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style: Derive ToCss for TimingFunction.

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Emilio Cobos Álvarez 2018-03-07 13:20:39 +01:00
parent 951250882b
commit 0d7dae1f85
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1 changed files with 10 additions and 47 deletions
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57
components/style/values/generics/transform.rs
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@ -80,12 +80,13 @@ pub struct TransformOrigin<H, V, Depth> {
/// A generic timing function.
///
/// <https://drafts.csswg.org/css-timing-1/#single-timing-function-production>
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq)]
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss)]
pub enum TimingFunction<Integer, Number> {
/// `linear | ease | ease-in | ease-out | ease-in-out`
Keyword(TimingKeyword),
/// `cubic-bezier(<number>, <number>, <number>, <number>)`
#[allow(missing_docs)]
#[css(comma, function)]
CubicBezier {
x1: Number,
y1: Number,
@ -93,8 +94,10 @@ pub enum TimingFunction<Integer, Number> {
y2: Number,
},
/// `step-start | step-end | steps(<integer>, [ start | end ]?)`
Steps(Integer, StepPosition),
#[css(comma, function)]
Steps(Integer, #[css(skip_if = "is_end")] StepPosition),
/// `frames(<integer>)`
#[css(comma, function)]
Frames(Integer),
}
@ -119,6 +122,11 @@ pub enum StepPosition {
End,
}
#[inline]
fn is_end(position: &StepPosition) -> bool {
*position == StepPosition::End
}
impl<H, V, D> TransformOrigin<H, V, D> {
/// Returns a new transform origin.
pub fn new(horizontal: H, vertical: V, depth: D) -> Self {
@ -138,51 +146,6 @@ impl<Integer, Number> TimingFunction<Integer, Number> {
}
}
impl<Integer, Number> ToCss for TimingFunction<Integer, Number>
where
Integer: ToCss,
Number: ToCss,
{
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
match *self {
TimingFunction::Keyword(keyword) => keyword.to_css(dest),
TimingFunction::CubicBezier {
ref x1,
ref y1,
ref x2,
ref y2,
} => {
dest.write_str("cubic-bezier(")?;
x1.to_css(dest)?;
dest.write_str(", ")?;
y1.to_css(dest)?;
dest.write_str(", ")?;
x2.to_css(dest)?;
dest.write_str(", ")?;
y2.to_css(dest)?;
dest.write_str(")")
},
TimingFunction::Steps(ref intervals, position) => {
dest.write_str("steps(")?;
intervals.to_css(dest)?;
if position != StepPosition::End {
dest.write_str(", ")?;
position.to_css(dest)?;
}
dest.write_str(")")
},
TimingFunction::Frames(ref frames) => {
dest.write_str("frames(")?;
frames.to_css(dest)?;
dest.write_str(")")
},
}
}
}
impl TimingKeyword {
/// Returns the keyword as a quadruplet of Bezier point coordinates
/// `(x1, y1, x2, y2)`.