初始化

2026-09-15 15:44:13 +07:00
commit a23ba685e9
1065 changed files with 101122 additions and 0 deletions
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+import 'dart:math';
+
+import 'package:flutter/widgets.dart';
+
+class MySliverDelegate extends SliverPersistentHeaderDelegate {
+  final double? maxHeight;
+  final double? minHeight;
+  final Widget? child;
+  final bool? forceRefresh; //是否需要强制刷新
+  // double? shrinkOffset;
+  final Widget Function(
+    BuildContext context,
+    double shrinkOffset,
+    bool overlapsContent,
+    Widget? child,
+  )? childBuildHandler;
+  Function(double)? callTop;
+
+  MySliverDelegate({
+    required this.maxHeight,
+    required this.minHeight,
+    this.child,
+    this.childBuildHandler,
+    this.forceRefresh = false,
+    this.callTop,
+  });
+
+  @override
+  Widget build(BuildContext context, double shrinkOffset, bool overlapsContent) {
+    if (callTop != null) callTop!(shrinkOffset);
+    if (childBuildHandler == null) {
+      return SizedBox.expand(
+        child: child,
+      );
+    }
+    return childBuildHandler!(context, shrinkOffset, overlapsContent, child);
+  }
+
+  @override
+  double get maxExtent => max(maxHeight!, minHeight!);
+
+  @override
+  double get minExtent => minHeight!;
+
+  @override
+  bool shouldRebuild(covariant SliverPersistentHeaderDelegate oldDelegate) {
+    return (forceRefresh ?? false) ? true : maxHeight != oldDelegate.maxExtent || minHeight != oldDelegate.minExtent;
+  }
+}