818 lines
23 KiB
Dart
818 lines
23 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'dart:io';
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import 'dart:math';
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import 'package:chewie/chewie.dart';
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import 'package:file_picker/file_picker.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_bloc/flutter_bloc.dart';
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import 'package:flutter_svg/flutter_svg.dart';
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import 'package:open_filex/open_filex.dart';
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import 'package:photo_view/photo_view.dart';
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import 'package:share_plus/share_plus.dart';
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import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';
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import 'package:video_player/video_player.dart';
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import '../routing/app_routes.dart';
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import '../share_intent/remote_file_ref.dart';
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import '../state/app/modules/settings/bloc/settings_cubit.dart';
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import 'app_progress_indicator.dart';
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import 'centered_leading.dart';
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import 'info_dialog.dart';
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import 'share_position_origin.dart';
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class FileViewer extends StatefulWidget {
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final String path;
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final bool openExternal;
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/// Enables in-app "An Chat senden" / "In Dateien speichern" — these
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/// need a server-side reference instead of the local cache path.
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final RemoteFileRef? remoteFile;
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const FileViewer({
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super.key,
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required this.path,
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this.openExternal = false,
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this.remoteFile,
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});
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@override
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State<FileViewer> createState() => _FileViewerState();
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}
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enum FileViewingActions { openExternal, share, save, sendToChat, saveToCloud }
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enum _FileKind { image, svg, pdf, text, video, audio, unknown }
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const Set<String> _imageExtensions = {
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'png',
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'jpg',
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'jpeg',
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'webp',
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'gif',
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'bmp',
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'wbmp',
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};
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const Set<String> _videoExtensions = {
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'mp4',
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'm4v',
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'mov',
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'webm',
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'mkv',
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'3gp',
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};
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/// ogg/opus/flac are Android-only; iOS init errors fall through to the
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/// "format not supported" message.
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const Set<String> _audioExtensions = {
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'mp3',
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'm4a',
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'aac',
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'wav',
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'flac',
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'ogg',
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'oga',
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'opus',
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};
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/// Unknown extensions still get a content sniff via [_looksLikeText].
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const Set<String> _textExtensions = {
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'txt', 'md', 'markdown', 'rst', 'log',
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'json', 'json5', 'xml', 'yaml', 'yml', 'toml',
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'csv', 'tsv', 'tab',
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'ini', 'conf', 'cfg', 'env', 'properties',
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'html', 'htm', 'xhtml',
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'css', 'scss', 'sass', 'less',
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'js', 'mjs', 'cjs', 'ts', 'jsx', 'tsx',
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'dart', 'java', 'kt', 'kts', 'groovy', 'scala', 'swift',
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'py', 'rb', 'pl', 'lua', 'r',
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'go', 'rs', 'zig',
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'c', 'cpp', 'cc', 'cxx', 'h', 'hpp', 'cs', 'm', 'mm',
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'php', 'sh', 'bash', 'zsh', 'fish', 'ps1', 'bat', 'cmd',
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'sql', 'graphql', 'gql',
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'gitignore', 'gitattributes', 'editorconfig', 'dockerignore',
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'dockerfile', 'makefile', 'cmake',
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'tex', 'bib',
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'srt', 'vtt',
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};
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/// 8 KB sniff: NUL bytes or non-UTF-8 sequences disqualify.
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Future<bool> _looksLikeText(String path) async {
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final file = File(path);
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RandomAccessFile? raf;
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try {
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final length = await file.length();
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if (length == 0) return true;
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raf = await file.open();
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final sample = await raf.read(min(length, 8192));
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if (sample.contains(0)) return false;
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utf8.decode(sample);
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return true;
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} on Object {
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return false;
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} finally {
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await raf?.close();
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}
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}
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/// SfPdfViewer asserts on `localToGlobal` if mounted during the page-push
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/// animation. Defer until the route enter animation completes.
