Re: [eclipse-incubator-e4-dev] CSS namespaces

["向雅" <fyaoxy@xxxxxxxxx>]

Since the current CSS shoes not fit our feet, why not consider a fully new CSS?

And SWT has not any legacy burden and weight.


2008/8/9 Kevin McGuire <Kevin_McGuire@xxxxxxxxxx>:
>
>> Hi,
>>
>> Angelo brought up CSS namespaces, I think this is an important topic
>> that hasn't been discussed here yet.
>
> Sigh... yes.
>
>> The question is how to specify
>> custom widget types in CSS. With SWT, the widget names are unambiguous,
>> but custom widgets can involve name collisions.
>>
>> Using CSS namespaces would be an option, although I would then opt for
>> using a default namespace for SWT to avoid clutter. The CSS could look
>> like this:
>>
>>    @namespace "org.eclipse.swt.widgets";
>>    @namespace my "my.name.space";
>>
>>    Label {
>>      color;red;
>>    }
>>
>>    my|Label {
>>      color;red;
>>    }
>>
>> On the other hand, some frequently used SWT widgets live in
>> "org.eclipse.swt.custom" (CLabel, CCombo, CTabFolder, ...), so those
>> would have to be prefixed as well (which I somehow dislike):
>>
>>    swtcustom|CLabel {
>>      color: blue;
>>    }
>
> Agree, I dislike it too. It's annoying to clutter the typical case (SWT
> widgets, regardless of whether they are custom or not).
>
>> Moreover, CSS 3 is not yet widely adopted and the available parsers do
>> not support it out-of-the-box.
>
> Good point.
>
>> An alternative to CSS namespaces could be some kind of mapping between
>> widget classes and CSS element names.
>
> I think this is a reasonable approach. Extended widgets outside of SWT would
> need some form of qualified name, not so much to prevent clashing with SWT
> since presumably everyone avoids that, but to prevent clashing with each
> other.  The element names can be whatever we want them to be, since its our
> code that'll do the mapping from CSS to widget method calls.  So we could
> solve it without resorting to CSS name spaces, for example by requiring that
> extended widgets register their names with us in some qualified fashion
> (e.g. NebulaGallery).  Kinda hacky but would work.
>
> Kevin
>
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-- 
致敬
向雅