def run_in_background(self, *, initiator: object | None = None) -> None:
from aqt import mw
assert mw
mw._increase_background_ops()
def wrapped_op() -> ResultWithChanges:
assert mw
return self._op(mw.col)
def wrapped_done(future: Future) -> None:
assert mw
mw._decrease_background_ops()
# did something go wrong?
if exception := future.exception():
if isinstance(exception, Exception):
if self._failure:
self._failure(exception)
else:
show_exception(parent=self._parent, exception=exception)
return
else:
# BaseException like SystemExit; rethrow it
future.result()
result = future.result()
try:
if self._success:
self._success(result)
finally:
mw.update_undo_actions()
mw.autosave()
# fire change hooks
self._fire_change_hooks_after_op_performed(result, initiator)
def _legacy_undo(*, parent: QWidget) -> None:
from aqt import mw
assert mw
assert mw.col
reviewing = mw.state == "review"
just_refresh_reviewer = False
result = mw.col.undo_legacy()
if result is None:
# should not happen
showInfo("nothing to undo", parent=parent)
mw.update_undo_actions()
return
elif isinstance(result, LegacyReviewUndo):
name = tr.scheduling_review()
if reviewing:
# push the undone card to the top of the queue
cid = result.card.id
card = mw.col.get_card(cid)
mw.reviewer.cardQueue.append(card)
gui_hooks.review_did_undo(cid)
just_refresh_reviewer = True
elif isinstance(result, LegacyCheckpoint):
name = result.name
else:
assert_exhaustive(result)
assert False
if just_refresh_reviewer:
mw.reviewer.nextCard()
else:
# full queue+gui reset required
mw.reset()
tooltip(tr.undo_action_undone(action=name), parent=parent)
gui_hooks.state_did_revert(name)
mw.update_undo_actions()