pro IDLitLayout__define

    compile_opt idl2, hidden

    struct = {IDLitLayout, $
        inherits IDLitComponent, $
        _columns: 0L, $   ; number of columns
        _rows: 0L, $      ; number of rows
        _gridded: 0b, $   ; true if gridded or not
        _lockgrid: 0b $   ; true if grid cannot be changed
        }

end