feat: Meta widget (#54)

lib/src/attributes/index.dart

@@ -28,3 +28,4 @@ export 'slider_attributes.dart';
 export 'fitted_box_attributes.dart';
 export 'switch_attributes.dart';
 export 'subtree_attributes.dart';
+export 'meta_attributes.dart';

lib/src/attributes/meta_attributes.dart

@@ -0,0 +1,22 @@
+import 'package:duit_kernel/duit_kernel.dart';
+import 'package:flutter_duit/src/ui/models/attended_model.dart';
+
+final class MetaAttributes extends AttendedModel<Map<String, dynamic>>
+    implements DuitAttributes<MetaAttributes> {
+  MetaAttributes({
+    required super.value,
+  });
+
+  factory MetaAttributes.fromJson(Map<String, dynamic> json) {
+    return MetaAttributes(
+      value: json,
+    );
+  }
+
+  @override
+  MetaAttributes copyWith(MetaAttributes other) {
+    return MetaAttributes(
+      value: other.value,
+    );
+  }
+}

lib/src/ui/models/element.dart

@@ -632,6 +632,25 @@ base class DuitElement<T> extends TreeElement<T> with WidgetFabric {
           child: child,
           controlled: controlled,
         );
+      case ElementType.meta:
+        final child = await DuitElement.fromJson(json["child"], driver);
+
+        return MetaUiElement(
+          type: type,
+          id: id,
+          attributes: attributes,
+          viewController: _createAndAttachController(
+            id,
+            controlled,
+            attributes,
+            serverAction,
+            driver,
+            type,
+            tag,
+          ),
+          child: child,
+          controlled: controlled,
+        );
       case ElementType.lifecycleStateListener:
         final child = await DuitElement.fromJson(json["child"], driver);
 
@@ -763,6 +782,24 @@ base class DuitElement<T> extends TreeElement<T> with WidgetFabric {
 }
 
 //<editor-fold desc="Inherited models">
+final class MetaUiElement<T> extends DuitElement<T>
+    implements SingleChildLayout {
+  //<editor-fold desc="Properties and ctor">
+  @override
+  DuitElement child;
+
+  MetaUiElement({
+    required super.type,
+    required super.id,
+    required super.controlled,
+    required super.viewController,
+    required super.attributes,
+    required this.child,
+  });
+
+//</editor-fold>
+}
+
 final class SingleChildScrollviewUiElement<T> extends DuitElement<T>
     implements SingleChildLayout {
   //<editor-fold desc="Properties and ctor">

lib/src/ui/models/element_type.dart

@@ -33,4 +33,5 @@ final class ElementType {
   static const fittedBox = "FittedBox";
   static const switchW = "Switch";
   static const subtree = "Subtree";
+  static const meta = "Meta";
 }

lib/src/ui/widgets/index.dart

@@ -30,3 +30,4 @@ export 'slider.dart';
 export 'fitted_box.dart';
 export 'switch.dart';
 export 'component.dart';
+export 'meta.dart';

lib/src/ui/widgets/meta.dart

@@ -0,0 +1,32 @@
+import "package:duit_kernel/duit_kernel.dart";
+import "package:flutter/material.dart";
+import "package:flutter_duit/flutter_duit.dart";
+import "package:flutter_duit/src/attributes/index.dart";
+
+class DuitMetaWidget extends StatefulWidget {
+  final Widget child;
+  final UIElementController controller;
+
+  const DuitMetaWidget({
+    super.key,
+    required this.child,
+    required this.controller,
+  });
+
+  @override
+  State<DuitMetaWidget> createState() => _DuitMetaWidgetState();
+}
+
+class _DuitMetaWidgetState extends State<DuitMetaWidget>
+    with ViewControllerChangeListener<DuitMetaWidget, MetaAttributes> {
+  @override
+  void initState() {
+    attachStateToController(widget.controller);
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return widget.child;
+  }
+}

lib/src/ui/widgets/widget_fabric.dart

@@ -371,6 +371,14 @@ mixin WidgetFabric {
           controller: it.viewController!,
           child: child,
         );
+      case ElementType.meta:
+        final it = model as MetaUiElement;
+        final child = getWidgetFromElement(it.child);
+
+        return DuitMetaWidget(
+          controller: it.viewController!,
+          child: child,
+        );
       case ElementType.empty:
         return const DuitEmptyView();
       case ElementType.custom:

lib/src/utils/attribute_parser.dart

@@ -94,7 +94,10 @@ final class AttributeParser implements AttributeParserBase {
       ElementType.slider => SliderAttributes.fromJson(json ?? {}),
       ElementType.fittedBox => FittedBoxAttributes.fromJson(json ?? {}),
       ElementType.switchW => SwitchAttributes.fromJson(json ?? {}),
-      ElementType.subtree || ElementType.component => SubtreeAttributes.fromJson(json ?? {}),
+      ElementType.subtree ||
+      ElementType.component =>
+        SubtreeAttributes.fromJson(json ?? {}),
+      ElementType.meta => MetaAttributes.fromJson(json ?? {}),
       ElementType.empty || String() => EmptyAttributes(),
     };