Add callback setting

lib/foundation/comic_source/comic_source.dart

@@ -6,6 +6,7 @@ import 'dart:convert';
 import 'dart:math' as math;
 
 import 'package:flutter/widgets.dart';
+import 'package:flutter_qjs/flutter_qjs.dart';
 import 'package:venera/foundation/app.dart';
 import 'package:venera/foundation/comic_type.dart';
 import 'package:venera/foundation/history.dart';
@@ -203,7 +204,7 @@ class ComicSource {
 
   final LikeCommentFunc? likeCommentFunc;
 
-  final Map<String, dynamic>? settings;
+  final Map<String, Map<String, dynamic>>? settings;
 
   final Map<String, Map<String, String>>? translations;
 

lib/foundation/comic_source/parser.dart

@@ -923,8 +923,30 @@ class ComicSourceParser {
     };
   }
 
-  Map<String, dynamic> _parseSettings() {
-    return _getValue("settings") ?? {};
+  Map<String, Map<String, dynamic>> _parseSettings() {
+    var value = _getValue("settings");
+    if (value is Map) {
+      var newMap = <String, Map<String, dynamic>>{};
+      for (var e in value.entries) {
+        if (e.key is! String) {
+          continue;
+        }
+        var v = <String, dynamic>{};
+        for (var e2 in e.value.entries) {
+          if (e2.key is! String) {
+            continue;
+          }
+          var v2 = e2.value;
+          if (v2 is JSInvokable) {
+            v2 = JSAutoFreeFunction(v2);
+          }
+          v[e2.key] = v2;
+        }
+        newMap[e.key] = v;
+      }
+      return newMap;
+    }
+    return {};
   }
 
   RegExp? _parseIdMatch() {

lib/foundation/js_engine.dart

@@ -165,7 +165,7 @@ class JsEngine with _JSEngineApi {
               String settingKey = message["setting_key"];
               var source = ComicSource.find(key)!;
               return source.data["settings"]?[settingKey] ??
-                  source.settings?[settingKey]['default'] ??
+                  source.settings?[settingKey]!['default'] ??
                   (throw "Setting not found: $settingKey");
             }
           case "isLogged":
@@ -688,3 +688,20 @@ class DocumentWrapper {
     return elements.length - 1;
   }
 }
+
+class JSAutoFreeFunction {
+  final JSInvokable func;
+
+  /// Automatically free the function when it's not used anymore
+  JSAutoFreeFunction(this.func) {
+    finalizer.attach(this, func);
+  }
+
+  dynamic call(List<dynamic> args) {
+    return func(args);
+  }
+
+  static final finalizer = Finalizer<JSInvokable>((func) {
+    func.free();
+  });
+}

lib/pages/comic_source_page.dart

@@ -244,6 +244,8 @@ class _BodyState extends State<_Body> {
               },
             ),
           );
+        } else if (type == "callback") {
+          yield _CallbackSetting(setting: item);
         }
       } catch (e, s) {
         Log.error("ComicSourcePage", "Failed to build a setting\n$e\n$s");
@@ -677,3 +679,48 @@ class _CheckUpdatesButtonState extends State<_CheckUpdatesButton> {
     ).fixHeight(32);
   }
 }
+
+class _CallbackSetting extends StatefulWidget {
+  const _CallbackSetting({required this.setting});
+
+  final MapEntry<String, Map<String, dynamic>> setting;
+
+  @override
+  State<_CallbackSetting> createState() => _CallbackSettingState();
+}
+
+class _CallbackSettingState extends State<_CallbackSetting> {
+  String get key => widget.setting.key;
+
+  String get buttonText => widget.setting.value['buttonText'] ?? "Click";
+
+  String get title => widget.setting.value['title'] ?? key;
+
+  bool isLoading = false;
+
+  Future<void> onClick() async {
+    var func = widget.setting.value['callback'];
+    var result = func([]);
+    if (result is Future) {
+      setState(() {
+        isLoading = true;
+      });
+      await result;
+      setState(() {
+        isLoading = false;
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      title: Text(title.ts(key)),
+      trailing: Button.normal(
+        onPressed: onClick,
+        isLoading: isLoading,
+        child: Text(buttonText.ts(key)),
+      ).fixHeight(32),
+    );
+  }
+}