Implements StyledNode

lib/src/models/documents/nodes/block.dart

@@ -13,7 +13,7 @@ import 'node.dart';
 /// - Text Alignment
 /// - Text Direction
 /// - Code Block
-class Block extends Container<Line?> {
+class Block extends Container<Line?> implements StyledNode {
   /// Creates new unmounted [Block].
   @override
   Node newInstance() => Block();

lib/src/models/documents/nodes/leaf.dart

@@ -7,7 +7,7 @@ import 'line.dart';
 import 'node.dart';
 
 /// A leaf in Quill document tree.
-abstract class Leaf extends Node {
+abstract class Leaf extends Node implements StyledNode {
   /// Creates a new [Leaf] with specified [data].
   factory Leaf(Object data) {
     if (data is Embeddable) {

lib/src/models/documents/nodes/line.dart

@@ -17,7 +17,7 @@ import 'node.dart';
 ///
 /// When a line contains an embed, it fully occupies the line, no other embeds
 /// or text nodes are allowed.
-class Line extends Container<Leaf?> {
+class Line extends Container<Leaf?> implements StyledNode {
   @override
   Leaf get defaultChild => Text();
 

lib/src/models/documents/nodes/node.dart

@@ -127,33 +127,6 @@ abstract class StyledNode implements Node {
   Style get style;
 }
 
-/// Mixin used by nodes that wish to implement [StyledNode] interface.
-abstract class StyledNodeMixin implements StyledNode {
-  @override
-  Style get style => _style;
-  @override
-  Style _style = Style();
-
-  /// Applies style [attribute] to this node.
-  @override
-  void applyAttribute(Attribute attribute) {
-    _style = _style.merge(attribute);
-  }
-
-  /// Applies new style [value] to this node. Provided [value] is merged
-  /// into current style.
-  @override
-  void applyStyle(Style value) {
-    _style = _style.mergeAll(value);
-  }
-
-  /// Clears style of this node.
-  @override
-  void clearStyle() {
-    _style = Style();
-  }
-}
-
 /// Root node of document tree.
 class Root extends Container<Container<Node?>> {
   @override