feat!: Dart SDK compatibility (#77)

# Description
This PR makes this package compatible with the Dart SDK. In order to
achieve this I changed 3 things:
- Replace `dart:ui`'s Color with a simple ColorData class
- Replaced `Rect` from `flame` with `Rectangle` from `dart:math`
- Replaced `flutter_test` with `test` package

The `ColorData` class is used excatly once for which I prepared a
flame_tiled PR (however I need to wait until this is merged right)
including conversion extensions.

No `Rectangle` attribute is ever read in `flame_tiled`, evenso `flame`
already contains conversion extensions!

## Checklist
- [x] The title of my PR starts with a [Conventional Commit] prefix
(`fix:`, `feat:`, `docs:` etc).
- [x] I have read the [Contributor Guide] and followed the process
outlined for submitting PRs.
--> `melos run analyze` fails due to `XmlData.value` however I think
this requires another issue/PR
- [x] I have updated/added tests for ALL new/updated/fixed
functionality.
- [x] I have updated/added relevant documentation in `docs` and added
dartdoc comments with `///`.
- [x] I have updated/added relevant examples in `examples`.
  --> I don't think there are any exmaples necessary for this

## Breaking Change
- [x] Yes, this is a breaking change.
- [ ] No, this is *not* a breaking change.

I think this should result in a minor version bump to 0.11.0 to indicate
these breaking changes!

In order to achieve dart comaptibilty only two things changed:
- Color: Custom data class --> `flame_tiled` contains a conversion
extension
- Rect: Instead using `dart:math`'s Rectangle --> Use `flame`'s
`toRect()` method to convert

## Related Issues
- #69

---------

Co-authored-by: benni-tec <me@benni-tec.de>
Co-authored-by: Lukas Klingsbo <lukas.klingsbo@gmail.com>

packages/tiled/lib/src/chunk.dart

@@ -1,4 +1,4 @@
-part of '../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/common/color.dart

@@ -0,0 +1,53 @@
+import 'package:meta/meta.dart';
+
+/// Basic data class holding a Color in ARGB format.
+/// This can be converted to dart:ui's Color using the flame_tiled package
+@immutable
+class ColorData {
+  static int _sub(int hex, int index) => (hex >> index * 8) & 0x000000ff;
+
+  final int _hex;
+
+  int get alpha => _sub(_hex, 3);
+
+  int get red => _sub(_hex, 2);
+
+  int get green => _sub(_hex, 1);
+
+  int get blue => _sub(_hex, 0);
+
+  /// Parses the Color from an int using the lower 32-bits and tiled's format:
+  /// 0xaarrggbb
+  const ColorData.hex(this._hex);
+
+  const ColorData.rgb(int red, int green, int blue, [int alpha = 255])
+      : assert(red >= 0 && red <= 255),
+        assert(green >= 0 && green <= 255),
+        assert(blue >= 0 && blue <= 255),
+        assert(alpha >= 0 && alpha <= 255),
+        _hex = (alpha << 3 * 8) +
+            (red << 2 * 8) +
+            (green << 1 * 8) +
+            (blue << 0 * 8);
+
+  const ColorData.argb(int alpha, int red, int green, int blue)
+      : assert(red >= 0 && red <= 255),
+        assert(green >= 0 && green <= 255),
+        assert(blue >= 0 && blue <= 255),
+        assert(alpha >= 0 && alpha <= 255),
+        _hex = (alpha << 3 * 8) +
+            (red << 2 * 8) +
+            (green << 1 * 8) +
+            (blue << 0 * 8);
+
+  @override
+  bool operator ==(Object other) {
+    if (other is! ColorData) {
+      return false;
+    }
+    return _hex == other._hex;
+  }
+
+  @override
+  int get hashCode => _hex.hashCode;
+}

packages/tiled/lib/src/common/enums.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 enum MapOrientation { orthogonal, isometric, staggered, hexagonal }
 

packages/tiled/lib/src/common/flips.dart

@@ -1,5 +1,3 @@
-part of '../../tiled.dart';
-
 class Flips {
   final bool horizontally;
   final bool vertically;

packages/tiled/lib/src/common/frame.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/common/gid.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// A [Gid], Global Tile ID is a Tiled concept to represent the tiles inside
 /// int matrices. This wrapper is used by [Layer] and [Chunk] to provide

packages/tiled/lib/src/common/point.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/common/property.dart

