Add dark styles for most elements

Sources/TokamakCore/Modifiers/ModifiedContent.swift

@@ -14,16 +14,23 @@
 
 /// A value with a modifier applied to it.
 public struct ModifiedContent<Content, Modifier> {
+  @Environment(\.self) public var environment
   public typealias Body = Never
-  public let content: Content
-  public let modifier: Modifier
+  public private(set) var content: Content
+  public private(set) var modifier: Modifier
 
-  @inlinable public init(content: Content, modifier: Modifier) {
+  public init(content: Content, modifier: Modifier) {
     self.content = content
     self.modifier = modifier
   }
 }
 
+extension ModifiedContent: EnvironmentReader where Modifier: EnvironmentReader {
+  mutating func setContent(from values: EnvironmentValues) {
+    modifier.setContent(from: values)
+  }
+}
+
 extension ModifiedContent: View, ParentView where Content: View, Modifier: ViewModifier {
   public var body: Body {
     neverBody("ModifiedContent<View, ViewModifier>")

Sources/TokamakCore/Modifiers/StyleModifiers.swift

@@ -15,7 +15,9 @@
 //  Created by Carson Katri on 6/29/20.
 //
 
-public struct _BackgroundModifier<Background>: ViewModifier where Background: View {
+public struct _BackgroundModifier<Background>: ViewModifier, EnvironmentReader
+  where Background: View {
+  public var environment: EnvironmentValues!
   public var background: Background
   public var alignment: Alignment
 
@@ -27,9 +29,18 @@ public struct _BackgroundModifier<Background>: ViewModifier where Background: Vi
   public func body(content: Content) -> some View {
     content
   }
+
+  mutating func setContent(from values: EnvironmentValues) {
+    environment = values
+  }
 }
 
-extension _BackgroundModifier: Equatable where Background: Equatable {}
+extension _BackgroundModifier: Equatable where Background: Equatable {
+  public static func == (lhs: _BackgroundModifier<Background>,
+                         rhs: _BackgroundModifier<Background>) -> Bool {
+    lhs.background == rhs.background
+  }
+}
 
 extension View {
   public func background<Background>(_ background: Background, alignment: Alignment = .center) -> some View where Background: View {
@@ -37,7 +48,9 @@ extension View {
   }
 }
 
-public struct _OverlayModifier<Overlay>: ViewModifier where Overlay: View {
+public struct _OverlayModifier<Overlay>: ViewModifier, EnvironmentReader
+  where Overlay: View {
+  public var environment: EnvironmentValues!
   public var overlay: Overlay
   public var alignment: Alignment
 
@@ -52,9 +65,18 @@ public struct _OverlayModifier<Overlay>: ViewModifier where Overlay: View {
       overlay
     }
   }
+
+  mutating func setContent(from values: EnvironmentValues) {
+    environment = values
+  }
 }
 
-extension _OverlayModifier: Equatable where Overlay: Equatable {}
+extension _OverlayModifier: Equatable where Overlay: Equatable {
+  public static func == (lhs: _OverlayModifier<Overlay>,
+                         rhs: _OverlayModifier<Overlay>) -> Bool {
+    lhs.overlay == rhs.overlay
+  }
+}
 
 extension View {
   public func overlay<Overlay>(_ overlay: Overlay,

Sources/TokamakCore/Shapes/ModifiedShapes.swift

@@ -16,6 +16,7 @@
 //
 
 public struct _StrokedShape<S>: Shape where S: Shape {
+  @Environment(\.self) public var environment
   public var shape: S
   public var style: StrokeStyle
 

Sources/TokamakCore/Shapes/Shape.swift

@@ -47,6 +47,7 @@ public struct FillStyle: Equatable, ShapeStyle {
 }
 
 public struct _ShapeView<Content, Style>: View where Content: Shape, Style: ShapeStyle {
+  @Environment(\.self) public var environment
   @Environment(\.foregroundColor) public var foregroundColor
   public var shape: Content
   public var style: Style

