Add const values for new surface colors.

.fvmrc

@@ -1,4 +1,4 @@
 {
-  "flutter": "beta",
+  "flutter": "stable",
   "flavors": {}
 }

.vscode/settings.json

@@ -20,5 +20,5 @@
     "Tert",
     "themedata"
   ],
-  "dart.flutterSdkPath": ".fvm/versions/beta"
+  "dart.flutterSdkPath": ".fvm/versions/stable"
 }

CHANGELOG.md

@@ -4,7 +4,7 @@ All changes to the **FlexColorScheme** (FCS) package are documented here.
 
 ## 8.0.0-dev.1 - WIP
 
-**May 22, 2024**
+**May 30, 2024**
 
 **PACKAGE**
 
@@ -36,6 +36,7 @@ more aligned with Flutter's Material-3 theming defaults, by using them as starti
 
 **NEW**
 
+- Added color constants for new Material-3 surface colors based on the monochrome seeded scheme, and its standard tones. These are used as baseline for different surface shades in FCS when seed generated colors are not being used.
 - Added `variant` a `FlexSchemeVariant` to FlexColorsScheme/FlexThemeData light and dark. This is used to define the variant of the seeded `ColorScheme`. It is an alternative to `tones` that also includes scheme seed variants that Flutter SDK had planned to include in version 3.22, but that did not land yet. The variants like `fidelity` will come later to Flutter. With FlexColorScheme 8.0.0 you can use them already now. 
 
 - Added `isDense` property to `FlexSubThemes.inputDecoratorTheme()`.

lib/src/flex_color.dart

@@ -78,6 +78,138 @@ class FlexColor {
   /// FlexColors standard for dark scaffold background, same as Material.
   static const Color darkScaffoldBackground = Color(0xFF121212);
 
