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lib/components/DownloadsScreen/download_missing_images_button.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+import 'package:get_it/get_it.dart';
+
+import '../../services/downloads_helper.dart';
+import '../../services/finamp_settings_helper.dart';
+
+class DownloadMissingImagesButton extends StatefulWidget {
+  const DownloadMissingImagesButton({Key? key}) : super(key: key);
+
+  @override
+  State<DownloadMissingImagesButton> createState() =>
+      _DownloadMissingImagesButtonState();
+}
+
+class _DownloadMissingImagesButtonState
+    extends State<DownloadMissingImagesButton> {
+  final _downloadsHelper = GetIt.instance<DownloadsHelper>();
+
+  // The user shouldn't be able to check for missing downloads while offline
+  bool _enabled = !FinampSettingsHelper.finampSettings.isOffline;
+
+  void downloadImages() async {
+    // We don't want two checks to happen at once, so we disable the
+    // button while a check is running (it shouldn't take long enough
+    // for the user to be able to press twice, but you never know)
+    setState(() {
+      _enabled = false;
+    });
+
+    final imagesDownloaded = await _downloadsHelper.downloadMissingImages();
+
+    if (!mounted) return;
+
+    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+      content: Text(AppLocalizations.of(context)!
+          .downloadedMissingImages(imagesDownloaded)),
+    ));
+
+    setState(() {
+      _enabled = true;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return IconButton(
+      onPressed: _enabled ? () => downloadImages() : null,
+      icon: const Icon(Icons.image),
+      tooltip: AppLocalizations.of(context)!.downloadMissingImages,
+    );
+  }
+}