Sources/TokamakCore/Tokens/Color.swift

@@ -16,8 +16,18 @@
 //
 
 public struct Color: Hashable, Equatable {
-  // FIXME: This is not injected.
-  @Environment(\.accentColor) static var envAccentColor
+  public static func == (lhs: Self, rhs: Self) -> Bool {
+    var lightEnv = EnvironmentValues()
+    lightEnv.colorScheme = .light
+    var darkEnv = EnvironmentValues()
+    darkEnv.colorScheme = .dark
+    return lhs._evaluate(lightEnv) == rhs._evaluate(lightEnv) &&
+      lhs._evaluate(darkEnv) == rhs._evaluate(darkEnv)
+  }
+
+  public func hash(into hasher: inout Hasher) {
+    hasher.combine(evaluator(EnvironmentValues()))
+  }
 
   public enum RGBColorSpace {
     case sRGB
@@ -25,32 +35,42 @@ public struct Color: Hashable, Equatable {
     case displayP3
   }
 
-  public let red: Double
-  public let green: Double
-  public let blue: Double
-  public let opacity: Double
-  public let space: RGBColorSpace
+  public struct _RGBA: Hashable, Equatable {
+    public let red: Double
+    public let green: Double
+    public let blue: Double
+    public let opacity: Double
+    public let space: RGBColorSpace
+  }
+
+  let evaluator: (EnvironmentValues) -> _RGBA
+
+  private init(_ evaluator: @escaping (EnvironmentValues) -> _RGBA) {
+    self.evaluator = evaluator
+  }
 
   public init(_ colorSpace: RGBColorSpace = .sRGB,
               red: Double,
               green: Double,
               blue: Double,
               opacity: Double = 1) {
-    self.red = red
-    self.green = green
-    self.blue = blue
-    self.opacity = opacity
-    space = colorSpace
+    self.init { _ in
+      _RGBA(red: red,
+            green: green,
+            blue: blue,
+            opacity: opacity,
+            space: colorSpace)
+    }
   }
 
   public init(_ colorSpace: RGBColorSpace = .sRGB,
               white: Double,
               opacity: Double = 1) {
-    red = white
-    green = white
-    blue = white
-    self.opacity = opacity
-    space = colorSpace
+    self.init(colorSpace,
+              red: white,
+              green: white,
+              blue: white,
+              opacity: opacity)
   }
 
   // Source for the formula:
@@ -60,15 +80,26 @@ public struct Color: Hashable, Equatable {
               brightness: Double,
               opacity: Double = 1) {
     let a = saturation * min(brightness / 2, 1 - (brightness / 2))
-    let f: (Int) -> Double = { n in
+    let f = { (n: Int) -> Double in
       let k = Double((n + Int(hue * 12)) % 12)
       return brightness - (a * max(-1, min(k - 3, 9 - k, 1)))
     }
-    red = f(0)
-    green = f(8)
-    blue = f(4)
-    self.opacity = opacity
-    space = .sRGB
+    self.init(.sRGB,
+              red: f(0),
+              green: f(8),
+              blue: f(4),
+              opacity: opacity)
+  }
+
+  /// Create a `Color` dependent on the current `ColorScheme`.
+  public static func _withScheme(_ evaluator: @escaping (ColorScheme) -> Self) -> Self {
+    .init {
+      evaluator($0.colorScheme)._evaluate($0)
+    }
+  }
+
+  public func _evaluate(_ environment: EnvironmentValues) -> _RGBA {
+    evaluator(environment)
   }
 }
 
@@ -84,9 +115,27 @@ extension Color {
   public static let yellow: Self = .init(red: 1.00, green: 0.84, blue: 0.04)
   public static let pink: Self = .init(red: 1.00, green: 0.22, blue: 0.37)
   public static let purple: Self = .init(red: 0.75, green: 0.36, blue: 0.95)
-  // FIXME: Switch to use colorScheme
-  public static let primary: Self = .black
+  public static let primary: Self = .init {
+    switch $0.colorScheme {
+    case .light:
+      return .init(red: 0,
+                   green: 0,
+                   blue: 0,
+                   opacity: 1,
+                   space: .sRGB)
+    case .dark:
+      return .init(red: 1,
+                   green: 1,
+                   blue: 1,
+                   opacity: 1,
+                   space: .sRGB)
+    }
+  }
+
   public static let secondary: Self = .gray
+  public static let accentColor: Self = .init {
+    ($0.accentColor ?? Self.blue)._evaluate($0)
+  }
 
