Add border, shadow, and clipShape modifiers

Author: colemancda

AndroidSwiftUICore/Sources/AndroidSwiftUICore/Modifiers/AppearanceModifiers.swift

@@ -0,0 +1,82 @@
+//
+//  AppearanceModifiers.swift
+//  AndroidSwiftUICore
+//
+//  Visual modifiers that fold into the Compose Modifier chain: border, shadow,
+//  and clipShape.
+//
+
+// MARK: - Border
+
+public struct _BorderModifier: RenderModifier {
+    let color: Color
+    let width: Double
+    public var _modifierNode: ModifierNode {
+        ModifierNode(kind: "border", args: ["color": color.propValue, "width": .double(width)])
+    }
+}
+
+public extension View {
+    func border(_ color: Color, width: Double = 1) -> ModifiedContent<Self, _BorderModifier> {
+        modifier(_BorderModifier(color: color, width: width))
+    }
+}
+
+// MARK: - Shadow
+
+public struct _ShadowModifier: RenderModifier {
+    let radius: Double
+    public var _modifierNode: ModifierNode {
+        ModifierNode(kind: "shadow", args: ["radius": .double(radius)])
+    }
+}
+
+public extension View {
+    func shadow(radius: Double, x: Double = 0, y: Double = 0) -> ModifiedContent<Self, _ShadowModifier> {
+        modifier(_ShadowModifier(radius: radius))
+    }
+    func shadow(color: Color, radius: Double, x: Double = 0, y: Double = 0) -> ModifiedContent<Self, _ShadowModifier> {
+        modifier(_ShadowModifier(radius: radius))
+    }
+}
+
+// MARK: - Clip shape
+
+/// A shape reduced to the fields the interpreter needs to build a Compose shape.
+public protocol _ShapeKind {
+    var _shapeKind: String { get }
+    var _cornerRadius: Double? { get }
+}
+
+extension Rectangle: _ShapeKind {
+    public var _shapeKind: String { "rectangle" }
+    public var _cornerRadius: Double? { nil }
+}
+extension Circle: _ShapeKind {
+    public var _shapeKind: String { "circle" }
+    public var _cornerRadius: Double? { nil }
+}
+extension Capsule: _ShapeKind {
+    public var _shapeKind: String { "capsule" }
+    public var _cornerRadius: Double? { nil }
+}
+extension RoundedRectangle: _ShapeKind {
+    public var _shapeKind: String { "roundedRectangle" }
+    public var _cornerRadius: Double? { cornerRadius }
+}
+
+public struct _ClipShapeModifier: RenderModifier {
+    let kind: String
+    let cornerRadius: Double?
+    public var _modifierNode: ModifierNode {
+        var args: [String: PropValue] = ["shape": .string(kind)]
+        if let cornerRadius { args["cornerRadius"] = .double(cornerRadius) }
+        return ModifierNode(kind: "clipShape", args: args)
+    }
+}
+
+public extension View {
+    func clipShape<S: _ShapeKind>(_ shape: S) -> ModifiedContent<Self, _ClipShapeModifier> {
+        modifier(_ClipShapeModifier(kind: shape._shapeKind, cornerRadius: shape._cornerRadius))
+    }
+}