Fix the issue of the comic list loading infinitely. Close #584

lib/components/comic.dart

@@ -1159,7 +1159,7 @@ class ComicListState extends State<ComicList> {
           if (res.data.isEmpty) {
             setState(() {
               _data[page] = const [];
-              _maxPage = page;
+              _maxPage ??= page;
             });
           } else {
             setState(() {
@@ -1282,8 +1282,8 @@ class ComicListState extends State<ComicList> {
         ],
       );
     }
-    if (_data[_page] == null) {
-      _loadPage(_page);
+    if (_data[1] == null) {
+      _loadPage(1);
       return Column(
         children: [
           if (widget.errorLeading != null) widget.errorLeading!,
@@ -1304,7 +1304,7 @@ class ComicListState extends State<ComicList> {
           comics: _data.values.expand((element) => element).toList(),
           menuBuilder: widget.menuBuilder,
           onLastItemBuild: () {
-            if (_error == null && (_maxPage == null || _page < _maxPage!)) {
+            if (_error == null && (_maxPage == null || _data.length < _maxPage!)) {
               _loadPage(_data.length + 1);
             }
           },
@@ -1334,7 +1334,7 @@ class ComicListState extends State<ComicList> {
               ],
             ).paddingHorizontal(16).paddingVertical(8),
           )
-        else if (_maxPage == null || _page < _maxPage!)
+        else if (_maxPage == null || _data.length < _maxPage!)
           const SliverListLoadingIndicator(),
         if (widget.trailingSliver != null) widget.trailingSliver!,
       ],

lib/network/images.dart

@@ -181,7 +181,15 @@ abstract class ImageDownloader {
         }
 
         if (configs['onResponse'] is JSInvokable) {
-          buffer = (configs['onResponse'] as JSInvokable)([Uint8List.fromList(buffer)]);
+          dynamic result = (configs['onResponse'] as JSInvokable)([Uint8List.fromList(buffer)]);
+          if (result is Future) {
+            result = await result;
+          }
+          if (result is List<int>) {
+            buffer = result;
+          } else {
+            throw "Error: Invalid onResponse result.";
+          }
           (configs['onResponse'] as JSInvokable).free();
         }