Add extensions on CupertinoDynamicColor to try and solve what's block…

…ing #30 (#45)

lib/src/styles/colors.dart

@@ -0,0 +1,121 @@
+import 'package:flutter/cupertino.dart';
+
+import 'macos_theme.dart';
+
+extension DynamicColorX on CupertinoDynamicColor {
+  Color macosResolve(Color resolvable, BuildContext context) {
+    return (resolvable is CupertinoDynamicColor)
+        ? resolvable.macosResolveFrom(context)
+        : resolvable;
+  }
+
+  bool get isPlatformBrightnessDependent {
+    return color != darkColor ||
+        elevatedColor != darkElevatedColor ||
+        highContrastColor != darkHighContrastColor ||
+        highContrastElevatedColor != darkHighContrastElevatedColor;
+  }
+
+  bool get isHighContrastDependent {
+    return color != highContrastColor ||
+        darkColor != darkHighContrastColor ||
+        elevatedColor != highContrastElevatedColor ||
+        darkElevatedColor != darkHighContrastElevatedColor;
+  }
+
+  bool get isInterfaceElevationDependent {
+    return color != elevatedColor ||
+        darkColor != darkElevatedColor ||
+        highContrastColor != highContrastElevatedColor ||
+        darkHighContrastColor != darkHighContrastElevatedColor;
+  }
+
+  CupertinoDynamicColor macosResolveFrom(BuildContext context) {
+    Brightness brightness = Brightness.light;
+    if (this.isPlatformBrightnessDependent) {
+      brightness = MacosTheme.maybeBrightnessOf(context) ?? Brightness.light;
+    }
+    bool isHighContrastEnabled = false;
+    if (this.isHighContrastDependent) {
+      isHighContrastEnabled =
+          MediaQuery.maybeOf(context)?.highContrast ?? false;
+    }
+
+    final CupertinoUserInterfaceLevelData level =
+        this.isInterfaceElevationDependent
+            ? CupertinoUserInterfaceLevel.maybeOf(context) ??
+                CupertinoUserInterfaceLevelData.base
+            : CupertinoUserInterfaceLevelData.base;
+
+    final Color resolved;
+    switch (brightness) {
+      case Brightness.light:
+        switch (level) {
+          case CupertinoUserInterfaceLevelData.base:
+            resolved = isHighContrastEnabled ? highContrastColor : color;
+            break;
+          case CupertinoUserInterfaceLevelData.elevated:
+            resolved = isHighContrastEnabled
+                ? highContrastElevatedColor
+                : elevatedColor;
+            break;
+        }
+        break;
+      case Brightness.dark:
+        switch (level) {
+          case CupertinoUserInterfaceLevelData.base:
+            resolved =
+                isHighContrastEnabled ? darkHighContrastColor : darkColor;
+            break;
+          case CupertinoUserInterfaceLevelData.elevated:
+            resolved = isHighContrastEnabled
+                ? darkHighContrastElevatedColor
+                : darkElevatedColor;
+            break;
+        }
+    }
+
+    Element? _debugContext;
+    assert(() {
+      _debugContext = context as Element;
+      return true;
+    }());
+    return ResolvedCupertinoDynamicColor(
+      resolved,
+      color,
+      darkColor,
+      highContrastColor,
+      darkHighContrastColor,
+      elevatedColor,
+      darkElevatedColor,
+      highContrastElevatedColor,
+      darkHighContrastElevatedColor,
+      _debugContext,
+      //_debugLabel,
+    );
+  }
+}
+
+class ResolvedCupertinoDynamicColor extends CupertinoDynamicColor {
+  const ResolvedCupertinoDynamicColor(
+    Color resolvedColor,
+    Color color,
+    Color darkColor,
+    Color highContrastColor,
+    Color darkHighContrastColor,
+    Color elevatedColor,
+    Color darkElevatedColor,
+    Color highContrastElevatedColor,
+    Color darkHighContrastElevatedColor,
+    Element? debugResolveContext,
+  ) : super(
+          color: color,
+          darkColor: darkColor,
+          highContrastColor: highContrastColor,
+          darkHighContrastColor: darkHighContrastColor,
+          elevatedColor: elevatedColor,
+          darkElevatedColor: darkElevatedColor,
+          highContrastElevatedColor: highContrastElevatedColor,
+          darkHighContrastElevatedColor: darkHighContrastElevatedColor,
+        );
+}