Attempt to fix hover color to a more reasonable color for a dark theme

lib/src/tree_node.dart

@@ -1,6 +1,7 @@
 import 'dart:math' show pi;
 
 import 'package:flutter/material.dart';
+import 'package:flutter_treeview/flutter_treeview.dart';
 
 import 'tree_view.dart';
 import 'tree_view_theme.dart';
@@ -398,10 +399,12 @@ class _TreeNodeExpanderState extends State<_TreeNodeExpander>
 
   Color? _onColor(Color? color) {
     if (color != null) {
-      if (color.computeLuminance() > 0.6) {
-        return Colors.black;
+      if (color.computeLuminance() > 0.75) {
+        return Utilities.BLACK;
+      } else if (color.computeLuminance() > 0.25) {
+        return Utilities.GREY;
       } else {
-        return Colors.white;
+        return Utilities.WHITE;
       }
     }
     return null;

lib/src/tree_view.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_treeview/flutter_treeview.dart';
 
 import 'tree_view_controller.dart';
 import 'tree_view_theme.dart';
@@ -132,7 +133,10 @@ class _TreeViewData<T> extends StatelessWidget {
   Widget build(BuildContext context) {
     ThemeData _parentTheme = Theme.of(context);
     return Theme(
-      data: _parentTheme.copyWith(hoverColor: Colors.grey.shade100),
+      data: _parentTheme.copyWith(
+          hoverColor: _parentTheme == ThemeData.dark()
+              ? Utilities.GREY
+              : Utilities.WHITE),
       child: ListView(
         shrinkWrap: shrinkWrap!,
         primary: primary,

lib/src/utilities.dart

@@ -7,14 +7,17 @@ import 'package:flutter/material.dart';
 class Utilities {
   static const Color BLACK = Color.fromARGB(255, 0, 0, 0);
   static const Color WHITE = Color.fromARGB(255, 255, 255, 255);
+  static const Color GREY = Color.fromARGB(255, 80, 80, 80);
 
   static String toRGBA(Color color) {
     return 'rgba(${color.r},${color.g},${color.b},${color.a / 255})';
   }
 
   static Color textColor(Color color) {
-    if (color.computeLuminance() > 0.6) {
+    if (color.computeLuminance() > 0.75) {
       return BLACK;
+    } else if (color.computeLuminance() > 0.25) {
+      return GREY;
     } else {
       return WHITE;
     }

pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_treeview
 description: A tree widget for Flutter that can be used to display nested, hierarchical data. It includes a number of features like styling labels, icons, and import and export utilities.
-version: 1.2.020425+1239
+version: 1.2.020525+0254
 repository: https://git.zontreck.com/AriasCreations/flutter_treeview
 issue_tracker: https://git.zontreck.com/AriasCreations/flutter_treeview/issues
 #author: kevinandre.com <kevin@codeninelabs.com>