Feat: Adding Support Placeholder

examples/mirai_gallery/assets/json/home_screen.json

@@ -1555,6 +1555,41 @@
       }
     }
   },
+
+  {
+    "type": "listTile",
+    "leading": {
+      "type": "icon",
+      "iconType": "material",
+      "icon": "apartment"
+    },
+
+    "title": {
+      "type": "text",
+      "data": "Placeholder",
+      "style": {
+        "fontSize": 21
+      }
+    },
+    "subtitle": {
+      "type": "text",
+      "data": "A Material Design Mirai Placeholder widget",
+      "style": {
+        "fontSize": 12
+      }
+    },
+    "isThreeLine": true,
+    "onTap": {
+      "actionType": "navigate",
+      "navigationStyle": "push",
+      "widgetJson": {
+        "type": "exampleScreen",
+        "assetPath": "assets/json/placeholder_example.json"
+      }
+    }
+  },
+
+
   {
     "type": "sizedBox",
     "height": 24.0

examples/mirai_gallery/assets/json/placeholder_example.json

@@ -0,0 +1,37 @@
+{
+  "type": "scaffold",
+  "appBar": {
+    "type": "appBar",
+    "title": {
+      "type": "text",
+      "data": "Placeholder"
+    }
+  },
+  "body": {
+    "type": "listView",
+    "shrinkWrap": true,
+    "children": [
+      {
+        "type": "sizedBox",
+        "height": 25
+      },
+      {
+        "type": "placeholder",
+        "color": "#455A64",
+        "strokeWidth": 2.0,
+        "fallbackHeight": 400.0,
+        "fallbackWidth": 400.0
+      },
+      {
+        "type": "sizedBox",
+        "height": 25
+      },
+      {
+        "color": "#672BFF",
+        "type": "placeholder",
+        "strokeWidth": 5.0,
+        "fallbackHeight": 100.0
+      }
+    ]
+  }
+}

packages/mirai/lib/src/framework/mirai.dart

@@ -91,6 +91,7 @@ class Mirai {
     const MiraiRadioGroupParser(),
     const MiraiSliderParser(),
     const MiraiOpacityParser(),
+    const MiraiPlaceholderParser(),
   ];
 
   static final _actionParsers = <MiraiActionParser>[

packages/mirai/lib/src/parsers/mirai_placeholder/mirai_placeholder.dart

@@ -0,0 +1,20 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+export 'package:mirai/src/parsers/mirai_placeholder/mirai_placeholder_parser.dart';
+
+part 'mirai_placeholder.freezed.dart';
+part 'mirai_placeholder.g.dart';
+
+@freezed
+class MiraiPlaceholder with _$MiraiPlaceholder {
+  const factory MiraiPlaceholder({
+    @Default(2.0) double fallbackWidth,
+    @Default(400.0) double fallbackHeight,
+    @Default(400.0) double strokeWidth,
+    @Default('#455A64') String color,
+    Map<String, dynamic>? child,
+  }) = _MiraiPlaceholder;
+
+  factory MiraiPlaceholder.fromJson(Map<String, dynamic> json) =>
+      _$MiraiPlaceholderFromJson(json);
+}

