Revert "Make FontWeight an enum, Remove unused text classes" (flutter#44987)

Reverts flutter#44960

Failing on customer_testing:
https://ci.chromium.org/ui/p/flutter/builders/try/Mac%20customer_testing/59576/overview

Author: zanderso

ci/licenses_golden/licenses_flutter

@@ -1869,10 +1869,12 @@ 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
@@ -4596,10 +4598,12 @@ 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

@@ -123,10 +123,12 @@ 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

@@ -13,45 +13,53 @@ enum FontStyle {
 }
 
 /// The thickness of the glyphs used to draw the text
-enum FontWeight {
+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;
+
   /// Thin, the least thick
-  w100._(100),
+  static const FontWeight w100 = FontWeight._(0, 100);
 
   /// Extra-light
-  w200._(200),
+  static const FontWeight w200 = FontWeight._(1, 200);
 
   /// Light
-  w300._(300),
+  static const FontWeight w300 = FontWeight._(2, 300);
 
   /// Normal / regular / plain
-  w400._(400),
+  static const FontWeight w400 = FontWeight._(3, 400);
 
   /// Medium
-  w500._(500),
+  static const FontWeight w500 = FontWeight._(4, 500);
 
   /// Semi-bold
-  w600._(600),
+  static const FontWeight w600 = FontWeight._(5, 600);
 
   /// Bold
-  w700._(700),
+  static const FontWeight w700 = FontWeight._(6, 700);
 
   /// Extra-bold
-  w800._(800),
+  static const FontWeight w800 = FontWeight._(7, 800);
 
   /// Black, the most thick
-  w900._(900);
-
-  const FontWeight._(this.value);
-
-  /// The thickness value of this font weight.
-  final int value;
+  static const FontWeight w900 = FontWeight._(8, 900);
 
   /// 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
@@ -79,6 +87,21 @@ enum 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/line_metrics.h

@@ -0,0 +1,62 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef FLUTTER_LIB_UI_TEXT_LINE_METRICS_H_
+#define FLUTTER_LIB_UI_TEXT_LINE_METRICS_H_
+
+#include "third_party/dart/runtime/include/dart_api.h"
+#include "third_party/tonic/converter/dart_converter.h"
+
+namespace flutter {
+
+struct LineMetrics {
+  const bool* hard_break;
+
+  // The final computed ascent and descent for the line. This can be impacted by
+  // the strut, height, scaling, as well as outlying runs that are very tall.
+  //
+  // The top edge is `baseline - ascent` and the bottom edge is `baseline +
+  // descent`. Ascent and descent are provided as positive numbers. Raw numbers
+  // for specific runs of text can be obtained in run_metrics_map. These values
+  // are the cumulative metrics for the entire line.
+  const double* ascent;
+  const double* descent;
+  const double* unscaled_ascent;
+  // Height of the line.
+  const double* height;
+  // Width of the line.
+  const double* width;
+  // The left edge of the line. The right edge can be obtained with `left +
+  // width`
+  const double* left;
+  // The y position of the baseline for this line from the top of the paragraph.
+  const double* baseline;
+  // Zero indexed line number.
+  const size_t* line_number;
+
+  LineMetrics();
+
+  LineMetrics(const bool* hard_break,
+              const double* ascent,
+              const double* descent,
+              const double* unscaled_ascent,
+              const double* height,
+              const double* width,
+              const double* left,
+              const double* baseline,
+              const size_t* line_number)
+      : hard_break(hard_break),
+        ascent(ascent),
+        descent(descent),
+        unscaled_ascent(unscaled_ascent),
+        height(height),
+        width(width),
+        left(left),
+        baseline(baseline),
+        line_number(line_number) {}
+};
+
+}  // namespace flutter
+
+#endif  // FLUTTER_LIB_UI_TEXT_LINE_METRICS_H_

lib/ui/text/paragraph.h

@@ -8,6 +8,8 @@
 #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 {

lib/ui/text/text_box.h

@@ -0,0 +1,28 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef FLUTTER_LIB_UI_TEXT_TEXT_BOX_H_
+#define FLUTTER_LIB_UI_TEXT_TEXT_BOX_H_
+
+#include "third_party/dart/runtime/include/dart_api.h"
+#include "third_party/skia/include/core/SkRect.h"
+#include "third_party/tonic/converter/dart_converter.h"
+
+namespace flutter {
+
+enum class TextDirection {
+  rtl,
+  ltr,
+};
+
+struct TextBox {
+  SkRect rect;
+  TextDirection direction;
+
+  TextBox(SkRect r, TextDirection d) : rect(r), direction(d) {}
+};
+
+}  // namespace flutter
+
+#endif  // FLUTTER_LIB_UI_TEXT_TEXT_BOX_H_