Navigate to another page from ListTile - flutter

Question

My app got a expandable List with multiple entries. I want to navigate to different pages by clicking on the ListTiles on the lowest level. I know that there's the 'onTap' method but it requires a buildContext which I dont have the way I programmed it.
I got the code from the web and modified it just a little. Heres the Code:
import 'package:flutter/material.dart';
import '../screens/model_view_screen.dart';
import '../models/entry.dart';
class EntryItem extends StatelessWidget {
const EntryItem(this.entry);
final Entry entry;
Widget _buildTiles(Entry root) {
if (root.children.isEmpty) {
return Padding(
padding: const EdgeInsets.all(10.0),
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(15),
border: Border.all(
width: 2,
color: Color.fromRGBO(3, 120, 163, 1),
),
),
child: ListTile(
leading: Image.asset(root.imageUrl),
title: Text(root.title),
onTap: () {},
),
),
);
}
return Padding(
padding: const EdgeInsets.all(10.0),
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(15),
border: Border.all(
width: 3,
color: Color.fromRGBO(3, 120, 163, 1),
),
),
child: ExpansionTile(
key: PageStorageKey<Entry>(root),
leading: Image.asset(root.imageUrl),
title: Text(root.title, style: TextStyle(color: Colors.black)),
children: root.children.map<Widget>(_buildTiles).toList(),
),
),
);
}
#override
Widget build(BuildContext context) {
return _buildTiles(entry);
}
}
The routeName of the destination is given in a List:
class Entry{
final String title;
final String imageUrl;
final String routeName;
final List<Entry> children;
Entry(this.title, this.imageUrl, this.routeName, [this.children = const <Entry>[]]);
}
Thank you in advance.

Answer 1

You want to pass BuildContext to _buildTiles:
Widget _buildTiles(BuildContext context, Entry root) {
....
child: ListTile(
leading: Image.asset(root.imageUrl),
title: Text(root.title),
onTap: () => Navigator.of(context).pushNamed(root.routeName),
),
....
children: root.children.map((e) => _buildTiles(context, e)).toList(),
....
#override
Widget build(BuildContext context) {
return _buildTiles(context, entry);
}