0 +1,48 @@
+//
+//  Menu.swift
+//  AndroidSwiftUICore
+//
+//  A button that presents a dropdown of actions. The content's buttons become
+//  the menu items; the interpreter shows them in a Compose DropdownMenu.
+//
+
+public struct Menu<Label: View, Content: View>: View {
+
+    internal let label: Label
+    internal let content: Content
+
+    public init(@ViewBuilder content: () -> Content, @ViewBuilder label: () -> Label) {
+        self.content = content()
+        self.label = label()
+    }
+
+    public typealias Body = Never
+}
+
+public extension Menu where Label == Text {
+    init<S: StringProtocol>(_ title: S, @ViewBuilder content: () -> Content) {
+        self.init(content: content) { Text(title) }
+    }
+}
+
+extension Menu: PrimitiveView {
+    public func _render(in context: ResolveContext) -> RenderNode {
+        let labelNodes = Evaluator.resolveChildren(label, context.descending("label"))
+        let title = labelNodes.lazy.compactMap(firstTextString).first ?? ""
+        return RenderNode(
+            type: "Menu",
+            id: context.path,
+            props: ["label": .string(title)],
+            children: Evaluator.resolveChildren(content, context.descending("content"))
+        )
+    }
+}
+
+/// The first Text content found in a node subtree, if any.
+internal func firstTextString(_ node: RenderNode) -> String? {
+    if node.type == "Text", case .string(let text)? = node.props["text"] { return text }
+    for child in node.children {
+        if let text = firstTextString(child) { return text }
+    }
+    return nil
+}