struct Background *bg; // for ITEM_NEW_BG_ONE/RESIZE, ITEM_NEW_DEFAULT_BG
int val; // for ITEM_NEW_PAGE, ITEM_NEW_LAYER, ITEM_DELETE_LAYER, ITEM_DELETE_PAGE
double val_x, val_y; // for ITEM_MOVESEL, ITEM_NEW_BG_RESIZE, ITEM_PAPER_RESIZE, ITEM_NEW_DEFAULT_BG
struct Background *bg; // for ITEM_NEW_BG_ONE/RESIZE, ITEM_NEW_DEFAULT_BG
int val; // for ITEM_NEW_PAGE, ITEM_NEW_LAYER, ITEM_DELETE_LAYER, ITEM_DELETE_PAGE
double val_x, val_y; // for ITEM_MOVESEL, ITEM_NEW_BG_RESIZE, ITEM_PAPER_RESIZE, ITEM_NEW_DEFAULT_BG