Bumping to version 4 with first cut of bones.

lib/src/generated/bones/bone_base.dart

@@ -0,0 +1,41 @@
+/// Core automatically generated lib/src/generated/bones/bone_base.dart.
+/// Do not modify manually.
+
+import 'package:rive/src/generated/bones/skeletal_component_base.dart';
+import 'package:rive/src/generated/component_base.dart';
+import 'package:rive/src/generated/container_component_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
+import 'package:rive/src/rive_core/bones/skeletal_component.dart';
+
+abstract class BoneBase extends SkeletalComponent {
+  static const int typeKey = 40;
+  @override
+  int get coreType => BoneBase.typeKey;
+  @override
+  Set<int> get coreTypes => {
+        BoneBase.typeKey,
+        SkeletalComponentBase.typeKey,
+        TransformComponentBase.typeKey,
+        ContainerComponentBase.typeKey,
+        ComponentBase.typeKey
+      };
+
+  /// --------------------------------------------------------------------------
+  /// Length field with key 89.
+  double _length = 0;
+  static const int lengthPropertyKey = 89;
+  double get length => _length;
+
+  /// Change the [_length] field value.
+  /// [lengthChanged] will be invoked only if the field's value has changed.
+  set length(double value) {
+    if (_length == value) {
+      return;
+    }
+    double from = _length;
+    _length = value;
+    lengthChanged(from, value);
+  }
+
+  void lengthChanged(double from, double to);
+}

lib/src/generated/bones/root_bone_base.dart

@@ -0,0 +1,66 @@
+/// Core automatically generated lib/src/generated/bones/root_bone_base.dart.
+/// Do not modify manually.
+
+import 'package:rive/src/generated/bones/bone_base.dart';
+import 'package:rive/src/generated/bones/skeletal_component_base.dart';
+import 'package:rive/src/generated/component_base.dart';
+import 'package:rive/src/generated/container_component_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
+import 'package:rive/src/rive_core/bones/bone.dart';
+
+abstract class RootBoneBase extends Bone {
+  static const int typeKey = 41;
+  @override
+  int get coreType => RootBoneBase.typeKey;
+  @override
+  Set<int> get coreTypes => {
+        RootBoneBase.typeKey,
+        BoneBase.typeKey,
+        SkeletalComponentBase.typeKey,
+        TransformComponentBase.typeKey,
+        ContainerComponentBase.typeKey,
+        ComponentBase.typeKey
+      };
+
+  /// --------------------------------------------------------------------------
+  /// X field with key 90.
+  double _x = 0;
+  static const int xPropertyKey = 90;
+  @override
+  double get x => _x;
+
+  /// Change the [_x] field value.
+  /// [xChanged] will be invoked only if the field's value has changed.
+  @override
+  set x(double value) {
+    if (_x == value) {
+      return;
+    }
+    double from = _x;
+    _x = value;
+    xChanged(from, value);
+  }
+
+  void xChanged(double from, double to);
+
+  /// --------------------------------------------------------------------------
+  /// Y field with key 91.
+  double _y = 0;
+  static const int yPropertyKey = 91;
+  @override
+  double get y => _y;
+
+  /// Change the [_y] field value.
+  /// [yChanged] will be invoked only if the field's value has changed.
+  @override
+  set y(double value) {
+    if (_y == value) {
+      return;
+    }
+    double from = _y;
+    _y = value;
+    yChanged(from, value);
+  }
+
+  void yChanged(double from, double to);
+}

lib/src/generated/bones/skeletal_component_base.dart

@@ -0,0 +1,21 @@
+/// Core automatically generated
+/// lib/src/generated/bones/skeletal_component_base.dart.
+/// Do not modify manually.
+
+import 'package:rive/src/generated/component_base.dart';
+import 'package:rive/src/generated/container_component_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
+import 'package:rive/src/rive_core/transform_component.dart';
+
+abstract class SkeletalComponentBase extends TransformComponent {
+  static const int typeKey = 39;
+  @override
+  int get coreType => SkeletalComponentBase.typeKey;
+  @override
+  Set<int> get coreTypes => {
+        SkeletalComponentBase.typeKey,
+        TransformComponentBase.typeKey,
+        ContainerComponentBase.typeKey,
+        ComponentBase.typeKey
+      };
+}

lib/src/generated/drawable_base.dart

@@ -4,6 +4,7 @@
 import 'package:rive/src/generated/component_base.dart';
 import 'package:rive/src/generated/container_component_base.dart';
 import 'package:rive/src/generated/node_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/node.dart';
 
 abstract class DrawableBase extends Node {
@@ -14,6 +15,7 @@ abstract class DrawableBase extends Node {
   Set<int> get coreTypes => {
         DrawableBase.typeKey,
         NodeBase.typeKey,
+        TransformComponentBase.typeKey,
         ContainerComponentBase.typeKey,
         ComponentBase.typeKey
       };

lib/src/generated/node_base.dart

@@ -3,24 +3,31 @@
 
 import 'package:rive/src/generated/component_base.dart';
 import 'package:rive/src/generated/container_component_base.dart';
-import 'package:rive/src/rive_core/container_component.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
+import 'package:rive/src/rive_core/transform_component.dart';
 
