Merge pull request #550 from alexkharech/patch-1

Allows you to insert widgets inside a CustomScrollView

 import 'package:flutter/widgets.dart';
 
+/// add Padding Property to widget
 extension WidgetPaddingX on Widget {
   Widget paddingAll(double padding) =>
       Padding(padding: EdgeInsets.all(padding), child: this);
@@ -24,6 +25,7 @@ extension WidgetPaddingX on Widget {
   Widget get paddingZero => Padding(padding: EdgeInsets.zero, child: this);
 }
 
+/// Add margin property to widget
 extension WidgetMarginX on Widget {
   Widget marginAll(double margin) =>
       Container(margin: EdgeInsets.all(margin), child: this);
@@ -40,10 +42,15 @@ extension WidgetMarginX on Widget {
     double right = 0.0,
     double bottom = 0.0,
   }) =>
-      Container(
+      Padding(
           margin: EdgeInsets.only(
               top: top, left: left, right: right, bottom: bottom),
           child: this);
 
   Widget get marginZero => Container(margin: EdgeInsets.zero, child: this);
 }
+
+/// Allows you to insert widgets inside a CustomScrollView
+extension WidgetSliverBoxX on Widget {
+  Widget get sliverBox => SliverToBoxAdapter(child: this);
+}