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style: Implement basic column spans.

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This patch provides some of the groundwork for column spans greater than
1. It implements the column-span CSS property (prefixed so as not to be
exposed to content) as well as the corresponding colspan attribute;
although the former is not well-specified outside of CSS multi-column
layout, INTRINSIC refers to it. Although width is distributed to
spanning columns, they do not yet contribute minimum and preferred
widths; this will be implemented in a follow-up.

Additionally, this patch cleans up some miscellaneous formatting issues
and improves the handling of table rowgroups.
This commit is contained in:
Patrick Walton 2014-12-07 23:01:35 -08:00
parent 14bafb11be
commit 56b78de5bc
13 changed files with 269 additions and 129 deletions
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13
components/script/dom/element.rs
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@ -44,8 +44,9 @@ use dom::node::{window_from_node};
use dom::nodelist::NodeList;
use dom::virtualmethods::{VirtualMethods, vtable_for};
use devtools_traits::AttrInfo;
use style::{mod, BgColorSimpleColorAttribute, BorderUnsignedIntegerAttribute, IntegerAttribute};
use style::{LengthAttribute, SimpleColorAttribute, SizeIntegerAttribute, UnsignedIntegerAttribute};
use style::{mod, BgColorSimpleColorAttribute, BorderUnsignedIntegerAttribute};
use style::{ColSpanUnsignedIntegerAttribute, IntegerAttribute, LengthAttribute};
use style::{SimpleColorAttribute, SizeIntegerAttribute, UnsignedIntegerAttribute};
use style::{WidthLengthAttribute, matches, parse_selector_list_from_str};
use servo_util::namespace;
use servo_util::str::{DOMString, LengthOrPercentageOrAuto, SimpleColor};
@ -349,6 +350,14 @@ impl RawLayoutElementHelpers for Element {
None
}
}
ColSpanUnsignedIntegerAttribute => {
if self.is_htmltablecellelement() {
let this: &HTMLTableCellElement = mem::transmute(self);
this.get_colspan()
} else {
panic!("I'm not a table cell!")
}
}
}
}