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frontend/pweb/lib/controllers/payout_volumes.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+
+
+class PayoutVolumesController extends ChangeNotifier {
+  DateTimeRange _range;
+
+  PayoutVolumesController({DateTime? now})
+      : _range = _defaultRange(now ?? DateTime.now());
+
+  DateTimeRange get range => _range;
+
+  void setRange(DateTimeRange range) {
+    final normalized = _normalizeRange(range);
+    if (_isSameRange(_range, normalized)) return;
+    _range = normalized;
+    notifyListeners();
+  }
+
+  static DateTimeRange _defaultRange(DateTime now) {
+    final local = now.toLocal();
+    final start = DateTime(local.year, local.month, 1);
+    final end = DateTime(
+      local.year,
+      local.month,
+      local.day,
+    );
+    return DateTimeRange(start: start, end: end);
+  }
+
+  static DateTimeRange _normalizeRange(DateTimeRange range) {
+    final start = DateTime(range.start.year, range.start.month, range.start.day);
+    final end = DateTime(
+      range.end.year,
+      range.end.month,
+      range.end.day,
+    );
+    return DateTimeRange(start: start, end: end);
+  }
+
+  static bool _isSameRange(DateTimeRange a, DateTimeRange b) {
+    return a.start.isAtSameMomentAs(b.start) &&
+        a.end.isAtSameMomentAs(b.end);
+  }
+}