add loadNext to search

lib/foundation/comic_source/comic_source.dart

@@ -384,24 +384,18 @@ enum ExplorePageType {
 typedef SearchFunction = Future<Res<List<Comic>>> Function(
     String keyword, int page, List<String> searchOption);
 
+typedef SearchNextFunction = Future<Res<List<Comic>>> Function(
+    String keyword, String? next, List<String> searchOption);
+
 class SearchPageData {
   /// If this is not null, the default value of search options will be first element.
   final List<SearchOptions>? searchOptions;
 
-  final Widget Function(BuildContext, List<String> initialValues,
-      void Function(List<String>))? customOptionsBuilder;
-
-  final Widget Function(String keyword, List<String> options)?
-      overrideSearchResultBuilder;
-
   final SearchFunction? loadPage;
 
-  final bool enableLanguageFilter;
+  final SearchNextFunction? loadNext;
 
-  const SearchPageData(this.searchOptions, this.loadPage)
-      : enableLanguageFilter = false,
-        customOptionsBuilder = null,
-        overrideSearchResultBuilder = null;
+  const SearchPageData(this.searchOptions, this.loadPage, this.loadNext);
 }
 
 class SearchOptions {

lib/foundation/comic_source/parser.dart

@@ -536,7 +536,13 @@ class ComicSourceParser {
         element['default'] == null ? null : jsonEncode(element['default']),
       ));
     }
-    return SearchPageData(options, (keyword, page, searchOption) async {
+
+    SearchFunction? loadPage;
+
+    SearchNextFunction? loadNext;
+
+    if (_checkExists('search.load')) {
+      loadPage = (keyword, page, searchOption) async {
         try {
           var res = await JsEngine().runCode("""
           ComicSource.sources.$_key.search.load(
@@ -550,7 +556,27 @@ class ComicSourceParser {
           Log.error("Network", "$e\n$s");
           return Res.error(e.toString());
         }
-    });
+      };
+    } else {
+      loadNext = (keyword, next, searchOption) async {
+        try {
+          var res = await JsEngine().runCode("""
+          ComicSource.sources.$_key.search.loadNext(
+            ${jsonEncode(keyword)}, ${jsonEncode(searchOption)}, ${jsonEncode(next)})
+        """);
+          return Res(
+            List.generate(res["comics"].length,
+                (index) => Comic.fromJson(res["comics"][index], _key!)),
+            subData: res["next"],
+          );
+        } catch (e, s) {
+          Log.error("Network", "$e\n$s");
+          return Res.error(e.toString());
+        }
+      };
+    }
+
+    return SearchPageData(options, loadPage, loadNext);
   }
 
   LoadComicFunc? _parseLoadComicFunc() {

lib/pages/search_result_page.dart

@@ -111,6 +111,7 @@ class _SearchResultPageState extends State<SearchResultPage> {
 
   @override
   Widget build(BuildContext context) {
+    var source = ComicSource.find(sourceKey);
     return ComicList(
       key: Key(text + options.toString() + sourceKey),
       errorLeading: AppSearchBar(
@@ -122,9 +123,15 @@ class _SearchResultPageState extends State<SearchResultPage> {
         onChanged: onChanged,
         action: buildAction(),
       ),
-      loadPage: (i) {
-        var source = ComicSource.find(sourceKey);
-        return source!.searchPageData!.loadPage!(
+      loadPage: source!.searchPageData!.loadPage == null ? null : (i) {
+        return source.searchPageData!.loadPage!(
+          text,
+          i,
+          options,
+        );
+      },
+      loadNext: source.searchPageData!.loadNext == null ? null : (i) {
+        return source.searchPageData!.loadNext!(
           text,
           i,
           options,