Expand The App bar in Flutter to Allow Multi-Line Title?

问题

Does anyone know how I can create an app bar with a multi-line title, as per the material guidelines show here?

https://material.io/design/components/app-bars-top.html#anatomy

Any ideas how to do this? It seems like it should be straightforward given that it's part of the material guidelines! Worth pointing out that the title is user defined, so I want to allow the app bar to expand from a single line to multiple lines (perhaps with a limit imposed) depending on user input.

Mike

回答1:

This is not implemented yet.

However you can achieve similar results by using SliverAppBar designed for CustomScrollView.

Bear in mind that this is not optimal though. As it required hard coding the size of the icons and stuff. Due to FlexibleSpacebar not having width constraint.

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter_project/materialSheet.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomScrollView(
        slivers: <Widget>[
          SliverMultilineAppBar(
            title: "Summer Trip to Tokyo and Kyoto",
            leading: IconButton(
              onPressed: () {},
              icon: Icon(Icons.menu),
            ),
            actions: <Widget>[
              IconButton(
                onPressed: () {},
                icon: Icon(Icons.search),
              ),
              IconButton(
                onPressed: () {},
                icon: Icon(Icons.more_vert),
              ),
            ],
          ),
        ],
      ),
    );
  }
}

class SliverMultilineAppBar extends StatelessWidget {
  final String title;
  final Widget leading;
  final List<Widget> actions;

  SliverMultilineAppBar({this.title, this.leading, this.actions});

  @override
  Widget build(BuildContext context) {
    final mediaQuery = MediaQuery.of(context);

    double availableWidth = mediaQuery.size.width - 160;
    if (actions != null) {
      availableWidth -= 32 * actions.length;
    }
    if (leading != null) {
      availableWidth -= 32;
    }
    return SliverAppBar(
      expandedHeight: 120.0,
      forceElevated: true,
      leading: leading,
      actions: actions,
      flexibleSpace: FlexibleSpaceBar(
        title: ConstrainedBox(
          constraints: BoxConstraints(
            maxWidth: availableWidth,
          ),
          child: Text(title, textScaleFactor: .8,),
        ),
      ),
    );
  }
}

回答2:

AppBar will let you get close to this, however you do have to indicate the height of the bottom PreferredSize widget, according to your text length, which isn't ideal.

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      backgroundColor: Colors.deepPurple,
      leading: IconButton(icon: Icon(Icons.menu), onPressed: () {}),
      actions: <Widget>[
        IconButton(icon: Icon(Icons.search), onPressed: () {}),
        IconButton(icon: Icon(Icons.more_vert), onPressed: () {}),
      ],
      bottom: PreferredSize(
        child: Padding(
          padding: const EdgeInsets.fromLTRB(80.0, 0.0, 80.0, 16.0),
          child: Text(
            "Summer Trip to Tokyo and Kyoto",
            style: TextStyle(
              color: Colors.white,
              fontSize: 24.0,
            ),
          ),
        ),
        preferredSize: Size(0.0, 80.0),
      ),
    ),
    body: Text("..."),
  );
}

回答3:

You can use RichText:

          SliverAppBar(
        flexibleSpace: FlexibleSpaceBar(
          background: Container(
            color: Colors.indigoAccent,
          ),
          title: RichText(
            text: TextSpan(children: [
              TextSpan(
                text: Constants.homePageTitle,
                style: textTheme.headline,
              ),
              TextSpan(text: "\n"),
              TextSpan(
                text: Constants.homePageSubtitle,
                style: textTheme.subtitle,
              )
            ]),
          ),
          titlePadding: EdgeInsets.only(left: 10, bottom: 20),
        ),
        floating: true,
        backgroundColor: Colors.greenAccent,
        expandedHeight: 150.0,
      ),

来源：https://stackoverflow.com/questions/50764558/expand-the-app-bar-in-flutter-to-allow-multi-line-title