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mod.rs
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/
mod.rs
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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Computed values.
use app_units::Au;
use euclid::size::Size2D;
use font_metrics::FontMetricsProvider;
use media_queries::Device;
use properties::ComputedValues;
use std::fmt;
use style_traits::ToCss;
use super::{CSSFloat, CSSInteger, RGBA, specified};
use super::specified::grid::{TrackBreadth as GenericTrackBreadth, TrackSize as GenericTrackSize};
pub use cssparser::Color as CSSColor;
pub use self::image::{AngleOrCorner, EndingShape as GradientShape, Gradient, GradientKind, Image};
pub use self::image::{LengthOrKeyword, LengthOrPercentageOrKeyword};
pub use super::{Auto, Either, None_};
#[cfg(feature = "gecko")]
pub use super::specified::{AlignItems, AlignJustifyContent, AlignJustifySelf, JustifyItems};
pub use super::specified::{Angle, BorderStyle, GridLine, Percentage, Time, UrlOrNone};
pub use super::specified::url::SpecifiedUrl;
pub use self::length::{CalcLengthOrPercentage, Length, LengthOrNumber, LengthOrPercentage, LengthOrPercentageOrAuto};
pub use self::length::{LengthOrPercentageOrAutoOrContent, LengthOrPercentageOrNone, LengthOrNone};
pub use self::length::{MaxLength, MinLength};
pub use self::position::Position;
pub mod basic_shape;
pub mod image;
pub mod length;
pub mod position;
/// A `Context` is all the data a specified value could ever need to compute
/// itself and be transformed to a computed value.
pub struct Context<'a> {
/// Whether the current element is the root element.
pub is_root_element: bool,
/// The Device holds the viewport and other external state.
pub device: &'a Device,
/// The style we're inheriting from.
pub inherited_style: &'a ComputedValues,
/// The style of the layout parent node. This will almost always be
/// `inherited_style`, except when `display: contents` is at play, in which
/// case it's the style of the last ancestor with a `display` value that
/// isn't `contents`.
pub layout_parent_style: &'a ComputedValues,
/// Values access through this need to be in the properties "computed
/// early": color, text-decoration, font-size, display, position, float,
/// border-*-style, outline-style, font-family, writing-mode...
pub style: ComputedValues,
/// A font metrics provider, used to access font metrics to implement
/// font-relative units.
///
/// TODO(emilio): This should be required, see #14079.
pub font_metrics_provider: Option<&'a FontMetricsProvider>,
}
impl<'a> Context<'a> {
/// Whether the current element is the root element.
pub fn is_root_element(&self) -> bool { self.is_root_element }
/// The current viewport size.
pub fn viewport_size(&self) -> Size2D<Au> { self.device.au_viewport_size() }
/// The style we're inheriting from.
pub fn inherited_style(&self) -> &ComputedValues { &self.inherited_style }
/// The current style. Note that only "eager" properties should be accessed
/// from here, see the comment in the member.
pub fn style(&self) -> &ComputedValues { &self.style }
/// A mutable reference to the current style.
pub fn mutate_style(&mut self) -> &mut ComputedValues { &mut self.style }
}
/// A trait to represent the conversion between computed and specified values.
pub trait ToComputedValue {
/// The computed value type we're going to be converted to.
type ComputedValue;
/// Convert a specified value to a computed value, using itself and the data
/// inside the `Context`.
#[inline]
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue;
#[inline]
/// Convert a computed value to specified value form.
///
/// This will be used for recascading during animation.
/// Such from_computed_valued values should recompute to the same value.
fn from_computed_value(computed: &Self::ComputedValue) -> Self;
}
/// A marker trait to represent that the specified value is also the computed
/// value.
pub trait ComputedValueAsSpecified {}
impl<T> ToComputedValue for T
where T: ComputedValueAsSpecified + Clone,
{
type ComputedValue = T;
#[inline]
fn to_computed_value(&self, _context: &Context) -> T {
self.clone()
}
#[inline]
fn from_computed_value(computed: &T) -> Self {
computed.clone()
}
}
impl ToComputedValue for specified::Color {
type ComputedValue = RGBA;
#[cfg(not(feature = "gecko"))]
fn to_computed_value(&self, context: &Context) -> RGBA {
match *self {
specified::Color::RGBA(rgba) => rgba,
specified::Color::CurrentColor => context.inherited_style.get_color().clone_color(),
}
}
#[cfg(feature = "gecko")]
fn to_computed_value(&self, context: &Context) -> RGBA {
use gecko::values::convert_nscolor_to_rgba as to_rgba;
// It's safe to access the nsPresContext immutably during style computation.
