onLongPressDown property Null safety

GestureLongPressDownCallback? onLongPressDown
read / write

Called when a pointer has contacted the screen at a particular location with a primary button, which might be the start of a long-press.

This triggers after the pointer down event.

If this recognizer doesn't win the arena, onLongPressCancel is called next. Otherwise, onLongPressStart is called next.

See also:

Implementation

GestureLongPressDownCallback? onLongPressDown;