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class _DeferredPdfViewer extends StatefulWidget {
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const _DeferredPdfViewer({required this.path});
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final String path;
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@override
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State<_DeferredPdfViewer> createState() => _DeferredPdfViewerState();
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}
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class _DeferredPdfViewerState extends State<_DeferredPdfViewer> {
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bool _ready = false;
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Animation<double>? _routeAnimation;
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@override
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void didChangeDependencies() {
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super.didChangeDependencies();
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if (_ready || _routeAnimation != null) return;
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final animation = ModalRoute.of(context)?.animation;
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if (animation == null || animation.isCompleted) {
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_ready = true;
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return;
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}
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_routeAnimation = animation..addStatusListener(_onAnimationStatus);
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}
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void _onAnimationStatus(AnimationStatus status) {
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if (status == AnimationStatus.completed && mounted) {
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setState(() => _ready = true);
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}
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}
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@override
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void dispose() {
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_routeAnimation?.removeStatusListener(_onAnimationStatus);
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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if (!_ready) {
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return const Center(child: AppProgressIndicator.large());
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}
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return SfPdfViewer.file(File(widget.path));
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}
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}
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class _FileViewerState extends State<FileViewer> {
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final PhotoViewController photoViewController = PhotoViewController();
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late SettingsCubit settings = context.read<SettingsCubit>();
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late bool openExternal;
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Future<_FileKind>? _fileKind;
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@override
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void initState() {
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super.initState();
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openExternal =
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settings.val().fileViewSettings.alwaysOpenExternally ||
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widget.openExternal;
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if (openExternal) {
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WidgetsBinding.instance.addPostFrameCallback(
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(_) => _openExternallyAndPop(),
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);
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} else {
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_fileKind = _detectKind();
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}
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}
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Future<void> _openExternallyAndPop() async {
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final result = await OpenFilex.open(widget.path);
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if (!mounted) return;
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Navigator.of(context).pop();
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if (result.type != ResultType.done) {
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InfoDialog.show(context, result.message);
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}
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}
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@override
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void dispose() {
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photoViewController.dispose();
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super.dispose();
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}
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Future<_FileKind> _detectKind() async {
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final ext = widget.path.split('.').last.toLowerCase();
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if (_imageExtensions.contains(ext)) return _FileKind.image;
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if (ext == 'svg') return _FileKind.svg;
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if (ext == 'pdf') return _FileKind.pdf;
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if (_videoExtensions.contains(ext)) return _FileKind.video;
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if (_audioExtensions.contains(ext)) return _FileKind.audio;
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if (_textExtensions.contains(ext)) return _FileKind.text;
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if (await _looksLikeText(widget.path)) return _FileKind.text;
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return _FileKind.unknown;
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}
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Future<void> _handleAction(FileViewingActions value) async {
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switch (value) {
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case FileViewingActions.openExternal:
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AppRoutes.openFileViewer(
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context,
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widget.path,
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openExternal: true,
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remoteFile: widget.remoteFile,
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);
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break;
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case FileViewingActions.sendToChat:
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AppRoutes.openInternalShareToChat(context, widget.remoteFile!);
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break;
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case FileViewingActions.saveToCloud:
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AppRoutes.openInternalSaveToFolder(context, widget.remoteFile!);
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break;
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case FileViewingActions.share:
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unawaited(
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SharePlus.instance.share(
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ShareParams(
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files: [XFile(widget.path)],
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sharePositionOrigin: SharePositionOrigin.get(context),
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),
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),
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);
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break;
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case FileViewingActions.save:
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try {
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final source = File(widget.path);
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final size = await source.length();
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// file_picker has no path/stream save API, so the whole file
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// gets loaded into RAM. Cap big media; user falls back to share.
