Cursor constructor
Cursor({})
Implementation
Cursor({
this.width = 4.0,
this.height,
this.radius = _kDefaultRadius,
required this.color,
this.fadeDuration = _kDefaultFadeDuration,
this.blinkHalfPeriod = _kDefaultBlinkHalfPeriod,
this.blinkWaitForStart = _kDefaultBlinkWaitForStart,
this.enabled = false,
}) : assert(width >= 0.0),
assert(height == null || height >= 0.0);