[Flutter] how to refresh ListView.builder flutter

How can I refresh my ListView.builder when adding item to the list?

ListView.builder(
itemCount: propList.length,
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemBuilder: (context,index)=> Text(propList[index]),
)


my button is

FlatButton(onPressed: (){propList.add('text');}, child: Text('add'))

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