mdLongClick method
Note - For single prop use onInkLongPress.
Extension method to directly access material _VelocityXInkWellBuilder
long click with any widget without wrapping or with dot operator.
Implementation
_VelocityXInkWellBuilder mdLongClick(FnBuilderCallback onClick) =>
_VelocityXInkWellBuilder.mdLongClick(this, onClick);