[Flutter] LimitedBox 예제 - 최대크기를 고정한 스크롤 화면

 

 

Flutter에서 최대크기 이전까지는 자동으로 늘어나다가 그 이상에서는 고정되는 화면을 구현해야 할 경우는 LimitedBox를 사용하면 된다. 

 

전체소스

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const SimpleHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class SimpleHomePage extends StatefulWidget {
  const SimpleHomePage({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  State<SimpleHomePage> createState() => _SimpleHomePageState();
}

class _SimpleHomePageState extends State<SimpleHomePage> {
  int listCount = 0;

  void showDialogTest(BuildContext ctx) {
    showDialog(
        context: ctx,
        builder: (BuildContext context) {
          return AlertDialog(
            scrollable: true,
            title: Text('선택'),
            content: Container(
              child: LimitedBox(
                maxHeight: 300,
                child: SingleChildScrollView(
                  child: Expanded(
                    child: Column(
                      children: [
                        for (var i = 0; i < listCount; i++) ...{
                          ListTile(
                            title: Text("item ${i}"),
                            onTap: () => {},
                          )
                        }
                      ],
                    ),
                  ),
                ),
              ),
            ),
          );
        });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              ElevatedButton(
                  onPressed: () {
                    listCount = 100;
                    showDialogTest(context);
                  },
                  child: Text(
                    "show dialog - 100 아이템",
                    style: TextStyle(fontSize: 20),
                  )),
              SizedBox(
                height: 16,
              ),
              ElevatedButton(
                  onPressed: () {
                    listCount = 1;
                    showDialogTest(context);
                  },
                  child: Text(
                    "show dialog - 1 아이템",
                    style: TextStyle(fontSize: 20),
                  ))
            ],
          ),
        ));
  }
}