Add support to all params showBarModalButtonSheet

@@ -10,11 +10,18 @@ const Radius _default_bar_top_radius = Radius.circular(15);
 
 class BarBottomSheet extends StatelessWidget {
   final Widget child;
-  final Widget topControl;
-  final Radius topRadius;
+  final Widget control;
+  final Clip clipBehavior;
+  final double elevation;
+  final ShapeBorder shape;
 
   const BarBottomSheet(
-      {Key key, this.child, this.topControl, @required this.topRadius})
+      {Key key,
+      this.child,
+      this.control,
+      this.clipBehavior,
+      this.shape,
+      this.elevation})
       : super(key: key);
 
   @override
@@ -28,7 +35,7 @@ class BarBottomSheet extends StatelessWidget {
             SizedBox(height: 12),
             SafeArea(
               bottom: false,
-              child: topControl ??
+              child: control ??
                   Container(
                     height: 6,
                     width: 40,
@@ -41,21 +48,20 @@ class BarBottomSheet extends StatelessWidget {
             Flexible(
               flex: 1,
               fit: FlexFit.loose,
-              child: ClipRRect(
-                borderRadius:
-                    BorderRadius.only(topLeft: topRadius, topRight: topRadius),
-                child: Container(
-                    decoration: BoxDecoration(
-                        color: Theme.of(context).scaffoldBackgroundColor,
-                        boxShadow: [
-                          BoxShadow(
-                              blurRadius: 10,
-                              color: Colors.black12,
-                              spreadRadius: 5)
-                        ]),
+              child: Material(
+                shape: RoundedRectangleBorder(
+                  side: BorderSide(),
+                  borderRadius: BorderRadius.only(
+                      topLeft: _default_bar_top_radius,
+                      topRight: _default_bar_top_radius),
+                ),
+                clipBehavior: clipBehavior ?? Clip.hardEdge,
+                elevation: elevation ?? 2,
+                child: SizedBox(
                   width: double.infinity,
                   child: MediaQuery.removePadding(
-                        context: context, removeTop: true, child: child)),
+                      context: context, removeTop: true, child: child),
+                ),
               ),
             ),
           ]),
@@ -78,7 +84,6 @@ Future<T> showBarModalBottomSheet<T>({
   bool useRootNavigator = false,
   bool isDismissible = true,
   bool enableDrag = true,
-  Radius topRadius = _default_bar_top_radius,
   Widget topControl,
   Duration duration,
 }) async {
@@ -96,8 +101,10 @@ Future<T> showBarModalBottomSheet<T>({
     bounce: bounce,
     containerBuilder: (_, __, child) => BarBottomSheet(
       child: child,
-      topRadius: topRadius,
-      topControl: topControl,
+      control: topControl,
+      clipBehavior: clipBehavior,
+      shape: shape,
+      elevation: elevation,
     ),
     secondAnimationController: secondAnimation,
     expanded: expand,