-abstract class NodeBase extends ContainerComponent {
+abstract class NodeBase extends TransformComponent {
   static const int typeKey = 2;
   @override
   int get coreType => NodeBase.typeKey;
   @override
-  Set<int> get coreTypes =>
-      {NodeBase.typeKey, ContainerComponentBase.typeKey, ComponentBase.typeKey};
+  Set<int> get coreTypes => {
+        NodeBase.typeKey,
+        TransformComponentBase.typeKey,
+        ContainerComponentBase.typeKey,
+        ComponentBase.typeKey
+      };
 
   /// --------------------------------------------------------------------------
   /// X field with key 13.
   double _x = 0;
   static const int xPropertyKey = 13;
+  @override
   double get x => _x;
 
   /// Change the [_x] field value.
   /// [xChanged] will be invoked only if the field's value has changed.
+  @override
   set x(double value) {
     if (_x == value) {
       return;
@@ -36,10 +43,12 @@ abstract class NodeBase extends ContainerComponent {
   /// Y field with key 14.
   double _y = 0;
   static const int yPropertyKey = 14;
+  @override
   double get y => _y;
 
   /// Change the [_y] field value.
   /// [yChanged] will be invoked only if the field's value has changed.
+  @override
   set y(double value) {
     if (_y == value) {
       return;
@@ -50,80 +59,4 @@ abstract class NodeBase extends ContainerComponent {
   }
 
   void yChanged(double from, double to);
-
-  /// --------------------------------------------------------------------------
-  /// Rotation field with key 15.
-  double _rotation = 0;
-  static const int rotationPropertyKey = 15;
-  double get rotation => _rotation;
-
-  /// Change the [_rotation] field value.
-  /// [rotationChanged] will be invoked only if the field's value has changed.
-  set rotation(double value) {
-    if (_rotation == value) {
-      return;
-    }
-    double from = _rotation;
-    _rotation = value;
-    rotationChanged(from, value);
-  }
-
-  void rotationChanged(double from, double to);
-
-  /// --------------------------------------------------------------------------
-  /// ScaleX field with key 16.
-  double _scaleX = 1;
-  static const int scaleXPropertyKey = 16;
-  double get scaleX => _scaleX;
-
-  /// Change the [_scaleX] field value.
-  /// [scaleXChanged] will be invoked only if the field's value has changed.
-  set scaleX(double value) {
-    if (_scaleX == value) {
-      return;
-    }
-    double from = _scaleX;
-    _scaleX = value;
-    scaleXChanged(from, value);
-  }
-
-  void scaleXChanged(double from, double to);
-
-  /// --------------------------------------------------------------------------
-  /// ScaleY field with key 17.
-  double _scaleY = 1;
-  static const int scaleYPropertyKey = 17;
-  double get scaleY => _scaleY;
-
-  /// Change the [_scaleY] field value.
-  /// [scaleYChanged] will be invoked only if the field's value has changed.
-  set scaleY(double value) {
-    if (_scaleY == value) {
-      return;
-    }
-    double from = _scaleY;
-    _scaleY = value;
-    scaleYChanged(from, value);
-  }
-
-  void scaleYChanged(double from, double to);
-
-  /// --------------------------------------------------------------------------
-  /// Opacity field with key 18.
-  double _opacity = 1;
-  static const int opacityPropertyKey = 18;
-  double get opacity => _opacity;
-
-  /// Change the [_opacity] field value.
-  /// [opacityChanged] will be invoked only if the field's value has changed.
-  set opacity(double value) {
-    if (_opacity == value) {
-      return;
-    }
-    double from = _opacity;
-    _opacity = value;
-    opacityChanged(from, value);
-  }
-
-  void opacityChanged(double from, double to);
 }

