call abstract method

double? call({ required Axis axis, required TextDirection direction, required double length, required double min, required double max, required double childStart, required double childEnd, })

Returns the arrow's center along the edge, or null to hide the arrow.

axis is the edge's axis.

direction is the ambient text direction.

length is the edge's length.

min and max bound the center to keep the arrow off the corners. min may exceed max if the edge is too short.

childStart and childEnd are the child's extent.

Implementation

double? call({
  required Axis axis,
  required TextDirection direction,
  required double length,
  required double min,
  required double max,
  required double childStart,
  required double childEnd,
});