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lib/util/list_padding.dart

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+import 'package:collection/collection.dart';
+import 'package:flutter/material.dart';
+
+extension ListExtensions on List<Widget> {
+  addInBetween(Widget widget) {
+    return mapIndexed(
+      (index, element) {
+        if (element != last) {
+          return [element, widget];
+        } else {
+          return [element];
+        }
+      },
+    ).expand((element) => element).toList();
+  }
+
+  addPadding(EdgeInsets padding) {
+    return map((e) {
+      if (e is Expanded || e is Spacer || e is Flexible) return e;
+      return Padding(
+        padding: padding.copyWith(
+          top: e == first ? 0 : null,
+          left: e == first ? 0 : null,
+          right: e == last ? 0 : null,
+          bottom: e == last ? 0 : null,
+        ),
+        child: e,
+      );
+    }).toList();
+  }
+
+  addSize({double? width, double? height}) {
+    return map((e) {
+      if (e is Expanded || e is Spacer || e is Flexible) return e;
+      return SizedBox(
+        width: width,
+        height: height,
+        child: e,
+      );
+    }).toList();
+  }
+}