Flutter заставляет события касания проходить через AppBar

Question

Нужна моя прозрачная панель приложений для пропускания событий касания, но не для кнопки навигации ящика. Я хочу, чтобы пользователь мог прокручивать список независимо от того, находятся ли они в верхней части экрана устройства. Если вы запустите код под AppBar, то это предотвратит touchDown, пока палец находится на appBar.

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  final appTitle = '';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: appTitle,
      home: MyHomePage(title: appTitle),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final String title;

  MyHomePage({Key key, this.title}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      extendBodyBehindAppBar: true,
      backgroundColor: Colors.purple,
      appBar: AppBar( title:Text(title), elevation: 0.0, backgroundColor: Colors.red.withOpacity(0.0)),
      body: Center(child: ListView(
  padding: const EdgeInsets.all(0),
  children: <Widget>[
    Container(
      height: 50,
      color: Colors.amber[600],
      child: const Center(child: Text('Entry A')),
    ),
    Container(
      height: 50,
      color: Colors.amber[500],
      child: const Center(child: Text('Entry B')),
    ),
    Container(
      height: 50,
      color: Colors.amber[100],
      child: const Center(child: Text('Entry C')),
    ),
    Container(
      height: 50,
      color: Colors.amber[600],
      child: const Center(child: Text('Entry A')),
    ),
    Container(
      height: 50,
      color: Colors.amber[500],
      child: const Center(child: Text('Entry B')),
    ),
    Container(
      height: 50,
      color: Colors.amber[100],
      child: const Center(child: Text('Entry C')),
    ),
    Container(
      height: 50,
      color: Colors.amber[600],
      child: const Center(child: Text('Entry A')),
    ),
    Container(
      height: 50,
      color: Colors.amber[500],
      child: const Center(child: Text('Entry B')),
    ),
    Container(
      height: 50,
      color: Colors.amber[100],
      child: const Center(child: Text('Entry C')),
    ),
    Container(
      height: 50,
      color: Colors.amber[600],
      child: const Center(child: Text('Entry A')),
    ),
    Container(
      height: 50,
      color: Colors.amber[500],
      child: const Center(child: Text('Entry B')),
    ),
    Container(
      height: 50,
      color: Colors.amber[100],
      child: const Center(child: Text('Entry C')),
    ),
    Container(
      height: 50,
      color: Colors.amber[600],
      child: const Center(child: Text('Entry A')),
    ),
    Container(
      height: 50,
      color: Colors.amber[500],
      child: const Center(child: Text('Entry B')),
    ),
    Container(
      height: 50,
      color: Colors.amber[100],
      child: const Center(child: Text('Entry C')),
    ),
    Container(
      height: 50,
      color: Colors.amber[600],
      child: const Center(child: Text('Entry A')),
    ),
    Container(
      height: 50,
      color: Colors.amber[500],
      child: const Center(child: Text('Entry B')),
    ),
    Container(
      height: 50,
      color: Colors.amber[100],
      child: const Center(child: Text('Entry C')),
    ),
    Container(
      height: 50,
      color: Colors.amber[600],
      child: const Center(child: Text('Entry A')),
    ),
    Container(
      height: 50,
      color: Colors.amber[500],
      child: const Center(child: Text('Entry B')),
    ),
    Container(
      height: 50,
      color: Colors.amber[100],
      child: const Center(child: Text('Entry C')),
    ),
  ],
)),
      drawer: Drawer(
        // Add a ListView to the drawer. This ensures the user can scroll
        // through the options in the drawer if there isn't enough vertical
        // space to fit everything.
        child: ListView(
          // Important: Remove any padding from the ListView.
          padding: EdgeInsets.zero,
          children: <Widget>[
            DrawerHeader(
              child: Text('Drawer Header'),
              decoration: BoxDecoration(
                color: Colors.blue,
              ),
            ),
            ListTile(
              title: Text('Item 1'),
              onTap: () {
                // Update the state of the app
                // ...
                // Then close the drawer
                Navigator.pop(context);
              },
            ),
            ListTile(
              title: Text('Item 2'),
              onTap: () {
                // Update the state of the app
                // ...
                // Then close the drawer
                Navigator.pop(context);
              },
            ),
          ],
        ),
      ),
    );
  }
}

Answer 1

Я предположил, что вам не нужен AppBar, поэтому вы сделали его прозрачным; Не уверен, что.

Но если вам это не нужно, и вы все еще хотите, чтобы кнопка меню ящика в верхнем левом углу, вы можете использовать Stack для достижения этого

Вот так

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  final appTitle = '';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: appTitle,
      home: MyHomePage(title: appTitle),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final String title;

  MyHomePage({Key key, this.title}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      extendBodyBehindAppBar: true,
      backgroundColor: Colors.purple,
      body: Stack(
        children: [
          Center(
            child: ListView(
              padding: const EdgeInsets.all(0),
              children: <Widget>[
                Container(
                  height: 50,
                  color: Colors.amber[600],
                  child: const Center(child: Text('Entry A')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[500],
                  child: const Center(child: Text('Entry B')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[100],
                  child: const Center(child: Text('Entry C')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[600],
                  child: const Center(child: Text('Entry A')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[500],
                  child: const Center(child: Text('Entry B')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[100],
                  child: const Center(child: Text('Entry C')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[600],
                  child: const Center(child: Text('Entry A')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[500],
                  child: const Center(child: Text('Entry B')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[100],
                  child: const Center(child: Text('Entry C')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[600],
                  child: const Center(child: Text('Entry A')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[500],
                  child: const Center(child: Text('Entry B')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[100],
                  child: const Center(child: Text('Entry C')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[600],
                  child: const Center(child: Text('Entry A')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[500],
                  child: const Center(child: Text('Entry B')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[100],
                  child: const Center(child: Text('Entry C')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[600],
                  child: const Center(child: Text('Entry A')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[500],
                  child: const Center(child: Text('Entry B')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[100],
                  child: const Center(child: Text('Entry C')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[600],
                  child: const Center(child: Text('Entry A')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[500],
                  child: const Center(child: Text('Entry B')),
                ),
                Container(
                  height: 50,
                  color: Colors.amber[100],
                  child: const Center(child: Text('Entry C')),
                ),
              ],
            ),
          ),
          Positioned(
            top: 10,
            child: Builder(
              builder: (context) {
                return IconButton(
                  color: Colors.white,
                  icon: Icon(Icons.menu),
                  onPressed: (){
                    Scaffold.of(context).openDrawer();
                  },
                );
              }
            ),
          )
        ],
      ),
      drawer: Drawer(
        // Add a ListView to the drawer. This ensures the user can scroll
        // through the options in the drawer if there isn't enough vertical
        // space to fit everything.
        child: ListView(
          // Important: Remove any padding from the ListView.
          padding: EdgeInsets.zero,
          children: <Widget>[
            DrawerHeader(
              child: Text('Drawer Header'),
              decoration: BoxDecoration(
                color: Colors.blue,
              ),
            ),
            ListTile(
              title: Text('Item 1'),
              onTap: () {
                // Update the state of the app
                // ...
                // Then close the drawer
                Navigator.pop(context);
              },
            ),
            ListTile(
              title: Text('Item 2'),
              onTap: () {
                // Update the state of the app
                // ...
                // Then close the drawer
                Navigator.pop(context);
              },
            ),
          ],
        ),
      ),
    );
  }
}