A.13.2.4. wl_input_device::pointer_focus - pointer focus change event

Notification that this input device's pointer is focused on certain surface. When an input_device enters a surface, the pointer image is undefined and a client should respond to this event by setting an appropriate pointer image.

wl_input_device::pointer_focus arguments

time: Type: uint
surface: Type: object
surface_x: Type: int
surface_y: Type: int