packages/mirai/lib/src/parsers/mirai_placeholder/mirai_placeholder.freezed.dart

@@ -0,0 +1,265 @@
+// coverage:ignore-file
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint
+// ignore_for_file: unused_element, deprecated_member_use, deprecated_member_use_from_same_package, use_function_type_syntax_for_parameters, unnecessary_const, avoid_init_to_null, invalid_override_different_default_values_named, prefer_expression_function_bodies, annotate_overrides, invalid_annotation_target, unnecessary_question_mark
+
+part of 'mirai_placeholder.dart';
+
+// **************************************************************************
+// FreezedGenerator
+// **************************************************************************
+
+T _$identity<T>(T value) => value;
+
+final _privateConstructorUsedError = UnsupportedError(
+    'It seems like you constructed your class using `MyClass._()`. This constructor is only meant to be used by freezed and you are not supposed to need it nor use it.\nPlease check the documentation here for more information: https://github.com/rrousselGit/freezed#adding-getters-and-methods-to-our-models');
+
+MiraiPlaceholder _$MiraiPlaceholderFromJson(Map<String, dynamic> json) {
+  return _MiraiPlaceholder.fromJson(json);
+}
+
+/// @nodoc
+mixin _$MiraiPlaceholder {
+  double get fallbackWidth => throw _privateConstructorUsedError;
+  double get fallbackHeight => throw _privateConstructorUsedError;
+  double get strokeWidth => throw _privateConstructorUsedError;
+  String get color => throw _privateConstructorUsedError;
+  Map<String, dynamic>? get child => throw _privateConstructorUsedError;
+
+  /// Serializes this MiraiPlaceholder to a JSON map.
+  Map<String, dynamic> toJson() => throw _privateConstructorUsedError;
+
+  /// Create a copy of MiraiPlaceholder
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  $MiraiPlaceholderCopyWith<MiraiPlaceholder> get copyWith =>
+      throw _privateConstructorUsedError;
+}
+
+/// @nodoc
+abstract class $MiraiPlaceholderCopyWith<$Res> {
+  factory $MiraiPlaceholderCopyWith(
+          MiraiPlaceholder value, $Res Function(MiraiPlaceholder) then) =
+      _$MiraiPlaceholderCopyWithImpl<$Res, MiraiPlaceholder>;
+  @useResult
+  $Res call(
+      {double fallbackWidth,
+      double fallbackHeight,
+      double strokeWidth,
+      String color,
+      Map<String, dynamic>? child});
+}
+
+/// @nodoc
+class _$MiraiPlaceholderCopyWithImpl<$Res, $Val extends MiraiPlaceholder>
+    implements $MiraiPlaceholderCopyWith<$Res> {
+  _$MiraiPlaceholderCopyWithImpl(this._value, this._then);
+
+  // ignore: unused_field
+  final $Val _value;
+  // ignore: unused_field
+  final $Res Function($Val) _then;
+
+  /// Create a copy of MiraiPlaceholder
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? fallbackWidth = null,
+    Object? fallbackHeight = null,
+    Object? strokeWidth = null,
+    Object? color = null,
+    Object? child = freezed,
+  }) {
+    return _then(_value.copyWith(
+      fallbackWidth: null == fallbackWidth
+          ? _value.fallbackWidth
+          : fallbackWidth // ignore: cast_nullable_to_non_nullable
+              as double,
+      fallbackHeight: null == fallbackHeight
+          ? _value.fallbackHeight
+          : fallbackHeight // ignore: cast_nullable_to_non_nullable
+              as double,
+      strokeWidth: null == strokeWidth
+          ? _value.strokeWidth
+          : strokeWidth // ignore: cast_nullable_to_non_nullable
+              as double,
+      color: null == color
+          ? _value.color
+          : color // ignore: cast_nullable_to_non_nullable
+              as String,
+      child: freezed == child
+          ? _value.child
+          : child // ignore: cast_nullable_to_non_nullable
+              as Map<String, dynamic>?,
+    ) as $Val);
+  }
+}
+
+/// @nodoc
+abstract class _$$MiraiPlaceholderImplCopyWith<$Res>
+    implements $MiraiPlaceholderCopyWith<$Res> {
+  factory _$$MiraiPlaceholderImplCopyWith(_$MiraiPlaceholderImpl value,
+          $Res Function(_$MiraiPlaceholderImpl) then) =
+      __$$MiraiPlaceholderImplCopyWithImpl<$Res>;
+  @override
+  @useResult
+  $Res call(
+      {double fallbackWidth,
+      double fallbackHeight,
+      double strokeWidth,
+      String color,
+      Map<String, dynamic>? child});
+}
+
+/// @nodoc
+class __$$MiraiPlaceholderImplCopyWithImpl<$Res>
+    extends _$MiraiPlaceholderCopyWithImpl<$Res, _$MiraiPlaceholderImpl>
+    implements _$$MiraiPlaceholderImplCopyWith<$Res> {
+  __$$MiraiPlaceholderImplCopyWithImpl(_$MiraiPlaceholderImpl _value,
+      $Res Function(_$MiraiPlaceholderImpl) _then)
+      : super(_value, _then);
+
