fix #1395

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/utils/calc_window_position.dart

@@ -0,0 +1,54 @@
+import 'package:PiliPlus/utils/storage_pref.dart';
+import 'package:flutter/material.dart';
+import 'package:screen_retriever/screen_retriever.dart';
+import 'package:window_manager/window_manager.dart';
+
+Future<Offset> get calcWindowPosition async {
+  Display primaryDisplay = await screenRetriever.getPrimaryDisplay();
+  List<Display> allDisplays = await screenRetriever.getAllDisplays();
+  Offset cursorScreenPoint = await screenRetriever.getCursorScreenPoint();
+
+  Display currentDisplay = allDisplays.firstWhere(
+    (display) => Rect.fromLTWH(
+      display.visiblePosition!.dx,
+      display.visiblePosition!.dy,
+      display.size.width,
+      display.size.height,
+    ).contains(cursorScreenPoint),
+    orElse: () => primaryDisplay,
+  );
+
+  num visibleWidth = currentDisplay.size.width;
+  num visibleHeight = currentDisplay.size.height;
+  num visibleStartX = 0;
+  num visibleStartY = 0;
+
+  if (currentDisplay.visibleSize != null) {
+    visibleWidth = currentDisplay.visibleSize!.width;
+    visibleHeight = currentDisplay.visibleSize!.height;
+  }
+  if (currentDisplay.visiblePosition != null) {
+    visibleStartX = currentDisplay.visiblePosition!.dx;
+    visibleStartY = currentDisplay.visiblePosition!.dy;
+  }
+
+  final windowPosition = Pref.windowPosition;
+  if (windowPosition != null) {
+    try {
+      final dx = windowPosition[0];
+      final dy = windowPosition[1];
+      if (dx >= visibleStartX &&
+          dy >= visibleStartY &&
+          dx < (visibleWidth - 30) &&
+          dy < (visibleHeight - 30)) {
+        return Offset(dx, dy);
+      }
+    } catch (_) {}
+  }
+
+  final windowSize = await windowManager.getSize();
+  return Offset(
+    visibleStartX + (visibleWidth / 2) - (windowSize.width / 2),
+    visibleStartY + ((visibleHeight / 2) - (windowSize.height / 2)),
+  );
+}