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List:       kfm-devel
Subject:    CSS Media="print" support problems
From:       Martijn Klingens <mklingens () ism ! nl>
Date:       2001-09-21 10:12:40
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For the project that I'm working on it would be very nice if KHTML could 
distinguish between media="print" and media="screen" for CSS.

But while digging through the code I am not exactly sure where I should look.

(The following talks about KDE 2.2 branch - I hope this also applies to HEAD. 
Actually, I'd like to know the current differences between 2.2 and HEAD 
regarding KHTML's infrastructure. I only this morning finally decided to 
subscribe to kde-cvs ;-)

Anway, here goes:

I found that in html/html_headimpl.cpp the HTMLLinkElementImpl::attach() 
method already looks for the media type... and then does nothing special with 
it.
Obviously the media type should be stored somewhere so it can later be 
queried by CSSStyleSelector::styleForElement (at least, I think this is the 
method that actually applies the CSS, but hey, I'm new to KHTML...).

For the Link element's implementation it would be enough to store the media 
type in the CachedCSSStyleSheet class or something similar. But that doesn't 
work for the @media element that is allowed inside CSS data. So I'd rather go 
for a more generic approach that can be extended in that direction.

The most important question that I have now is basically a "where can I put 
these changes so that they actually work?".

Also, are there some generic pointers to the classes that I should 
particularly look at? KHTML doesn't seem too difficult to me, but it consists 
of an awful lot of classes, so it is still quite a complex beast to grab at 
first. Each single class is remarkably simple, but the overall picture could 
IMO seriously use a class tree or even UML chart that shows how all classes 
relate to eachother...

Finally, I need this for my work, and for now this project is not planned to 
be developed against CVS HEAD. In other words: I am not using HEAD either. 
This will obviously sooner or later result in problems. But I vaguely 
remember reading that KHTML from HEAD still compiles against 2.2 branch. Is 
that true? How can I setup such a thing? Just cvs up -A in khtml, or is there 
more to it? If this doesn't work, any other clues on how to make it possible 
to forward-port the code (if I get it working ;-) to HEAD with the minimum 
amount of fuss?

Lots of questions here, I almost feel like the newbie I was 10 months ago...

Thanks in advance for any hints and other help,

Martijn

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