onLongPress property Null safety
Called when the user presses on the render object for a long period of time.
Implementation
GestureLongPressCallback? get onLongPress => _onLongPress;
Implementation
set onLongPress(GestureLongPressCallback? value) {
if (_onLongPress == value)
return;
final bool hadHandler = _onLongPress != null;
_onLongPress = value;
if ((value != null) != hadHandler)
markNeedsSemanticsUpdate();
}