GdkTimeCoord* gdk_event_get_history ( GdkEvent* event, guint* out_n_coords )
Retrieves the history of the device that
event is for, as a list of
time and coordinates.
The history includes positions that are not delivered as separate events
to the application because they occurred in the same frame as
Note that only motion and scroll events record history, and motion events do it only if one of the mouse buttons is down, or the device has a tool.
Return location for the length of the returned array.
The argument will be set by the function.