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Adds scroll-snap-type shorthand property, tests

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This commit is contained in:
Rohit Burra 2016-11-07 09:38:03 +05:30
parent 75d35241db
commit bdedcb9eb4
2 changed files with 83 additions and 0 deletions
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34
components/style/properties/shorthand/box.mako.rs
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@ -297,3 +297,37 @@ macro_rules! try_parse_one {
}
}
</%helpers:shorthand>
<%helpers:shorthand name="scroll-snap-type" products="gecko"
sub_properties="scroll-snap-type-x scroll-snap-type-y">
use properties::longhands::scroll_snap_type_x;
pub fn parse_value(context: &ParserContext, input: &mut Parser) -> Result<Longhands, ()> {
let result = try!(scroll_snap_type_x::parse(context, input));
Ok(Longhands {
scroll_snap_type_x: Some(result),
scroll_snap_type_y: Some(result),
})
}
impl<'a> LonghandsToSerialize<'a> {
// Serializes into the single keyword value if both scroll-snap-type and scroll-snap-type-y are same.
// Otherwise into an empty string. This is done to match Gecko's behaviour.
fn to_css_declared<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
let x_and_y_equal = match (self.scroll_snap_type_x, self.scroll_snap_type_y) {
(&DeclaredValue::Value(ref x_value), &DeclaredValue::Value(ref y_value)) => {
*x_value == *y_value
},
(&DeclaredValue::Initial, &DeclaredValue::Initial) => true,
(&DeclaredValue::Inherit, &DeclaredValue::Inherit) => true,
(x, y) => { *x == *y },
};
if x_and_y_equal {
self.scroll_snap_type_x.to_css(dest)
} else {
Ok(())
}
}
}
</%helpers:shorthand>