opt: code

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/common/widgets/custom_sliver_persistent_header_delegate.dart

@@ -4,12 +4,14 @@ class CustomSliverPersistentHeaderDelegate
     extends SliverPersistentHeaderDelegate {
   CustomSliverPersistentHeaderDelegate({
     required this.child,
+    required this.bgColor,
     double extent = 45,
   })  : _minExtent = extent,
         _maxExtent = extent;
   final double _minExtent;
   final double _maxExtent;
   final Widget child;
+  final Color bgColor;
 
   @override
   Widget build(
@@ -17,7 +19,10 @@ class CustomSliverPersistentHeaderDelegate
     //创建child子组件
     //shrinkOffset：child偏移值minExtent~maxExtent
     //overlapsContent：SliverPersistentHeader覆盖其他子组件返回true，否则返回false
-    return child;
+    return ColoredBox(
+      color: bgColor,
+      child: child,
+    );
   }
 
   //SliverPersistentHeader最大高度
@@ -31,6 +36,6 @@ class CustomSliverPersistentHeaderDelegate
   @override
   bool shouldRebuild(
       covariant CustomSliverPersistentHeaderDelegate oldDelegate) {
-    return true;
+    return oldDelegate.bgColor != bgColor;
   }
 }