get_deltas
Description:
Extracts the scroll deltas of a scroll event.
The deltas will be zero unless the scroll direction is gdk_scroll_smooth.
For the representation unit of these deltas, see [method@Gdk.ScrollEvent.get_unit].
Parameters:
| this |
a scroll event |
| delta_x |
return location for x scroll delta |
| delta_y |
return location for y scroll delta |