68 lines
2.3 KiB
Dart
68 lines
2.3 KiB
Dart
import 'dart:async';
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import 'dart:io';
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import 'package:flutter/material.dart';
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import '../../routing/app_routes.dart';
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import '../../utils/downloads/download_job.dart';
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import '../../utils/downloads/download_manager.dart';
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import '../../utils/haptics.dart';
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import '../confirm_dialog.dart';
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import '../info_dialog.dart';
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/// Verifies a finished download's cache file is still on disk before opening.
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///
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/// Downloads live in the app's temp dir, which Android may clear at any time
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/// (storage pressure, "Cache leeren") — while completion notifications and
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/// tray entries stay tappable indefinitely. Returns true when the file exists;
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/// otherwise drops the stale job (incl. its notification) and offers a
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/// re-download when the remote path is known (it isn't for notification taps
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/// whose task metadata got lost).
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bool ensureDownloadStillExists(BuildContext context, DownloadJob job) {
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final path = job.localPath;
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if (path == null || File(path).existsSync()) return true;
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DownloadManager.instance.markOpened(job);
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showFileGoneDialog(
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context,
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subject: 'Die heruntergeladene Datei',
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onRedownload: job.remotePath.isEmpty
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? null
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: () => unawaited(DownloadManager.instance.retry(job)),
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);
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return false;
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}
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/// Opens a finished download in the viewer, unless its file vanished.
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void openFinishedDownload(BuildContext context, DownloadJob job, String path) {
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if (!ensureDownloadStillExists(context, job)) return;
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DownloadManager.instance.markOpened(job);
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Haptics.success();
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AppRoutes.openFileViewer(context, path, remoteFile: job.remoteFile);
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}
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/// Tells the user that the system cleared a cached file ([subject], e.g.
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/// "Die Datei") and offers a re-download when [onRedownload] is given.
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void showFileGoneDialog(
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BuildContext context, {
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required String subject,
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VoidCallback? onRedownload,
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}) {
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const title = 'Datei nicht mehr verfügbar';
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final gone = '$subject wurde vom System aus dem Zwischenspeicher entfernt.';
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if (onRedownload == null) {
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InfoDialog.show(
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context,
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'$gone Bitte lade sie erneut herunter.',
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title: title,
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);
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return;
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}
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ConfirmDialog(
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title: title,
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content: '$gone\nErneut herunterladen?',
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confirmButton: 'Herunterladen',
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onConfirm: onRedownload,
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).asDialog(context);
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}
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