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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
//! `<length>` computed values, and related ones.
use super::{Context, Number, ToComputedValue};
use crate::values::animated::ToAnimatedValue;
use crate::values::computed::NonNegativeNumber;
use crate::values::generics::length as generics;
use crate::values::generics::length::{
GenericLengthOrNumber, GenericLengthPercentageOrNormal, GenericMaxSize, GenericSize,
};
use crate::values::generics::NonNegative;
use crate::values::resolved::{Context as ResolvedContext, ToResolvedValue};
use crate::values::specified::length::{AbsoluteLength, FontBaseSize, LineHeightBase};
use crate::values::{specified, CSSFloat};
use crate::Zero;
use app_units::Au;
use std::fmt::{self, Write};
use std::ops::{Add, AddAssign, Div, Mul, MulAssign, Neg, Sub};
use style_traits::{CSSPixel, CssWriter, ToCss};
pub use super::image::Image;
pub use super::length_percentage::{LengthPercentage, NonNegativeLengthPercentage};
pub use crate::values::specified::url::UrlOrNone;
pub use crate::values::specified::{Angle, BorderStyle, Time};
impl ToComputedValue for specified::NoCalcLength {
type ComputedValue = Length;
#[inline]
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
self.to_computed_value_with_base_size(
context,
FontBaseSize::CurrentStyle,
LineHeightBase::CurrentStyle,
)
}
#[inline]
fn from_computed_value(computed: &Self::ComputedValue) -> Self {
Self::Absolute(AbsoluteLength::Px(computed.px()))
}
}
impl specified::NoCalcLength {
/// Computes a length with a given font-relative base size.
pub fn to_computed_value_with_base_size(
&self,
context: &Context,
base_size: FontBaseSize,
line_height_base: LineHeightBase,
) -> Length {
match *self {
Self::Absolute(length) => length.to_computed_value(context),
Self::FontRelative(length) => {
length.to_computed_value(context, base_size, line_height_base)
},
Self::ViewportPercentage(length) => length.to_computed_value(context),
Self::ContainerRelative(length) => length.to_computed_value(context),
Self::ServoCharacterWidth(length) => length
.to_computed_value(context.style().get_font().clone_font_size().computed_size()),
}
}
}
impl ToComputedValue for specified::Length {
type ComputedValue = Length;
#[inline]
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
match *self {
Self::NoCalc(l) => l.to_computed_value(context),
Self::Calc(ref calc) => {
let result = calc.to_computed_value(context);
debug_assert!(
result.to_length().is_some(),
"{:?} didn't resolve to a length: {:?}",
calc,
result,
);
result.to_length().unwrap_or_else(Length::zero)
},
}
}
#[inline]
fn from_computed_value(computed: &Self::ComputedValue) -> Self {
Self::NoCalc(specified::NoCalcLength::from_computed_value(computed))
}
}
/// Some boilerplate to share between negative and non-negative
/// length-percentage or auto.
macro_rules! computed_length_percentage_or_auto {
($inner:ty) => {
/// Returns the used value.
#[inline]
pub fn to_used_value(&self, percentage_basis: Au) -> Option<Au> {
match *self {
Self::Auto => None,
Self::LengthPercentage(ref lp) => Some(lp.to_used_value(percentage_basis)),
}
}
/// Returns true if the computed value is absolute 0 or 0%.
#[inline]
pub fn is_definitely_zero(&self) -> bool {
use crate::values::generics::length::LengthPercentageOrAuto::*;
match *self {
LengthPercentage(ref l) => l.is_definitely_zero(),
Auto => false,
}
}
};
}
/// A computed type for `<length-percentage> | auto`.
pub type LengthPercentageOrAuto = generics::GenericLengthPercentageOrAuto<LengthPercentage>;
impl LengthPercentageOrAuto {
/// Clamps the value to a non-negative value.
pub fn clamp_to_non_negative(self) -> Self {
use crate::values::generics::length::LengthPercentageOrAuto::*;
match self {
LengthPercentage(l) => LengthPercentage(l.clamp_to_non_negative()),
Auto => Auto,
}
}
/// Convert to have a borrow inside the enum
pub fn as_ref(&self) -> generics::GenericLengthPercentageOrAuto<&LengthPercentage> {
use crate::values::generics::length::LengthPercentageOrAuto::*;
match *self {
LengthPercentage(ref lp) => LengthPercentage(lp),
Auto => Auto,
}
}
computed_length_percentage_or_auto!(LengthPercentage);
}
impl generics::GenericLengthPercentageOrAuto<&LengthPercentage> {
/// Resolves the percentage.
#[inline]
pub fn percentage_relative_to(&self, basis: Length) -> LengthOrAuto {
use crate::values::generics::length::LengthPercentageOrAuto::*;
match self {
LengthPercentage(length_percentage) => {
LengthPercentage(length_percentage.percentage_relative_to(basis))
},
Auto => Auto,
}
}
/// Maybe resolves the percentage.
