onLongPressDown property Null safety

GestureLongPressDownCallback? onLongPressDown

The pointer has contacted the screen with a primary button, which might be the start of a long-press.

This triggers after the pointer down event.

If the user completes the long-press, and this gesture wins, onLongPressStart will be called after this callback. Otherwise, onLongPressCancel will be called after this callback.

See also:


final GestureLongPressDownCallback? onLongPressDown;