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Re: Mutation events replacement

From: Ryosuke Niwa <rniwa@webkit.org>
Date: Wed, 20 Jul 2011 13:18:57 -0700
Message-ID: <CABNRm62jUNdVSTN6jsXM0g084Zot3y7hh5uL+3836dtu1e_k-Q@mail.gmail.com>
To: Boris Zbarsky <bzbarsky@mit.edu>
Cc: public-webapps@w3.org
On Tue, Jul 19, 2011 at 8:23 PM, Boris Zbarsky <bzbarsky@mit.edu> wrote:

> On 7/19/11 7:18 PM,
> Ryosuke Niwa
> Software Engineer
> Google Inc.
> wrote:
>> For editing purposes, it's also crucial to know from/to where nodes are
>> removed/inserted.  It seems like adding an offset trivially solves this
>> problem without much overhead.
> I'm not convinced about "without much overhead".  In general, adding an
> offset is O(N) in number of childnodes in many existing implementations....
>  that can be improved, but only at the cost of more memory or performance
> elsewhere.

That's a good point.  It should probably before/after node instead.

 Again, it'll be very useful to have old and new values for editing
>> purposes.  Although I have a reservation as to whether we should do for
>> style or not because calling mutation listeners every time script
>> modifies some style property will be quite expensive as it requires
>> serializing CSSStyleDeclaration.
> Yes, that is _exactly_ the problem.

Right so it should be an opt-in feature as you suggested.

- Ryosuke
Received on Wednesday, 20 July 2011 20:19:55 UTC

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