#[inline]
pub fn maybe_percentage_relative_to(&self, basis: Option<Length>) -> LengthOrAuto {
use crate::values::generics::length::LengthPercentageOrAuto::*;
match self {
LengthPercentage(length_percentage) => length_percentage
.maybe_percentage_relative_to(basis)
.map_or(Auto, LengthPercentage),
Auto => Auto,
}
}
}
/// A wrapper of LengthPercentageOrAuto, whose value must be >= 0.
pub type NonNegativeLengthPercentageOrAuto =
generics::GenericLengthPercentageOrAuto<NonNegativeLengthPercentage>;
impl NonNegativeLengthPercentageOrAuto {
computed_length_percentage_or_auto!(NonNegativeLengthPercentage);
}
#[cfg(feature = "servo")]
impl MaxSize {
/// Convert the computed value into used value.
#[inline]
pub fn to_used_value(&self, percentage_basis: Au) -> Option<Au> {
match *self {
GenericMaxSize::None => None,
GenericMaxSize::LengthPercentage(ref lp) => Some(lp.to_used_value(percentage_basis)),
}
}
}
impl Size {
/// Convert the computed value into used value.
#[inline]
#[cfg(feature = "servo")]
pub fn to_used_value(&self, percentage_basis: Au) -> Option<Au> {
match *self {
GenericSize::Auto => None,
GenericSize::LengthPercentage(ref lp) => Some(lp.to_used_value(percentage_basis)),
}
}
/// Returns true if the computed value is absolute 0 or 0%.
#[inline]
pub fn is_definitely_zero(&self) -> bool {
match *self {
Self::Auto => false,
Self::LengthPercentage(ref lp) => lp.is_definitely_zero(),
#[cfg(feature = "gecko")]
Self::MinContent |
Self::MaxContent |
Self::FitContent |
Self::MozAvailable |
Self::FitContentFunction(_) => false,
}
}
}
/// The computed `<length>` value.
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Deserialize,
MallocSizeOf,
PartialEq,
PartialOrd,
Serialize,
ToAnimatedValue,
ToAnimatedZero,
ToComputedValue,
ToShmem,
)]
#[repr(C)]
pub struct CSSPixelLength(CSSFloat);
impl ToResolvedValue for CSSPixelLength {
type ResolvedValue = Self;
fn to_resolved_value(self, context: &ResolvedContext) -> Self::ResolvedValue {
Self(context.style.effective_zoom.unzoom(self.0))
}
#[inline]
fn from_resolved_value(value: Self::ResolvedValue) -> Self {
value
}
}
impl fmt::Debug for CSSPixelLength {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)?;
f.write_str(" px")
}
}
impl CSSPixelLength {
/// Return a new CSSPixelLength.
#[inline]
pub fn new(px: CSSFloat) -> Self {
CSSPixelLength(px)
}
/// Returns a normalized (NaN turned to zero) version of this length.
#[inline]
pub fn normalized(self) -> Self {
Self::new(crate::values::normalize(self.0))
}
/// Returns a finite (normalized and clamped to float min and max) version of this length.
#[inline]
pub fn finite(self) -> Self {
Self::new(crate::values::normalize(self.0).min(f32::MAX).max(f32::MIN))
}
/// Scale the length by a given amount.
#[inline]
pub fn scale_by(self, scale: CSSFloat) -> Self {
CSSPixelLength(self.0 * scale)
}
/// Return the containing pixel value.
#[inline]
pub fn px(self) -> CSSFloat {
self.0
}
/// Return the length with app_unit i32 type.
#[inline]
pub fn to_i32_au(self) -> i32 {
Au::from(self).0
}
/// Return the absolute value of this length.
#[inline]
pub fn abs(self) -> Self {
CSSPixelLength::new(self.0.abs())
}
/// Return the clamped value of this length.
#[inline]
pub fn clamp_to_non_negative(self) -> Self {
CSSPixelLength::new(self.0.max(0.))
}
/// Returns the minimum between `self` and `other`.
#[inline]
pub fn min(self, other: Self) -> Self {
CSSPixelLength::new(self.0.min(other.0))
}
/// Returns the maximum between `self` and `other`.
#[inline]
pub fn max(self, other: Self) -> Self {
CSSPixelLength::new(self.0.max(other.0))
}
/// Sets `self` to the maximum between `self` and `other`.
#[inline]
pub fn max_assign(&mut self, other: Self) {
*self = self.max(other);
}
/// Clamp the value to a lower bound and an optional upper bound.
///
/// Can be used for example with `min-width` and `max-width`.
#[inline]
pub fn clamp_between_extremums(self, min_size: Self, max_size: Option<Self>) -> Self {
self.clamp_below_max(max_size).max(min_size)
}
/// Clamp the value to an optional upper bound.
///
/// Can be used for example with `max-width`.
#[inline]
pub fn clamp_below_max(self, max_size: Option<Self>) -> Self {
match max_size {
None => self,
Some(max_size) => self.min(max_size),
}
}
}
impl num_traits::Zero for CSSPixelLength {
fn zero() -> Self {
CSSPixelLength::new(0.)
