Add shape views (Rectangle, Circle, Capsule, RoundedRectangle)

Author: colemancda

AndroidSwiftUICore/Sources/AndroidSwiftUICore/Primitives/Shapes.swift

@@ -0,0 +1,68 @@
+//
+//  Shapes.swift
+//  AndroidSwiftUICore
+//
+//  Shape views fill their frame with a fill color. A shape without an explicit
+//  `.frame` renders at zero size (the layout engine's fill-the-parent behavior
+//  is not modeled); the catalog always frames them.
+//
+
+private func shapeNode(_ kind: String, fill: Color?, cornerRadius: Double? = nil, context: ResolveContext) -> RenderNode {
+    var props: [String: PropValue] = ["shape": .string(kind)]
+    if let fill { props["fill"] = fill.propValue }
+    if let cornerRadius { props["cornerRadius"] = .double(cornerRadius) }
+    return RenderNode(type: "Shape", id: context.path, props: props)
+}
+
+public struct Rectangle: View {
+    internal var fillColor: Color?
+    public init() {}
+    public func fill(_ color: Color) -> Rectangle { var copy = self; copy.fillColor = color; return copy }
+    public typealias Body = Never
+}
+
+extension Rectangle: PrimitiveView {
+    public func _render(in context: ResolveContext) -> RenderNode {
+        shapeNode("rectangle", fill: fillColor, context: context)
+    }
+}
+
+public struct Circle: View {
+    internal var fillColor: Color?
+    public init() {}
+    public func fill(_ color: Color) -> Circle { var copy = self; copy.fillColor = color; return copy }
+    public typealias Body = Never
+}
+
+extension Circle: PrimitiveView {
+    public func _render(in context: ResolveContext) -> RenderNode {
+        shapeNode("circle", fill: fillColor, context: context)
+    }
+}
+
+public struct Capsule: View {
+    internal var fillColor: Color?
+    public init() {}
+    public func fill(_ color: Color) -> Capsule { var copy = self; copy.fillColor = color; return copy }
+    public typealias Body = Never
+}
+
+extension Capsule: PrimitiveView {
+    public func _render(in context: ResolveContext) -> RenderNode {
+        shapeNode("capsule", fill: fillColor, context: context)
+    }
+}
+
+public struct RoundedRectangle: View {
+    internal let cornerRadius: Double
+    internal var fillColor: Color?
+    public init(cornerRadius: Double) { self.cornerRadius = cornerRadius }
+    public func fill(_ color: Color) -> RoundedRectangle { var copy = self; copy.fillColor = color; return copy }
+    public typealias Body = Never
+}
+
+extension RoundedRectangle: PrimitiveView {
+    public func _render(in context: ResolveContext) -> RenderNode {
+        shapeNode("roundedRectangle", fill: fillColor, cornerRadius: cornerRadius, context: context)
+    }
+}