onLongPressStart property

Called when a long press gesture by a primary button has been recognized.

This is equivalent to (and is called immediately before) onLongPress. The only difference between the two is that this callback contains details of the position at which the pointer initially contacted the screen, whereas onLongPress does not.

See also:

• kPrimaryButton, the button this callback responds to.
• LongPressStartDetails, which is passed as an argument to this callback.