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const maxBytes = 200 * 1024 * 1024;
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if (size > maxBytes) {
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if (!mounted) return;
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InfoDialog.show(
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context,
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'Diese Datei ist zu groß (${(size / (1024 * 1024)).toStringAsFixed(0)} MB), '
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'um direkt gespeichert zu werden. Nutze stattdessen die Teilen-Funktion.',
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title: 'Speichern nicht möglich',
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);
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return;
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}
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final bytes = await source.readAsBytes();
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final saved = await FilePicker.saveFile(
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fileName: widget.path.split('/').last,
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bytes: bytes,
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);
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if (!mounted) return;
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if (saved != null) {
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InfoDialog.show(context, 'Datei gespeichert.');
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}
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} on Object catch (e) {
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if (!mounted) return;
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InfoDialog.show(
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context,
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'Speichern fehlgeschlagen: $e',
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copyable: true,
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title: 'Fehler',
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);
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}
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break;
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}
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}
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List<_ActionDescriptor> _availableActions() => [
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_ActionDescriptor(
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action: FileViewingActions.openExternal,
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icon: Platform.isIOS ? Icons.ios_share : Icons.open_in_new,
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label: Platform.isIOS ? 'Extern öffnen' : 'Öffnen mit',
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),
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if (widget.remoteFile != null) ...[
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const _ActionDescriptor(
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action: FileViewingActions.sendToChat,
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icon: Icons.chat_bubble_outline,
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label: 'An Talk-Chat senden',
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),
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const _ActionDescriptor(
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action: FileViewingActions.saveToCloud,
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icon: Icons.cloud_outlined,
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label: 'In Cloud speichern',
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),
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],
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const _ActionDescriptor(
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action: FileViewingActions.share,
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icon: Icons.share_outlined,
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label: 'Teilen',
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),
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const _ActionDescriptor(
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action: FileViewingActions.save,
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icon: Icons.save_alt_outlined,
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label: 'Speichern',
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),
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];
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AppBar _appbar({
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List<Widget> actions = const [],
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bool showActionsMenu = true,
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}) => AppBar(
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title: Text(widget.path.split('/').last),
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actions: [
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...actions,
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if (showActionsMenu)
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PopupMenuButton<FileViewingActions>(
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onSelected: _handleAction,
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itemBuilder: (context) => _availableActions()
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.map(
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(a) => PopupMenuItem(
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value: a.action,
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child: ListTile(
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leading: Icon(a.icon),
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title: Text(a.label),
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dense: true,
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),
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),
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)
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.toList(),
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),
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],
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);
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@override
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Widget build(BuildContext context) {
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if (openExternal) {
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return Scaffold(
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appBar: AppBar(title: Text(widget.path.split('/').last)),
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body: const Center(child: AppProgressIndicator.large()),
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);
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}
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return FutureBuilder<_FileKind>(
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future: _fileKind,
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builder: (context, snapshot) {
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if (!snapshot.hasData) {
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return Scaffold(
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appBar: _appbar(),
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body: const Center(child: AppProgressIndicator.large()),
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);
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}
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switch (snapshot.data!) {
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case _FileKind.image:
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return _buildImageView();
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case _FileKind.svg:
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return _buildSvgView();
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case _FileKind.pdf:
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return _buildPdfView();
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case _FileKind.video:
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return _buildVideoView();
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case _FileKind.audio:
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return _buildAudioView();
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case _FileKind.text:
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return _buildTextView();
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case _FileKind.unknown:
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return _buildUnknownView();
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}
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},
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);
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}
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Widget _buildImageView() => Scaffold(
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appBar: _appbar(
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actions: [
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IconButton(
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onPressed: () {
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setState(() {
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photoViewController.rotation += pi / 2;
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});
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},
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icon: const Icon(Icons.rotate_right),
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),
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],
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),
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backgroundColor: Colors.white,
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body: PhotoView(
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controller: photoViewController,
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maxScale: 3.0,
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minScale: 0.1,
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imageProvider: Image.file(File(widget.path)).image,
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backgroundDecoration: BoxDecoration(
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color: Theme.of(context).colorScheme.surface,
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),
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),
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);
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Widget _buildSvgView() => Scaffold(
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appBar: _appbar(),
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backgroundColor: Colors.white,
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body: InteractiveViewer(
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minScale: 0.5,
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maxScale: 8,
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child: Center(
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child: SvgPicture.file(
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File(widget.path),
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placeholderBuilder: (_) =>
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const Center(child: AppProgressIndicator.large()),
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),
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),
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),
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);
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Widget _buildPdfView() =>
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Scaffold(appBar: _appbar(), body: _DeferredPdfViewer(path: widget.path));
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Widget _buildVideoView() => Scaffold(
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appBar: _appbar(),
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backgroundColor: Colors.black,
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body: _MediaPlayer(path: widget.path, isAudio: false),
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);
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Widget _buildAudioView() => Scaffold(
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appBar: _appbar(),
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body: _MediaPlayer(
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path: widget.path,
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isAudio: true,
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filename: widget.path.split('/').last,
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),
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);
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Widget _buildTextView() => Scaffold(
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appBar: _appbar(),
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body: FutureBuilder<_TextPayload>(
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future: _readTextPayload(),
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builder: (context, snapshot) {
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if (!snapshot.hasData) {
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return const Center(child: AppProgressIndicator.large());
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}
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final payload = snapshot.data!;
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final lines = const LineSplitter().convert(payload.content);
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// Stable gutter width — sized by the highest line number's digit count.