lib/src/generated/rive_core_context.dart

@@ -17,6 +17,8 @@ import 'package:rive/src/generated/animation/keyframe_draw_order_value_base.dart
 import 'package:rive/src/generated/animation/linear_animation_base.dart';
 import 'package:rive/src/generated/artboard_base.dart';
 import 'package:rive/src/generated/backboard_base.dart';
+import 'package:rive/src/generated/bones/bone_base.dart';
+import 'package:rive/src/generated/bones/root_bone_base.dart';
 import 'package:rive/src/generated/component_base.dart';
 import 'package:rive/src/generated/drawable_base.dart';
 import 'package:rive/src/generated/node_base.dart';
@@ -39,6 +41,7 @@ import 'package:rive/src/generated/shapes/rectangle_base.dart';
 import 'package:rive/src/generated/shapes/shape_base.dart';
 import 'package:rive/src/generated/shapes/straight_vertex_base.dart';
 import 'package:rive/src/generated/shapes/triangle_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/animation/animation.dart';
 import 'package:rive/src/rive_core/animation/cubic_interpolator.dart';
 import 'package:rive/src/rive_core/animation/keyed_object.dart';
@@ -50,6 +53,8 @@ import 'package:rive/src/rive_core/animation/keyframe_draw_order_value.dart';
 import 'package:rive/src/rive_core/animation/linear_animation.dart';
 import 'package:rive/src/rive_core/artboard.dart';
 import 'package:rive/src/rive_core/backboard.dart';
+import 'package:rive/src/rive_core/bones/bone.dart';
+import 'package:rive/src/rive_core/bones/root_bone.dart';
 import 'package:rive/src/rive_core/node.dart';
 import 'package:rive/src/rive_core/shapes/cubic_asymmetric_vertex.dart';
 import 'package:rive/src/rive_core/shapes/cubic_detached_vertex.dart';
@@ -128,6 +133,10 @@ class RiveCoreContext {
         return Artboard();
       case BackboardBase.typeKey:
         return Backboard();
+      case BoneBase.typeKey:
+        return Bone();
+      case RootBoneBase.typeKey:
+        return RootBone();
       default:
         return null;
     }
@@ -324,6 +333,26 @@ class RiveCoreContext {
           object.fillRule = value;
         }
         break;
+      case TransformComponentBase.rotationPropertyKey:
+        if (object is TransformComponentBase && value is double) {
+          object.rotation = value;
+        }
+        break;
+      case TransformComponentBase.scaleXPropertyKey:
+        if (object is TransformComponentBase && value is double) {
+          object.scaleX = value;
+        }
+        break;
+      case TransformComponentBase.scaleYPropertyKey:
+        if (object is TransformComponentBase && value is double) {
+          object.scaleY = value;
+        }
+        break;
+      case TransformComponentBase.opacityPropertyKey:
+        if (object is TransformComponentBase && value is double) {
+          object.opacity = value;
+        }
+        break;
       case NodeBase.xPropertyKey:
         if (object is NodeBase && value is double) {
           object.x = value;
@@ -334,26 +363,6 @@ class RiveCoreContext {
           object.y = value;
         }
         break;
-      case NodeBase.rotationPropertyKey:
-        if (object is NodeBase && value is double) {
-          object.rotation = value;
-        }
-        break;
-      case NodeBase.scaleXPropertyKey:
-        if (object is NodeBase && value is double) {
-          object.scaleX = value;
-        }
-        break;
-      case NodeBase.scaleYPropertyKey:
-        if (object is NodeBase && value is double) {
-          object.scaleY = value;
-        }
-        break;
-      case NodeBase.opacityPropertyKey:
-        if (object is NodeBase && value is double) {
-          object.opacity = value;
-        }
-        break;
       case DrawableBase.drawOrderPropertyKey:
         if (object is DrawableBase && value is int) {
           object.drawOrder = value;
@@ -474,6 +483,21 @@ class RiveCoreContext {
           object.originY = value;
         }
         break;
+      case BoneBase.lengthPropertyKey:
+        if (object is BoneBase && value is double) {
+          object.length = value;
+        }
+        break;
+      case RootBoneBase.xPropertyKey:
+        if (object is RootBoneBase && value is double) {
+          object.x = value;
+        }
+        break;
+      case RootBoneBase.yPropertyKey:
+        if (object is RootBoneBase && value is double) {
+          object.y = value;
+        }
+        break;
     }
   }
 
