Add Enabled environment key and disabled modifier

Sources/OpenSwiftUICore/Data/Environment/Enabled.swift

@@ -0,0 +1,81 @@
+//
+//  Enabled.swift
+//  OpenSwiftUICore
+//
+//  Status: Complete
+//  ID: 09CE35833F3876FE3A3A46977D61FC64 (SwiftUICore)
+
+package import OpenGraphShims
+
+// MARK: - EnabledKey [6.5.4]
+
+private struct EnabledKey: EnvironmentKey {
+    static let defaultValue: Bool = true
+}
+
+@available(OpenSwiftUI_v1_0, *)
+extension EnvironmentValues {
+    /// A Boolean value that indicates whether the view associated with this
+    /// environment allows user interaction.
+    ///
+    /// The default value is `true`.
+    public var isEnabled: Bool {
+        get { self[EnabledKey.self] }
+        set { self[EnabledKey.self] = newValue }
+    }
+}
+
+extension View {
+    /// Adds a condition that controls whether users can interact with this
+    /// view.
+    ///
+    /// The higher views in a view hierarchy can override the value you set on
+    /// this view. In the following example, the button isn't interactive
+    /// because the outer `disabled(_:)` modifier overrides the inner one:
+    ///
+    ///     HStack {
+    ///         Button(Text("Press")) {}
+    ///         .disabled(false)
+    ///     }
+    ///     .disabled(true)
+    ///
+    /// - Parameter disabled: A Boolean value that determines whether users can
+    ///   interact with this view.
+    ///
+    /// - Returns: A view that controls whether users can interact with this
+    ///   view.
+    @inlinable
+    nonisolated public func disabled(_ disabled: Bool) -> some View {
+        modifier(
+            _EnvironmentKeyTransformModifier(
+                keyPath: \.isEnabled
+            ) { $0 = $0 && !disabled }
+        )
+    }
+
+    package func _disabled(_ disabled: Bool) -> ModifiedContent<Self, _EnvironmentKeyTransformModifier<Bool>> {
+        modifier(
+            _EnvironmentKeyTransformModifier(
+                keyPath: \.isEnabled
+            ) { $0 = $0 && !disabled }
+        )
+    }
+}
+
+// MARK: - EnabledKey + CachedEnvironment [6.4.41]
+
+extension CachedEnvironment.ID {
+    static let isEnabled: CachedEnvironment.ID = .init()
+}
+
+extension _GraphInputs {
+    package var isEnabled: Attribute<Bool> {
+        mapEnvironment(id: .isEnabled) { $0.isEnabled }
+    }
+}
+
+extension _ViewInputs {
+    package var isEnabled: Attribute<Bool> {
+        mapEnvironment(id: .isEnabled) { $0.isEnabled }
+    }
+}