| // 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'], |
| uniformTypeIdentifiers: <String>['public.text'], |
| ); |
| 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), |
| ), |
| ], |
| ); |
| } |
| } |