Add DatePicker bound to a Foundation Date

Author: colemancda

AndroidSwiftUICore/Sources/AndroidSwiftUICore/Primitives/DatePicker.swift

@@ -0,0 +1,47 @@
+//
+//  DatePicker.swift
+//  AndroidSwiftUICore
+//
+//  A control for choosing a calendar date. The selection round-trips the
+//  bridge as milliseconds since the Unix epoch — Compose's Material3
+//  DatePickerState currency, and a trivial conversion from Foundation's Date.
+//
+
+import Foundation
+
+public struct DatePicker<Label: View>: View {
+
+    internal let label: Label
+    internal let selection: Binding<Date>
+
+    public init(selection: Binding<Date>, @ViewBuilder label: () -> Label) {
+        self.label = label()
+        self.selection = selection
+    }
+
+    public typealias Body = Never
+}
+
+public extension DatePicker where Label == Text {
+    init<S: StringProtocol>(_ title: S, selection: Binding<Date>) {
+        self.init(selection: selection) { Text(title) }
+    }
+}
+
+extension DatePicker: PrimitiveView {
+    public func _render(in context: ResolveContext) -> RenderNode {
+        let binding = selection
+        let callbackID = context.callbacks.register(.double { millis in
+            binding.wrappedValue = Date(timeIntervalSince1970: millis / 1000)
+        })
+        return RenderNode(
+            type: "DatePicker",
+            id: context.path,
+            props: [
+                "millis": .double(selection.wrappedValue.timeIntervalSince1970 * 1000),
+                "onChange": .int(Int(callbackID)),
+            ],
+            children: Evaluator.resolveChildren(label, context.descending("label"))
+        )
+    }
+}