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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.
109 lines
3.7 KiB
Rust
109 lines
3.7 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 dom::bindings::cell::DOMRefCell;
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use dom::bindings::codegen::Bindings::HTMLMetaElementBinding;
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use dom::bindings::codegen::Bindings::HTMLMetaElementBinding::HTMLMetaElementMethods;
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use dom::bindings::inheritance::Castable;
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use dom::bindings::js::{Root, RootedReference};
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use dom::document::Document;
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use dom::element::Element;
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use dom::htmlelement::HTMLElement;
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use dom::node::{Node, document_from_node};
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use dom::virtualmethods::VirtualMethods;
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use std::ascii::AsciiExt;
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use std::sync::Arc;
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use style::stylesheets::{CSSRule, Origin, Stylesheet};
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use style::viewport::ViewportRule;
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use util::str::{DOMString, HTML_SPACE_CHARACTERS};
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#[dom_struct]
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pub struct HTMLMetaElement {
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htmlelement: HTMLElement,
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stylesheet: DOMRefCell<Option<Arc<Stylesheet>>>,
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}
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impl HTMLMetaElement {
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fn new_inherited(localName: DOMString,
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prefix: Option<DOMString>,
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document: &Document) -> HTMLMetaElement {
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HTMLMetaElement {
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htmlelement: HTMLElement::new_inherited(localName, prefix, document),
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stylesheet: DOMRefCell::new(None),
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}
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}
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#[allow(unrooted_must_root)]
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pub fn new(localName: DOMString,
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prefix: Option<DOMString>,
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document: &Document) -> Root<HTMLMetaElement> {
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let element = HTMLMetaElement::new_inherited(localName, prefix, document);
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Node::reflect_node(box element, document, HTMLMetaElementBinding::Wrap)
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}
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pub fn get_stylesheet(&self) -> Option<Arc<Stylesheet>> {
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self.stylesheet.borrow().clone()
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}
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fn process_attributes(&self) {
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let element = self.upcast::<Element>();
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if let Some(name) = element.get_attribute(&ns!(""), &atom!("name")).r() {
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let name = name.value().to_ascii_lowercase();
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let name = name.trim_matches(HTML_SPACE_CHARACTERS);
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match name {
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"viewport" => self.apply_viewport(),
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_ => {}
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}
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}
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}
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fn apply_viewport(&self) {
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let element = self.upcast::<Element>();
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if let Some(content) = element.get_attribute(&ns!(""), &atom!("content")).r() {
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let content = content.value();
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if !content.is_empty() {
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if let Some(translated_rule) = ViewportRule::from_meta(&**content) {
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*self.stylesheet.borrow_mut() = Some(Arc::new(Stylesheet {
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rules: vec![CSSRule::Viewport(translated_rule)],
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origin: Origin::Author,
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media: None,
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}));
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let doc = document_from_node(self);
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doc.invalidate_stylesheets();
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}
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}
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}
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}
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}
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impl HTMLMetaElementMethods for HTMLMetaElement {
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// https://html.spec.whatwg.org/multipage/#dom-meta-name
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make_getter!(Name, "name");
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// https://html.spec.whatwg.org/multipage/#dom-meta-name
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make_setter!(SetName, "name");
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// https://html.spec.whatwg.org/multipage/#dom-meta-content
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make_getter!(Content, "content");
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// https://html.spec.whatwg.org/multipage/#dom-meta-content
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make_setter!(SetContent, "content");
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}
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impl VirtualMethods for HTMLMetaElement {
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fn super_type(&self) -> Option<&VirtualMethods> {
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Some(self.upcast::<HTMLElement>() as &VirtualMethods)
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}
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fn bind_to_tree(&self, tree_in_doc: bool) {
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if let Some(ref s) = self.super_type() {
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s.bind_to_tree(tree_in_doc);
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}
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if tree_in_doc {
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self.process_attributes();
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}
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}
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}
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