Make FontWeight an enum, Remove unused text classes

ci/licenses_golden/licenses_flutter

@@ -1873,12 +1873,10 @@ ORIGIN: ../../../flutter/lib/ui/text/asset_manager_font_provider.cc + ../../../f
 ORIGIN: ../../../flutter/lib/ui/text/asset_manager_font_provider.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/text/font_collection.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/text/font_collection.h + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/lib/ui/text/line_metrics.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/text/paragraph.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/text/paragraph.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/text/paragraph_builder.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/text/paragraph_builder.h + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/lib/ui/text/text_box.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/ui.dart + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/ui_benchmarks.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/lib/ui/ui_dart_state.cc + ../../../flutter/LICENSE
@@ -4605,12 +4603,10 @@ FILE: ../../../flutter/lib/ui/text/asset_manager_font_provider.cc
 FILE: ../../../flutter/lib/ui/text/asset_manager_font_provider.h
 FILE: ../../../flutter/lib/ui/text/font_collection.cc
 FILE: ../../../flutter/lib/ui/text/font_collection.h
-FILE: ../../../flutter/lib/ui/text/line_metrics.h
 FILE: ../../../flutter/lib/ui/text/paragraph.cc
 FILE: ../../../flutter/lib/ui/text/paragraph.h
 FILE: ../../../flutter/lib/ui/text/paragraph_builder.cc
 FILE: ../../../flutter/lib/ui/text/paragraph_builder.h
-FILE: ../../../flutter/lib/ui/text/text_box.h
 FILE: ../../../flutter/lib/ui/ui.dart
 FILE: ../../../flutter/lib/ui/ui_benchmarks.cc
 FILE: ../../../flutter/lib/ui/ui_dart_state.cc

lib/ui/BUILD.gn

@@ -123,12 +123,10 @@ source_set("ui") {
     "text/asset_manager_font_provider.h",
     "text/font_collection.cc",
     "text/font_collection.h",
-    "text/line_metrics.h",
     "text/paragraph.cc",
     "text/paragraph.h",
     "text/paragraph_builder.cc",
     "text/paragraph_builder.h",
-    "text/text_box.h",
     "ui_dart_state.cc",
     "ui_dart_state.h",
     "volatile_path_tracker.cc",

lib/ui/text.dart

@@ -13,53 +13,45 @@ enum FontStyle {
 }
 
 /// The thickness of the glyphs used to draw the text
-class FontWeight {
-  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;
-
+enum FontWeight {
   /// Thin, the least thick
-  static const FontWeight w100 = FontWeight._(0, 100);
+  w100._(100),
 
   /// Extra-light
-  static const FontWeight w200 = FontWeight._(1, 200);
+  w200._(200),
 
   /// Light
-  static const FontWeight w300 = FontWeight._(2, 300);
+  w300._(300),
 
   /// Normal / regular / plain
-  static const FontWeight w400 = FontWeight._(3, 400);
+  w400._(400),
 
   /// Medium
-  static const FontWeight w500 = FontWeight._(4, 500);
+  w500._(500),
 
   /// Semi-bold
-  static const FontWeight w600 = FontWeight._(5, 600);
+  w600._(600),
 
   /// Bold
-  static const FontWeight w700 = FontWeight._(6, 700);
+  w700._(700),
 
   /// Extra-bold
-  static const FontWeight w800 = FontWeight._(7, 800);
+  w800._(800),
 
   /// Black, the most thick
-  static const FontWeight w900 = FontWeight._(8, 900);
+  w900._(900);
+
+  const FontWeight._(this.value);
+
+  /// The thickness value of this font weight.
+  final int value;
 
   /// The default font weight.
   static const FontWeight normal = w400;
 
   /// A commonly used font weight that is heavier than normal.
   static const FontWeight bold = w700;
 
-  /// A list of all the font weights.
-  static const List<FontWeight> values = <FontWeight>[
-    w100, w200, w300, w400, w500, w600, w700, w800, w900
-  ];
-
   /// Linearly interpolates between two font weights.
   ///
   /// Rather than using fractional weights, the interpolation rounds to the
@@ -87,21 +79,6 @@ class FontWeight {
     }
     return values[_lerpInt((a ?? normal).index, (b ?? normal).index, t).round().clamp(0, 8)];
   }
-
-  @override
-  String toString() {
-    return const <int, String>{
-      0: 'FontWeight.w100',
-      1: 'FontWeight.w200',
-      2: 'FontWeight.w300',
-      3: 'FontWeight.w400',
-      4: 'FontWeight.w500',
-      5: 'FontWeight.w600',
-      6: 'FontWeight.w700',
-      7: 'FontWeight.w800',
-      8: 'FontWeight.w900',
-    }[index]!;
-  }
 }
 
 /// A feature tag and value that affect the selection of glyphs in a font.

lib/ui/text/paragraph.h

@@ -8,8 +8,6 @@
 #include "flutter/fml/message_loop.h"
 #include "flutter/lib/ui/dart_wrapper.h"
 #include "flutter/lib/ui/painting/canvas.h"
-#include "flutter/lib/ui/text/line_metrics.h"
-#include "flutter/lib/ui/text/text_box.h"
 #include "flutter/third_party/txt/src/txt/paragraph.h"
 
 namespace flutter {