diff options
Diffstat (limited to '')
-rw-r--r-- | servo/components/style/values/computed/page.rs | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/servo/components/style/values/computed/page.rs b/servo/components/style/values/computed/page.rs new file mode 100644 index 0000000000..6f71c912cf --- /dev/null +++ b/servo/components/style/values/computed/page.rs @@ -0,0 +1,75 @@ +/* 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 https://mozilla.org/MPL/2.0/. */ + +//! Computed @page at-rule properties and named-page style properties + +use crate::values::computed::length::NonNegativeLength; +use crate::values::computed::{Context, ToComputedValue}; +use crate::values::generics; +use crate::values::generics::size::Size2D; + +use crate::values::specified::page as specified; +pub use generics::page::GenericPageSize; +pub use generics::page::PageOrientation; +pub use generics::page::PageSizeOrientation; +pub use generics::page::PaperSize; +pub use specified::PageName; + +/// Computed value of the @page size descriptor +/// +/// The spec says that the computed value should be the same as the specified +/// value but with all absolute units, but it's not currently possibly observe +/// the computed value of page-size. +#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToResolvedValue, ToShmem)] +#[repr(C, u8)] +pub enum PageSize { + /// Specified size, paper size, or paper size and orientation. + Size(Size2D<NonNegativeLength>), + /// `landscape` or `portrait` value, no specified size. + Orientation(PageSizeOrientation), + /// `auto` value + Auto, +} + +impl ToComputedValue for specified::PageSize { + type ComputedValue = PageSize; + + fn to_computed_value(&self, ctx: &Context) -> Self::ComputedValue { + match &*self { + Self::Size(s) => PageSize::Size(s.to_computed_value(ctx)), + Self::PaperSize(p, PageSizeOrientation::Landscape) => PageSize::Size(Size2D { + width: p.long_edge().to_computed_value(ctx), + height: p.short_edge().to_computed_value(ctx), + }), + Self::PaperSize(p, PageSizeOrientation::Portrait) => PageSize::Size(Size2D { + width: p.short_edge().to_computed_value(ctx), + height: p.long_edge().to_computed_value(ctx), + }), + Self::Orientation(o) => PageSize::Orientation(*o), + Self::Auto => PageSize::Auto, + } + } + + fn from_computed_value(computed: &Self::ComputedValue) -> Self { + match *computed { + PageSize::Size(s) => Self::Size(ToComputedValue::from_computed_value(&s)), + PageSize::Orientation(o) => Self::Orientation(o), + PageSize::Auto => Self::Auto, + } + } +} + +impl PageSize { + /// `auto` value. + #[inline] + pub fn auto() -> Self { + PageSize::Auto + } + + /// Whether this is the `auto` value. + #[inline] + pub fn is_auto(&self) -> bool { + matches!(*self, PageSize::Auto) + } +} |