| UF_UNDO_mark_id_t | mark_id | Input（输入） | mark_id - in the case of: UF_UNDO_misc_cb_set_pre The mark_id is not used UF_UNDO_misc_cb_set_post The mark_id of the mark just set UF_UNDO_misc_cb_undo_pre The mark_id of the mark we are about to undo to; UF_UNDO_misc_cb_undo_post The mark_id of the mark we just undid to. UF_UNDO_misc_cb_chg_vis The mark_id whose visibility just changed |
| void * | closure | Input（输入） | The closure argument passed in when this function was registered. |