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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
import 'package:flutter/material.dart';
/// Screen that allows the user to select a text file using `openFile`, then
/// displays its contents in a dialog.
class OpenTextPage extends StatelessWidget {
/// Default Constructor
const OpenTextPage({super.key});
Future<void> _openTextFile(BuildContext context) async {
const XTypeGroup typeGroup = XTypeGroup(
label: 'text',
extensions: <String>['txt', 'json'],
);
final XFile? file = await FileSelectorPlatform.instance
.openFile(acceptedTypeGroups: <XTypeGroup>[typeGroup]);
if (file == null) {
// Operation was canceled by the user.
return;
}
final String fileName = file.name;
final String fileContent = await file.readAsString();
if (context.mounted) {
await showDialog<void>(
context: context,
builder: (BuildContext context) => TextDisplay(fileName, fileContent),
);
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Open a text file'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ElevatedButton(
style: ElevatedButton.styleFrom(
backgroundColor: Colors.blue,
foregroundColor: Colors.white,
),
child: const Text('Press to open a text file (json, txt)'),
onPressed: () => _openTextFile(context),
),
],
),
),
);
}
}
/// Widget that displays a text file in a dialog.
class TextDisplay extends StatelessWidget {
/// Default Constructor.
const TextDisplay(this.fileName, this.fileContent, {super.key});
/// The name of the selected file.
final String fileName;
/// The contents of the text file.
final String fileContent;
@override
Widget build(BuildContext context) {
return AlertDialog(
title: Text(fileName),
content: Scrollbar(
child: SingleChildScrollView(
child: Text(fileContent),
),
),
actions: <Widget>[
TextButton(
child: const Text('Close'),
onPressed: () => Navigator.pop(context),
),
],
);
}
}