   public init(_ color: UIColor) {
     self = color.color
@@ -96,11 +145,11 @@ extension Color {
 extension Color: ExpressibleByIntegerLiteral {
   /// Allows initializing value of `Color` type from hex values
   public init(integerLiteral bitMask: UInt32) {
-    red = Double((bitMask & 0xFF0000) >> 16) / 255
-    green = Double((bitMask & 0x00FF00) >> 8) / 255
-    blue = Double(bitMask & 0x0000FF) / 255
-    opacity = 1
-    space = .sRGB
+    self.init(.sRGB,
+              red: Double((bitMask & 0xFF0000) >> 16) / 255,
+              green: Double((bitMask & 0x00FF00) >> 8) / 255,
+              blue: Double(bitMask & 0x0000FF) / 255,
+              opacity: 1)
   }
 }
 
@@ -117,11 +166,11 @@ extension Color {
     else {
       return nil
     }
-    self.red = Double(red) / 255
-    self.green = Double(green) / 255
-    self.blue = Double(blue) / 255
-    opacity = 1
-    space = .sRGB
+    self.init(.sRGB,
+              red: Double(red) / 255,
+              green: Double(green) / 255,
+              blue: Double(blue) / 255,
+              opacity: 1)
   }
 }
 
@@ -153,12 +202,6 @@ extension View {
   }
 }
 
-extension Color {
-  public static var accentColor: Self {
-    envAccentColor ?? .blue
-  }
-}
-
 struct ForegroundColorKey: EnvironmentKey {
   static let defaultValue: Color? = nil
 }

Sources/TokamakCore/Views/Spacers/Divider.swift

@@ -17,6 +17,7 @@
 
 /// A horizontal line for separating content.
 public struct Divider: View {
+  @Environment(\.self) public var environment
   public init() {}
   public var body: Never {
     neverBody("Divider")

Sources/TokamakCore/Views/Text/Text.swift

@@ -33,6 +33,7 @@ public struct Text: View {
   let storage: _Storage
   let modifiers: [_Modifier]
 
+  @Environment(\.self) public var environment
   @Environment(\.font) var font
   @Environment(\.foregroundColor) var foregroundColor
   @Environment(\.redactionReasons) var redactionReasons

Sources/TokamakDOM/App/App.swift

@@ -30,7 +30,7 @@ extension App {
   ///
   public static func _launch(_ app: Self, _ rootEnvironment: EnvironmentValues) {
     let body = TokamakDOM.body
-    if body.style == .undefined {
+    if body.style.object!.all == "" {
       body.style = "margin: 0;"
     }
     let rootStyle = document.createElement!("style").object!
@@ -44,7 +44,7 @@ extension App {
     _ = body.appendChild!(div)
 
     ScenePhaseObserver.observe()
-    ColorSchemeObserver.observe()
+    ColorSchemeObserver.observe(div)
   }
 
   public static func _setTitle(_ title: String) {

Sources/TokamakDOM/App/ColorSchemeObserver.swift

@@ -21,13 +21,23 @@ enum ColorSchemeObserver {
   )
 
   private static var closure: JSClosure?
+  private static var cancellable: AnyCancellable?
 
-  static func observe() {
+  static func observe(_ rootElement: JSObjectRef) {
     let closure = JSClosure {
       publisher.value = .init(matchMediaDarkScheme: $0[0].object!)
       return .undefined
     }
     _ = matchMediaDarkScheme.addEventListener!("change", closure)
     Self.closure = closure
+    Self.cancellable = Self.publisher.sink { colorScheme in
+      let systemBackground = { () -> String in
+        switch colorScheme {
+        case .light: return "#FFFFFF"
+        case .dark: return "rgb(38, 38, 38)"
+        }
+      }()
+      rootElement.style.object!.backgroundColor = .string("\(systemBackground)")
+    }
   }
 }

