onLongPress property

GestureLongPressCallback onLongPress

Called when the user presses on the render object for a long period of time.

Implementation 

GestureLongPressCallback get onLongPress => _onLongPress;
void onLongPress= (GestureLongPressCallback value)

Implementation 

set onLongPress(GestureLongPressCallback value) {
  if (_onLongPress == value)
    return;
  final bool hadHandler = _onLongPress != null;
  _onLongPress = value;
  if ((value != null) != hadHandler)
    markNeedsSemanticsUpdate();
}