add func to check if child with id exists already

CHANGELOG.md

@@ -13,3 +13,7 @@
 ## 1.0.3
 
 -   Update example
+
+## 1.0.4
+
+-   Add `hasChild` method to controller

lib/core/controller/controller.dart

@@ -241,6 +241,11 @@ class LazyCanvasController with ChangeNotifier {
     markDirty();
   }
 
+  /// Returns true if the child exists, false otherwise.
+  bool hasChild(CanvasChildId id) {
+    return _children.containsKey(id);
+  }
+
   // ==================== Positioning Logic ====================
 
   /// Currently rendered widgets with their position info

pubspec.yaml

@@ -1,6 +1,6 @@
 name: infinite_lazy_grid
 description: "infinitely scrollable and zoomable grid layout with lazy loading capabilities."
-version: 1.0.3
+version: 1.0.4
 homepage: https://github.com/ruinivist/infinite_lazy_grid
 
 environment: