Add multiDateEventHeaderStyle.maxEventCount

lib/src/components/all_day_overflow.dart

@@ -0,0 +1,30 @@
+import 'package:black_hole_flutter/black_hole_flutter.dart';
+import 'package:flutter/material.dart';
+
+import '../event/all_day.dart';
+import '../event/basic.dart';
+import '../localization.dart';
+import '../utils.dart';
+
+class AllDayOverflow extends StatelessWidget {
+  AllDayOverflow(this.date, {super.key, required this.overflowCount})
+      : assert(date.debugCheckIsValidTimetableDate()),
+        assert(overflowCount >= 1);
+
+  final DateTime date;
+  final int overflowCount;
+
+  @override
+  Widget build(BuildContext context) {
+    return BasicAllDayEventWidget(
+      BasicEvent(
+        id: date,
+        title: TimetableLocalizations.of(context).allDayOverflow(overflowCount),
+        backgroundColor: context.theme.backgroundColor.withOpacity(0),
+        start: date,
+        end: date.atEndOfDay,
+      ),
+      info: AllDayEventLayoutInfo(hiddenStartDays: 0, hiddenEndDays: 0),
+    );
+  }
+}