小编Maj*_*Ali的帖子

我想在 flutter 中更改 PopupMenuButton 的形状，想在顶部添加一个三角形，如下图所示，我在 google 上花了很多时间，但没有取得任何成就，请帮助我，我是 flutter 新手，所以我不这样做知道如何更改此默认容器，现在它只有白色圆形容器，白色箭头/三角形未添加在其顶部。请帮忙，提前致谢

 popUpMenu= PopupMenuButton<String>(
     key: _menuKey,
     offset: Offset(50,100),
     padding: EdgeInsets.all(0.0),
     onSelected: (value) {
       if (value == "Tax & Additional Charges") {
         endDrawerController.drawerKey.value =
             EndDrawerKeys.TaxAndAdditionalChargesEndDrawer;
         endDrawerController.scaffoldKey.currentState.openEndDrawer();
         print("Entering in tax");
       } else if (value == "Hold this Invoice") {
         endDrawerController.drawerKey.value =
             EndDrawerKeys.HoldInvoiceEndDrawer;
         endDrawerController.scaffoldKey.currentState.openEndDrawer();
       }
     },
     shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.all(Radius.circular(10.h))),
     itemBuilder: (context) => [
       PopupMenuItem(
         value: "Tax & Additional Charges",
         child: popUpMenuSingleItem(
             icon: AppAssets.DeliveryIcon,
             text: "Tax & Additional Charges",
             topMargin: 15.h),
       ),
       PopupMenuItem(
         value: "Hold this …