+  // New surface colors in revised Material-3 design style that landed in
+  // Flutter 3.22.0. The new surface colors are used by the new ColorScheme
+  // in the updated Material-3 design system.
+
+  // Add these light surface colors
+  // surface 0xFFF9F9F9 Tone98 Consider 0xFFFCFCFC Tone99 instead
+  // surfaceDim 0xFFDADADA Tone87
+  // surfaceBright 0xFFF9F9F9 Tone98
+  // surfaceContainerLowest 0xFFFFFFFF Tone100
+  // surfaceContainerLow 0xFFF3F3F3 Tone96
+  // surfaceContainer 0xFFEEEEEE Tone94
+  // surfaceContainerHigh 0xFFE8E8E8 Tone92
+  // surfaceContainerHighest 0xFFE2E2E2 Tone90
+  // onSurface 0xFF1B1B1B Tone10
+  // onSurfaceVariant 0xFF474747 Tone30
+  // inverseSurface 0xFF303030 Tone20
+  // onInverseSurface 0xFFF1F1F1 Tone95
+
+  /// None tinted neutral surface color used as FlexColor standard for light
+  /// surface. Based on M3 monochrome tone 98.
+  static const Color lightM3Surface = Color(0xFFF9F9F9);
+
+  /// None tinted neutral surfaceDim color used as FlexColor standard for light
+  /// surfaceDim. Based on M3 monochrome tone 87.
+  static const Color lightM3SurfaceDim = Color(0xFFDADADA);
+
+  /// None tinted neutral surfaceBright color used as FlexColor standard for
+  /// light surfaceBright. Based on M3 monochrome tone 98.
+  static const Color lightM3SurfaceBright = Color(0xFFF9F9F9);
+
+  /// None tinted neutral surfaceContainerLowest color used as FlexColor
+  /// standard for light surfaceContainerLowest.
+  /// Based on M3 monochrome tone 100.
+  static const Color lightM3SurfaceContainerLowest = Color(0xFFFFFFFF);
+
+  /// None tinted neutral surfaceContainerLow color used as FlexColor standard
+  /// for light surfaceContainerLow. Based on M3 monochrome tone 96.
+  static const Color lightM3SurfaceContainerLow = Color(0xFFF3F3F3);
+
+  /// None tinted neutral surfaceContainer color used as FlexColor standard for
+  /// light surfaceContainer. Based on M3 monochrome tone 94.
+  static const Color lightM3SurfaceContainer = Color(0xFFEEEEEE);
+
+  /// None tinted neutral surfaceContainerHigh color used as FlexColor standard
+  /// for light surfaceContainerHigh. Based on M3 monochrome tone 92.
+  static const Color lightM3SurfaceContainerHigh = Color(0xFFE8E8E8);
+
+  /// None tinted neutral surfaceContainerHighest color used as FlexColor
+  /// standard for light surfaceContainerHighest.
+  /// Based on M3 monochrome tone 90.
+  static const Color lightM3SurfaceContainerHighest = Color(0xFFE2E2E2);
+
+  /// None tinted neutral onSurface color used as FlexColor standard for light
+  /// onSurface. Based on M3 monochrome tone 10.
+  static const Color lightM3OnSurface = Color(0xFF1B1B1B);
+
+  /// None tinted neutral onSurfaceVariant color used as FlexColor standard for
+  /// light onSurfaceVariant. Based on M3 monochrome tone 30.
+  static const Color lightM3OnSurfaceVariant = Color(0xFF474747);
+
+  /// None tinted neutral inverseSurface color used as FlexColor standard for
+  /// light inverseSurface. Based on M3 monochrome tone 20.
+  static const Color lightM3InverseSurface = Color(0xFF303030);
+
+  /// None tinted neutral onInverseSurface color used as FlexColor standard for
+  /// light onInverseSurface. Based on M3 monochrome tone 95.
+  static const Color lightM3OnInverseSurface = Color(0xFFF1F1F1);
+
+  // Add these dark surface colors
+  // surface 0xFF131313 Tone6 Consider 0xFF0E0E0E Tone4 instead
+  // surfaceDim 0xFF131313 Tone6 Consider 0xFF0E0E0E Tone4 instead
+  // surfaceBright 0xFF393939 Tone24
+  // surfaceContainerLowest 0xFF0E0E0E Tone4 Consider 0xFF070707 Tone2 instead
+  // surfaceContainerLow 0xFF1B1B1B Tone10
+  // surfaceContainer 0xFF1F1F1F Tone12
+  // surfaceContainerHigh 0xFF2A2A2A Tone17
+  // surfaceContainerHighest 0xFF353535 Tone22
+  // onSurface 0xFFE2E2E2 Tone90
+  // onSurfaceVariant 0xFFC6C6C6 Tone80
+  // inverseSurface 0xFFE2E2E2 Tone90
+  // onInverseSurface 0xFF303030 Tone20
+
+  /// None tinted neutral surface color used as FlexColor standard for dark
+  /// surface. Based on M3 monochrome tone 6.
+  static const Color darkM3Surface = Color(0xFF131313);
+
+  /// None tinted neutral surfaceDim color used as FlexColor standard for dark
+  /// surfaceDim. Based on M3 monochrome tone 6.
+  static const Color darkM3SurfaceDim = Color(0xFF131313);
+
+  /// None tinted neutral surfaceBright color used as FlexColor standard for
+  /// dark surfaceBright. Based on M3 monochrome tone 24.
+  static const Color darkM3SurfaceBright = Color(0xFF393939);
+
+  /// None tinted neutral surfaceContainerLowest color used as FlexColor
+  /// standard for dark surfaceContainerLowest.
+  /// Based on M3 monochrome tone 4.
+  static const Color darkM3SurfaceContainerLowest = Color(0xFF0E0E0E);
+
+  /// None tinted neutral surfaceContainerLow color used as FlexColor standard
+  /// for dark surfaceContainerLow. Based on M3 monochrome tone 10.
+  static const Color darkM3SurfaceContainerLow = Color(0xFF1B1B1B);
+
+  /// None tinted neutral surfaceContainer color used as FlexColor standard for
+  /// dark surfaceContainer. Based on M3 monochrome tone 12.
+  static const Color darkM3SurfaceContainer = Color(0xFF1F1F1F);
+
+  /// None tinted neutral surfaceContainerHigh color used as FlexColor standard
+  /// for dark surfaceContainerHigh. Based on M3 monochrome tone 17.
+  static const Color darkM3SurfaceContainerHigh = Color(0xFF2A2A2A);
+
+  /// None tinted neutral surfaceContainerHighest color used as FlexColor
+  /// standard for dark surfaceContainerHighest.
+  /// Based on M3 monochrome tone 22.
+  static const Color darkM3SurfaceContainerHighest = Color(0xFF353535);
+
+  /// None tinted neutral onSurface color used as FlexColor standard for dark
+  /// onSurface. Based on M3 monochrome tone 90.
+  static const Color darkM3OnSurface = Color(0xFFE2E2E2);
+
+  /// None tinted neutral onSurfaceVariant color used as FlexColor standard for
+  /// dark onSurfaceVariant. Based on M3 monochrome tone 80.
+  static const Color darkM3OnSurfaceVariant = Color(0xFFC6C6C6);
+
+  /// None tinted neutral inverseSurface color used as FlexColor standard for
+  /// dark inverseSurface. Based on M3 monochrome tone 90.
+  static const Color darkM3InverseSurface = Color(0xFFE2E2E2);
+
+  /// None tinted neutral onInverseSurface color used as FlexColor standard for
+  /// dark onInverseSurface. Based on M3 monochrome tone 20.
+  static const Color darkM3OnInverseSurface = Color(0xFF303030);
+
   // The Material standard error colors for light and dark modes as defined by
   // https://material.io/design/color/the-color-system.html#color-theme-creation.
   // As they were July 11, 2020.