fix(flutter): 修复下拉刷新页面跟随

lib/core/widgets/app_pull_to_refresh.dart

@@ -9,6 +9,8 @@ import '../theme/app_colors.dart';
 
 const double _maxPullDistance = 96;
 const double _refreshThreshold = 56;
+const double _indicatorHeight = 64;
+const double _indicatorMaxOffset = 10;
 const Duration _arrowTurnDuration = Duration(milliseconds: 160);
 const Duration _retractDuration = Duration(milliseconds: 200);
 
@@ -23,6 +25,9 @@ class AppPullToRefresh extends StatefulWidget {
     this.edgeOffset = 0,
   });
 
+  static const AlwaysScrollableScrollPhysics physics =
+      AlwaysScrollableScrollPhysics(parent: BouncingScrollPhysics());
+
   final Widget child;
   final Future<void> Function() onRefresh;
   final double edgeOffset;
@@ -40,6 +45,12 @@ class _AppPullToRefreshState extends State<AppPullToRefresh> {
     if (notification.depth != 0 || _refreshing) return false;
     if (notification is ScrollStartNotification) {
       if (notification.dragDetails != null) _setPullDistance(0);
+    } else if (notification is ScrollUpdateNotification) {
+      if (notification.dragDetails != null) {
+        _setPullDistance(
+          notification.metrics.minScrollExtent - notification.metrics.pixels,
+        );
+      }
     } else if (notification is OverscrollNotification) {
       if (notification.dragDetails != null) {
         _setPullDistance(_pullDistance - notification.overscroll);
@@ -100,19 +111,46 @@ class _AppPullToRefreshState extends State<AppPullToRefresh> {
       child: Stack(
         fit: StackFit.expand,
         children: [
-          widget.child,
+          Listener(
+            onPointerUp: (_) => _release(),
+            onPointerCancel: (_) => _release(),
+            child: widget.child,
+          ),
           if (_state != _PullState.idle)
             Positioned(
               top: widget.edgeOffset,
               left: 0,
               right: 0,
-              child: IgnorePointer(child: _indicator(context)),
+              child: IgnorePointer(child: _indicatorLayer(context)),
             ),
         ],
       ),
     );
   }
 
+  Widget _indicatorLayer(BuildContext context) {
+    final progress = (_pullDistance / _refreshThreshold).clamp(0.0, 1.0);
+    final opacity = _state == _PullState.refreshing
+        ? 1.0
+        : progress.clamp(0.0, 1.0);
+    return SizedBox(
+      height: _indicatorHeight,
+      child: Opacity(
+        opacity: opacity,
+        child: Transform.translate(
+          offset: Offset(0, _indicatorMaxOffset * progress),
+          child: Align(
+            alignment: Alignment.topCenter,
+            child: Padding(
+              padding: const EdgeInsets.only(top: 8),
+              child: _indicator(context),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
   Widget _indicator(BuildContext context) {
     final l10n = AppLocalizations.of(context)!;
     if (_state == _PullState.refreshing) {