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Switch z-index to use predefined integer type

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This commit is contained in:
Xidorn Quan 2017-03-17 17:52:44 +11:00
parent b489c4ed90
commit 9233882d49
4 changed files with 17 additions and 78 deletions
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52
components/style/properties/longhand/position.mako.rs
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@ -23,54 +23,10 @@
animatable=True, logical=True)}
% endfor
<%helpers:longhand name="z-index" spec="https://www.w3.org/TR/CSS2/visuren.html#z-index" animatable="True">
use values::HasViewportPercentage;
use values::computed::ComputedValueAsSpecified;
impl ComputedValueAsSpecified for SpecifiedValue {}
no_viewport_percentage!(SpecifiedValue);
pub type SpecifiedValue = computed_value::T;
pub mod computed_value {
use std::fmt;
use style_traits::ToCss;
#[derive(PartialEq, Clone, Eq, Copy, Debug)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
pub enum T {
Auto,
Number(i32),
}
impl ToCss for T {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
match *self {
T::Auto => dest.write_str("auto"),
T::Number(number) => write!(dest, "{}", number),
}
}
}
impl T {
pub fn number_or_zero(self) -> i32 {
match self {
T::Auto => 0,
T::Number(value) => value,
}
}
}
}
#[inline]
pub fn get_initial_value() -> computed_value::T {
computed_value::T::Auto
}
fn parse(_context: &ParserContext, input: &mut Parser) -> Result<SpecifiedValue, ()> {
if input.try(|input| input.expect_ident_matching("auto")).is_ok() {
Ok(computed_value::T::Auto)
} else {
specified::parse_integer(input).map(computed_value::T::Number)
}
}
</%helpers:longhand>
${helpers.predefined_type("z-index", "IntegerOrAuto",
"Either::Second(Auto)",
spec="https://www.w3.org/TR/CSS2/visuren.html#z-index",
animatable="True")}
// CSS Flexible Box Layout Module Level 1
// http://www.w3.org/TR/css3-flexbox/