@@ -519,12 +543,12 @@ class RiveCoreContext {
       case LinearGradientBase.opacityPropertyKey:
       case StrokeBase.thicknessPropertyKey:
       case GradientStopBase.positionPropertyKey:
+      case TransformComponentBase.rotationPropertyKey:
+      case TransformComponentBase.scaleXPropertyKey:
+      case TransformComponentBase.scaleYPropertyKey:
+      case TransformComponentBase.opacityPropertyKey:
       case NodeBase.xPropertyKey:
       case NodeBase.yPropertyKey:
-      case NodeBase.rotationPropertyKey:
-      case NodeBase.scaleXPropertyKey:
-      case NodeBase.scaleYPropertyKey:
-      case NodeBase.opacityPropertyKey:
       case PathVertexBase.xPropertyKey:
       case PathVertexBase.yPropertyKey:
       case StraightVertexBase.radiusPropertyKey:
@@ -546,6 +570,9 @@ class RiveCoreContext {
       case ArtboardBase.yPropertyKey:
       case ArtboardBase.originXPropertyKey:
       case ArtboardBase.originYPropertyKey:
+      case BoneBase.lengthPropertyKey:
+      case RootBoneBase.xPropertyKey:
+      case RootBoneBase.yPropertyKey:
         return doubleType;
       case KeyFrameColorBase.valuePropertyKey:
       case SolidColorBase.colorValuePropertyKey:
@@ -641,18 +668,18 @@ class RiveCoreContext {
         return (object as StrokeBase).thickness;
       case GradientStopBase.positionPropertyKey:
         return (object as GradientStopBase).position;
+      case TransformComponentBase.rotationPropertyKey:
+        return (object as TransformComponentBase).rotation;
+      case TransformComponentBase.scaleXPropertyKey:
+        return (object as TransformComponentBase).scaleX;
+      case TransformComponentBase.scaleYPropertyKey:
+        return (object as TransformComponentBase).scaleY;
+      case TransformComponentBase.opacityPropertyKey:
+        return (object as TransformComponentBase).opacity;
       case NodeBase.xPropertyKey:
         return (object as NodeBase).x;
       case NodeBase.yPropertyKey:
         return (object as NodeBase).y;
-      case NodeBase.rotationPropertyKey:
-        return (object as NodeBase).rotation;
-      case NodeBase.scaleXPropertyKey:
-        return (object as NodeBase).scaleX;
-      case NodeBase.scaleYPropertyKey:
-        return (object as NodeBase).scaleY;
-      case NodeBase.opacityPropertyKey:
-        return (object as NodeBase).opacity;
       case PathVertexBase.xPropertyKey:
         return (object as PathVertexBase).x;
       case PathVertexBase.yPropertyKey:
@@ -695,6 +722,12 @@ class RiveCoreContext {
         return (object as ArtboardBase).originX;
       case ArtboardBase.originYPropertyKey:
         return (object as ArtboardBase).originY;
+      case BoneBase.lengthPropertyKey:
+        return (object as BoneBase).length;
+      case RootBoneBase.xPropertyKey:
+        return (object as RootBoneBase).x;
+      case RootBoneBase.yPropertyKey:
+        return (object as RootBoneBase).y;
     }
     return 0.0;
   }
@@ -836,24 +869,24 @@ class RiveCoreContext {
       case GradientStopBase.positionPropertyKey:
         (object as GradientStopBase).position = value;
         break;
+      case TransformComponentBase.rotationPropertyKey:
+        (object as TransformComponentBase).rotation = value;
+        break;
+      case TransformComponentBase.scaleXPropertyKey:
+        (object as TransformComponentBase).scaleX = value;
+        break;
+      case TransformComponentBase.scaleYPropertyKey:
+        (object as TransformComponentBase).scaleY = value;
+        break;
+      case TransformComponentBase.opacityPropertyKey:
+        (object as TransformComponentBase).opacity = value;
+        break;
       case NodeBase.xPropertyKey:
         (object as NodeBase).x = value;
         break;
       case NodeBase.yPropertyKey:
         (object as NodeBase).y = value;
         break;
-      case NodeBase.rotationPropertyKey:
-        (object as NodeBase).rotation = value;
-        break;
-      case NodeBase.scaleXPropertyKey:
-        (object as NodeBase).scaleX = value;
-        break;
-      case NodeBase.scaleYPropertyKey:
-        (object as NodeBase).scaleY = value;
-        break;
-      case NodeBase.opacityPropertyKey:
-        (object as NodeBase).opacity = value;
-        break;
       case PathVertexBase.xPropertyKey:
         (object as PathVertexBase).x = value;
         break;
@@ -917,6 +950,15 @@ class RiveCoreContext {
       case ArtboardBase.originYPropertyKey:
         (object as ArtboardBase).originY = value;
         break;
+      case BoneBase.lengthPropertyKey:
+        (object as BoneBase).length = value;
+        break;
+      case RootBoneBase.xPropertyKey:
+        (object as RootBoneBase).x = value;
+        break;
+      case RootBoneBase.yPropertyKey:
+        (object as RootBoneBase).y = value;
+        break;
     }
   }
 

lib/src/generated/shapes/ellipse_base.dart

@@ -6,6 +6,7 @@ import 'package:rive/src/generated/container_component_base.dart';
 import 'package:rive/src/generated/node_base.dart';
 import 'package:rive/src/generated/shapes/parametric_path_base.dart';
 import 'package:rive/src/generated/shapes/path_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/shapes/parametric_path.dart';
 
 abstract class EllipseBase extends ParametricPath {
@@ -18,6 +19,7 @@ abstract class EllipseBase extends ParametricPath {
         ParametricPathBase.typeKey,
         PathBase.typeKey,
         NodeBase.typeKey,
+        TransformComponentBase.typeKey,
         ContainerComponentBase.typeKey,
         ComponentBase.typeKey
       };

lib/src/generated/shapes/parametric_path_base.dart

@@ -6,6 +6,7 @@ import 'package:rive/src/generated/component_base.dart';
 import 'package:rive/src/generated/container_component_base.dart';
 import 'package:rive/src/generated/node_base.dart';
 import 'package:rive/src/generated/shapes/path_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/shapes/path.dart';
 
 abstract class ParametricPathBase extends Path {
@@ -17,6 +18,7 @@ abstract class ParametricPathBase extends Path {
         ParametricPathBase.typeKey,
         PathBase.typeKey,
         NodeBase.typeKey,
+        TransformComponentBase.typeKey,
         ContainerComponentBase.typeKey,
         ComponentBase.typeKey
       };

lib/src/generated/shapes/path_base.dart

@@ -4,6 +4,7 @@
 import 'package:rive/src/generated/component_base.dart';
 import 'package:rive/src/generated/container_component_base.dart';
 import 'package:rive/src/generated/node_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/node.dart';
 
 abstract class PathBase extends Node {
@@ -14,6 +15,7 @@ abstract class PathBase extends Node {
   Set<int> get coreTypes => {
         PathBase.typeKey,
         NodeBase.typeKey,
+        TransformComponentBase.typeKey,
         ContainerComponentBase.typeKey,
         ComponentBase.typeKey
       };

lib/src/generated/shapes/points_path_base.dart

@@ -5,6 +5,7 @@ import 'package:rive/src/generated/component_base.dart';
 import 'package:rive/src/generated/container_component_base.dart';
 import 'package:rive/src/generated/node_base.dart';
 import 'package:rive/src/generated/shapes/path_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/shapes/path.dart';
 
 abstract class PointsPathBase extends Path {
@@ -16,6 +17,7 @@ abstract class PointsPathBase extends Path {
         PointsPathBase.typeKey,
         PathBase.typeKey,
         NodeBase.typeKey,
+        TransformComponentBase.typeKey,
         ContainerComponentBase.typeKey,
         ComponentBase.typeKey
       };

