Allow multiple map routes to share the Map widget and transition between each other

lib/src/utils/translucent_route.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/material.dart';
+
+class TranslucentRoute<T> extends TransitionRoute<T> {
+  final bool _opaque;
+  final Duration _transitionDuration;
+  final Widget Function(
+      BuildContext context,
+      Animation<double> animation,
+      Animation<double> secondaryAnimation,
+      Widget child
+    ) _transitionBuilder;
+  final Widget Function(BuildContext) _pageBuilder;
+
+  TranslucentRoute({
+    opaque = true,
+    transitionDuration = const Duration(milliseconds: 300),
+    required Widget Function(
+        BuildContext context,
+        Animation<double> animation,
+        Animation<double> secondaryAnimation,
+        Widget child
+      ) transitionBuilder,
+    required Widget Function(BuildContext) pageBuilder,
+    RouteSettings? settings,
+  }):
+    _opaque = opaque,
+    _transitionDuration = transitionDuration,
+    _transitionBuilder = transitionBuilder,
+    _pageBuilder = pageBuilder,
+    super(settings: settings);
+
+  @override
+  Iterable<OverlayEntry> createOverlayEntries() {
+    return <OverlayEntry>[
+      OverlayEntry(
+        builder: (context) => _transitionBuilder(
+          context,
+          animation!,
+          secondaryAnimation!,
+          _pageBuilder(context),
+        ),
+      ),
+    ];
+  }
+
+  @override
+  bool get opaque => _opaque;
+
+  @override
+  Duration get transitionDuration => _transitionDuration;
+}