⚡ Improve attachments queue performance

lib/controllers/post_editor_controller.dart

@@ -115,10 +115,10 @@ class PostEditorController extends GetxController {
       builder: (context) => AttachmentEditorPopup(
         usage: 'i.attachment',
         initialAttachments: attachments,
-        onAdd: (value) {
+        onAdd: (int value) {
           attachments.add(value);
         },
-        onRemove: (value) {
+        onRemove: (int value) {
           attachments.remove(value);
         },
       ),

lib/providers/attachment_uploader.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:io';
 import 'dart:typed_data';
 
@@ -26,11 +27,40 @@ class AttachmentUploaderController extends GetxController {
   RxDouble progressOfUpload = 0.0.obs;
   RxList<AttachmentUploadTask> queueOfUpload = RxList.empty(growable: true);
 
+  Timer? _progressSyncTimer;
+  double _progressOfUpload = 0.0;
+
+  void _syncProgress() {
+    progressOfUpload.value = _progressOfUpload;
+    queueOfUpload.refresh();
+  }
+
+  void _startProgressSyncTimer() {
+    if (_progressSyncTimer != null) {
+      _progressSyncTimer!.cancel();
+    }
+    _progressSyncTimer = Timer.periodic(
+      const Duration(milliseconds: 500),
+      (_) => _syncProgress(),
+    );
+  }
+
+  void _stopProgressSyncTimer() {
+    if (_progressSyncTimer == null) return;
+    _progressSyncTimer!.cancel();
+    _progressSyncTimer = null;
+  }
+
   void enqueueTask(AttachmentUploadTask task) {
     if (isUploading.value) throw Exception('uploading blocked');
     queueOfUpload.add(task);
   }
 
+  void enqueueTaskBatch(Iterable<AttachmentUploadTask> tasks) {
+    if (isUploading.value) throw Exception('uploading blocked');
+    queueOfUpload.addAll(tasks);
+  }
+
   void dequeueTask(AttachmentUploadTask task) {
     if (isUploading.value) throw Exception('uploading blocked');
     queueOfUpload.remove(task);
@@ -40,8 +70,8 @@ class AttachmentUploaderController extends GetxController {
     isUploading.value = true;
     progressOfUpload.value = 0;
 
+    _startProgressSyncTimer();
     queueOfUpload[queueIndex].isUploading = true;
-    queueOfUpload.refresh();
 
     final task = queueOfUpload[queueIndex];
     final result = await _rawUploadAttachment(
@@ -51,13 +81,13 @@ class AttachmentUploaderController extends GetxController {
       null,
       onProgress: (value) {
         queueOfUpload[queueIndex].progress = value;
-        queueOfUpload.refresh();
-        progressOfUpload.value = value;
+        _progressOfUpload = value;
       },
     );
 
     queueOfUpload.removeAt(queueIndex);
-    queueOfUpload.refresh();
+    _stopProgressSyncTimer();
+    _syncProgress();
 
     isUploading.value = false;
 
@@ -70,9 +100,10 @@ class AttachmentUploaderController extends GetxController {
     isUploading.value = true;
     progressOfUpload.value = 0;
 
+    _startProgressSyncTimer();
+
     for (var idx = 0; idx < queueOfUpload.length; idx++) {
       queueOfUpload[idx].isUploading = true;
-      queueOfUpload.refresh();
 
       final task = queueOfUpload[idx];
       final result = await _rawUploadAttachment(
@@ -82,20 +113,20 @@ class AttachmentUploaderController extends GetxController {
         null,
         onProgress: (value) {
           queueOfUpload[idx].progress = value;
-          queueOfUpload.refresh();
-          progressOfUpload.value = (idx + value) / queueOfUpload.length;
+          _progressOfUpload = (idx + value) / queueOfUpload.length;
         },
       );
-      progressOfUpload.value = (idx + 1) / queueOfUpload.length;
+      _progressOfUpload = (idx + 1) / queueOfUpload.length;
       onData(result);
 
