flutter GestureDetector 아래 위 swipe 판별시 사용 primaryVelocity

 GestureDetector(

  onVerticalDragEnd: (details) {
    setState(() {
      // viewWeek = details.velocity.pixelsPerSecond.dy < 0
      //     ? false
      //     : true;
      print("ssss==="+details.primaryVelocity.toString());
      if (details.primaryVelocity < 0) {
        // 주 단위 보여 주기
        viewWeek = true;
        viewCalender = false;
        titelCalenderYn = false;
      } else {
        viewWeek = false;
        viewCalender = true;
        titelCalenderYn = true;
      }
    });
  },
  child: Column(
    children: [
      Visibility(
        visible: viewCalender,
        child: Container(
          height: calSize,
          margin: EdgeInsets.fromLTRB(16, 0, 16, 0),
          padding: EdgeInsets.fromLTRB(0, 0, 0, 0),
          // 6열인 경우 504 5열인경우 420
          alignment: Alignment.center,
          child: _salesCalenderList(salesDetailListCalender),
        ),
      ),
      Visibility(
        visible: viewWeek,
        child: Container(
          height: 100,
          margin: EdgeInsets.fromLTRB(16, 0, 16, 0),
          padding: EdgeInsets.fromLTRB(0, 0, 0, 0),
          // 6열인 경우 504 5열인경우 420
          alignment: Alignment.center,
          child: _salesWeekList(salesDetailListCalender),
        ),
      ),
    ],
  ),
),