在Flutter Web中，我显示一个带有两个操作的弹出窗口“取消”&“确认”。通常，按物理键盘上的ESC键将弹出窗口从框中删除。我想通过按物理键盘上的ENTER键执行确认功能。
我采用了RawKeyboard方法，但似乎不起作用。下面是我的尝试。

showDialog(
      context: context,
      builder: (context) {
        return RawKeyboardListener(
          focusNode: FocusNode(),
          onKey: (RawKeyEvent event){
            print("keyboard key is pressed");
            if(event.isControlPressed){
              print('controlled pressed');
            }
            if (event is RawKeyDownEvent) {
              print('Pressed Key: ${event.logicalKey.debugName}');
            }
            if(event.isKeyPressed(LogicalKeyboardKey.enter)){
              print("Enter is pressed");
            }
          },
          child: DialogSimple(
            title: "Delete Category?",
            message:
            "Do you really want to delete this category?. You cannot undo this action.",
            actions: [
              BtnTextAccent(
                text: "Cancel",
                textColor: Colors.white,
                onPressed: () => Navigator.pop(context),
              ),
              BtnTextAccent(
                text: "Delete",
                textColor: AppColors.dangerColor,
                onPressed: () {
                  Navigator.pop(context);
                  cubit.deleteCategory(item.id);
                },
              ),
            ],
          ),
        );
      });

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上面的代码并没有检测到任何按键事件。我是不是漏掉了什么？