lib/src/generated/shapes/rectangle_base.dart

@@ -6,6 +6,7 @@ import 'package:rive/src/generated/container_component_base.dart';
 import 'package:rive/src/generated/node_base.dart';
 import 'package:rive/src/generated/shapes/parametric_path_base.dart';
 import 'package:rive/src/generated/shapes/path_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/shapes/parametric_path.dart';
 
 abstract class RectangleBase extends ParametricPath {
@@ -18,6 +19,7 @@ abstract class RectangleBase extends ParametricPath {
         ParametricPathBase.typeKey,
         PathBase.typeKey,
         NodeBase.typeKey,
+        TransformComponentBase.typeKey,
         ContainerComponentBase.typeKey,
         ComponentBase.typeKey
       };

lib/src/generated/shapes/shape_base.dart

@@ -5,6 +5,7 @@ import 'package:rive/src/generated/component_base.dart';
 import 'package:rive/src/generated/container_component_base.dart';
 import 'package:rive/src/generated/drawable_base.dart';
 import 'package:rive/src/generated/node_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/drawable.dart';
 
 abstract class ShapeBase extends Drawable {
@@ -16,6 +17,7 @@ abstract class ShapeBase extends Drawable {
         ShapeBase.typeKey,
         DrawableBase.typeKey,
         NodeBase.typeKey,
+        TransformComponentBase.typeKey,
         ContainerComponentBase.typeKey,
         ComponentBase.typeKey
       };

lib/src/generated/shapes/triangle_base.dart

@@ -6,6 +6,7 @@ import 'package:rive/src/generated/container_component_base.dart';
 import 'package:rive/src/generated/node_base.dart';
 import 'package:rive/src/generated/shapes/parametric_path_base.dart';
 import 'package:rive/src/generated/shapes/path_base.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
 import 'package:rive/src/rive_core/shapes/parametric_path.dart';
 
 abstract class TriangleBase extends ParametricPath {
@@ -18,6 +19,7 @@ abstract class TriangleBase extends ParametricPath {
         ParametricPathBase.typeKey,
         PathBase.typeKey,
         NodeBase.typeKey,
+        TransformComponentBase.typeKey,
         ContainerComponentBase.typeKey,
         ComponentBase.typeKey
       };

lib/src/generated/transform_component_base.dart

@@ -0,0 +1,95 @@
+/// Core automatically generated
+/// lib/src/generated/transform_component_base.dart.
+/// Do not modify manually.
+
+import 'package:rive/src/generated/component_base.dart';
+import 'package:rive/src/generated/container_component_base.dart';
+import 'package:rive/src/rive_core/container_component.dart';
+
+abstract class TransformComponentBase extends ContainerComponent {
+  static const int typeKey = 38;
+  @override
+  int get coreType => TransformComponentBase.typeKey;
+  @override
+  Set<int> get coreTypes => {
+        TransformComponentBase.typeKey,
+        ContainerComponentBase.typeKey,
+        ComponentBase.typeKey
+      };
+
+  /// --------------------------------------------------------------------------
+  /// Rotation field with key 15.
+  double _rotation = 0;
+  static const int rotationPropertyKey = 15;
+  double get rotation => _rotation;
+
+  /// Change the [_rotation] field value.
+  /// [rotationChanged] will be invoked only if the field's value has changed.
+  set rotation(double value) {
+    if (_rotation == value) {
+      return;
+    }
+    double from = _rotation;
+    _rotation = value;
+    rotationChanged(from, value);
+  }
+
+  void rotationChanged(double from, double to);
+
+  /// --------------------------------------------------------------------------
+  /// ScaleX field with key 16.
+  double _scaleX = 1;
+  static const int scaleXPropertyKey = 16;
+  double get scaleX => _scaleX;
+
+  /// Change the [_scaleX] field value.
+  /// [scaleXChanged] will be invoked only if the field's value has changed.
+  set scaleX(double value) {
+    if (_scaleX == value) {
+      return;
+    }
+    double from = _scaleX;
+    _scaleX = value;
+    scaleXChanged(from, value);
+  }
+
+  void scaleXChanged(double from, double to);
+
+  /// --------------------------------------------------------------------------
+  /// ScaleY field with key 17.
+  double _scaleY = 1;
+  static const int scaleYPropertyKey = 17;
+  double get scaleY => _scaleY;
+
+  /// Change the [_scaleY] field value.
+  /// [scaleYChanged] will be invoked only if the field's value has changed.
+  set scaleY(double value) {
+    if (_scaleY == value) {
+      return;
+    }
+    double from = _scaleY;
+    _scaleY = value;
+    scaleYChanged(from, value);
+  }
+
+  void scaleYChanged(double from, double to);
+
+  /// --------------------------------------------------------------------------
+  /// Opacity field with key 18.
+  double _opacity = 1;
+  static const int opacityPropertyKey = 18;
+  double get opacity => _opacity;
+
+  /// Change the [_opacity] field value.
+  /// [opacityChanged] will be invoked only if the field's value has changed.
+  set opacity(double value) {
+    if (_opacity == value) {
+      return;
+    }
+    double from = _opacity;
+    _opacity = value;
+    opacityChanged(from, value);
+  }
+
+  void opacityChanged(double from, double to);
+}

