Add Map with coordinate regions and markers

Author: colemancda

AndroidSwiftUICore/Sources/AndroidSwiftUICore/Primitives/Map.swift

@@ -0,0 +1,87 @@
+//
+//  Map.swift
+//  AndroidSwiftUICore
+//
+//  A map showing a coordinate region with markers. The interpreter renders a
+//  schematic map — markers positioned proportionally within the visible
+//  region — until a tile provider is registered through the composable
+//  registry (real tiles need a maps SDK and API key on Android).
+//
+
+public struct CLLocationCoordinate2D: Equatable, Sendable {
+    public var latitude: Double
+    public var longitude: Double
+    public init(latitude: Double, longitude: Double) {
+        self.latitude = latitude
+        self.longitude = longitude
+    }
+}
+
+public struct MKCoordinateSpan: Equatable, Sendable {
+    public var latitudeDelta: Double
+    public var longitudeDelta: Double
+    public init(latitudeDelta: Double, longitudeDelta: Double) {
+        self.latitudeDelta = latitudeDelta
+        self.longitudeDelta = longitudeDelta
+    }
+}
+
+public struct MKCoordinateRegion: Equatable, Sendable {
+    public var center: CLLocationCoordinate2D
+    public var span: MKCoordinateSpan
+    public init(center: CLLocationCoordinate2D, span: MKCoordinateSpan) {
+        self.center = center
+        self.span = span
+    }
+}
+
+/// A map annotation: a titled pin at a coordinate.
+public struct MapMarker: Sendable {
+    public var title: String
+    public var coordinate: CLLocationCoordinate2D
+    public var tint: Color?
+    public init(_ title: String, coordinate: CLLocationCoordinate2D, tint: Color? = nil) {
+        self.title = title
+        self.coordinate = coordinate
+        self.tint = tint
+    }
+}
+
+public struct Map: View {
+
+    internal let region: Binding<MKCoordinateRegion>
+    internal let markers: [MapMarker]
+
+    public init(coordinateRegion: Binding<MKCoordinateRegion>, markers: [MapMarker] = []) {
+        self.region = coordinateRegion
+        self.markers = markers
+    }
+
+    public typealias Body = Never
+}
+
+extension Map: PrimitiveView {
+    public func _render(in context: ResolveContext) -> RenderNode {
+        let value = region.wrappedValue
+        let children = markers.enumerated().map { index, marker -> RenderNode in
+            var props: [String: PropValue] = [
+                "title": .string(marker.title),
+                "latitude": .double(marker.coordinate.latitude),
+                "longitude": .double(marker.coordinate.longitude),
+            ]
+            if let tint = marker.tint { props["tint"] = tint.propValue }
+            return RenderNode(type: "MapMarker", id: context.path + "/marker#\(index)", props: props)
+        }
+        return RenderNode(
+            type: "Map",
+            id: context.path,
+            props: [
+                "centerLatitude": .double(value.center.latitude),
+                "centerLongitude": .double(value.center.longitude),
+                "spanLatitude": .double(value.span.latitudeDelta),
+                "spanLongitude": .double(value.span.longitudeDelta),
+            ],
+            children: children
+        )
+    }
+}