From 8f0ac0a788d5baf46388ed3a2b0f5e2aba5d21e4 Mon Sep 17 00:00:00 2001
From: Sahil-Simform <122270155+Sahil-Simform@users.noreply.github.com>
Date: Tue, 3 Dec 2024 10:25:43 +0530
Subject: [PATCH] =?UTF-8?q?fix:=20=F0=9F=90=9BFixed=20null=20check=20issue?=
 =?UTF-8?q?=20in=20'RenderBox'=20at'`layout=5Foverlay.dart`(#464)=20(#487)?=
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---
 lib/src/layout_overlays.dart | 42 +++++++++++++++++++++---------------
 lib/src/showcase_widget.dart |  2 +-
 2 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/lib/src/layout_overlays.dart b/lib/src/layout_overlays.dart
index d8516b70..130912af 100644
--- a/lib/src/layout_overlays.dart
+++ b/lib/src/layout_overlays.dart
@@ -65,22 +65,26 @@ class AnchoredOverlay extends StatelessWidget {
           overlayBuilder: (overlayContext) {
             // To calculate the "anchor" point we grab the render box of
             // our parent Container and then we find the center of that box.
-            final box = context.findRenderObject() as RenderBox;
-
-            final topLeft = box.size.topLeft(
-              box.localToGlobal(
-                const Offset(0.0, 0.0),
-                ancestor: rootRenderObject,
-              ),
-            );
-            final bottomRight = box.size.bottomRight(
-              box.localToGlobal(
-                const Offset(0.0, 0.0),
-                ancestor: rootRenderObject,
-              ),
-            );
-            Rect anchorBounds;
-            anchorBounds = (topLeft.dx.isNaN ||
+            final box = context.findRenderObject() as RenderBox?;
+
+            /// Handle null RenderBox safely.
+            final topLeft = box?.size.topLeft(
+                  box.localToGlobal(
+                    Offset.zero,
+                    ancestor: rootRenderObject,
+                  ),
+                ) ??
+                Offset.zero;
+            final bottomRight = box?.size.bottomRight(
+                  box.localToGlobal(
+                    Offset.zero,
+                    ancestor: rootRenderObject,
+                  ),
+                ) ??
+                Offset.zero;
+
+            /// Provide a default anchorBounds if box is null.
+            final anchorBounds = (topLeft.dx.isNaN ||
                     topLeft.dy.isNaN ||
                     bottomRight.dx.isNaN ||
                     bottomRight.dy.isNaN)
@@ -91,7 +95,11 @@ class AnchoredOverlay extends StatelessWidget {
                     bottomRight.dx,
                     bottomRight.dy,
                   );
-            final anchorCenter = box.size.center(topLeft);
+
+            /// Calculate the anchor center or default to Offset.zero.
+            final anchorCenter = box?.size.center(topLeft) ?? Offset.zero;
+
+            /// Pass the anchor details to the overlay builder.
             return overlayBuilder!(overlayContext, anchorBounds, anchorCenter);
           },
           child: child,
diff --git a/lib/src/showcase_widget.dart b/lib/src/showcase_widget.dart
index ad9f91ab..cef0730a 100644
--- a/lib/src/showcase_widget.dart
+++ b/lib/src/showcase_widget.dart
@@ -158,7 +158,7 @@ class ShowCaseWidgetState extends State<ShowCaseWidget> {
   int? activeWidgetId;
   RenderBox? rootRenderObject;
   Size? rootWidgetSize;
-  final Key anchoredOverlayKey = UniqueKey();
+  final anchoredOverlayKey = UniqueKey();
 
   late final TooltipActionConfig? globalTooltipActionConfig;