lib/src/rive_core/bones/bone.dart

@@ -0,0 +1,49 @@
+import 'package:rive/src/generated/bones/bone_base.dart';
+export 'package:rive/src/generated/bones/bone_base.dart';
+
+typedef bool BoneCallback(Bone bone);
+
+class Bone extends BoneBase {
+  @override
+  void lengthChanged(double from, double to) {
+    for (final child in children) {
+      if (child.coreType == BoneBase.typeKey) {
+        (child as Bone).markTransformDirty();
+      }
+    }
+  }
+
+  Bone get firstChildBone {
+    for (final child in children) {
+      if (child.coreType == BoneBase.typeKey) {
+        return child as Bone;
+      }
+    }
+    return null;
+  }
+
+  bool forEachBone(BoneCallback callback) {
+    for (final child in children) {
+      if (child.coreType == BoneBase.typeKey) {
+        if (!callback(child as Bone)) {
+          return false;
+        }
+      }
+    }
+    return true;
+  }
+
+  @override
+  double get x => (parent as Bone).length;
+  @override
+  set x(double value) {
+    throw UnsupportedError('not expected to set x on a bone.');
+  }
+
+  @override
+  double get y => 0;
+  @override
+  set y(double value) {
+    throw UnsupportedError('not expected to set y on a bone.');
+  }
+}

lib/src/rive_core/bones/root_bone.dart

@@ -0,0 +1,14 @@
+import 'package:rive/src/generated/bones/root_bone_base.dart';
+export 'package:rive/src/generated/bones/root_bone_base.dart';
+
+class RootBone extends RootBoneBase {
+  @override
+  void xChanged(double from, double to) {
+    markTransformDirty();
+  }
+
+  @override
+  void yChanged(double from, double to) {
+    markTransformDirty();
+  }
+}

lib/src/rive_core/bones/skeletal_component.dart

@@ -0,0 +1,4 @@
+import 'package:rive/src/generated/bones/skeletal_component_base.dart';
+export 'package:rive/src/generated/bones/skeletal_component_base.dart';
+
+abstract class SkeletalComponent extends SkeletalComponentBase {}

lib/src/rive_core/math/aabb.dart

@@ -48,8 +48,13 @@ class AABB {
     var transformedPoint = transform == null
         ? point
         : Vec2D.transformMat2D(Vec2D(), point, transform);
-    var x = transformedPoint[0];
-    var y = transformedPoint[1];
+    expandToPoint(transformedPoint);
+    return transformedPoint;
+  }
+
+  void expandToPoint(Vec2D point) {
+    var x = point[0];
+    var y = point[1];
     if (x < _buffer[0]) {
       _buffer[0] = x;
     }
@@ -62,7 +67,6 @@ class AABB {
     if (y > _buffer[3]) {
       _buffer[3] = y;
     }
-    return transformedPoint;
   }
 
   AABB.fromMinMax(Vec2D min, Vec2D max) {

lib/src/rive_core/node.dart

@@ -1,98 +1,14 @@
-import 'package:flutter/foundation.dart';
-import 'package:rive/src/rive_core/component_dirt.dart';
-import 'package:rive/src/rive_core/container_component.dart';
 import 'package:rive/src/rive_core/math/aabb.dart';
-import 'package:rive/src/rive_core/math/mat2d.dart';
 import 'package:rive/src/rive_core/math/vec2d.dart';
 import 'package:rive/src/generated/node_base.dart';
-import 'package:meta/meta.dart';
 export 'package:rive/src/generated/node_base.dart';
 
 class Node extends NodeBase {
-  final Mat2D transform = Mat2D();
-  final Mat2D worldTransform = Mat2D();
-  double _renderOpacity = 0;
-  double get renderOpacity => _renderOpacity;
-  @override
-  void update(int dirt) {
-    if (dirt & ComponentDirt.transform != 0) {
-      updateTransform();
-    }
-    if (dirt & ComponentDirt.worldTransform != 0) {
-      updateWorldTransform();
-    }
-  }
-
-  Vec2D get translation => Vec2D.fromValues(x, y);
-  Vec2D get worldTranslation =>
-      Vec2D.fromValues(worldTransform[4], worldTransform[5]);
   set translation(Vec2D pos) {
     x = pos[0];
     y = pos[1];
   }
 
