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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
//! Computed types for box properties.
use crate::values::animated::{Animate, Procedure, ToAnimatedValue};
use crate::values::computed::font::FixedPoint;
use crate::values::computed::length::{LengthPercentage, NonNegativeLength};
use crate::values::computed::{Context, Integer, Number, ToComputedValue};
use crate::values::generics::box_::{
GenericContainIntrinsicSize, GenericLineClamp, GenericPerspective, GenericVerticalAlign,
};
use crate::values::specified::box_ as specified;
use std::fmt;
use style_traits::{CssWriter, ToCss};
pub use crate::values::specified::box_::{
Appearance, BaselineSource, BreakBetween, BreakWithin, Clear, Contain,
ContainerName, ContainerType, ContentVisibility, Display, Float, Overflow,
OverflowAnchor, OverflowClipBox, OverscrollBehavior, ScrollSnapAlign, ScrollSnapAxis,
ScrollSnapStop, ScrollSnapStrictness, ScrollSnapType, ScrollbarGutter, TouchAction, WillChange,
};
/// A computed value for the `vertical-align` property.
pub type VerticalAlign = GenericVerticalAlign<LengthPercentage>;
/// A computed value for the `contain-intrinsic-size` property.
pub type ContainIntrinsicSize = GenericContainIntrinsicSize<NonNegativeLength>;
impl ContainIntrinsicSize {
/// Converts contain-intrinsic-size to auto style.
pub fn add_auto_if_needed(&self) -> Option<Self> {
Some(match *self {
Self::None => Self::AutoNone,
Self::Length(ref l) => Self::AutoLength(*l),
Self::AutoNone | Self::AutoLength(..) => return None,
})
}
}
/// A computed value for the `line-clamp` property.
pub type LineClamp = GenericLineClamp<Integer>;
impl Animate for LineClamp {
#[inline]
fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> {
if self.is_none() != other.is_none() {
return Err(());
}
if self.is_none() {
return Ok(Self::none());
}
Ok(Self(self.0.animate(&other.0, procedure)?.max(1)))
}
}
/// A computed value for the `perspective` property.
pub type Perspective = GenericPerspective<NonNegativeLength>;
/// A computed value for the `resize` property.
#[allow(missing_docs)]
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
#[derive(Clone, Copy, Debug, Eq, Hash, MallocSizeOf, Parse, PartialEq, ToCss, ToResolvedValue)]
#[repr(u8)]
pub enum Resize {
None,
Both,
Horizontal,
Vertical,
}
impl ToComputedValue for specified::Resize {
type ComputedValue = Resize;
#[inline]
fn to_computed_value(&self, context: &Context) -> Resize {
let is_vertical = context.style().writing_mode.is_vertical();
match self {
specified::Resize::Inline => {
context
.rule_cache_conditions
.borrow_mut()
.set_writing_mode_dependency(context.builder.writing_mode);
if is_vertical {
Resize::Vertical
} else {
Resize::Horizontal
}
},
specified::Resize::Block => {
context
.rule_cache_conditions
.borrow_mut()
.set_writing_mode_dependency(context.builder.writing_mode);
if is_vertical {
Resize::Horizontal
} else {
Resize::Vertical
}
},
specified::Resize::None => Resize::None,
specified::Resize::Both => Resize::Both,
specified::Resize::Horizontal => Resize::Horizontal,
specified::Resize::Vertical => Resize::Vertical,
}
}
#[inline]
fn from_computed_value(computed: &Resize) -> specified::Resize {
match computed {
Resize::None => specified::Resize::None,
Resize::Both => specified::Resize::Both,
Resize::Horizontal => specified::Resize::Horizontal,
Resize::Vertical => specified::Resize::Vertical,
}
}
}
/// We use an unsigned 10.6 fixed-point value (range 0.0 - 1023.984375).
pub const ZOOM_FRACTION_BITS: u16 = 6;
/// This is an alias which is useful mostly as a cbindgen / C++ inference workaround.
pub type ZoomFixedPoint = FixedPoint<u16, ZOOM_FRACTION_BITS>;
/// The computed `zoom` property value. We store it as a 16-bit fixed point because we need to
/// store it efficiently in the ComputedStyle representation. The assumption being that zooms over
/// 1000 aren't quite useful.
#[derive(
Clone,
ComputeSquaredDistance,
Copy,
Debug,
Hash,
MallocSizeOf,
PartialEq,
PartialOrd,
ToResolvedValue,
)]
#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))]
#[repr(C)]
pub struct Zoom(ZoomFixedPoint);
impl ToComputedValue for specified::Zoom {
type ComputedValue = Zoom;
#[inline]
fn to_computed_value(&self, _: &Context) -> Self::ComputedValue {
let n = match *self {
Self::Normal => return Zoom::ONE,
Self::Document => return Zoom::DOCUMENT,
Self::Value(ref n) => n.0.to_number().get(),
};
if n == 0.0 {
// For legacy reasons, zoom: 0 (and 0%) computes to 1. ¯\_(ツ)_/¯
return Zoom::ONE;
}
Zoom(ZoomFixedPoint::from_float(n))
}
#[inline]
fn from_computed_value(computed: &Self::ComputedValue) -> Self {
Self::new_number(computed.value())
}
}
impl ToCss for Zoom {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: fmt::Write,
{
use std::fmt::Write;
if *self == Self::DOCUMENT {
return dest.write_str("document");
}
self.value().to_css(dest)
}
}
impl ToAnimatedValue for Zoom {
type AnimatedValue = Number;
#[inline]
fn to_animated_value(self, _: &crate::values::animated::Context) -> Self::AnimatedValue {
self.value()
}
#[inline]
fn from_animated_value(animated: Self::AnimatedValue) -> Self {
Zoom(ZoomFixedPoint::from_float(animated.max(0.0)))
}
}
impl Zoom {
/// The value 1. This is by far the most common value.
pub const ONE: Zoom = Zoom(ZoomFixedPoint {
value: 1 << ZOOM_FRACTION_BITS,
});
/// The `document` value. This can appear in the computed zoom property value, but not in the
/// `effective_zoom` field.
pub const DOCUMENT: Zoom = Zoom(ZoomFixedPoint { value: 0 });
/// Returns whether we're the number 1.
#[inline]
pub fn is_one(self) -> bool {
self == Self::ONE
}
/// Returns whether we're the `document` keyword.
#[inline]
pub fn is_document(self) -> bool {
self == Self::DOCUMENT
}
/// Returns the inverse of our value.
#[inline]
pub fn inverted(&self) -> Option<Self> {
if self.0.value == 0 {
return None;
}
Some(Self(Self::ONE.0 / self.0))
}
/// Returns the value as a float.
#[inline]
pub fn value(&self) -> f32 {
self.0.to_float()
}
/// Computes the effective zoom for a given new zoom value in rhs.
pub fn compute_effective(self, specified: Self) -> Self {
if specified == Self::DOCUMENT {
return Self::ONE;
}
if self == Self::ONE {
return specified;
}
if specified == Self::ONE {
return self;
}
Zoom(self.0 * specified.0)
}
/// Returns the zoomed value.
#[inline]
pub fn zoom(self, value: f32) -> f32 {
if self == Self::ONE {
return value;
}
value * self.value()
}
/// Returns the un-zoomed value.
#[inline]
pub fn unzoom(self, value: f32) -> f32 {
// Avoid division by zero if our effective zoom computation ends up being zero.
if self == Self::ONE || self.0.value == 0 {
return value;
}
value / self.value()
}
}