Sources/TokamakDOM/Views/Buttons/Button.swift

@@ -21,7 +21,7 @@ extension _Button: ViewDeferredToRenderer where Label == Text {
   public var deferredBody: AnyView {
     let attributes: [String: String]
     if buttonStyle.type == DefaultButtonStyle.self {
-      attributes = [:]
+      attributes = ["class": "_tokamak-buttonstyle-default"]
     } else {
       attributes = ["class": "_tokamak-buttonstyle-reset"]
     }

Sources/TokamakDOM/Views/Selectors/Picker.swift

@@ -21,7 +21,7 @@ extension _PickerContainer: ViewDeferredToRenderer {
     AnyView(HTML("label") {
       label
       Text(" ")
-      DynamicHTML("select", listeners: ["change": {
+      DynamicHTML("select", ["class": "_tokamak-picker"], listeners: ["change": {
         guard
           let valueString = $0.target.object!.value.string,
           let value = Int(valueString) as? SelectionValue

Sources/TokamakDOM/Views/Text/SecureField.swift

@@ -24,6 +24,7 @@ extension SecureField: ViewDeferredToRenderer where Label == Text {
       "type": "password",
       "value": proxy.textBinding.wrappedValue,
       "placeholder": proxy.label.rawText,
+      "class": "_tokamak-securefield",
     ], listeners: [
       "keypress": { event in if event.key == "Enter" { proxy.onCommit() } },
       "input": { event in

Sources/TokamakDOM/Views/Text/TextField.swift

@@ -17,18 +17,29 @@
 
 import TokamakCore
 
-func css(for style: TextFieldStyle) -> String {
-  if style is PlainTextFieldStyle {
-    return """
-    background: transparent;
-    border: none;
-    """
-  } else {
-    return ""
-  }
-}
-
 extension TextField: ViewDeferredToRenderer where Label == Text {
+  func css(for style: TextFieldStyle) -> String {
+    if style is PlainTextFieldStyle {
+      return """
+      background: transparent;
+      border: none;
+      """
+    } else {
+      return ""
+    }
+  }
+
+  func className(for style: TextFieldStyle) -> String {
+    switch style {
+    case is DefaultTextFieldStyle:
+      return "_tokamak-textfield-default"
+    case is RoundedBorderTextFieldStyle:
+      return "_tokamak-textfield-roundedborder"
+    default:
+      return ""
+    }
+  }
+
   public var deferredBody: AnyView {
     let proxy = _TextFieldProxy(self)
 
@@ -37,6 +48,7 @@ extension TextField: ViewDeferredToRenderer where Label == Text {
       "value": proxy.textBinding.wrappedValue,
       "placeholder": proxy.label.rawText,
       "style": css(for: proxy.textFieldStyle),
+      "class": className(for: proxy.textFieldStyle),
     ], listeners: [
       "focus": { _ in proxy.onEditingChanged(true) },
       "blur": { _ in proxy.onEditingChanged(false) },

Sources/TokamakDemo/ColorDemo.swift

@@ -36,20 +36,20 @@ public struct ColorDemo: View {
     case rgb, hsb
   }
 
-  let colors: [Color] = [
-    .clear,
-    .black,
-    .white,
-    .gray,
-    .red,
-    .green,
-    .blue,
-    .orange,
-    .yellow,
-    .pink,
-    .purple,
-    .primary,
-    .secondary,
+  let colors: [(String, Color)] = [
+    ("Clear", .clear),
+    ("Black", .black),
+    ("White", .white),
+    ("Gray", .gray),
+    ("Red", .red),
+    ("Green", .green),
+    ("Blue", .blue),
+    ("Orange", .orange),
+    ("Yellow", .yellow),
+    ("Pink", .pink),
+    ("Purple", .purple),
+    ("Primary", .primary),
+    ("Secondary", .secondary),
   ]
 
