opt live border indicator

Signed-off-by: dom <githubaccount56556@proton.me>

lib/pages/live_room/view.dart

@@ -901,30 +901,18 @@ class _LiveRoomPageState extends State<LiveRoomPage>
     if (_liveRoomController.showSuperChat) {
       return Stack(
         children: [
+          child,
           Positioned(
             left: 0,
             top: 0,
             right: 0,
-            child: Obx(() {
-              return ClipRect(
-                clipper: _BorderClipper(
-                  _liveRoomController.pageIndex.value == 0,
-                ),
-                child: const DecoratedBox(
-                  decoration: BoxDecoration(
-                    borderRadius: BorderRadius.vertical(
-                      top: Radius.circular(20),
-                    ),
-                    border: Border(
-                      top: BorderSide(color: Colors.white38),
-                    ),
-                  ),
-                  child: SizedBox(width: double.infinity, height: 20),
-                ),
-              );
-            }),
+            child: Obx(
+              () => _BorderIndicator(
+                radius: const Radius.circular(20),
+                isLeft: _liveRoomController.pageIndex.value == 0,
+              ),
+            ),
           ),
-          child,
         ],
       );
     }
@@ -957,27 +945,87 @@ class _LiveRoomPageState extends State<LiveRoomPage>
       });
 }
 
-class _BorderClipper extends CustomClipper<Rect> {
-  _BorderClipper(this.isLeft);
+class _BorderIndicator extends LeafRenderObjectWidget {
+  const _BorderIndicator({
+    required this.radius,
+    required this.isLeft,
+  });
 
+  final Radius radius;
   final bool isLeft;
 
   @override
-  Rect getClip(Size size) {
-    return Rect.fromLTRB(
-      isLeft ? 0 : size.width / 2,
-      0,
-      isLeft ? size.width / 2 : size.width,
-      size.height,
+  RenderObject createRenderObject(BuildContext context) {
+    return RenderBorderIndicator(
+      radius: radius,
+      isLeft: isLeft,
     );
   }
 
   @override
-  bool shouldReclip(_BorderClipper oldClipper) {
-    return isLeft != oldClipper.isLeft;
+  void updateRenderObject(
+    BuildContext context,
+    RenderBorderIndicator renderObject,
+  ) {
+    renderObject
+      ..radius = radius
+      ..isLeft = isLeft;
   }
 }
 
+class RenderBorderIndicator extends RenderBox {
+  RenderBorderIndicator({
+    required Radius radius,
+    required bool isLeft,
+  }) : _radius = radius,
+       _isLeft = isLeft;
+
+  Radius _radius;
+  Radius get radius => _radius;
+  set radius(Radius value) {
+    if (_radius == value) return;
+    _radius = value;
+    markNeedsLayout();
+  }
+
+  bool _isLeft;
+  bool get isLeft => _isLeft;
+  set isLeft(bool value) {
+    if (_isLeft == value) return;
+    _isLeft = value;
+    markNeedsPaint();
+  }
+
+  @override
+  void performLayout() {
+    size = constraints.constrain(Size(constraints.maxWidth, _radius.x));
+  }
+
+  @override
+  void paint(PaintingContext context, Offset offset) {
+    final size = this.size;
+    final canvas = context.canvas;
+    final width = size.width / 2;
+    if (!_isLeft) {
+      canvas.translate(width, 0);
+    }
+    BoxBorder.paintNonUniformBorder(
+      canvas,
+      Rect.fromLTWH(0, 0, width, size.height),
+      borderRadius: BorderRadius.only(
+        topLeft: _isLeft ? _radius : .zero,
+        topRight: _isLeft ? .zero : _radius,
+      ),
+      textDirection: null,
+      top: const BorderSide(),
+      color: Colors.white38,
+    );
+  }
+
+  @override
+  bool get isRepaintBoundary => true;
+}
+
 class LiveDanmaku extends StatefulWidget {
   final LiveRoomController liveRoomController;
   final PlPlayerController plPlayerController;