feat:增加加载中显示

lib/widget/markdown.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/material.dart';
+import 'package:markdown_widget/config/toc.dart';
+import 'package:markdown_widget/widget/markdown.dart';
+
+Widget buildMarkdown({
+  required TocController tocController,
+  required String data,
+}) => MarkdownWidget(data: data, tocController: tocController);
+
+Widget buildTocPanel({
+  required TocController tocController,
+  required bool showToc,
+}) => Visibility(
+  visible: showToc,
+  child: Align(
+    alignment: Alignment.bottomRight,
+    child: Container(
+      width: 250,
+      height: 400,
+      decoration: BoxDecoration(
+        color: Colors.white,
+        borderRadius: BorderRadius.circular(12),
+        boxShadow: [
+          BoxShadow(
+            color: Colors.black.withAlpha(50),
+            blurRadius: 8,
+            offset: const Offset(0, 4),
+          ),
+        ],
+        border: Border.all(color: Colors.grey[300]!),
+      ),
+      child: Column(
+        children: [
+          Container(
+            padding: const EdgeInsets.all(12),
+            decoration: BoxDecoration(
+              color: Colors.grey[100],
+              borderRadius: const BorderRadius.only(
+                topLeft: Radius.circular(12),
+                topRight: Radius.circular(12),
+              ),
+            ),
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                const Text(
+                  '目录',
+                  style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
+                ),
+              ],
+            ),
+          ),
+          Expanded(
+            child: TocWidget(
+              controller: tocController,
+              tocTextStyle: TextStyle(fontSize: 14),
+            ),
+          ),
+        ],
+      ),
+    ),
+  ),
+);