torrent list

ui/lib/components/sliver_header.dart

@@ -0,0 +1,91 @@
+import 'package:flutter/material.dart';
+
+class HideableHeaderSliver extends StatelessWidget {
+  final Widget? leading;
+  final Widget body;
+  final double height;
+  final List<Widget>? actions;
+
+  const HideableHeaderSliver({
+    super.key,
+    this.leading,
+    required this.body,
+    this.actions,
+    this.height = 150,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return SliverPersistentHeader(
+      floating: true,
+      pinned: false,
+      delegate: _HideableHeaderSliverDelegate(
+        leading: leading,
+        body: body,
+        actions: actions,
+        height: height,
+      ),
+    );
+  }
+}
+
+class _HideableHeaderSliverDelegate extends SliverPersistentHeaderDelegate {
+  final Widget? leading;
+  final Widget body;
+  final List<Widget>? actions;
+  final double height;
+
+  const _HideableHeaderSliverDelegate({
+    required this.leading,
+    required this.body,
+    required this.actions,
+    required this.height,
+  });
+
+  @override
+  double get maxExtent => height;
+
+  @override
+  double get minExtent => height;
+
+  @override
+  bool shouldRebuild(covariant SliverPersistentHeaderDelegate oldDelegate) => true;
+
+  @override
+  Widget build(BuildContext context, double shrinkOffset, bool overlapsContent) {
+    final content = <Widget>[
+      if (leading != null) leading!,
+      Expanded(child: body),
+      if (actions != null && actions!.isNotEmpty) ButtonBar(children: actions!),
+    ];
+
+    final appBarTheme = AppBarTheme.of(context);
+    final colorScheme = Theme.of(context).colorScheme;
+    final onTop = (shrinkOffset == 0);
+
+    return Material(
+      color:
+          onTop ? appBarTheme.backgroundColor ?? colorScheme.surface : colorScheme.surfaceContainer,
+      elevation: onTop ? 0 : appBarTheme.elevation ?? 3,
+      surfaceTintColor: appBarTheme.surfaceTintColor ?? colorScheme.surfaceTint,
+      child: ClipRect(
+        child: SizedBox(
+          height: maxExtent,
+          child: Column(
+            children: [
+              const Spacer(),
+              Row(
+                children: content,
+              ),
+              const Spacer(),
+              const Divider(
+                height: 1,
+                thickness: 1,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}