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 并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

你试过 onPanUpdate(details) 方法了吗?这是你可以做到的.

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");
  },
  child: Container(
    color: Colors.blue,
    width: double.infinity,
    height: double.infinity,
  ),
)

注意:如果 onHorizo​​ntalDragUpdate() 或 onVerticalDragUpdate() 也如 anmol.majhail 所述提供，则此回调会导致崩溃.

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

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