On Sat, Sep 28, 2013 at 10:07 AM, Robert O'Callahan <robert@ocallahan.org>wrote: > -- DOMRect is the base interface for both immutable and mutable rects. It > defines "current x/y/width/height" state and can expose methods that use > that state. Other APIs can take DOMRects and be defined in terms of the > current state. It allows read-only access to the current state and does not > offer any mutation APIs. > -- DOMRectImmutable extends DOMRect and adds the invariant that the state > never changes. It probably doesn't need to add any new API. (However, being > immutable is potentially meaningful to clients, because it allows them to > avoid copying, so testing whether a rect is immutable could have value.) > -- DOMRectMutable extends DOMRect and adds APIs to mutate the rect. > BTW if we take this approach then a "live rect" that's not immutable but can't be changed by the client is exactly DOMRect. Rob -- Jtehsauts tshaei dS,o n" Wohfy Mdaon yhoaus eanuttehrotraiitny eovni le atrhtohu gthot sf oirng iyvoeu rs ihnesa.r"t sS?o Whhei csha iids teoa stiheer :p atroa lsyazye,d 'mYaonu,r "sGients uapr,e tfaokreg iyvoeunr, 'm aotr atnod sgaoy ,h o'mGee.t" uTph eann dt hwea lmka'n? gBoutt uIp waanndt wyeonut thoo mken.o w * *
Received on Friday, 27 September 2013 22:09:03 UTC