I am imitating telegram desktop app. First time, I tried to put listview in row. But I failed. So I use GridView.count with crossAxisCount: 2.

I want to fill empty area under contents.

And here's the code:

class ChatListWithRoom extends StatelessWidget {
  const ChatListWithRoom({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Expanded(child: ChatList()),
        Expanded(
          child: Container(
            color: Colors.blue,
            child: Center(child: Text("대화방을 선택해주세요")),
          ),
        ),
      ],
    );
  }
}