feat: bugfix

lib/app/widgets/hi_fixed_scrollbar.dart

@@ -9,12 +9,16 @@ class HiFixedScrollbar extends StatefulWidget {
 
   /// 距离右边的间距（默认 18）
   final double right;
+
   /// 滚动条宽度
   final double thickness;
+
   /// 滚动条颜色（默认白色 30%）
   final Color thumbColor;
+
   /// 背景轨道颜色（默认白色 15%）
   final Color trackColor;
+
   /// 滚动条固定高度（默认 50）
   final double thumbHeight;
 
@@ -36,6 +40,7 @@ class HiFixedScrollbar extends StatefulWidget {
 
 class _HiFixedScrollbarState extends State<HiFixedScrollbar> {
   double _thumbOffset = 0.0;
+  bool _hasScrolled = false;
 
   @override
   void initState() {
@@ -58,6 +63,7 @@ class _HiFixedScrollbarState extends State<HiFixedScrollbar> {
 
     setState(() {
       _thumbOffset = (trackHeight * scrollRatio).clamp(0, trackHeight);
+      _hasScrolled = offset > 0;
     });
   }
 
@@ -71,41 +77,44 @@ class _HiFixedScrollbarState extends State<HiFixedScrollbar> {
   Widget build(BuildContext context) {
     return LayoutBuilder(
       builder: (_, constraints) {
+        final showScrollbar = widget.isShowScrollbar &&
+            widget.controller.hasClients &&
+            widget.controller.position.maxScrollExtent > 0 &&
+            _hasScrolled;
         return Stack(
           children: [
             // 滚动内容
             widget.child,
 
-            if(widget.isShowScrollbar)
-              ...[
-                // 滚动条轨道
-                Positioned(
-                  right: widget.right.w,
-                  top: 0,
-                  bottom: 0,
-                  child: Container(
-                    width: widget.thickness.w,
-                    decoration: BoxDecoration(
-                      color: widget.trackColor,
-                      borderRadius: BorderRadius.circular(4),
-                    ),
+            if (showScrollbar) ...[
+              // 滚动条轨道
+              Positioned(
+                right: widget.right.w,
+                top: 0,
+                bottom: 0,
+                child: Container(
+                  width: widget.thickness.w,
+                  decoration: BoxDecoration(
+                    color: widget.trackColor,
+                    borderRadius: BorderRadius.circular(4),
                   ),
                 ),
+              ),
 
-                // 滚动条拇指
-                Positioned(
-                  right: widget.right.w,
-                  top: _thumbOffset,
-                  child: Container(
-                    width: widget.thickness.w,
-                    height: widget.thumbHeight,
-                    decoration: BoxDecoration(
-                      color: widget.thumbColor,
-                      borderRadius: BorderRadius.circular(4),
-                    ),
+              // 滚动条拇指
+              Positioned(
+                right: widget.right.w,
+                top: _thumbOffset,
+                child: Container(
+                  width: widget.thickness.w,
+                  height: widget.thumbHeight,
+                  decoration: BoxDecoration(
+                    color: widget.thumbColor,
+                    borderRadius: BorderRadius.circular(4),
                   ),
                 ),
-              ]
+              ),
+            ]
           ],
         );
       },