let pres_context = unsafe { &*context.device.pres_context };
match *self {
specified::Color::RGBA(rgba) => rgba,
specified::Color::System(system) => to_rgba(system.to_computed_value(context)),
specified::Color::CurrentColor => context.inherited_style.get_color().clone_color(),
specified::Color::MozDefaultColor => to_rgba(pres_context.mDefaultColor),
specified::Color::MozDefaultBackgroundColor => to_rgba(pres_context.mBackgroundColor),
specified::Color::MozHyperlinktext => to_rgba(pres_context.mLinkColor),
specified::Color::MozActiveHyperlinktext => to_rgba(pres_context.mActiveLinkColor),
specified::Color::MozVisitedHyperlinktext => to_rgba(pres_context.mVisitedLinkColor),
}
}
fn from_computed_value(computed: &RGBA) -> Self {
specified::Color::RGBA(*computed)
}
}
impl ToComputedValue for specified::CSSColor {
type ComputedValue = CSSColor;
#[cfg(not(feature = "gecko"))]
#[inline]
fn to_computed_value(&self, _context: &Context) -> CSSColor {
self.parsed
}
#[cfg(feature = "gecko")]
#[inline]
fn to_computed_value(&self, context: &Context) -> CSSColor {
match self.parsed {
specified::Color::RGBA(rgba) => CSSColor::RGBA(rgba),
specified::Color::CurrentColor => CSSColor::CurrentColor,
// Resolve non-standard -moz keywords to RGBA:
non_standard => CSSColor::RGBA(non_standard.to_computed_value(context)),
}
}
#[inline]
fn from_computed_value(computed: &CSSColor) -> Self {
specified::CSSColor {
parsed: match *computed {
CSSColor::RGBA(rgba) => specified::Color::RGBA(rgba),
CSSColor::CurrentColor => specified::Color::CurrentColor,
},
authored: None,
}
}
}
#[cfg(feature = "gecko")]
impl ToComputedValue for specified::JustifyItems {
type ComputedValue = JustifyItems;
// https://drafts.csswg.org/css-align/#valdef-justify-items-auto
fn to_computed_value(&self, context: &Context) -> JustifyItems {
use values::specified::align;
// If the inherited value of `justify-items` includes the `legacy` keyword, `auto` computes
// to the inherited value.
if self.0 == align::ALIGN_AUTO {
let inherited = context.inherited_style.get_position().clone_justify_items();
if inherited.0.contains(align::ALIGN_LEGACY) {
return inherited
}
}
return *self
}
#[inline]
fn from_computed_value(computed: &JustifyItems) -> Self {
*computed
}
}
#[cfg(feature = "gecko")]
impl ComputedValueAsSpecified for specified::AlignItems {}
#[cfg(feature = "gecko")]
impl ComputedValueAsSpecified for specified::AlignJustifyContent {}
#[cfg(feature = "gecko")]
impl ComputedValueAsSpecified for specified::AlignJustifySelf {}
impl ComputedValueAsSpecified for specified::BorderStyle {}
#[derive(Debug, PartialEq, Clone, Copy)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[allow(missing_docs)]
pub struct BorderRadiusSize(pub Size2D<LengthOrPercentage>);
impl BorderRadiusSize {
#[allow(missing_docs)]
pub fn zero() -> BorderRadiusSize {
BorderRadiusSize(Size2D::new(LengthOrPercentage::Length(Au(0)), LengthOrPercentage::Length(Au(0))))
}
}
impl ToComputedValue for specified::BorderRadiusSize {
type ComputedValue = BorderRadiusSize;
#[inline]
fn to_computed_value(&self, context: &Context) -> BorderRadiusSize {
let w = self.0.width.to_computed_value(context);
let h = self.0.height.to_computed_value(context);
BorderRadiusSize(Size2D::new(w, h))
}
#[inline]
fn from_computed_value(computed: &BorderRadiusSize) -> Self {
let w = ToComputedValue::from_computed_value(&computed.0.width);
let h = ToComputedValue::from_computed_value(&computed.0.height);
specified::BorderRadiusSize(Size2D::new(w, h))
}
}
impl ToCss for BorderRadiusSize {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
try!(self.0.width.to_css(dest));
try!(dest.write_str("/"));
self.0.height.to_css(dest)
}
}
#[derive(Debug, PartialEq, Clone, Copy)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[allow(missing_docs)]
pub struct Shadow {
pub offset_x: Au,
pub offset_y: Au,
pub blur_radius: Au,
pub spread_radius: Au,
pub color: CSSColor,
pub inset: bool,
}
/// A `<number>` value.
