A number uniquely identifying this touch point. It must stay unique to this touch point at least until an up event is sent for the same identifier, or all touch points are cancelled.
The x coordinate of the new touch point.
The y coordinate of the new touch point.
Pressure data of the touch point, from 0.0 to 1.0, or NaN if no data is available.
a bit-mask representing the state of the modifier keys (e.g. Control, Shift and Alt).
a new #GstEvent
Create a new navigation event for an added touch point.