点击菜单图标时 flutter 抽屉

Question

我目前正在试用抽屉小部件。我构建了一个带有汉堡菜单图标、标题文本和搜索图标的应用栏。
这是我的代码:
`

import 'package:flutter/material.dart';
import 'package:hexcolor/hexcolor.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
        child: Scaffold(
            appBar: PreferredSize(
                child: Container(
                  color: Colors.white,
                  padding:
                      EdgeInsets.only(left: 10, right: 10, top: 10, bottom: 10),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: <Widget>[
                      Icon(Icons.menu),
                      Text(
                        'Appbar',
                        style: TextStyle(fontWeight: FontWeight.bold),
                      ),
                      Icon(Icons.search)
                    ],
                  ),
                ),
                preferredSize: Size.fromHeight(40)),
            backgroundColor: Hexcolor('#e9f1fe'),
            body: Center(
              child: Text('Experimenting drawer'),
            )));
  }
}

`
这是输出: ,
另外，我有一个单独的 dart 文件用于自定义抽屉，我希望在点击汉堡菜单图标时显示。我怎样才能做到这一点？
这是自定义抽屉的代码:

    import 'package:flutter/material.dart';

class DrawerScreen extends StatefulWidget {
  @override
  _DrawerScreenState createState() => _DrawerScreenState();
}

class _DrawerScreenState extends State<DrawerScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      drawer: Drawer(
          child: Column(
        children: [
          ListTile(
            leading: CircleAvatar(
              radius: 28,
              backgroundColor: Colors.blueGrey,
              child: CircleAvatar(
                radius: 50,
                backgroundImage: AssetImage('assets/images/joker.jpg'),
              ),
            ),
            title: Text(
              'Joaquin Phoenix',
              style: TextStyle(
                color: Colors.black,
                fontFamily: 'Roboto',
                fontWeight: FontWeight.bold,
                fontSize: 14,
              ),
            ),
            subtitle: Text(
              "You wouldn't get it",
              style: TextStyle(
                  color: Colors.black,
                  fontFamily: 'Roboto',
                  fontWeight: FontWeight.w400,
                  fontSize: 10.0),
            ),
          )
        ],
      )),
      backgroundColor: Colors.blue[50],
    );
  }
}

Answer 1

您可以复制粘贴运行下面的两个完整代码
第一步:_DrawerScreenState删除 Scaffold第 2 步:对于 drawer背景颜色，你可以用 Theme 包裹

class _DrawerScreenState extends State<DrawerScreen> {
  @override
  Widget build(BuildContext context) {
    return Theme(
      data: Theme.of(context).copyWith(
        canvasColor: Colors.blue[50],
      ),
      child: Drawer(

第 3 步:使用 DrawerScreen()在 main.dart

SafeArea(
    child: Scaffold(
        drawer: DrawerScreen(),

第 4 步:包装 Icons.menu与 Builder并打开 openDrawer()

Builder(
        builder: (context) => GestureDetector(
            onTap: () {
              Scaffold.of(context).openDrawer();
            },
            child: Icon(Icons.menu)),
      ),

工作演示

全码 main.dart

import 'package:flutter/material.dart';
import 'package:hexcolor/hexcolor.dart';
import 'drawer.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
        child: Scaffold(
            drawer: DrawerScreen(),
            appBar: PreferredSize(
                child: Container(
                  color: Colors.white,
                  padding:
                      EdgeInsets.only(left: 10, right: 10, top: 10, bottom: 10),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: <Widget>[
                      Builder(
                        builder: (context) => GestureDetector(
                            onTap: () {
                              Scaffold.of(context).openDrawer();
                            },
                            child: Icon(Icons.menu)),
                      ),
                      Text(
                        'Appbar',
                        style: TextStyle(fontWeight: FontWeight.bold),
                      ),
                      Icon(Icons.search)
                    ],
                  ),
                ),
                preferredSize: Size.fromHeight(40)),
            backgroundColor: Hexcolor('#e9f1fe'),
            body: Center(
              child: Text('Experimenting drawer'),
            )));
  }
}

全码 drawer.dart

import 'package:flutter/material.dart';

class DrawerScreen extends StatefulWidget {
  @override
  _DrawerScreenState createState() => _DrawerScreenState();
}

class _DrawerScreenState extends State<DrawerScreen> {
  @override
  Widget build(BuildContext context) {
    return Theme(
      data: Theme.of(context).copyWith(
        canvasColor: Colors.blue[50],
      ),
      child: Drawer(
          child: Column(
            children: [
              ListTile(
                leading: CircleAvatar(
                  radius: 28,
                  backgroundColor: Colors.blueGrey,
                  child: CircleAvatar(
                    radius: 50,
                    backgroundImage: AssetImage('assets/images/joker.jpg'),
                  ),
                ),
                title: Text(
                  'Joaquin Phoenix',
                  style: TextStyle(
                    color: Colors.black,
                    fontFamily: 'Roboto',
                    fontWeight: FontWeight.bold,
                    fontSize: 14,
                  ),
                ),
                subtitle: Text(
                  "You wouldn't get it",
                  style: TextStyle(
                      color: Colors.black,
                      fontFamily: 'Roboto',
                      fontWeight: FontWeight.w400,
                      fontSize: 10.0),
                ),
              )
            ],
          )),
    );
  }
}