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Re: [cssom-view] addMediumListener / removeMediumListener

From: Luiz Agostini <luiz.agostini@openbossa.org>
Date: Tue, 25 May 2010 13:05:39 -0300
Message-ID: <AANLkTinx6J-WJ0KVjACGQCGfNkHpRGCvwPyrv3HoEZ35@mail.gmail.com>
To: Anne van Kesteren <annevk@opera.com>
Cc: www-style@w3.org, marcosc@opera.com
Hi,

I have some questions:

1 - The text refers to media query. Is it a media_query or a
media_query_list as defined in
http://www.w3.org/TR/css3-mediaqueries/#syntax? I assume it is about a
media_query_list. The serialization rules for a list of media queries do not
mention any sorting of the queries in the list and thus is not good for
comparison because it would then lead to "(color) and (min-width: 100px)" !=
(min-width: 100px) and (color)" for example. Should serialization rules for
a list of media queries change?

2 - Is mediaText really needed as parameter of MediaQueryCallbacks? Being a
serialization of the media query it may be different of the original query
and user would not have an easy way to recognize it. In other hand it may be
very easy to provide this kind of information to callbacks using Javascript
closures. For example:

function mediumCallback(query, value)
{
    alert(query + " = " + value);
}

function addMediumListener(query)
{
    window.styleMedia.addMediumListener(query, mediumCallback);
}

addMediumListener("tv and (color)");

 Any kind of information may be supplied to the callbacks this way and the
media query, specially the serialized media query,  may not necessarily the
most useful information in all situations.

3 - Is the order in which the callbacks must be called specified?

br,
Luiz

2010/5/25 Anne van Kesteren <annevk@opera.com>

> Taking no answer to my endorsement of the proposal of David Baron as a
> tentative yes I added addMediumListener and removeMediumListener to the
> draft of CSSOM View. It was a little bit more complex than I thought so I'd
> appreciate it if people gave it a good look for errors. They're part of the
> StyleMedia interface.
>
> http://dev.w3.org/csswg/cssom-view/#the-stylemedia-interface
>
> I re-used terminology as much as possible. The only exception is that I
> used the interface prefix MediaQuery rather than Media (as would be logical
> given MediaList) to prevent potential future clashes with the media elements
> in HTML.
>
>
> --
> Anne van Kesteren
> http://annevankesteren.nl/
>
>
Received on Tuesday, 25 May 2010 16:06:13 GMT

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