   @State private var colorForm: ColorForm = .hsb
@@ -71,16 +71,16 @@ public struct ColorDemo: View {
           .bold()
           .padding()
           .background(color)
-        Text("Accent Color: \(Color.accentColor.description)")
+        Text("Accent Color: \(String(describing: Color.accentColor))")
           .bold()
           .padding()
           .background(Color.accentColor)
-        ForEach(colors, id: \.self) {
-          Text($0.description)
+        ForEach(colors, id: \.0) {
+          Text($0.0)
             .font(.caption)
             .bold()
             .padding()
-            .background($0)
+            .background($0.1)
         }
       }.padding(.horizontal)
     }

Sources/TokamakStaticHTML/Modifiers/ViewModifier.swift

@@ -47,6 +47,6 @@ extension _ZIndexModifier: DOMViewModifier {
 extension _BackgroundModifier: DOMViewModifier where Background == Color {
   public var isOrderDependent: Bool { true }
   public var attributes: [String: String] {
-    ["style": "background-color: \(background.description)"]
+    ["style": "background-color: \(background.cssValue(environment))"]
   }
 }

Sources/TokamakStaticHTML/Resources/TokamakStyles.swift

@@ -76,6 +76,34 @@ public let tokamakStyles = """
   height: 1.2em;
   border-radius: .1em;
 }
+
+@media (prefers-color-scheme:dark) {
+  ._tokamak-buttonstyle-default {
+    background-color: rgb(99, 95, 98);
+  }
+
+  ._tokamak-securefield {
+    background-color: rgb(99, 95, 98);
+    color: #FFFFFF;
+  }
+  ._tokamak-textfield-default {
+    background-color: rgb(99, 95, 98);
+    color: #FFFFFF;
+  }
+  ._tokamak-textfield-roundedborder {
+    background-color: rgb(99, 95, 98);
+    color: #FFFFFF;
+  }
+
+  ._tokamak-picker {
+    background-color: rgb(99, 95, 98);
+    color: #FFFFFF;
+  }
+
+  ._tokamak-text-redacted::after {
+    background-color: rgb(100, 100, 100);
+  }
+}
 """
 
 public let rootNodeStyles = """

Sources/TokamakStaticHTML/Shapes/Shape.swift

@@ -25,7 +25,7 @@ extension _OverlayModifier: DOMViewModifier
     return ["style": """
     border-style: \(style);
     border-width: \(overlay.shape.style.lineWidth);
-    border-color: \(overlay.style.description);
+    border-color: \(overlay.style.cssValue(environment));
     border-radius: inherit;
     """]
   }

Sources/TokamakStaticHTML/Shapes/_ShapeView.swift

@@ -24,7 +24,7 @@ protocol ShapeAttributes {
 extension _StrokedShape: ShapeAttributes {
   func attributes(_ style: ShapeStyle) -> [String: String] {
     if let color = style as? Color {
-      return ["style": "stroke: \(color); fill: none;"]
+      return ["style": "stroke: \(color.cssValue(environment)); fill: none;"]
     } else {
       return ["style": "stroke: black; fill: none;"]
     }
@@ -37,9 +37,9 @@ extension _ShapeView: ViewDeferredToRenderer {
     if let shapeAttributes = shape as? ShapeAttributes {
       return AnyView(HTML("div", shapeAttributes.attributes(style)) { path })
     } else if let color = style as? Color {
-      return AnyView(HTML("div", ["style": "fill: \(color);"]) { path })
+      return AnyView(HTML("div", ["style": "fill: \(color.cssValue(environment));"]) { path })
     } else if let foregroundColor = foregroundColor {
-      return AnyView(HTML("div", ["style": "fill: \(foregroundColor);"]) { path })
+      return AnyView(HTML("div", ["style": "fill: \(foregroundColor.cssValue(environment));"]) { path })
     } else {
       return path
     }

Sources/TokamakStaticHTML/Tokens/Tokens.swift

@@ -14,9 +14,10 @@
 
 import TokamakCore
 
-extension Color: CustomStringConvertible {
-  public var description: String {
-    "rgb(\(red * 255), \(green * 255), \(blue * 255), \(opacity * 255))"
+extension Color {
+  func cssValue(_ environment: EnvironmentValues) -> String {
+    let rgba = _evaluate(environment)
+    return "rgba(\(rgba.red * 255), \(rgba.green * 255), \(rgba.blue * 255), \(rgba.opacity))"
   }
 }
 

