[webkit-dev] Getting text alignment in editing mode?
darin at apple.com
Fri Jan 23 10:44:10 PST 2009
On Jan 23, 2009, at 10:36 AM, Kevin Ollivier wrote:
> Thanks, do you have any examples of how e.g. the logic in
> selectionHasStyle could be tripped up by (or be insufficient for)
> block styles like this? Is it a matter of having it not query the
> alignment for non-block elements when traversing nodes (because it
> might return an invalid value?), or something else?
I'm not sure if there are any real problems. It's not an area I've
One thing worth considering is that the style might be set on elements
where it has no effect. For example, you could have the style set on a
span within a block, and it wouldn't do anything.
<p style="align: left">a <span style="align: right">b</span> c</p>
Someone might argue that an Align Left menu item should be checked
here, not "half-checked".
As with all editing and style, styles that are applied by CSS style
sheet rules might create tricky cases.
Your question about skipping non-block elements when traversing nodes
is more of a question about how to implement. We'd want to be careful
about doing something like that, because CSS can change an element
that's normally not a block into a block. I am not sure any of these
cases are important. It also seems to me that for block styles we
could be more efficient if we didn't ask every single element what its
computed style is. But it seems smart to start simply.
If I was working on this, I'd start by making an implementation that
uses stateStyle and then try to construct interesting test cases to
see if there are problems in practice.
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