@@ -1,4 +1,6 @@
-part of '../../tiled.dart';
+import 'package:collection/collection.dart';
+import 'package:tiled/tiled.dart';
+import 'package:xml/xml.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:
@@ -37,7 +39,10 @@ class Property<T> {
       case PropertyType.color:
         return ColorProperty(
           name: name,
-          value: parser.getColor('value', defaults: const Color(0x00000000)),
+          value: parser.getColor(
+            'value',
+            defaults: const ColorData.hex(0x00000000),
+          ),
           hexValue: parser.getString('value', defaults: '#00000000'),
         );
 
@@ -156,7 +161,7 @@ class ObjectProperty extends Property<int> {
 }
 
 /// [value] is the color
-class ColorProperty extends Property<Color> {
+class ColorProperty extends Property<ColorData> {
   final String hexValue;
 
   ColorProperty({

packages/tiled/lib/src/common/tiled_image.dart

@@ -1,4 +1,5 @@
-part of '../../tiled.dart';
+import 'package:meta/meta.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/editor_setting/chunk_size.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/editor_setting/editor_setting.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/editor_setting/export.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/layer.dart

@@ -1,4 +1,9 @@
-part of '../tiled.dart';
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:archive/archive.dart';
+import 'package:tiled/tiled.dart';
+import 'package:xml/xml.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:
@@ -77,11 +82,11 @@ abstract class Layer {
   /// any graphics drawn by this layer or any child layers (optional).
   String? tintColorHex;
 
-  /// [Color] that is multiplied with any graphics drawn by this layer or any
-  /// child layers (optional).
+  /// [ColorData] that is multiplied with any graphics drawn by this layer or
+  /// any child layers (optional).
   ///
   /// Parsed from [tintColorHex], will be null if parsing fails for any reason.
-  Color? tintColor;
+  ColorData? tintColor;
 
   /// The opacity of the layer as a value from 0 to 1. Defaults to 1.
   double opacity;
@@ -420,7 +425,7 @@ class TileLayer extends Layer {
 }
 
 class ObjectGroup extends Layer {
-  static const defaultColor = Color.fromARGB(255, 160, 160, 164);
+  static const defaultColor = ColorData.rgb(160, 160, 164);
   static const defaultColorHex = '%a0a0a4';
 
   /// topdown (default) or index (indexOrder).
@@ -433,12 +438,12 @@ class ObjectGroup extends Layer {
   /// this group. (defaults to gray (“#a0a0a4”))
   String colorHex;
 
-  /// [Color] used to display the objects in this group.
+  /// [ColorData] used to display the objects in this group.
   /// (defaults to gray (“#a0a0a4”))
   ///
   /// Parsed from [colorHex], will be fallback to [defaultColor] if parsing
   /// fails for any reason.
-  Color color;
+  ColorData color;
 
   ObjectGroup({
     required super.name,
@@ -474,11 +479,11 @@ class ImageLayer extends Layer {
   /// (optional).
   String? transparentColorHex;
 
-  /// [Color] to be rendered as transparent (optional).
+  /// [ColorData] to be rendered as transparent (optional).
   ///
   /// Parsed from [transparentColorHex], will be null if parsing fails for any
   /// reason.
-  Color? transparentColor;
+  ColorData? transparentColor;
 
   /// Whether or not to repeat the image on the X-axis
   bool repeatX;

packages/tiled/lib/src/objects/text.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/objects/tiled_object.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/parser.dart

@@ -1,4 +1,5 @@
-part of '../tiled.dart';
+import 'package:tiled/tiled.dart';
+import 'package:xml/xml.dart';
 
 class ParsingException implements Exception {
   final String name;
@@ -206,7 +207,7 @@ abstract class Parser {
     return result;
   }
 
-  Color? getColorOrNull(String name, {Color? defaults}) {
+  ColorData? getColorOrNull(String name, {ColorData? defaults}) {
     final tiledColor = getStringOrNull(name);
 
