[webkit-dev] paged media update?

Milian Wolff milian.wolff at kdab.com
Mon Aug 6 04:09:32 PDT 2012

Hello David,

I wanted to ask whether you are still working on this? Is there a rough 
estimate on when one could start to work on paged media support?


On Wednesday 16 May 2012 14:25:20 David Hyatt wrote:
> The difficulty with implementing paged media right now is that I'm beginning
> work on re-architecting pagination to unify columns, pages and regions. You
> can see the beginnings of this with the new multi-column classes that have
> been added to the tree.
> The basic idea is that multi-column layout is being separated from
> RenderBlock and moved to a subclass, RenderMultiColumnBlock. Similar to how
> regions work, the content is represented by a flow thread and by regions
> that the flow thread is placed into. In order to avoid creating thousands
> of regions for columns, I've introduced the concept of a "region set",
> i.e., RenderMultiColumnSet.
> Pages ultimately need to be rebuilt to work the same way, i.e., to have a
> RenderPageFlowThread and a RenderPageSet. Once we have actual renderers
> that represent these objects, it will be a lot easier to make real boxes
> for things like margins, headers, footers, etc. The idea is that a set
> represents a contiguous run of objects that can all be rendered
> identically. If you're forced to have a different kind of object, e.g., a
> page with a different width/height or different style, then you break up
> the RenderPageSet and have multiple sets for each (this is similar to how
> regions work by default, although I hope to apply the same optimization to
> regions eventually as well if runs of same width/height regions are
> detected that are also siblings in the render tree).
> dave
Milian Wolff | milian.wolff at kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel. Germany +49-30-521325470, Sweden (HQ) +46-563-540090
KDAB - Qt Experts - Platform-independent software solutions
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