fixed error on pdf viewer transition

lib/widget/file_viewer/deferred_pdf_viewer.dart

@@ -3,51 +3,16 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';
 
-import '../app_progress_indicator.dart';
+import '../route_transition_gate.dart';
 
 /// SfPdfViewer asserts on `localToGlobal` if mounted during the page-push
 /// animation. Defer until the route enter animation completes.
-class DeferredPdfViewer extends StatefulWidget {
+class DeferredPdfViewer extends StatelessWidget {
   const DeferredPdfViewer({super.key, required this.path});
   final String path;
 
   @override
-  State<DeferredPdfViewer> createState() => _DeferredPdfViewerState();
-}
-
-class _DeferredPdfViewerState extends State<DeferredPdfViewer> {
-  bool _ready = false;
-  Animation<double>? _routeAnimation;
-
-  @override
-  void didChangeDependencies() {
-    super.didChangeDependencies();
-    if (_ready || _routeAnimation != null) return;
-    final animation = ModalRoute.of(context)?.animation;
-    if (animation == null || animation.isCompleted) {
-      _ready = true;
-      return;
-    }
-    _routeAnimation = animation..addStatusListener(_onAnimationStatus);
-  }
-
-  void _onAnimationStatus(AnimationStatus status) {
-    if (status == AnimationStatus.completed && mounted) {
-      setState(() => _ready = true);
-    }
-  }
-
-  @override
-  void dispose() {
-    _routeAnimation?.removeStatusListener(_onAnimationStatus);
-    super.dispose();
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    if (!_ready) {
-      return const Center(child: AppProgressIndicator.large());
-    }
-    return SfPdfViewer.file(File(widget.path));
-  }
+  Widget build(BuildContext context) => RouteTransitionGate(
+    builder: (context) => SfPdfViewer.file(File(path)),
+  );
 }