Make it possible to obtain FontWeight integer value

lib/ui/text.dart

@@ -14,37 +14,40 @@ enum FontStyle {
 
 /// The thickness of the glyphs used to draw the text
 class FontWeight {
-  const FontWeight._(this.index);
+  const FontWeight._(this.index, this.value);
 
   /// The encoded integer value of this font weight.
   final int index;
 
+  /// The thickness value of this font weight.
+  final int value;
+
   /// Thin, the least thick
-  static const FontWeight w100 = FontWeight._(0);
+  static const FontWeight w100 = FontWeight._(0, 100);
 
   /// Extra-light
-  static const FontWeight w200 = FontWeight._(1);
+  static const FontWeight w200 = FontWeight._(1, 200);
 
   /// Light
-  static const FontWeight w300 = FontWeight._(2);
+  static const FontWeight w300 = FontWeight._(2, 300);
 
   /// Normal / regular / plain
-  static const FontWeight w400 = FontWeight._(3);
+  static const FontWeight w400 = FontWeight._(3, 400);
 
   /// Medium
-  static const FontWeight w500 = FontWeight._(4);
+  static const FontWeight w500 = FontWeight._(4, 500);
 
   /// Semi-bold
-  static const FontWeight w600 = FontWeight._(5);
+  static const FontWeight w600 = FontWeight._(5, 600);
 
   /// Bold
-  static const FontWeight w700 = FontWeight._(6);
+  static const FontWeight w700 = FontWeight._(6, 700);
 
   /// Extra-bold
-  static const FontWeight w800 = FontWeight._(7);
+  static const FontWeight w800 = FontWeight._(7, 800);
 
   /// Black, the most thick
-  static const FontWeight w900 = FontWeight._(8);
+  static const FontWeight w900 = FontWeight._(8, 900);
 
   /// The default font weight.
   static const FontWeight normal = w400;

lib/web_ui/lib/text.dart

@@ -19,17 +19,18 @@ enum PlaceholderAlignment {
 }
 
 class FontWeight {
-  const FontWeight._(this.index);
+  const FontWeight._(this.index, this.value);
   final int index;
-  static const FontWeight w100 = FontWeight._(0);
-  static const FontWeight w200 = FontWeight._(1);
-  static const FontWeight w300 = FontWeight._(2);
-  static const FontWeight w400 = FontWeight._(3);
-  static const FontWeight w500 = FontWeight._(4);
-  static const FontWeight w600 = FontWeight._(5);
-  static const FontWeight w700 = FontWeight._(6);
-  static const FontWeight w800 = FontWeight._(7);
-  static const FontWeight w900 = FontWeight._(8);
+  final int value;
+  static const FontWeight w100 = FontWeight._(0, 100);
+  static const FontWeight w200 = FontWeight._(1, 200);
+  static const FontWeight w300 = FontWeight._(2, 300);
+  static const FontWeight w400 = FontWeight._(3, 400);
+  static const FontWeight w500 = FontWeight._(4, 500);
+  static const FontWeight w600 = FontWeight._(5, 600);
+  static const FontWeight w700 = FontWeight._(6, 700);
+  static const FontWeight w800 = FontWeight._(7, 800);
+  static const FontWeight w900 = FontWeight._(8, 900);
   static const FontWeight normal = w400;
   static const FontWeight bold = w700;
   static const List<FontWeight> values = <FontWeight>[

lib/web_ui/test/text_test.dart

@@ -352,4 +352,16 @@ Future<void> testMain() async {
           equals('hello'));
     });
   });
+
+  test('FontWeights have the correct value', () {
+    expect(FontWeight.w100.value, 100);
+    expect(FontWeight.w200.value, 200);
+    expect(FontWeight.w300.value, 300);
+    expect(FontWeight.w400.value, 400);
+    expect(FontWeight.w500.value, 500);
+    expect(FontWeight.w600.value, 600);
+    expect(FontWeight.w700.value, 700);
+    expect(FontWeight.w800.value, 800);
+    expect(FontWeight.w900.value, 900);
+  });
 }

testing/dart/text_test.dart

@@ -19,7 +19,7 @@ Future<Uint8List> readFile(String fileName) async {
   return file.readAsBytes();
 }
 
-void testFontWeightLerp() {
+void testFontWeight() {
   test('FontWeight.lerp works with non-null values', () {
     expect(FontWeight.lerp(FontWeight.w400, FontWeight.w600, .5), equals(FontWeight.w500));
   });
@@ -35,6 +35,18 @@ void testFontWeightLerp() {
   test('FontWeight.lerp returns FontWeight.w400 if b is null', () {
     expect(FontWeight.lerp(FontWeight.w400, null, 1), equals(FontWeight.w400));
   });
+
+  test('FontWeights have the correct value', () {
+    expect(FontWeight.w100.value, 100);
+    expect(FontWeight.w200.value, 200);
+    expect(FontWeight.w300.value, 300);
+    expect(FontWeight.w400.value, 400);
+    expect(FontWeight.w500.value, 500);
+    expect(FontWeight.w600.value, 600);
+    expect(FontWeight.w700.value, 700);
+    expect(FontWeight.w800.value, 800);
+    expect(FontWeight.w900.value, 900);
+  });
 }
 
 void testParagraphStyle() {
@@ -277,7 +289,7 @@ void testFontVariation() {
 }
 
 void main() {
-  testFontWeightLerp();
+  testFontWeight();
   testParagraphStyle();
   testTextStyle();
   testTextHeightBehavior();