       queueOfUpload[idx].isUploading = false;
       queueOfUpload[idx].isCompleted = false;
-      queueOfUpload.refresh();
     }
 
     queueOfUpload.clear();
-    queueOfUpload.refresh();
+    _stopProgressSyncTimer();
+    _syncProgress();
+
     isUploading.value = false;
   }
 

lib/widgets/attachments/attachment_editor.dart

@@ -56,12 +56,10 @@ class _AttachmentEditorPopupState extends State<AttachmentEditorPopup> {
     final medias = await _imagePicker.pickMultiImage();
     if (medias.isEmpty) return;
 
-    for (final media in medias) {
-      final file = File(media.path);
-      _enqueueTask(
-        AttachmentUploadTask(file: file, usage: widget.usage),
-      );
-    }
+    _enqueueTaskBatch(medias.map((x) {
+      final file = File(x.path);
+      return AttachmentUploadTask(file: file, usage: widget.usage);
+    }));
   }
 
   Future<void> _pickVideoToUpload() async {
@@ -88,11 +86,9 @@ class _AttachmentEditorPopupState extends State<AttachmentEditorPopup> {
 
     List<File> files = result.paths.map((path) => File(path!)).toList();
 
-    for (final file in files) {
-      _enqueueTask(
-        AttachmentUploadTask(file: file, usage: widget.usage),
-      );
-    }
+    _enqueueTaskBatch(files.map((x) {
+      return AttachmentUploadTask(file: x, usage: widget.usage);
+    }));
   }
 
   Future<void> _takeMediaToUpload(bool isVideo) async {
@@ -159,7 +155,11 @@ class _AttachmentEditorPopupState extends State<AttachmentEditorPopup> {
       _isFirstTimeBusy = false;
       return;
     } else {
-      _attachments = List.filled(widget.initialAttachments.length, null);
+      _attachments = List.filled(
+        widget.initialAttachments.length,
+        null,
+        growable: true,
+      );
     }
 
     setState(() => _isBusy = true);
@@ -239,20 +239,9 @@ class _AttachmentEditorPopupState extends State<AttachmentEditorPopup> {
                             fontFamily: 'monospace',
                           ),
                         ),
-                        FutureBuilder(
-                          future: element.file.length(),
-                          builder: (context, snapshot) {
-                            if (!snapshot.hasData) {
-                              return const Text(
-                                '- Bytes',
-                                style: TextStyle(fontSize: 12),
-                              );
-                            }
-                            return Text(
-                              _formatBytes(snapshot.data!),
+                        Text(
+                          'In queue #${index + 1}',
                           style: const TextStyle(fontSize: 12),
-                            );
-                          },
                         ),
                       ],
                     ),
@@ -410,6 +399,13 @@ class _AttachmentEditorPopupState extends State<AttachmentEditorPopup> {
     }
   }
 
+  void _enqueueTaskBatch(Iterable<AttachmentUploadTask> tasks) {
+    _uploadController.enqueueTaskBatch(tasks);
+    if (_isAutoUpload) {
+      _startUploading();
+    }
+  }
+
   void _startUploading() {
     _uploadController.performUploadQueue(onData: (r) {
       widget.onAdd(r.id);
@@ -433,11 +429,10 @@ class _AttachmentEditorPopupState extends State<AttachmentEditorPopup> {
       child: DropTarget(
         onDragDone: (detail) async {
           if (_uploadController.isUploading.value) return;
-          for (final file in detail.files) {
-            _enqueueTask(
-              AttachmentUploadTask(file: File(file.path), usage: widget.usage),
-            );
-          }
+          _enqueueTaskBatch(detail.files.map((x) {
+            final file = File(x.path);
+            return AttachmentUploadTask(file: file, usage: widget.usage);
+          }));
         },
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,