Flutter- GestureDetector检测水平和垂直拖动的方向 [英] Flutter- GestureDetector detect the direction of Horizontal and Vertical Drag

问题描述

我正在使用GestureDetector，但是没有找到任何告诉您拖动方向的onXYZ事件.

I am using GestureDetector and didn't find any onXYZ event which tells you the direction of drag.

推荐答案

您尝试过onPanUpdate(details)方法吗?这是您的操作方法.

Did you try onPanUpdate(details) method? Here is how you can do it.

GestureDetector(onPanUpdate: (details) {
  if (details.delta.dx > 0)
    print("Dragging in +X direction");
  else
    print("Dragging in -X direction");

  if (details.delta.dy > 0)
    print("Dragging in +Y direction");
  else
    print("Dragging in -Y direction");
});

注意:如果按anmol.majhail所述设置onHorizontalDragUpdate()或onVerticalDragUpdate()，则此回调会导致崩溃.

Note: This callback causes a crash if onHorizontalDragUpdate() or onVerticalDragUpdate() is set as mentioned by anmol.majhail.

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