⚡ Optimize chat list and attachment loading

ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -59,6 +59,7 @@
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
       debugServiceExtension = "internal"
+      showGraphicsOverview = "Yes"
       allowLocationSimulation = "YES">
       <BuildableProductRunnable
          runnableDebuggingMode = "0">

lib/providers/content/attachment.dart

@@ -23,6 +23,21 @@ class AttachmentProvider extends GetConnect {
 
   final Map<String, Attachment> _cachedResponses = {};
 
+  List<Attachment?> listMetadataFromCache(List<String> rid) {
+    if (rid.isEmpty) return List.empty();
+
+    List<Attachment?> result = List.filled(rid.length, null);
+    for (var idx = 0; idx < rid.length; idx++) {
+      if (_cachedResponses.containsKey(rid[idx])) {
+        result[idx] = _cachedResponses[rid[idx]];
+      } else {
+        result[idx] = null;
+      }
+    }
+
+    return result;
+  }
+
   Future<List<Attachment?>> listMetadata(
     List<String> rid, {
     noCache = false,

lib/screens/dashboard.dart

@@ -529,7 +529,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
                 style: TextStyle(color: _unFocusColor, fontSize: 12),
               )
             ],
-          ).paddingAll(8),
+          ).paddingOnly(left: 8, right: 8, top: 8, bottom: 50),
         ],
       ),
     );

lib/widgets/attachments/attachment_list.dart

@@ -134,7 +134,17 @@ class _AttachmentListState extends State<AttachmentList> {
     super.initState();
     assert(widget.attachmentIds != null || widget.attachments != null);
     if (widget.attachments == null) {
-      _getMetadataList();
+      final AttachmentProvider attach = Get.find();
+      final cachedResult = attach.listMetadataFromCache(widget.attachmentIds!);
+      if (cachedResult.every((x) => x != null)) {
+        setState(() {
+          _attachments = cachedResult;
+          _isLoading = false;
+        });
+        _calculateAspectRatio();
+      } else {
+        _getMetadataList();
+      }
     } else {
       setState(() {
         _attachments = widget.attachments!;
@@ -176,7 +186,10 @@ class _AttachmentListState extends State<AttachmentList> {
 
     if (widget.isFullWidth && _attachments.length == 1) {
       final element = _attachments.first;
-      double ratio = element!.metadata?['ratio']?.toDouble() ?? 16 / 9;
+      double ratio = math.max(
+        element!.metadata?['ratio']?.toDouble() ?? 16 / 9,
+        0.5,
+      );
       return Container(
         width: MediaQuery.of(context).size.width,
         constraints: BoxConstraints(
@@ -243,7 +256,10 @@ class _AttachmentListState extends State<AttachmentList> {
           final element = _attachments[idx];
           idx++;
           if (element == null) return const SizedBox.shrink();
-          double ratio = element.metadata?['ratio']?.toDouble() ?? 16 / 9;
+          double ratio = math.max(
+            element.metadata?['ratio']?.toDouble() ?? 16 / 9,
+            0.5,
+          );
           return Container(
             constraints: BoxConstraints(
               maxWidth: widget.columnMaxWidth,
@@ -282,7 +298,10 @@ class _AttachmentListState extends State<AttachmentList> {
         itemBuilder: (context, idx) {
           final element = _attachments[idx];
           if (element == null) const SizedBox.shrink();
-          final ratio = element!.metadata?['ratio']?.toDouble() ?? 16 / 9;
+          double ratio = math.max(
+            element!.metadata?['ratio']?.toDouble() ?? 16 / 9,
+            0.5,
+          );
           return Container(
             constraints: BoxConstraints(
               maxWidth: math.min(

lib/widgets/chat/chat_event_list.dart

@@ -37,6 +37,7 @@ class ChatEventList extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return CustomScrollView(
+      cacheExtent: 100,
       reverse: true,
       slivers: [
         Obx(() {