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lib/src/api/node_json_converter.dart

@@ -72,6 +72,7 @@ class NodeJsonConverter implements JsonConverter<BaseNode?, Map> {
       'progressBar': ProgressBarNode.fromJson,
       'variance': VarianceNode.fromJson,
       'listView': ListViewNode.fromJson,
+      'pageView': PageViewNode.fromJson,
     };
   }
 

lib/src/api/nodes/base_node.dart

@@ -378,6 +378,23 @@ abstract class BaseNode with SerializableMixin, EquatableMixin {
   @JsonKey(includeFromJson: false, includeToJson: false)
   bool get supportsPadding => false;
 
+  /// Width of the node in fraction of the parent's width. widthFactor of 0.5
+  /// means that the node will be half the width of the parent.
+  double? widthFactor;
+
+  /// Height of the node in fraction of the parent's height. heightFactor of 0.5
+  /// means that the node will be half the height of the parent.
+  double? heightFactor;
+
+  /// Whether the node is sized in fraction of the parent's size.
+  bool get isFractionallySized => widthFactor != null || heightFactor != null;
+
+  /// Whether the node's width is sized in fraction of the parent's width.
+  bool get isFractionallySizedHorizontally => widthFactor != null;
+
+  /// Whether the node's height is sized in fraction of the parent's height.
+  bool get isFractionallySizedVertically => heightFactor != null;
+
   /// Default constructor of this class.
   BaseNode({
     required this.id,
@@ -398,6 +415,8 @@ abstract class BaseNode with SerializableMixin, EquatableMixin {
     this.aspectRatioLock = false,
     this.positioningMode = PositioningMode.align,
     this.parentID = '',
+    this.widthFactor,
+    this.heightFactor,
   })  : _basicBoxLocal = basicBoxLocal,
         _rotationDegrees = rotationDegrees,
         globalRotationDegrees = rotationDegrees,