Sources/TokamakStaticHTML/Views/Containers/List.swift

@@ -94,7 +94,12 @@ extension SidebarListStyle: ListStyleDeferredToRenderer {
     AnyView(content
       .padding(.all)
       .padding(.leading, 20)
-      .background(Color(0xF2F2F7))
+      .background(Color._withScheme {
+        switch $0 {
+        case .light: return Color(0xF2F2F7)
+        case .dark: return Color(.sRGB, red: 45 / 255, green: 43 / 255, blue: 48 / 255)
+        }
+      })
     )
   }
 }

Sources/TokamakStaticHTML/Views/Spacers/Divider.swift

@@ -23,7 +23,12 @@ extension Divider: AnyHTML {
       width: 100%; height: 0; margin: 0;
       border-top: none;
       border-right: none;
-      border-bottom: 1px solid rgba(0, 0, 0, 0.2);
+      border-bottom: 1px solid \(Color._withScheme {
+        switch $0 {
+        case .light: return .init(.sRGB, white: 0, opacity: 0.2)
+        case .dark: return .init(.sRGB, white: 1, opacity: 0.2)
+        }
+      }.cssValue(environment));
       border-left: none;
       """,
     ]

Sources/TokamakStaticHTML/Views/Text/Text.swift

@@ -151,13 +151,13 @@ extension Text: AnyHTML {
         }
       }.inlineStyles ?? "")
       \(font == nil ? "font-family: \(Font.Design.default.description);" : "")
-      color: \(color?.description ?? "inherit");
+      color: \((color ?? .primary).cssValue(environment));
       font-style: \(italic ? "italic" : "normal");
       font-weight: \(weight?.value ?? font?._weight.value ?? 400);
       letter-spacing: \(kerning);
       vertical-align: \(baseline == nil ? "baseline" : "\(baseline!)em");
       text-decoration: \(textDecoration);
-      text-decoration-color: \(strikethrough?.1?.description ?? underline?.1?.description
+      text-decoration-color: \(strikethrough?.1?.cssValue(environment) ?? underline?.1?.cssValue(environment)
         ?? "inherit")
       """,
       "class": isRedacted ? "_tokamak-text-redacted" : "",

Tests/TokamakTests/ColorTests.swift

@@ -17,7 +17,8 @@ import XCTest
 
 final class ColorTests: XCTestCase {
   func testHexColors() {
-    guard let color = Color(hex: "#FF00FF") else {
+    let env = EnvironmentValues()
+    guard let color = Color(hex: "#FF00FF")?._evaluate(env) else {
       XCTFail("Hexadecimal decoding failed")
       return
     }
@@ -28,11 +29,11 @@ final class ColorTests: XCTestCase {
 
     XCTAssertEqual(
       color,
-      Color(hex: "FF00FF"),
+      Color(hex: "FF00FF")?._evaluate(env),
       "The '#' before a hex code produced a different output than without it"
     )
 
-    guard let red = Color(hex: "#FF0000") else {
+    guard let red = Color(hex: "#FF0000")?._evaluate(env) else {
       XCTFail("Hexadecimal decoding failed")
       return
     }
@@ -41,7 +42,7 @@ final class ColorTests: XCTestCase {
     XCTAssertEqual(red.green, 0)
     XCTAssertEqual(red.blue, 0)
 
-    guard let green = Color(hex: "#00FF00") else {
+    guard let green = Color(hex: "#00FF00")?._evaluate(env) else {
       XCTFail("Hexadecimal decoding failed")
       return
     }
@@ -50,7 +51,7 @@ final class ColorTests: XCTestCase {
     XCTAssertEqual(green.green, 1)
     XCTAssertEqual(green.blue, 0)
 
-    guard let blue = Color(hex: "#0000FF") else {
+    guard let blue = Color(hex: "#0000FF")?._evaluate(env) else {
       XCTFail("Hexadecimal decoding failed")
       return
     }