define a type for id and use uuids instead of existing int

example/lib/dynamic_widget_example.dart

@@ -12,6 +12,11 @@ class DynamicWidgetExample extends StatefulWidget {
 class _DynamicWidgetExampleState extends State<DynamicWidgetExample> {
   final LazyCanvasController controller = LazyCanvasController(debug: false);
 
+  // Store child IDs for later reference
+  late CanvasChildId selfManagedId;
+  late CanvasChildId externalDataId;
+  late CanvasChildId reactiveId;
+
   // Simulate some dynamic data
   int counter = 0;
   String message = "Hello World";
@@ -25,16 +30,16 @@ class _DynamicWidgetExampleState extends State<DynamicWidgetExample> {
 
   void _setupWidgets() {
     // Approach 1: Using StatefulWidget with state inside the widget getting lost if unmounted
-    controller.addChild(const Offset(0, 0), SelfManagedCounterWidget(label: "Self-Managed"));
+    selfManagedId = controller.addChild(const Offset(0, 0), SelfManagedCounterWidget(label: "Self-Managed"));
 
     // Approach 2: Using updateChildWidget, you need this since the children dep tree is direcly managed by the controller
-    controller.addChild(
+    externalDataId = controller.addChild(
       const Offset(200, 0),
       ExternalDataWidget(counter: counter, message: message, color: selectedColor),
     );
 
     // Approach 3: Using ValueListenableBuilder for reactive updates
-    controller.addChild(
+    reactiveId = controller.addChild(
       const Offset(400, 0),
       ValueListenableBuilder<int>(
         valueListenable: _counterNotifier,
@@ -71,7 +76,7 @@ class _DynamicWidgetExampleState extends State<DynamicWidgetExample> {
     // Approach 2: Update the widget when external data changes
     // Use ValueKey to ensure Flutter recognizes this as a different widget
     controller.updateChildWidget(
-      1, // Widget ID (second widget added)
+      externalDataId, // Use the stored widget ID
       ExternalDataWidget(
         // key: ValueKey('external_$counter'), // Force rebuild with unique key
         counter: counter,

example/lib/simple_example.dart

@@ -12,21 +12,23 @@ class SimpleExample extends StatefulWidget {
 
 class _SimpleExampleState extends State<SimpleExample> {
   final LazyCanvasController controller = LazyCanvasController(debug: true);
+  final List<CanvasChildId> childIds = [];
 
   @override
   void initState() {
     super.initState();
     for (int i = 0; i < 10; i++) {
-      controller.addChild(
+      final id = controller.addChild(
         Offset((i % 80) * 100.0, (i ~/ 80) * 100.0),
         GestureDetector(
           onTap: () {
             ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Tapped a container')));
-            controller.focusOnChild(i);
+            controller.focusOnChild(childIds[i]);
           },
           child: InfoContainer(color: Colors.primaries[i % Colors.primaries.length]),
         ),
       );
+      childIds.add(id);
     }
     controller.addChild(
       const Offset(0, 200),

example/pubspec.lock

@@ -41,6 +41,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.19.1"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      sha256: "1e445881f28f22d6140f181e07737b22f1e099a5e1ff94b0af2f9e4a463f4855"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.6"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -57,6 +65,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.3"
+  fixnum:
+    dependency: transitive
+    description:
+      name: fixnum
+      sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -159,6 +175,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.10.1"
+  sprintf:
+    dependency: transitive
+    description:
+      name: sprintf
+      sha256: "1fc9ffe69d4df602376b52949af107d8f5703b77cda567c4d7d86a0693120f23"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.0"
   stack_trace:
     dependency: transitive
     description:
@@ -199,6 +223,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.4"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: f9049c039ebfeb4cf7a7104a675823cd72dba8297f264b6637062516699fa006
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.0"
+  uuid:
+    dependency: transitive
+    description:
+      name: uuid
+      sha256: a5be9ef6618a7ac1e964353ef476418026db906c4facdedaa299b7a2e71690ff
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.5.1"
   vector_math:
     dependency: transitive
     description: