Returns the accumulated backlog of tracking information.
By default, GTK will limit rate of input events. On stylus input where accuracy of strokes is paramount, this function returns the
accumulated coordinate/timing state before the emission of the current [Gtk.GestureStylus:GtkGestureStylus:motion] signal.
This function may only be called within a [[email protected]:GtkGestureStylus:motion] signal handler, the state given
in this signal and obtainable through [[email protected]_axis] express the latest (most up-to-date) state in motion history.
The backlog is provided in chronological order.
| this |
a `GtkGestureStylus` |
| backlog |
coordinates and times for the backlog events |
| n_elems |
return location for the number of elements |
|
true if there is a backlog to unfold in the current state. |