Add custom divider

lib/src/resizable_widget.dart

@@ -48,10 +48,17 @@ class ResizableWidget extends StatefulWidget {
   /// Note that [onResized] is called every frame when resizing [children].
   final OnResizedFunc? onResized;
 
+  /// Divider widget.
+  /// This widget is inserted between the children.
+  /// If you set this value, the length of [children] will be doubled.
+  /// The [divider] will be inserted between the original [children].
+  final Widget? divider;
+
   /// Creates [ResizableWidget].
   ResizableWidget({
     Key? key,
     required this.children,
+    this.divider,
     this.percentages,
     @Deprecated('Use [isHorizontalSeparator] instead')
         this.isColumnChildren = false,

lib/src/resizable_widget_args_info.dart

@@ -9,6 +9,7 @@ class ResizableWidgetArgsInfo {
   final double separatorSize;
   final Color separatorColor;
   final OnResizedFunc? onResized;
+  final Widget? divider;
 
   ResizableWidgetArgsInfo(ResizableWidget widget)
       : children = widget.children,
@@ -20,5 +21,6 @@ class ResizableWidgetArgsInfo {
         isDisabledSmartHide = widget.isDisabledSmartHide,
         separatorSize = widget.separatorSize,
         separatorColor = widget.separatorColor,
-        onResized = widget.onResized;
+        onResized = widget.onResized,
+        divider = widget.divider;
 }

lib/src/resizable_widget_model.dart

@@ -32,6 +32,7 @@ class ResizableWidgetModel {
             _info.isDisabledSmartHide,
             _info.separatorSize,
             _info.separatorColor,
+            _info.divider,
           )),
           null));
     }

lib/src/separator.dart

@@ -23,18 +23,18 @@ class _SeparatorState extends State<Separator> {
     super.initState();
 
     _info = widget.info;
-    _controller =
-        SeparatorController(widget.info.index, widget.info.parentController);
+    _controller = SeparatorController(widget.info.index, widget.info.parentController);
   }
 
   @override
   Widget build(BuildContext context) => GestureDetector(
         child: MouseRegion(
-          cursor: _info.isHorizontalSeparator
-              ? SystemMouseCursors.resizeRow
-              : SystemMouseCursors.resizeColumn,
+          cursor: _info.isHorizontalSeparator ? SystemMouseCursors.resizeRow : SystemMouseCursors.resizeColumn,
           child: SizedBox(
-            child: Container(color: _info.color),
+            child: Container(
+              color: _info.color,
+              child: _info.child,
+            ),
             width: _info.isHorizontalSeparator ? double.infinity : _info.size,
             height: _info.isHorizontalSeparator ? _info.size : double.infinity,
           ),

lib/src/separator_args_info.dart

@@ -14,14 +14,16 @@ class SeparatorArgsBasicInfo {
   final bool isDisabledSmartHide;
   final double size;
   final Color color;
+  final Widget? child;
 
   const SeparatorArgsBasicInfo(this.index, this.isHorizontalSeparator,
-      this.isDisabledSmartHide, this.size, this.color);
+      this.isDisabledSmartHide, this.size, this.color, this.child);
 
   SeparatorArgsBasicInfo.clone(SeparatorArgsBasicInfo info)
       : index = info.index,
         isHorizontalSeparator = info.isHorizontalSeparator,
         isDisabledSmartHide = info.isDisabledSmartHide,
         size = info.size,
-        color = info.color;
+        color = info.color,
+        child = info.child;
 }