+  /// Create a copy of MiraiPlaceholder
+  /// with the given fields replaced by the non-null parameter values.
+  @pragma('vm:prefer-inline')
+  @override
+  $Res call({
+    Object? fallbackWidth = null,
+    Object? fallbackHeight = null,
+    Object? strokeWidth = null,
+    Object? color = null,
+    Object? child = freezed,
+  }) {
+    return _then(_$MiraiPlaceholderImpl(
+      fallbackWidth: null == fallbackWidth
+          ? _value.fallbackWidth
+          : fallbackWidth // ignore: cast_nullable_to_non_nullable
+              as double,
+      fallbackHeight: null == fallbackHeight
+          ? _value.fallbackHeight
+          : fallbackHeight // ignore: cast_nullable_to_non_nullable
+              as double,
+      strokeWidth: null == strokeWidth
+          ? _value.strokeWidth
+          : strokeWidth // ignore: cast_nullable_to_non_nullable
+              as double,
+      color: null == color
+          ? _value.color
+          : color // ignore: cast_nullable_to_non_nullable
+              as String,
+      child: freezed == child
+          ? _value._child
+          : child // ignore: cast_nullable_to_non_nullable
+              as Map<String, dynamic>?,
+    ));
+  }
+}
+
+/// @nodoc
+@JsonSerializable()
+class _$MiraiPlaceholderImpl implements _MiraiPlaceholder {
+  const _$MiraiPlaceholderImpl(
+      {this.fallbackWidth = 2.0,
+      this.fallbackHeight = 400.0,
+      this.strokeWidth = 400.0,
+      this.color = '#455A64',
+      final Map<String, dynamic>? child})
+      : _child = child;
+
+  factory _$MiraiPlaceholderImpl.fromJson(Map<String, dynamic> json) =>
+      _$$MiraiPlaceholderImplFromJson(json);
+
+  @override
+  @JsonKey()
+  final double fallbackWidth;
+  @override
+  @JsonKey()
+  final double fallbackHeight;
+  @override
+  @JsonKey()
+  final double strokeWidth;
+  @override
+  @JsonKey()
+  final String color;
+  final Map<String, dynamic>? _child;
+  @override
+  Map<String, dynamic>? get child {
+    final value = _child;
+    if (value == null) return null;
+    if (_child is EqualUnmodifiableMapView) return _child;
+    // ignore: implicit_dynamic_type
+    return EqualUnmodifiableMapView(value);
+  }
+
+  @override
+  String toString() {
+    return 'MiraiPlaceholder(fallbackWidth: $fallbackWidth, fallbackHeight: $fallbackHeight, strokeWidth: $strokeWidth, color: $color, child: $child)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return identical(this, other) ||
+        (other.runtimeType == runtimeType &&
+            other is _$MiraiPlaceholderImpl &&
+            (identical(other.fallbackWidth, fallbackWidth) ||
+                other.fallbackWidth == fallbackWidth) &&
+            (identical(other.fallbackHeight, fallbackHeight) ||
+                other.fallbackHeight == fallbackHeight) &&
+            (identical(other.strokeWidth, strokeWidth) ||
+                other.strokeWidth == strokeWidth) &&
+            (identical(other.color, color) || other.color == color) &&
+            const DeepCollectionEquality().equals(other._child, _child));
+  }
+
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  int get hashCode => Object.hash(runtimeType, fallbackWidth, fallbackHeight,
+      strokeWidth, color, const DeepCollectionEquality().hash(_child));
+
+  /// Create a copy of MiraiPlaceholder
+  /// with the given fields replaced by the non-null parameter values.
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  @override
+  @pragma('vm:prefer-inline')
+  _$$MiraiPlaceholderImplCopyWith<_$MiraiPlaceholderImpl> get copyWith =>
+      __$$MiraiPlaceholderImplCopyWithImpl<_$MiraiPlaceholderImpl>(
+          this, _$identity);
+
+  @override
+  Map<String, dynamic> toJson() {
+    return _$$MiraiPlaceholderImplToJson(
+      this,
+    );
+  }
+}
+
+abstract class _MiraiPlaceholder implements MiraiPlaceholder {
+  const factory _MiraiPlaceholder(
+      {final double fallbackWidth,
+      final double fallbackHeight,
+      final double strokeWidth,
+      final String color,
+      final Map<String, dynamic>? child}) = _$MiraiPlaceholderImpl;
+
+  factory _MiraiPlaceholder.fromJson(Map<String, dynamic> json) =
+      _$MiraiPlaceholderImpl.fromJson;
+
+  @override
+  double get fallbackWidth;
+  @override
+  double get fallbackHeight;
+  @override
+  double get strokeWidth;
+  @override
+  String get color;
+  @override
+  Map<String, dynamic>? get child;
+
+  /// Create a copy of MiraiPlaceholder
+  /// with the given fields replaced by the non-null parameter values.
+  @override
+  @JsonKey(includeFromJson: false, includeToJson: false)
+  _$$MiraiPlaceholderImplCopyWith<_$MiraiPlaceholderImpl> get copyWith =>
+      throw _privateConstructorUsedError;
+}