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543703e3d8
Stylesheets for `HTMLLinkElement`s are now loaded by the resource task, triggered by the element in question. Stylesheets are owned by the elements they're associated with, which can be `HTMLStyleElement`, `HTMLLinkElement`, and `HTMLMetaElement` (for `<meta name="viewport">). Additionally, the quirks mode stylesheet (just as the user and user agent stylesheets a couple of commits ago), is implemented as a lazy static, loaded once per process and shared between all documents. This all has various nice consequences: - Stylesheet loading becomes a non-blocking operation. - Stylesheets are removed when the element they're associated with is removed from the document. - It'll be possible to implement the CSSOM APIs that require direct access to the stylesheets (i.e., ~ all of them). - Various subtle correctness issues are fixed. One piece of interesting follow-up work would be to move parsing of external stylesheets to the resource task, too. Right now, it happens in the link element once loading is complete, so blocks the script task. Moving it to the resource task would probably be fairly straight-forward as it doesn't require access to any external state.
99 lines
3.3 KiB
Rust
99 lines
3.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use cssparser::{Parser, ToCss};
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use euclid::scale_factor::ScaleFactor;
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use euclid::size::TypedSize2D;
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use std::ascii::AsciiExt;
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use std::fmt;
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use util::geometry::{PagePx, ViewportPx};
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use values::specified::AllowedNumericType;
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define_css_keyword_enum!(UserZoom:
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"zoom" => Zoom,
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"fixed" => Fixed);
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define_css_keyword_enum!(Orientation:
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"auto" => Auto,
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"portrait" => Portrait,
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"landscape" => Landscape);
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#[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
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pub struct ViewportConstraints {
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pub size: TypedSize2D<ViewportPx, f32>,
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pub initial_zoom: ScaleFactor<PagePx, ViewportPx, f32>,
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pub min_zoom: Option<ScaleFactor<PagePx, ViewportPx, f32>>,
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pub max_zoom: Option<ScaleFactor<PagePx, ViewportPx, f32>>,
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pub user_zoom: UserZoom,
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pub orientation: Orientation
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}
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impl ToCss for ViewportConstraints {
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fn to_css<W>(&self, dest: &mut W) -> fmt::Result
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where W: fmt::Write
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{
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try!(write!(dest, "@viewport {{"));
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try!(write!(dest, " width: {}px;", self.size.width.get()));
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try!(write!(dest, " height: {}px;", self.size.height.get()));
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try!(write!(dest, " zoom: {};", self.initial_zoom.get()));
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if let Some(min_zoom) = self.min_zoom {
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try!(write!(dest, " min-zoom: {};", min_zoom.get()));
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}
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if let Some(max_zoom) = self.max_zoom {
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try!(write!(dest, " max-zoom: {};", max_zoom.get()));
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}
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try!(write!(dest, " user-zoom: ")); try!(self.user_zoom.to_css(dest));
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try!(write!(dest, "; orientation: ")); try!(self.orientation.to_css(dest));
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write!(dest, "; }}")
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}
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}
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/// Zoom is a number | percentage | auto
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/// See http://dev.w3.org/csswg/css-device-adapt/#descdef-viewport-zoom
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#[derive(Copy, Clone, Debug, HeapSizeOf, PartialEq)]
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pub enum Zoom {
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Number(f32),
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Percentage(f32),
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Auto,
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}
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impl ToCss for Zoom {
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fn to_css<W>(&self, dest: &mut W) -> fmt::Result
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where W: fmt::Write
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{
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match *self {
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Zoom::Number(number) => write!(dest, "{}", number),
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Zoom::Percentage(percentage) => write!(dest, "{}%", percentage * 100.),
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Zoom::Auto => write!(dest, "auto")
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}
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}
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}
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impl Zoom {
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pub fn parse(input: &mut Parser) -> Result<Zoom, ()> {
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use cssparser::Token;
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match try!(input.next()) {
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Token::Percentage(ref value) if AllowedNumericType::NonNegative.is_ok(value.unit_value) =>
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Ok(Zoom::Percentage(value.unit_value)),
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Token::Number(ref value) if AllowedNumericType::NonNegative.is_ok(value.value) =>
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Ok(Zoom::Number(value.value)),
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Token::Ident(ref value) if value.eq_ignore_ascii_case("auto") =>
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Ok(Zoom::Auto),
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_ => Err(())
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}
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}
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#[inline]
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pub fn to_f32(&self) -> Option<f32> {
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match *self {
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Zoom::Number(number) => Some(number as f32),
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Zoom::Percentage(percentage) => Some(percentage as f32),
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Zoom::Auto => None
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}
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}
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}
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