feat:增加博客分类模块

lib/widget/easy_refresh.dart

@@ -0,0 +1,65 @@
+import 'package:easy_refresh/easy_refresh.dart';
+import 'package:flutter/material.dart';
+
+Widget buildEasyRefresh({
+  required EasyRefreshController freshController,
+  required Future<void> Function()? onRefresh,
+  required Future<void> Function()? onLoad,
+  required Widget body,
+}) {
+  return EasyRefresh(
+    controller: freshController,
+    header: ClassicHeader(
+      dragText: '下拉刷新',
+      armedText: '释放刷新',
+      readyText: '准备刷新',
+      processingText: '刷新中...',
+      processedText: '刷新完成',
+      failedText: '刷新失败',
+      noMoreText: '没有更多数据',
+      showText: true,
+      messageText: '更新于 %T',
+      showMessage: true,
+    ),
+    footer: ClassicFooter(
+      dragText: '上拉加载',
+      armedText: '释放加载',
+      readyText: '准备加载',
+      processingText: '加载中...',
+      processedText: '加载完成',
+      failedText: '加载失败',
+      noMoreText: '没有更多数据',
+      showText: true,
+      messageText: '更新于 %T',
+      showMessage: true,
+    ),
+    onRefresh: onRefresh,
+    onLoad: onLoad,
+    child: body,
+  );
+}
+
+Widget buildScrollToTop({
+  required BuildContext context,
+  required VoidCallback scrollToTop,
+}) {
+  return Positioned(
+    right: 0,
+    bottom: 20,
+    child: FloatingActionButton(
+      onPressed: scrollToTop,
+      backgroundColor: Theme.of(context).colorScheme.primary,
+      elevation: 2,
+      mini: true,
+      child: const Icon(Icons.arrow_upward, color: Colors.white),
+    ),
+  );
+}
+
+void scrollToTopAnimateTo(ScrollController controller) {
+  controller.animateTo(
+    0,
+    duration: const Duration(milliseconds: 500), // 滚动动画时长
+    curve: Curves.easeInOut, // 滚动动画曲线
+  );
+}