pub type Number = CSSFloat;
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[allow(missing_docs)]
pub enum NumberOrPercentage {
Percentage(Percentage),
Number(Number),
}
impl ToComputedValue for specified::NumberOrPercentage {
type ComputedValue = NumberOrPercentage;
#[inline]
fn to_computed_value(&self, context: &Context) -> NumberOrPercentage {
match *self {
specified::NumberOrPercentage::Percentage(percentage) =>
NumberOrPercentage::Percentage(percentage.to_computed_value(context)),
specified::NumberOrPercentage::Number(number) =>
NumberOrPercentage::Number(number.to_computed_value(context)),
}
}
#[inline]
fn from_computed_value(computed: &NumberOrPercentage) -> Self {
match *computed {
NumberOrPercentage::Percentage(percentage) =>
specified::NumberOrPercentage::Percentage(ToComputedValue::from_computed_value(&percentage)),
NumberOrPercentage::Number(number) =>
specified::NumberOrPercentage::Number(ToComputedValue::from_computed_value(&number)),
}
}
}
impl ToCss for NumberOrPercentage {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
match *self {
NumberOrPercentage::Percentage(percentage) => percentage.to_css(dest),
NumberOrPercentage::Number(number) => number.to_css(dest),
}
}
}
/// A type used for opacity.
pub type Opacity = CSSFloat;
/// A `<integer>` value.
pub type Integer = CSSInteger;
/// <integer> | auto
pub type IntegerOrAuto = Either<CSSInteger, Auto>;
impl IntegerOrAuto {
/// Returns the integer value if it is an integer, otherwise return
/// the given value.
pub fn integer_or(&self, auto_value: CSSInteger) -> CSSInteger {
match *self {
Either::First(n) => n,
Either::Second(Auto) => auto_value,
}
}
}
/// An SVG paint value
///
/// https://www.w3.org/TR/SVG2/painting.html#SpecifyingPaint
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
pub struct SVGPaint {
/// The paint source
pub kind: SVGPaintKind,
/// The fallback color
pub fallback: Option<CSSColor>,
}
impl Default for SVGPaint {
fn default() -> Self {
SVGPaint {
kind: SVGPaintKind::None,
fallback: None,
}
}
}
impl SVGPaint {
/// Opaque black color
pub fn black() -> Self {
let rgba = RGBA::from_floats(0., 0., 0., 1.);
SVGPaint {
kind: SVGPaintKind::Color(CSSColor::RGBA(rgba)),
fallback: None,
}
}
}
/// An SVG paint value without the fallback
///
/// Whereas the spec only allows PaintServer
/// to have a fallback, Gecko lets the context
/// properties have a fallback as well.
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
pub enum SVGPaintKind {
/// `none`
None,
/// `<color>`
Color(CSSColor),
/// `url(...)`
PaintServer(SpecifiedUrl),
/// `context-fill`
ContextFill,
/// `context-stroke`
ContextStroke,
}
impl ToCss for SVGPaintKind {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
match *self {
SVGPaintKind::None => dest.write_str("none"),
SVGPaintKind::ContextStroke => dest.write_str("context-stroke"),
SVGPaintKind::ContextFill => dest.write_str("context-fill"),
SVGPaintKind::Color(ref color) => color.to_css(dest),
SVGPaintKind::PaintServer(ref server) => server.to_css(dest),
}
}
}
impl ToCss for SVGPaint {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
self.kind.to_css(dest)?;
if let Some(ref fallback) = self.fallback {
fallback.to_css(dest)?;
}
Ok(())
}
}
/// <length> | <percentage> | <number>
pub type LoPOrNumber = Either<LengthOrPercentage, Number>;
#[derive(Clone, PartialEq, Eq, Copy, Debug)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[allow(missing_docs)]
/// A computed cliprect for clip and image-region
pub struct ClipRect {
pub top: Option<Au>,
pub right: Option<Au>,
pub bottom: Option<Au>,
pub left: Option<Au>,
}
impl ToCss for ClipRect {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
try!(dest.write_str("rect("));
if let Some(top) = self.top {
try!(top.to_css(dest));
try!(dest.write_str(", "));
} else {
try!(dest.write_str("auto, "));
}
if let Some(right) = self.right {
try!(right.to_css(dest));
try!(dest.write_str(", "));
} else {
try!(dest.write_str("auto, "));
}
if let Some(bottom) = self.bottom {
try!(bottom.to_css(dest));
try!(dest.write_str(", "));
} else {
try!(dest.write_str("auto, "));
}
if let Some(left) = self.left {
try!(left.to_css(dest));
} else {
try!(dest.write_str("auto"));
}
dest.write_str(")")
}
}
/// rect(...) | auto
pub type ClipRectOrAuto = Either<ClipRect, Auto>;
/// The computed value of a grid `<track-breadth>`
pub type TrackBreadth = GenericTrackBreadth<LengthOrPercentage>;
/// The computed value of a grid `<track-size>`
pub type TrackSize = GenericTrackSize<LengthOrPercentage>;
impl ClipRectOrAuto {
/// Return an auto (default for clip-rect and image-region) value
pub fn auto() -> Self {
Either::Second(Auto)
}
/// Check if it is auto
pub fn is_auto(&self) -> bool {
match *self {
Either::Second(_) => true,
_ => false
}
}
}
/// <color> | auto
pub type ColorOrAuto = Either<CSSColor, Auto>;