}
fn is_zero(&self) -> bool {
self.px() == 0.
}
}
impl ToCss for CSSPixelLength {
#[inline]
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
self.0.to_css(dest)?;
dest.write_str("px")
}
}
impl std::iter::Sum for CSSPixelLength {
fn sum<I: Iterator<Item = Self>>(iter: I) -> Self {
iter.fold(Length::zero(), Add::add)
}
}
impl Add for CSSPixelLength {
type Output = Self;
#[inline]
fn add(self, other: Self) -> Self {
Self::new(self.px() + other.px())
}
}
impl AddAssign for CSSPixelLength {
#[inline]
fn add_assign(&mut self, other: Self) {
self.0 += other.0;
}
}
impl Div for CSSPixelLength {
type Output = CSSFloat;
#[inline]
fn div(self, other: Self) -> CSSFloat {
self.px() / other.px()
}
}
impl Div<CSSFloat> for CSSPixelLength {
type Output = Self;
#[inline]
fn div(self, other: CSSFloat) -> Self {
Self::new(self.px() / other)
}
}
impl MulAssign<CSSFloat> for CSSPixelLength {
#[inline]
fn mul_assign(&mut self, other: CSSFloat) {
self.0 *= other;
}
}
impl Mul<CSSFloat> for CSSPixelLength {
type Output = Self;
#[inline]
fn mul(self, other: CSSFloat) -> Self {
Self::new(self.px() * other)
}
}
impl Neg for CSSPixelLength {
type Output = Self;
#[inline]
fn neg(self) -> Self {
CSSPixelLength::new(-self.0)
}
}
impl Sub for CSSPixelLength {
type Output = Self;
#[inline]
fn sub(self, other: Self) -> Self {
Self::new(self.px() - other.px())
}
}
impl From<CSSPixelLength> for Au {
#[inline]
fn from(len: CSSPixelLength) -> Self {
Au::from_f32_px(len.0)
}
}
impl From<Au> for CSSPixelLength {
#[inline]
fn from(len: Au) -> Self {
CSSPixelLength::new(len.to_f32_px())
}
}
impl From<CSSPixelLength> for euclid::Length<CSSFloat, CSSPixel> {
#[inline]
fn from(length: CSSPixelLength) -> Self {
Self::new(length.0)
}
}
/// An alias of computed `<length>` value.
pub type Length = CSSPixelLength;
/// Either a computed `<length>` or the `auto` keyword.
pub type LengthOrAuto = generics::GenericLengthPercentageOrAuto<Length>;
/// Either a non-negative `<length>` or the `auto` keyword.
pub type NonNegativeLengthOrAuto = generics::GenericLengthPercentageOrAuto<NonNegativeLength>;
/// Either a computed `<length>` or a `<number>` value.
pub type LengthOrNumber = GenericLengthOrNumber<Length, Number>;
/// A wrapper of Length, whose value must be >= 0.
pub type NonNegativeLength = NonNegative<Length>;
impl ToAnimatedValue for NonNegativeLength {
type AnimatedValue = Length;
#[inline]
fn to_animated_value(self) -> Self::AnimatedValue {
self.0
}
#[inline]
fn from_animated_value(animated: Self::AnimatedValue) -> Self {
NonNegativeLength::new(animated.px().max(0.))
}
}
impl NonNegativeLength {
/// Create a NonNegativeLength.
#[inline]
pub fn new(px: CSSFloat) -> Self {
NonNegative(Length::new(px.max(0.)))
}
/// Return the pixel value of |NonNegativeLength|.
#[inline]
pub fn px(&self) -> CSSFloat {
self.0.px()
}
#[inline]
/// Ensures it is non negative
pub fn clamp(self) -> Self {
if (self.0).0 < 0. {
Self::zero()
} else {
self
}
}
}
impl From<Length> for NonNegativeLength {
#[inline]
fn from(len: Length) -> Self {
NonNegative(len)
}
}
impl From<Au> for NonNegativeLength {
#[inline]
fn from(au: Au) -> Self {
NonNegative(au.into())
}
}
impl From<NonNegativeLength> for Au {
#[inline]
fn from(non_negative_len: NonNegativeLength) -> Self {
Au::from(non_negative_len.0)
}
}
/// Either a computed NonNegativeLengthPercentage or the `normal` keyword.
pub type NonNegativeLengthPercentageOrNormal =
GenericLengthPercentageOrNormal<NonNegativeLengthPercentage>;
/// Either a non-negative `<length>` or a `<number>`.
pub type NonNegativeLengthOrNumber = GenericLengthOrNumber<NonNegativeLength, NonNegativeNumber>;
/// A computed value for `min-width`, `min-height`, `width` or `height` property.
pub type Size = GenericSize<NonNegativeLengthPercentage>;
/// A computed value for `max-width` or `min-height` property.
pub type MaxSize = GenericMaxSize<NonNegativeLengthPercentage>;