onLongPress property
The handler for SemanticsAction.longPress.
This is the semantic equivalent of a user pressing and holding the screen with the finger for a few seconds without moving it.
VoiceOver users on iOS and TalkBack users on Android can trigger this action by double-tapping the screen without lifting the finger after the second tap.
Implementation
VoidCallback get onLongPress => _onLongPress;
Implementation
set onLongPress(VoidCallback handler) {
if (_onLongPress == handler)
return;
final bool hadValue = _onLongPress != null;
_onLongPress = handler;
if ((handler != null) != hadValue)
markNeedsSemanticsUpdate();
}