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style: Add Gecko-only support for writing-mode:sideways-{lr,rl}.

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Fixes #15213.
This commit is contained in:
Cameron McCormack 2017-04-15 20:10:24 +10:00
parent 10f2d3c38e
commit b73916a135
3 changed files with 36 additions and 11 deletions
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13
components/style/logical_geometry.rs
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@ -29,8 +29,12 @@ bitflags!(
const FLAG_RTL = 1 << 0,
const FLAG_VERTICAL = 1 << 1,
const FLAG_VERTICAL_LR = 1 << 2,
const FLAG_SIDEWAYS = 1 << 3,
const FLAG_UPRIGHT = 1 << 4,
/// For vertical writing modes only. When set, line-over/line-under
/// sides are inverted from block-start/block-end. This flag is
/// set when sideways-lr is used.
const FLAG_LINE_INVERTED = 1 << 3,
const FLAG_SIDEWAYS = 1 << 4,
const FLAG_UPRIGHT = 1 << 5,
}
);
@ -50,7 +54,7 @@ impl WritingMode {
#[inline]
pub fn is_inline_tb(&self) -> bool {
// https://drafts.csswg.org/css-writing-modes-3/#logical-to-physical
!self.intersects(FLAG_RTL)
self.intersects(FLAG_RTL) == self.intersects(FLAG_LINE_INVERTED)
}
#[inline]
@ -145,6 +149,9 @@ impl fmt::Display for WritingMode {
if self.intersects(FLAG_SIDEWAYS) {
try!(write!(formatter, " Sideways"));
}
if self.intersects(FLAG_LINE_INVERTED) {
try!(write!(formatter, " Inverted"));
}
} else {
try!(write!(formatter, "H"));
}