Flutter Listview not scrolling to down by programatically - flutter

Question

I have a simple chat app I need to scroll to bottom of list view when data loads but its not going to bottom.
My code
final ScrollController _scrollController = ScrollController();
void connectsocket() {
userId = Provider.of<UserController>(context, listen: false)
.userdata
.sId
.toString();
try {
socket = IO.io(ApiUrl.chatUrl, <String, dynamic>{
'transports': ['websocket'],
'autoConnect': true,
'force new connection': true,
});
socket.connect();
socket.on('connect', (_) {
print('connect: ${socket.id}');
socket.emit('joinRoom', {'user': userId, 'chatroom': widget.roomid});
socket.on('getRoom', (data) {
setState(() {
messageList = data['data']['messages'];
});
Future.delayed(Duration(seconds: 1), () {
_scrollController.animateTo(
_scrollController.position.maxScrollExtent,
curve: Curves.easeOut,
duration: const Duration(milliseconds: 500),
);
});
});
socket.on('message', (data) {
setState(() {
messageList.add(data['data']);
messageList = Set.of(messageList).toList();
});
});
});
} catch (e) {
print(e.toString());
}
}
ListView.
SizedBox(
width: size.width * 0.95,
child: ListView.builder(
controller: _scrollController,
shrinkWrap: true,
// physics: NeverScrollableScrollPhysics(),
itemCount: messageList.length,
itemBuilder: (context, index) {
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Card(
color: Theme.of(context).colorScheme.tertiary,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(10),
bottomLeft: Radius.circular(10),
bottomRight: Radius.circular(10)),
),
elevation: 2,
child: Padding(
padding: const EdgeInsets.all(13.0),
child: Text(
messageList[index]['message'],
style: Theme.of(context).textTheme.bodyMedium,
),
),
),
],
);
}),
),
When I get the message list I simply set data in a list and make the controller go down after 1 second but it's not scrolling down. I try to set the height etc but nothing is working.