     // Tiled colors are stored as either ARGB or RGB hex values, so we can
@@ -221,13 +222,13 @@ abstract class Parser {
     }
 
     if (colorValue != null) {
-      return Color(colorValue);
+      return ColorData.hex(colorValue);
     } else {
       return defaults;
     }
   }
 
-  Color getColor(String name, {Color? defaults}) {
+  ColorData getColor(String name, {ColorData? defaults}) {
     final result = getColorOrNull(name, defaults: defaults);
     if (result == null) {
       throw ParsingException(name, null, 'Missing required color field');

packages/tiled/lib/src/template.dart

@@ -1,4 +1,4 @@
-part of '../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/tile_map_parser.dart

@@ -1,4 +1,7 @@
-part of '../tiled.dart';
+import 'dart:convert';
+
+import 'package:tiled/tiled.dart';
+import 'package:xml/xml.dart';
 
 class TileMapParser {
   static TiledMap parseJson(String json) {

packages/tiled/lib/src/tiled_map.dart

@@ -1,4 +1,8 @@
-part of '../tiled.dart';
+import 'dart:collection';
+
+import 'package:collection/collection.dart';
+import 'package:tiled/tiled.dart';
+import 'package:xml/xml.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:
@@ -74,12 +78,12 @@ class TiledMap {
   /// behind all other layers (optional).
   String? backgroundColorHex;
 
-  /// [Color] to be rendered as a solid color behind all other layers
+  /// [ColorData] to be rendered as a solid color behind all other layers
   /// (optional).
   ///
   /// Parsed from [backgroundColorHex], will be null if parsing fails for any
   /// reason.
-  Color? backgroundColor;
+  ColorData? backgroundColor;
 
   int compressionLevel;
 

packages/tiled/lib/src/tileset/grid.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/tileset/terrain.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/tileset/tile.dart

@@ -1,4 +1,6 @@
-part of '../../tiled.dart';
+import 'dart:math';
+
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:
@@ -27,7 +29,7 @@ class Tile {
   List<int?> terrain;
 
   TiledImage? image;
-  Rect? imageRect;
+  Rectangle? imageRect;
   Layer? objectGroup;
   List<Frame> animation;
   CustomProperties properties;
@@ -66,7 +68,7 @@ class Tile {
                   .toList() ??
               [],
           image: parser.getSingleChildOrNullAs('image', TiledImage.parse),
-          imageRect: Rect.fromLTWH(
+          imageRect: Rectangle(
             parser.getDoubleOrNull('x') ?? 0,
             parser.getDoubleOrNull('y') ?? 0,
             parser.getDoubleOrNull('width') ?? 0,

packages/tiled/lib/src/tileset/tile_offset.dart

@@ -1,4 +1,4 @@
-part of '../../tiled.dart';
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/tileset/tileset.dart

@@ -1,4 +1,6 @@
-part of '../../tiled.dart';
+import 'dart:math';
+
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:
@@ -230,7 +232,7 @@ class Tileset {
     final tiles = <Tile>[];
 
     for (var i = 0; i < tileCount; ++i) {
-      Rect? imageRect;
+      Rectangle? imageRect;
 
       if (columns != null &&
           columns != 0 &&
@@ -239,7 +241,7 @@ class Tileset {
         final x = (i % columns) * tileWidth;
         final y = i ~/ columns * tileHeight;
 
-        imageRect = Rect.fromLTWH(
+        imageRect = Rectangle(
           x.toDouble(),
           y.toDouble(),
           tileWidth.toDouble(),

packages/tiled/lib/src/tileset/wang/wang_color.dart

@@ -1,4 +1,4 @@
-part of '../../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/tileset/wang/wang_set.dart

@@ -1,4 +1,4 @@
-part of '../../../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/tileset/wang/wang_tile.dart

@@ -1,4 +1,6 @@
-part of '../../../tiled.dart';
+import 'dart:typed_data';
+
+import 'package:tiled/src/parser.dart';
 
 /// Below is Tiled's documentation about how this structure is represented
 /// on XML files:

packages/tiled/lib/src/tsx_provider.dart

@@ -1,4 +1,4 @@
-part of '../tiled.dart';
+import 'package:tiled/tiled.dart';
 
 /// abstract class to be implemented for an external tileset data provider.
 abstract class TsxProvider {