-  Vec2D get scale => Vec2D.fromValues(scaleX, scaleY);
-  set scale(Vec2D value) {
-    scaleX = value[0];
-    scaleY = value[1];
-  }
-
-  void updateTransform() {
-    if (rotation != 0) {
-      Mat2D.fromRotation(transform, rotation);
-    } else {
-      Mat2D.identity(transform);
-    }
-    transform[4] = x;
-    transform[5] = y;
-    Mat2D.scaleByValues(transform, scaleX, scaleY);
-  }
-
-  double get childOpacity => _renderOpacity;
-  @mustCallSuper
-  void updateWorldTransform() {
-    _renderOpacity = opacity;
-    if (parent is Node) {
-      var parentNode = parent as Node;
-      _renderOpacity *= parentNode.childOpacity;
-      Mat2D.multiply(worldTransform, parentNode.worldTransform, transform);
-    } else {
-      Mat2D.copy(worldTransform, transform);
-    }
-  }
-
-  void calculateWorldTransform() {
-    var parent = this.parent;
-    final chain = <Node>[this];
-    while (parent != null) {
-      if (parent is Node) {
-        chain.insert(0, parent);
-      }
-      parent = parent.parent;
-    }
-    for (final item in chain) {
-      item.updateTransform();
-      item.updateWorldTransform();
-    }
-  }
-
-  @override
-  void buildDependencies() {
-    super.buildDependencies();
-    parent?.addDependent(this);
-  }
-
-  void markTransformDirty() {
-    if (!addDirt(ComponentDirt.transform)) {
-      return;
-    }
-    markWorldTransformDirty();
-  }
-
-  void markWorldTransformDirty() {
-    addDirt(ComponentDirt.worldTransform, recurse: true);
-  }
-
   @override
   void xChanged(double from, double to) {
     markTransformDirty();
@@ -103,31 +19,5 @@ class Node extends NodeBase {
     markTransformDirty();
   }
 
-  @override
-  void rotationChanged(double from, double to) {
-    markTransformDirty();
-  }
-
-  @override
-  void scaleXChanged(double from, double to) {
-    markTransformDirty();
-  }
-
-  @override
-  void scaleYChanged(double from, double to) {
-    markTransformDirty();
-  }
-
-  @override
-  void opacityChanged(double from, double to) {
-    markTransformDirty();
-  }
-
-  @override
-  void parentChanged(ContainerComponent from, ContainerComponent to) {
-    super.parentChanged(from, to);
-    markWorldTransformDirty();
-  }
-
   AABB get localBounds => AABB.fromValues(x, y, x, y);
 }

lib/src/rive_core/runtime/runtime_header.dart

@@ -4,7 +4,7 @@ import 'package:rive/src/utilities/binary_buffer/binary_reader.dart';
 import 'exceptions/rive_format_error_exception.dart';
 
 class RuntimeHeader {
-  static const int majorVersion = 3;
+  static const int majorVersion = 4;
   static const int minorVersion = 0;
   static const String fingerprint = 'RIVE';
   final int ownerId;

lib/src/rive_core/transform_component.dart

@@ -0,0 +1,118 @@
+import 'package:flutter/foundation.dart';
+import 'package:rive/src/rive_core/component_dirt.dart';
+import 'package:rive/src/rive_core/container_component.dart';
+import 'package:rive/src/rive_core/math/mat2d.dart';
+import 'package:rive/src/rive_core/math/vec2d.dart';
+import 'package:rive/src/generated/transform_component_base.dart';
+export 'package:rive/src/generated/transform_component_base.dart';
+
+abstract class TransformComponent extends TransformComponentBase {
+  double _renderOpacity = 0;
+  double get renderOpacity => _renderOpacity;
+  final Mat2D worldTransform = Mat2D();
+  final Mat2D transform = Mat2D();
+  Vec2D get translation => Vec2D.fromValues(x, y);
+  Vec2D get worldTranslation =>
+      Vec2D.fromValues(worldTransform[4], worldTransform[5]);
+  double get x;
+  double get y;
+  set x(double value);
+  set y(double value);
+  @override
+  void update(int dirt) {
+    if (dirt & ComponentDirt.transform != 0) {
+      updateTransform();
+    }
+    if (dirt & ComponentDirt.worldTransform != 0) {
+      updateWorldTransform();
+    }
+  }
+
+  void updateTransform() {
+    if (rotation != 0) {
+      Mat2D.fromRotation(transform, rotation);
+    } else {
+      Mat2D.identity(transform);
+    }
+    transform[4] = x;
+    transform[5] = y;
+    Mat2D.scaleByValues(transform, scaleX, scaleY);
+  }
+
+  double get childOpacity => _renderOpacity;
+  Vec2D get scale => Vec2D.fromValues(scaleX, scaleY);
+  set scale(Vec2D value) {
+    scaleX = value[0];
+    scaleY = value[1];
+  }
+
+  @mustCallSuper
+  void updateWorldTransform() {
+    _renderOpacity = opacity;
+    if (parent is TransformComponent) {
+      var parentNode = parent as TransformComponent;
+      _renderOpacity *= parentNode.childOpacity;
+      Mat2D.multiply(worldTransform, parentNode.worldTransform, transform);
+    } else {
+      Mat2D.copy(worldTransform, transform);
+    }
+  }
+
+  void calculateWorldTransform() {
+    var parent = this.parent;
+    final chain = <TransformComponent>[this];
+    while (parent != null) {
+      if (parent is TransformComponent) {
+        chain.insert(0, parent);
+      }
+      parent = parent.parent;
+    }
+    for (final item in chain) {
+      item.updateTransform();
+      item.updateWorldTransform();
+    }
+  }
+
+  @override
+  void buildDependencies() {
+    super.buildDependencies();
+    parent?.addDependent(this);
+  }
+
+  void markTransformDirty() {
+    if (!addDirt(ComponentDirt.transform)) {
+      return;
+    }
+    markWorldTransformDirty();
+  }
+
+  void markWorldTransformDirty() {
+    addDirt(ComponentDirt.worldTransform, recurse: true);
+  }
+
+  @override
+  void rotationChanged(double from, double to) {
+    markTransformDirty();
+  }
+
+  @override
+  void scaleXChanged(double from, double to) {
+    markTransformDirty();
+  }
+
+  @override
+  void scaleYChanged(double from, double to) {
+    markTransformDirty();
+  }
+
+  @override
+  void opacityChanged(double from, double to) {
+    markTransformDirty();
+  }
+
+  @override
+  void parentChanged(ContainerComponent from, ContainerComponent to) {
+    super.parentChanged(from, to);
+    markWorldTransformDirty();
+  }
+}

