[NewGroupChatScreen] Refactor

Signed-off-by: Sahil Kumar <[email protected]>

example/lib/new_group_chat_screen.dart

@@ -52,15 +52,7 @@ class _NewGroupChatScreenState extends State<NewGroupChatScreen> {
   Widget build(BuildContext context) {
     return Scaffold(
       backgroundColor: StreamChatTheme.of(context).colorTheme.whiteSnow,
-      body: SafeArea(
-        child: NestedScrollView(
-          floatHeaderSlivers: true,
-          headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
-            return <Widget>[
-              SliverAppBar(
-                brightness: Theme.of(context).brightness,
-                pinned: true,
-                forceElevated: true,
+      appBar: AppBar(
         elevation: 1,
         backgroundColor: StreamChatTheme.of(context).colorTheme.white,
         leading: const StreamBackButton(),
@@ -76,8 +68,7 @@ class _NewGroupChatScreenState extends State<NewGroupChatScreen> {
           if (_selectedUsers.isNotEmpty)
             IconButton(
               icon: StreamSvgIcon.arrow_right(
-                        color:
-                            StreamChatTheme.of(context).colorTheme.accentBlue,
+                color: StreamChatTheme.of(context).colorTheme.accentBlue,
               ),
               onPressed: () async {
                 final updatedList = await Navigator.pushNamed(
@@ -96,6 +87,10 @@ class _NewGroupChatScreenState extends State<NewGroupChatScreen> {
             )
         ],
       ),
+      body: NestedScrollView(
+        floatHeaderSlivers: true,
+        headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
+          return <Widget>[
             SliverToBoxAdapter(
               child: SearchTextField(
                 controller: _controller,
@@ -180,8 +175,7 @@ class _NewGroupChatScreenState extends State<NewGroupChatScreen> {
                 child: Container(
                   width: double.maxFinite,
                   decoration: BoxDecoration(
-                      gradient:
-                          StreamChatTheme.of(context).colorTheme.bgGradient,
+                    gradient: StreamChatTheme.of(context).colorTheme.bgGradient,
                   ),
                   child: Padding(
                     padding: const EdgeInsets.symmetric(
@@ -283,7 +277,6 @@ class _NewGroupChatScreenState extends State<NewGroupChatScreen> {
           ),
         ),
       ),
-      ),
     );
   }
 }