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final gutterWidth = (lines.length.toString().length * 9.0) + 16;
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return SelectionArea(
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child: Scrollbar(
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child: CustomScrollView(
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slivers: [
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if (payload.truncated)
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SliverToBoxAdapter(
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child: SelectionContainer.disabled(
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child: Container(
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width: double.infinity,
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color: Theme.of(
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context,
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).colorScheme.surfaceContainerHigh,
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padding: const EdgeInsets.symmetric(
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horizontal: 16,
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vertical: 8,
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),
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child: Text(
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'Datei ist groß — Anzeige auf die ersten ${(_textViewMaxBytes / 1024).round()} KB begrenzt.',
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style: Theme.of(context).textTheme.bodySmall,
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),
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),
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),
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),
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SliverList.builder(
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itemCount: lines.length,
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itemBuilder: (context, i) => _CodeLine(
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number: i + 1,
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text: lines[i],
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gutterWidth: gutterWidth,
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),
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),
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const SliverToBoxAdapter(child: SizedBox(height: 24)),
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],
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),
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),
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);
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},
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),
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);
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Widget _buildUnknownView() {
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final theme = Theme.of(context);
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final descriptors = _availableActions();
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return Scaffold(
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appBar: _appbar(showActionsMenu: false),
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body: ListView(
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padding: const EdgeInsets.symmetric(vertical: 24),
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children: [
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Padding(
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padding: const EdgeInsets.symmetric(horizontal: 24),
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child: Column(
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children: [
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const Icon(Icons.insert_drive_file_outlined, size: 60),
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const SizedBox(height: 16),
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Text(
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'Vorschau nicht verfügbar',
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style: theme.textTheme.titleMedium,
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textAlign: TextAlign.center,
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),
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const SizedBox(height: 6),
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Text(
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widget.path.split('/').last,
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style: theme.textTheme.titleSmall?.copyWith(
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fontWeight: FontWeight.w600,
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),
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textAlign: TextAlign.center,
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),
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const SizedBox(height: 8),
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Text(
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'Wähle eine Aktion, um mit der Datei weiterzuarbeiten.',
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style: theme.textTheme.bodySmall,
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textAlign: TextAlign.center,
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),
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],
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),
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),
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const SizedBox(height: 24),
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...descriptors.map(
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(d) => ListTile(
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leading: CenteredLeading(Icon(d.icon)),
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title: Text(d.label),
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onTap: () => _handleAction(d.action),
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),
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),
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],
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),
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);
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}
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static const int _textViewMaxBytes = 5 * 1024 * 1024;
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Future<_TextPayload> _readTextPayload() async {
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final file = File(widget.path);
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final size = await file.length();
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final ext = widget.path.split('.').last.toLowerCase();
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if (size <= _textViewMaxBytes) {
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final raw = await file.readAsString();
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return _TextPayload(content: _maybePrettify(raw, ext), truncated: false);
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}
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final raf = await file.open();
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try {
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final bytes = await raf.read(_textViewMaxBytes);
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// Truncated payloads stay raw — a parser would choke on the dangling tail.
