void ro_mouse_track_start(void (*poll_end)(wimp_leaving *leaving, void *data),
void (*poll_track)(wimp_pointer *pointer, void *data),
void *data)
{
/* It should never be possible for the mouse to be in two windows
* at the same time! However, some third-party extensions to RISC OS
* appear to make this possible (MouseAxess being one), so in the
* event that there's still a claimant we tidy them up first and then
* log the fact in case there are any unexpected consequences.
*
* NB: The Poll End callback will get called with *leaving == NULL in
* this situation, as there's no PointerLeaving event to pass on.
*/
if (ro_mouse_poll_end_callback != NULL ||
ro_mouse_poll_track_callback != NULL ||
ro_mouse_poll_data != NULL) {
if (ro_mouse_poll_end_callback != NULL &&
ro_mouse_ignore_leaving_event == false)
ro_mouse_poll_end_callback(NULL, ro_mouse_poll_data);
LOG("Unexpected mouse track termination.");
ro_mouse_ignore_leaving_event = false;
ro_mouse_poll_end_callback = NULL;
ro_mouse_poll_track_callback = NULL;
ro_mouse_poll_data = NULL;
}
/* Now record details of the new claimant. */
ro_mouse_poll_end_callback = poll_end;
ro_mouse_poll_track_callback = poll_track;
ro_mouse_poll_data = data;
}
void ro_mouse_pointer_leaving_window(wimp_leaving *leaving)
{
if (ro_mouse_poll_end_callback != NULL &&
ro_mouse_ignore_leaving_event == false)
ro_mouse_poll_end_callback(leaving, ro_mouse_poll_data);
ro_mouse_ignore_leaving_event = false;
/* Poll tracking is a one-shot event, so clear the data ready for
* another claimant.
*/
ro_mouse_poll_end_callback = NULL;
ro_mouse_poll_track_callback = NULL;
ro_mouse_poll_data = NULL;
}
