If sequence is currently being interpreted by this, returns
true and fills in x and y with the last coordinates stored for that event sequence.
The coordinates are always relative to the widget allocation.
| this |
a `GtkGesture` |
| sequence |
a `GdkEventSequence`, or null for pointer events |
| x |
return location for X axis of the sequence coordinates |
| y |
return location for Y axis of the sequence coordinates |
|
true if |