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return _TextPayload(
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content: utf8.decode(bytes, allowMalformed: true),
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truncated: true,
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);
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|
} finally {
|
|
await raf.close();
|
|
}
|
|
}
|
|
|
|
/// Falls through to the original text on parse errors.
|
|
String _maybePrettify(String content, String ext) {
|
|
if (ext != 'json') return content;
|
|
try {
|
|
final parsed = jsonDecode(content);
|
|
return const JsonEncoder.withIndent(' ').convert(parsed);
|
|
} on Object {
|
|
return content;
|
|
}
|
|
}
|
|
}
|
|
|
|
class _ActionDescriptor {
|
|
final FileViewingActions action;
|
|
final IconData icon;
|
|
final String label;
|
|
const _ActionDescriptor({
|
|
required this.action,
|
|
required this.icon,
|
|
required this.label,
|
|
});
|
|
}
|
|
|
|
class _TextPayload {
|
|
final String content;
|
|
final bool truncated;
|
|
const _TextPayload({required this.content, required this.truncated});
|
|
}
|
|
|
|
class _MediaPlayer extends StatefulWidget {
|
|
final String path;
|
|
final bool isAudio;
|
|
final String? filename;
|
|
const _MediaPlayer({
|
|
required this.path,
|
|
required this.isAudio,
|
|
this.filename,
|
|
});
|
|
|
|
@override
|
|
State<_MediaPlayer> createState() => _MediaPlayerState();
|
|
}
|
|
|
|
class _MediaPlayerState extends State<_MediaPlayer> {
|
|
VideoPlayerController? _video;
|
|
ChewieController? _chewie;
|
|
Object? _initError;
|
|
|
|
@override
|
|
void initState() {
|
|
super.initState();
|
|
_initialize();
|
|
}
|
|
|
|
Future<void> _initialize() async {
|
|
final controller = VideoPlayerController.file(File(widget.path));
|
|
try {
|
|
await controller.initialize();
|
|
} on Object catch (e) {
|
|
await controller.dispose();
|
|
if (!mounted) return;
|
|
setState(() => _initError = e);
|
|
return;
|
|
}
|
|
if (!mounted) {
|
|
await controller.dispose();
|
|
return;
|
|
}
|
|
if (widget.isAudio) {
|
|
controller.addListener(_onAudioTick);
|
|
setState(() => _video = controller);
|
|
} else {
|
|
setState(() {
|
|
_video = controller;
|
|
_chewie = ChewieController(
|
|
videoPlayerController: controller,
|
|
autoPlay: false,
|
|
looping: false,
|
|
allowFullScreen: true,
|
|
allowPlaybackSpeedChanging: true,
|
|
);
|
|
});
|
|
}
|
|
}
|
|
|
|
void _onAudioTick() {
|
|
if (mounted) setState(() {});
|
|
}
|
|
|
|
@override
|
|
void dispose() {
|
|
_video?.removeListener(_onAudioTick);
|
|
_chewie?.dispose();
|
|
_video?.dispose();
|
|
super.dispose();
|
|
}
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
if (_initError != null) {
|
|
return Center(
|
|
child: Padding(
|
|
padding: const EdgeInsets.all(24),
|
|
child: Column(
|
|
mainAxisAlignment: MainAxisAlignment.center,
|
|
children: [
|
|
const Icon(Icons.error_outline, size: 48),
|
|
const SizedBox(height: 12),
|
|
Text(
|
|
widget.isAudio
|
|
? 'Audio kann nicht abgespielt werden'
|
|
: 'Video kann nicht abgespielt werden',
|
|
style: Theme.of(context).textTheme.titleMedium,
|
|
textAlign: TextAlign.center,
|
|
),
|
|
const SizedBox(height: 8),
|
|
Text(
|
|
'Format wird auf diesem Gerät nicht unterstützt. Über das Menü kannst du die Datei in einer anderen App öffnen.',
|
|
style: Theme.of(context).textTheme.bodySmall,
|
|
textAlign: TextAlign.center,
|
|
),
|
|
],
|
|
),
|
|
