feat(library): 收藏与观看历史支持分页

lib/core/widgets/paged_list_footer.dart

@@ -0,0 +1,86 @@
+// Author: fruit.com.cn
+
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+import '../theme/app_colors.dart';
+import '../../l10n/app_localizations.dart';
+
+/// 网络分页列表底部状态：加载、重试、手动加载与无更多。
+class PagedListFooter extends StatelessWidget {
+  const PagedListFooter({
+    super.key,
+    required this.loading,
+    required this.hasMore,
+    required this.hasItems,
+    required this.onRetry,
+    this.errorMessage,
+  });
+
+  final bool loading;
+  final bool hasMore;
+  final bool hasItems;
+  final String? errorMessage;
+  final Future<void> Function() onRetry;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+    if (errorMessage != null) {
+      return Padding(
+        key: const Key('paged-list-error'),
+        padding: const EdgeInsets.symmetric(vertical: 12),
+        child: Column(
+          children: [
+            Text(
+              errorMessage!,
+              style: const TextStyle(color: AppColors.muted, fontSize: 12),
+            ),
+            TextButton(
+              key: const Key('paged-list-retry'),
+              onPressed: () => unawaited(onRetry()),
+              child: Text(l10n.retry),
+            ),
+          ],
+        ),
+      );
+    }
+    if (loading) {
+      return const SizedBox(
+        key: Key('paged-list-loading'),
+        height: 56,
+        child: Center(
+          child: SizedBox.square(
+            dimension: 20,
+            child: CircularProgressIndicator(
+              strokeWidth: 2,
+              color: AppColors.blue,
+            ),
+          ),
+        ),
+      );
+    }
+    if (hasMore) {
+      return Center(
+        child: TextButton(
+          key: const Key('paged-list-load-more'),
+          onPressed: () => unawaited(onRetry()),
+          child: Text(l10n.loadMore),
+        ),
+      );
+    }
+    if (hasItems) {
+      return Padding(
+        key: const Key('paged-list-no-more'),
+        padding: const EdgeInsets.symmetric(vertical: 14),
+        child: Text(
+          l10n.noMore,
+          textAlign: TextAlign.center,
+          style: const TextStyle(color: AppColors.muted, fontSize: 12),
+        ),
+      );
+    }
+    return const SizedBox(height: 16);
+  }
+}