一.您需要做的是将整个屏幕（或某个区域）包裹在GestureDetector小部件中并监听事件，如下所示：

1.onTapDown或onTapUp

GestureDetector(

      onTapDown: (details){

        final tapPosition = details.globalPosition;        final x = tapPosition.dx;        final y = tapPosition.dy;        // do something with x & y

      },

      child: Scaffold(/* ...*/)

)

2.onLongPressStart

GestureDetector(

    onLongPressStart: (olpdt) async {

    var menuResult = await showRightMenu(context,

    olpdt.globalPosition.dx,

    olpdt.globalPosition.dy,

    items: [ MapEntry("修改", eventMenuItems.edit),

            MapEntry("删除", eventMenuItems.delete)]);