lib/src/utilities/binary_buffer/binary_reader.dart

@@ -6,8 +6,12 @@ var _utf8Decoder = const Utf8Decoder();
 class BinaryReader {
   final ByteData buffer;
   final Endian endian;
-  int _readIndex = 0;
-  int get position => _readIndex;
+
+  /// TODO: remove setter for readIndex when we remove _readVarInt from
+  /// core_double_type.dart
+  int readIndex = 0;
+
+  int get position => readIndex;
 
   BinaryReader(this.buffer, {this.endian = Endian.little});
 
@@ -15,65 +19,65 @@ class BinaryReader {
       : buffer =
             ByteData.view(list.buffer, list.offsetInBytes, list.lengthInBytes);
 
-  bool get isEOF => _readIndex >= buffer.lengthInBytes;
+  bool get isEOF => readIndex >= buffer.lengthInBytes;
 
   double readFloat32() {
-    double value = buffer.getFloat32(_readIndex, endian);
-    _readIndex += 4;
+    double value = buffer.getFloat32(readIndex, endian);
+    readIndex += 4;
     return value;
   }
 
   double readFloat64() {
-    double value = buffer.getFloat64(_readIndex, endian);
-    _readIndex += 8;
+    double value = buffer.getFloat64(readIndex, endian);
+    readIndex += 8;
     return value;
   }
 
   int readInt8() {
-    int value = buffer.getInt8(_readIndex);
-    _readIndex += 1;
+    int value = buffer.getInt8(readIndex);
+    readIndex += 1;
     return value;
   }
 
   int readUint8() {
-    int value = buffer.getUint8(_readIndex);
-    _readIndex += 1;
+    int value = buffer.getUint8(readIndex);
+    readIndex += 1;
     return value;
   }
 
   int readInt16() {
-    int value = buffer.getInt16(_readIndex, endian);
-    _readIndex += 2;
+    int value = buffer.getInt16(readIndex, endian);
+    readIndex += 2;
     return value;
   }
 
   int readUint16() {
-    int value = buffer.getUint16(_readIndex, endian);
-    _readIndex += 2;
+    int value = buffer.getUint16(readIndex, endian);
+    readIndex += 2;
     return value;
   }
 
   int readInt32() {
-    int value = buffer.getInt32(_readIndex, endian);
-    _readIndex += 4;
+    int value = buffer.getInt32(readIndex, endian);
+    readIndex += 4;
     return value;
   }
 
   int readUint32() {
-    int value = buffer.getUint32(_readIndex, endian);
-    _readIndex += 4;
+    int value = buffer.getUint32(readIndex, endian);
+    readIndex += 4;
     return value;
   }
 
   int readInt64() {
-    int value = buffer.getInt64(_readIndex, endian);
-    _readIndex += 8;
+    int value = buffer.getInt64(readIndex, endian);
+    readIndex += 8;
     return value;
   }
 
   int readUint64() {
-    int value = buffer.getUint64(_readIndex, endian);
-    _readIndex += 8;
+    int value = buffer.getUint64(readIndex, endian);
+    readIndex += 8;
     return value;
   }
 
@@ -83,7 +87,7 @@ class BinaryReader {
     int result = 0;
     int shift = 0;
     while (true) {
-      int byte = buffer.getUint8(_readIndex++) & 0xff;
+      int byte = buffer.getUint8(readIndex++) & 0xff;
       result |= (byte & 0x7f) << shift;
       if ((byte & 0x80) == 0) break;
       shift += 7;
@@ -97,15 +101,15 @@ class BinaryReader {
   String readString({bool explicitLength = true}) {
     int length = explicitLength ? readVarUint() : buffer.lengthInBytes;
     String value = _utf8Decoder.convert(Uint8List.view(
-        buffer.buffer, buffer.offsetInBytes + _readIndex, length));
-    _readIndex += length;
+        buffer.buffer, buffer.offsetInBytes + readIndex, length));
+    readIndex += length;
     return value;
   }
 
   Uint8List read(int length, [bool allocNew = false]) {
-    var view = Uint8List.view(
-        buffer.buffer, buffer.offsetInBytes + _readIndex, length);
-    _readIndex += length;
+    var view =
+        Uint8List.view(buffer.buffer, buffer.offsetInBytes + readIndex, length);
+    readIndex += length;
     return allocNew ? Uint8List.fromList(view) : view;
   }
 }

lib/src/utilities/tops.dart

@@ -17,3 +17,12 @@ Set<T> tops<T extends Parentable<T>>(Iterable<T> parentables) {
   }
   return tips;
 }
+
+bool isChildOf<T extends Parentable<T>>(T child, Iterable<T> parents) {
+  for (var parent = child; parent != null; parent = parent.parent) {
+    if (parents.contains(parent)) {
+      return true;
+    }
+  }
+  return false;
+}