chore: delete unused code

frontend/app_flowy/packages/flowy_editor/example/lib/plugin/image_node_widget.dart

@@ -33,8 +33,7 @@ class _ImageNodeWidget extends StatefulWidget {
   State<_ImageNodeWidget> createState() => __ImageNodeWidgetState();
 }
 
-class __ImageNodeWidgetState extends State<_ImageNodeWidget>
-    with Selectable, KeyboardEventsRespondable {
+class __ImageNodeWidgetState extends State<_ImageNodeWidget> with Selectable {
   Node get node => widget.node;
   EditorState get editorState => widget.editorState;
   String get src => widget.node.attributes['image_src'] as String;
@@ -62,17 +61,6 @@ class __ImageNodeWidgetState extends State<_ImageNodeWidget>
     return null;
   }
 
-  @override
-  KeyEventResult onKeyDown(RawKeyEvent event) {
-    if (event.logicalKey == LogicalKeyboardKey.backspace) {
-      TransactionBuilder(editorState)
-        ..deleteNode(node)
-        ..commit();
-      return KeyEventResult.handled;
-    }
-    return KeyEventResult.ignored;
-  }
-
   @override
   Widget build(BuildContext context) {
     return _build(context);

frontend/app_flowy/packages/flowy_editor/example/lib/plugin/selected_text_node_widget.dart

@@ -4,7 +4,6 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
-import 'package:flutter/services.dart';
 import 'package:url_launcher/url_launcher_string.dart';
 
 class SelectedTextNodeBuilder extends NodeWidgetBuilder {
@@ -20,7 +19,6 @@ class SelectedTextNodeBuilder extends NodeWidgetBuilder {
 
   @override
   Widget build(BuildContext buildContext) {
-    print('key -> $key');
     return _SelectedTextNodeWidget(
       key: key,
       node: node,
@@ -45,7 +43,7 @@ class _SelectedTextNodeWidget extends StatefulWidget {
 }
 
 class _SelectedTextNodeWidgetState extends State<_SelectedTextNodeWidget>
-    with Selectable, KeyboardEventsRespondable {
+    with Selectable {
   TextNode get node => widget.node as TextNode;
   EditorState get editorState => widget.editorState;
 
@@ -99,39 +97,6 @@ class _SelectedTextNodeWidgetState extends State<_SelectedTextNodeWidget>
     return _textSelection;
   }
 
-  @override
-  KeyEventResult onKeyDown(RawKeyEvent event) {
-    if (event.logicalKey == LogicalKeyboardKey.backspace) {
-      final textSelection = _textSelection;
-      // TODO: just handle upforward delete.
-      if (textSelection != null) {
-        if (textSelection.isCollapsed) {
-          print(node.toRawString());
-          print('is empty ${node.toRawString().isEmpty}');
-          if (textSelection.baseOffset == 0 && node.toRawString().isEmpty) {
-            TransactionBuilder(editorState)
-              ..deleteNode(node)
-              ..commit();
-          } else {
-            TransactionBuilder(editorState)
-              ..deleteText(node, textSelection.start - 1, 1)
-              ..commit();
-            // final rect = _computeCursorRect(textSelection.baseOffset - 1);
-            // editorState.tapOffset = rect.center;
-            // editorState.updateCursor();
-          }
-        } else {
-          TransactionBuilder(editorState)
-            ..deleteText(node, textSelection.start,
-                textSelection.baseOffset - textSelection.extentOffset)
-            ..commit();
-        }
-      }
-      return KeyEventResult.handled;
-    }
-    return KeyEventResult.ignored;
-  }
-
   @override
   Widget build(BuildContext context) {
     print('text rebuild $this');

frontend/app_flowy/packages/flowy_editor/lib/editor_state.dart

@@ -1,9 +1,5 @@
-import 'dart:collection';
-
 import 'package:flowy_editor/document/node.dart';
-import 'package:flowy_editor/keyboard.dart';
 import 'package:flowy_editor/operation/operation.dart';
-import 'package:flowy_editor/render/selectable.dart';
 import 'package:flutter/material.dart';
 
 import './document/state_tree.dart';
@@ -26,14 +22,11 @@ class EditorState {
 
   /// TODO: move to a better place.
   Widget build(BuildContext context) {
-    return Keyboard(
-      editorState: this,
-      child: renderPlugins.buildWidget(
-        context: NodeWidgetContext(
-          buildContext: context,
-          node: document.root,
-          editorState: this,
-        ),
+    return renderPlugins.buildWidget(
+      context: NodeWidgetContext(
+        buildContext: context,
+        node: document.root,
+        editorState: this,
       ),
     );
   }

frontend/app_flowy/packages/flowy_editor/lib/keyboard.dart

@@ -1,45 +0,0 @@
-import '../render/selectable.dart';
-import 'editor_state.dart';
-
-import 'package:flutter/services.dart';
-import 'package:flutter/material.dart';
-
-class Keyboard extends StatelessWidget {
-  final Widget child;
-  final focusNode = FocusNode();
-  final EditorState editorState;
-
-  Keyboard({
-    Key? key,
-    required this.child,
-    required this.editorState,
-  }) : super(key: key);
-
-  @override
-  Widget build(BuildContext context) {
-    return Focus(
-      focusNode: focusNode,
-      autofocus: true,
-      onKey: _onKey,
-      child: child,
-    );
-  }
-
-  KeyEventResult _onKey(FocusNode node, RawKeyEvent event) {
-    // if (event is! RawKeyDownEvent) {
-    //   return KeyEventResult.ignored;
-    // }
-    // List<KeyEventResult> result = [];
-    // for (final node in editorState.selectedNodes) {
-    //   if (node.key != null &&
-    //       node.key?.currentState is KeyboardEventsRespondable) {
-    //     final respondable = node.key!.currentState as KeyboardEventsRespondable;
-    //     result.add(respondable.onKeyDown(event));
-    //   }
-    // }
-    // if (result.contains(KeyEventResult.handled)) {
-    //   return KeyEventResult.handled;
-    // }
-    return KeyEventResult.ignored;
-  }
-}

frontend/app_flowy/packages/flowy_editor/lib/render/render_plugins.dart

@@ -51,7 +51,6 @@ class RenderPlugins {
     _nodeWidgetBuilders.removeWhere((key, _) => key == name);
   }
 
-  @protected
   Widget buildWidget({
     required NodeWidgetContext context,
     bool withSubtype = true,

frontend/app_flowy/packages/flowy_editor/lib/render/selectable.dart

@@ -12,7 +12,3 @@ mixin Selectable<T extends StatefulWidget> on State<T> {
   /// For [TextNode] only.
   TextSelection? getTextSelection();
 }
-
-mixin KeyboardEventsRespondable<T extends StatefulWidget> on State<T> {
-  KeyEventResult onKeyDown(RawKeyEvent event);
-}