onTapDown method
Implementation
@override
void onTapDown(TapDownDetails details) {
widget.controller.stopDeceleration();
_curX = details.localPosition.dx;
_curY = details.localPosition.dy;
_closestDataSetToTouch = widget.controller.painter?.getDataSetByTouchPoint(
details.localPosition.dx, details.localPosition.dy);
if (widget.controller.touchEventListener != null) {
var point = _getTouchValue(
widget.controller.touchEventListener!.valueType(),
details.globalPosition.dx,
details.globalPosition.dy,
details.localPosition.dx,
details.localPosition.dy);
widget.controller.touchEventListener?.onTapDown(point.x, point.y);
}
}