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style: Add a Zero trait that doesn't require Add, and use it in place of num_traits and IsZeroLength.

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Use it to be consistent in InsetRect serialization and storage between Servo and
Gecko.

Differential Revision: https://phabricator.services.mozilla.com/D21493
This commit is contained in:
Emilio Cobos Álvarez 2019-02-28 19:03:03 +00:00
parent 4496411edc
commit 7d01114cbf
29 changed files with 179 additions and 186 deletions
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37
components/style/values/computed/border.rs
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@ -14,6 +14,7 @@ use crate::values::generics::border::BorderSpacing as GenericBorderSpacing;
use crate::values::generics::rect::Rect;
use crate::values::generics::size::Size2D;
use crate::values::generics::NonNegative;
use crate::Zero;
use app_units::Au;
pub use crate::values::specified::border::BorderImageRepeat;
@ -75,39 +76,3 @@ impl BorderSpacing {
Au::from(*self.0.height())
}
}
impl BorderCornerRadius {
/// Returns `0 0`.
pub fn zero() -> Self {
GenericBorderCornerRadius(Size2D::new(
NonNegativeLengthPercentage::zero(),
NonNegativeLengthPercentage::zero(),
))
}
}
impl BorderRadius {
/// Returns a `0` border radius.
pub fn zero() -> Self {
Self {
top_left: BorderCornerRadius::zero(),
top_right: BorderCornerRadius::zero(),
bottom_right: BorderCornerRadius::zero(),
bottom_left: BorderCornerRadius::zero(),
}
}
/// Returns whether all the values are `0px`.
pub fn all_zero(&self) -> bool {
fn all(corner: &BorderCornerRadius) -> bool {
fn is_zero(l: &NonNegativeLengthPercentage) -> bool {
*l == NonNegativeLengthPercentage::zero()
}
is_zero(corner.0.width()) && is_zero(corner.0.height())
}
all(&self.top_left) &&
all(&self.top_right) &&
all(&self.bottom_left) &&
all(&self.bottom_right)
}
}