TouchEvent(
TouchList touches,
TouchList targetTouches,
TouchList changedTouches,
String type,
{Window view,
int screenX: 0,
int screenY: 0,
int clientX: 0,
int clientY: 0,
bool ctrlKey: false,
bool altKey: false,
bool shiftKey: false,
bool metaKey: false}
)

Not documented.