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Support basic immutable CSSOM
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33 changed files with 861 additions and 43 deletions
103
components/script/dom/cssrule.rs
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103
components/script/dom/cssrule.rs
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/* 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::codegen::Bindings::CSSRuleBinding;
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use dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleMethods;
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use dom::bindings::inheritance::Castable;
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use dom::bindings::js::{JS, MutNullableHeap, Root};
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use dom::bindings::reflector::{Reflector, reflect_dom_object};
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use dom::bindings::str::DOMString;
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use dom::cssfontfacerule::CSSFontFaceRule;
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use dom::csskeyframesrule::CSSKeyframesRule;
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use dom::cssmediarule::CSSMediaRule;
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use dom::cssnamespacerule::CSSNamespaceRule;
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use dom::cssstylerule::CSSStyleRule;
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use dom::cssstylesheet::CSSStyleSheet;
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use dom::cssviewportrule::CSSViewportRule;
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use dom::window::Window;
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use style::stylesheets::CssRule as StyleCssRule;
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#[dom_struct]
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pub struct CSSRule {
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reflector_: Reflector,
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parent: MutNullableHeap<JS<CSSStyleSheet>>,
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}
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impl CSSRule {
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#[allow(unrooted_must_root)]
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pub fn new_inherited(parent: &CSSStyleSheet) -> CSSRule {
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CSSRule {
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reflector_: Reflector::new(),
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parent: MutNullableHeap::new(Some(parent)),
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}
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}
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#[allow(unrooted_must_root)]
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pub fn new(window: &Window, parent: &CSSStyleSheet) -> Root<CSSRule> {
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reflect_dom_object(box CSSRule::new_inherited(parent),
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window,
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CSSRuleBinding::Wrap)
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}
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pub fn as_specific(&self) -> &SpecificCSSRule {
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if let Some(rule) = self.downcast::<CSSStyleRule>() {
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rule as &SpecificCSSRule
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} else if let Some(rule) = self.downcast::<CSSFontFaceRule>() {
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rule as &SpecificCSSRule
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} else if let Some(rule) = self.downcast::<CSSKeyframesRule>() {
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rule as &SpecificCSSRule
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} else if let Some(rule) = self.downcast::<CSSMediaRule>() {
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rule as &SpecificCSSRule
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} else if let Some(rule) = self.downcast::<CSSNamespaceRule>() {
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rule as &SpecificCSSRule
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} else if let Some(rule) = self.downcast::<CSSViewportRule>() {
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rule as &SpecificCSSRule
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} else {
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unreachable!()
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}
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}
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// Given a StyleCssRule, create a new instance of a derived class of
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// CSSRule based on which rule it is
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pub fn new_specific(window: &Window, parent: &CSSStyleSheet,
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rule: StyleCssRule) -> Root<CSSRule> {
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// be sure to update the match in as_specific when this is updated
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match rule {
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StyleCssRule::Style(s) => Root::upcast(CSSStyleRule::new(window, parent, s)),
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StyleCssRule::FontFace(s) => Root::upcast(CSSFontFaceRule::new(window, parent, s)),
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StyleCssRule::Keyframes(s) => Root::upcast(CSSKeyframesRule::new(window, parent, s)),
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StyleCssRule::Media(s) => Root::upcast(CSSMediaRule::new(window, parent, s)),
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StyleCssRule::Namespace(s) => Root::upcast(CSSNamespaceRule::new(window, parent, s)),
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StyleCssRule::Viewport(s) => Root::upcast(CSSViewportRule::new(window, parent, s)),
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}
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}
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}
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impl CSSRuleMethods for CSSRule {
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// https://drafts.csswg.org/cssom/#dom-cssrule-type
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fn Type(&self) -> u16 {
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self.as_specific().ty()
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}
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// https://drafts.csswg.org/cssom/#dom-cssrule-parentstylesheet
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fn GetParentStyleSheet(&self) -> Option<Root<CSSStyleSheet>> {
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self.parent.get()
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}
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// https://drafts.csswg.org/cssom/#dom-cssrule-csstext
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fn CssText(&self) -> DOMString {
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self.as_specific().get_css()
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}
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// https://drafts.csswg.org/cssom/#dom-cssrule-csstext
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fn SetCssText(&self, _: DOMString) {
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// do nothing
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}
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}
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pub trait SpecificCSSRule {
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fn ty(&self) -> u16;
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fn get_css(&self) -> DOMString;
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}
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