),
|
|
);
|
|
}
|
|
if (_video == null) {
|
|
return const Center(child: AppProgressIndicator.large());
|
|
}
|
|
if (widget.isAudio) {
|
|
return _AudioControls(
|
|
controller: _video!,
|
|
filename: widget.filename ?? '',
|
|
);
|
|
}
|
|
return Chewie(controller: _chewie!);
|
|
}
|
|
}
|
|
|
|
class _AudioControls extends StatelessWidget {
|
|
final VideoPlayerController controller;
|
|
final String filename;
|
|
const _AudioControls({required this.controller, required this.filename});
|
|
|
|
String _format(Duration d) {
|
|
final m = d.inMinutes.remainder(60).toString().padLeft(2, '0');
|
|
final s = d.inSeconds.remainder(60).toString().padLeft(2, '0');
|
|
if (d.inHours > 0) return '${d.inHours}:$m:$s';
|
|
return '$m:$s';
|
|
}
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
final value = controller.value;
|
|
final duration = value.duration;
|
|
final position = value.position;
|
|
final maxMs = duration.inMilliseconds == 0 ? 1 : duration.inMilliseconds;
|
|
final posMs = position.inMilliseconds.clamp(0, maxMs).toDouble();
|
|
return Center(
|
|
child: Padding(
|
|
padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 32),
|
|
child: Column(
|
|
mainAxisAlignment: MainAxisAlignment.center,
|
|
children: [
|
|
Icon(
|
|
Icons.audiotrack,
|
|
size: 96,
|
|
color: Theme.of(context).colorScheme.primary,
|
|
),
|
|
const SizedBox(height: 24),
|
|
Text(
|
|
filename,
|
|
style: Theme.of(context).textTheme.titleMedium,
|
|
textAlign: TextAlign.center,
|
|
),
|
|
const SizedBox(height: 32),
|
|
Slider(
|
|
min: 0,
|
|
max: maxMs.toDouble(),
|
|
value: posMs,
|
|
onChanged: (v) =>
|
|
controller.seekTo(Duration(milliseconds: v.toInt())),
|
|
),
|
|
Padding(
|
|
padding: const EdgeInsets.symmetric(horizontal: 16),
|
|
child: Row(
|
|
mainAxisAlignment: MainAxisAlignment.spaceBetween,
|
|
children: [
|
|
Text(
|
|
_format(position),
|
|
style: Theme.of(context).textTheme.bodySmall,
|
|
),
|
|
Text(
|
|
_format(duration),
|
|
style: Theme.of(context).textTheme.bodySmall,
|
|
),
|
|
],
|
|
),
|
|
),
|
|
const SizedBox(height: 24),
|
|
FloatingActionButton(
|
|
heroTag: 'audioPlayPause',
|
|
onPressed: () {
|
|
if (value.isPlaying) {
|
|
controller.pause();
|
|
} else {
|
|
controller.play();
|
|
}
|
|
},
|
|
child: Icon(value.isPlaying ? Icons.pause : Icons.play_arrow),
|
|
),
|
|
],
|
|
),
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
class _CodeLine extends StatelessWidget {
|
|
final int number;
|
|
final String text;
|
|
final double gutterWidth;
|
|
const _CodeLine({
|
|
required this.number,
|
|
required this.text,
|
|
required this.gutterWidth,
|
|
});
|
|
|
|
static const TextStyle _codeStyle = TextStyle(
|
|
fontFamily: 'monospace',
|
|
fontSize: 13,
|
|
height: 1.4,
|
|
);
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
final theme = Theme.of(context);
|
|
final isEven = number.isEven;
|
|
return Container(
|
|
color: isEven ? theme.colorScheme.surfaceContainerLow : null,
|
|
padding: const EdgeInsets.only(left: 4, right: 12),
|
|
child: Row(
|
|
crossAxisAlignment: CrossAxisAlignment.start,
|
|
children: [
|
|
SelectionContainer.disabled(
|
|
child: SizedBox(
|
|
width: gutterWidth,
|
|
child: Text(
|
|
'$number',
|
|
textAlign: TextAlign.right,
|
|
style: _codeStyle.copyWith(color: theme.hintColor),
|
|
),
|
|
),
|
|
),
|
|
const SizedBox(width: 8),
|
|
Expanded(child: Text(text.isEmpty ? ' ' : text, style: _codeStyle)),
|
|
],
|
|
),
|
|
);
|
|
}
|
|
}
|