added support for simultan downloads in files and talk, support for background downloads, enhanced loading in files with retry

lib/view/pages/talk/widgets/chat_bubble.dart

@@ -5,13 +5,11 @@ import '../../../../api/marianumcloud/talk/chat/get_chat_response.dart';
 import '../../../../api/marianumcloud/talk/room/get_room_response.dart';
 import '../../../../extensions/date_time.dart';
 import '../../../../extensions/text.dart';
-import '../../../../routing/app_routes.dart';
 import '../../../../share_intent/remote_file_ref.dart';
 import '../../../../state/app/modules/chat/bloc/chat_bloc.dart';
-import '../../../../utils/download_manager.dart';
+import '../../../../utils/downloads/download_job.dart';
 import '../../../../utils/haptics.dart';
-import '../../../../widget/confirm_dialog.dart';
-import '../../../../widget/info_dialog.dart';
+import '../../../../widget/downloads/download_trigger.dart';
 import '../data/chat_bubble_styles.dart';
 import '../data/chat_message.dart';
 import 'answer_reference.dart';
@@ -58,97 +56,40 @@ class ChatBubble extends StatefulWidget {
 }
 
 class _ChatBubbleState extends State<ChatBubble>
-    with SingleTickerProviderStateMixin {
+    with SingleTickerProviderStateMixin, DownloadTrigger<ChatBubble> {
   late ChatMessage message;
-  DownloadJob? _job;
 
   Offset _position = Offset.zero;
   Offset _dragStartPosition = Offset.zero;
   bool _swipeActionArmed = false;
 
+  @override
+  String? get downloadRemotePath =>
+      widget.bubbleData.messageParameters?['file']?.path;
+
   @override
   void initState() {
     super.initState();
-    final filePath = widget.bubbleData.messageParameters?['file']?.path;
-    if (filePath != null) _attachJob(DownloadManager.instance.jobFor(filePath));
+    initDownloadTrigger();
+  }
+
+  @override
+  void didUpdateWidget(covariant ChatBubble oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    final oldPath = oldWidget.bubbleData.messageParameters?['file']?.path;
+    if (oldPath != downloadRemotePath) refreshDownloadTrigger();
   }
 
   @override
   void dispose() {
-    _detachJob();
+    disposeDownloadTrigger();
     super.dispose();
   }
 
-  void _attachJob(DownloadJob? job) {
-    _job = job;
-    if (job == null) return;
-    job.status.addListener(_onStatusChange);
-    if (job.isFinished) {
-      WidgetsBinding.instance.addPostFrameCallback((_) => _onStatusChange());
-    }
-  }
-
-  void _detachJob() {
-    _job?.status.removeListener(_onStatusChange);
-    _job = null;
-  }
-
-  void _onStatusChange() {
-    if (!mounted) return;
-    final job = _job;
-    if (job == null) return;
-    final status = job.status.value;
-    if (status is DownloadDone) {
-      Haptics.success();
-      DownloadManager.instance.clear(job.remotePath);
-      _detachJob();
-      final talkFile = message.file;
-      AppRoutes.openFileViewer(
-        context,
-        status.localPath,
-        remoteFile: talkFile != null
-            ? RemoteFileRef.fromTalk(talkFile)
-            : null,
-      );
-      setState(() {});
-    } else if (status is DownloadFailed) {
-      final message = status.message;
-      DownloadManager.instance.clear(job.remotePath);
-      _detachJob();
-      setState(() {});
-      InfoDialog.show(context, message, title: 'Download fehlgeschlagen');
-    } else if (status is DownloadCancelled) {
-      DownloadManager.instance.clear(job.remotePath);
-      _detachJob();
-      setState(() {});
-    } else {
-      setState(() {});
-    }
-  }
-
-  Future<void> _startFileDownload() async {
+  void _startFileDownload() {
     final file = message.file;
-    final filePath = file?.path;
-    if (file == null || filePath == null) return;
-    final job = await DownloadManager.instance.start(
-      remotePath: filePath,
-      name: file.name,
-    );
-    if (!mounted) return;
-    if (_job == job) return;
-    _detachJob();
-    _attachJob(job);
-    setState(() {});
-  }
-
-  void _confirmCancel() {
-    ConfirmDialog(
-      title: 'Download abbrechen?',
-      content: 'Möchtest du den Download abbrechen?',
-      confirmButton: 'Ja, Abbrechen',
-      cancelButton: 'Nein',
-      onConfirm: () => _job?.cancel(),
-    ).asDialog(context);
+    if (file == null) return;
+    startDownload(name: file.name, remoteFile: RemoteFileRef.fromTalk(file));
   }
 
   bool get _rendersAsCommentBubble =>
@@ -236,8 +177,8 @@ class _ChatBubbleState extends State<ChatBubble>
       return;
     }
     if (message.file == null) return;
-    if (_job?.status.value is DownloadInProgress) {
-      _confirmCancel();
+    if (isDownloading) {
+      confirmCancelDownload();
     } else {
       _startFileDownload();
     }
@@ -349,7 +290,7 @@ class _ChatBubbleState extends State<ChatBubble>
                 timeIconColor: widget.timeIconColor,
                 showActorDisplayName: showActorDisplayName,
                 showBubbleTime: showBubbleTime,
-                downloadJob: _job,
+                downloadJob: downloadJob,
               ),
             ),
           ),

lib/view/pages/talk/widgets/chat_textfield.dart

@@ -13,6 +13,7 @@ import '../../../../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../../../../state/app/modules/settings/bloc/settings_cubit.dart';
 import '../../../../widget/async_action_button.dart';
 import '../../../../widget/details_bottom_sheet.dart';
+import '../../../../widget/downloads/download_tray.dart';
 import '../../../../widget/emoji_picker_dialog.dart';
 import '../../../../widget/file_pick.dart';
 import '../../../../widget/focus_behaviour.dart';
@@ -34,8 +35,17 @@ class _ChatTextfieldState extends State<ChatTextfield> {
   final TextEditingController _textBoxController = TextEditingController();
   final AsyncActionController _sendController = AsyncActionController();
   final FocusNode _focusNode = FocusNode();
+  final GlobalKey _sizeKey = GlobalKey();
   String? _sendError;
 
+  /// Publishes the input bar's measured height so the downloads chip floats
+  /// above it instead of covering it.
+  void _publishHeight() {
+    if (!mounted) return;
+    final height = _sizeKey.currentContext?.size?.height;
+    if (height != null) downloadChipBottomObstruction.value = height;
+  }
+
   void share(List<String> uploadedRemotePaths) {
     shareFilesToChat(
       token: widget.sendToToken,
@@ -104,6 +114,7 @@ class _ChatTextfieldState extends State<ChatTextfield> {
 
   @override
   void dispose() {
+    downloadChipBottomObstruction.value = 0;
     _sendController.dispose();
     _focusNode.dispose();
     super.dispose();
@@ -236,7 +247,9 @@ class _ChatTextfieldState extends State<ChatTextfield> {
       }
     }
 
+    WidgetsBinding.instance.addPostFrameCallback((_) => _publishHeight());
     return Stack(
+      key: _sizeKey,
       children: <Widget>[
         Align(
           alignment: Alignment.bottomLeft,