背景

组件手势检测，单击、双击、长按、松开、移动、横向拖动、竖向拖动等事件

属性	作用
onTap	单击
onDoubleTap	双击
onLongPress	长按
onPanUpdate	拖动实时更新
onHorizontalDragDown	横向点击
onVerticalDragDown	竖向点击

 GestureDetector(onTap: () => setState(() => _info = 'onTap'),onDoubleTap: () => setState(() => _info = 'onDoubleTap'),onLongPress: () => setState(() => _info = 'onLongPress'),onHorizontalDragDown: (detail) => setState(() {detail.globalPosition;detail.localPosition;}),child: Container(alignment: Alignment.center,width: 300,height: 300 * 0.4,color: Colors.grey.withAlpha(33),child: Text(_info,style: const TextStyle(fontSize: 18, color: Colors.blue),),),)