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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use dom::bindings::codegen::Bindings::CSSRuleBinding;
use dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleMethods;
use dom::bindings::inheritance::Castable;
use dom::bindings::js::{JS, MutNullableHeap, Root};
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use dom::bindings::str::DOMString;
use dom::cssfontfacerule::CSSFontFaceRule;
use dom::csskeyframesrule::CSSKeyframesRule;
use dom::csskeyframerule::CSSKeyframeRule;
use dom::cssmediarule::CSSMediaRule;
use dom::cssnamespacerule::CSSNamespaceRule;
use dom::cssstylerule::CSSStyleRule;
use dom::cssstylesheet::CSSStyleSheet;
use dom::cssviewportrule::CSSViewportRule;
use dom::window::Window;
use style::stylesheets::CssRule as StyleCssRule;
#[dom_struct]
pub struct CSSRule {
reflector_: Reflector,
parent: MutNullableHeap<JS<CSSStyleSheet>>,
}
impl CSSRule {
#[allow(unrooted_must_root)]
pub fn new_inherited(parent: Option<&CSSStyleSheet>) -> CSSRule {
CSSRule {
reflector_: Reflector::new(),
parent: MutNullableHeap::new(parent),
}
}
#[allow(unrooted_must_root)]
pub fn new(window: &Window, parent: Option<&CSSStyleSheet>) -> Root<CSSRule> {
reflect_dom_object(box CSSRule::new_inherited(parent),
window,
CSSRuleBinding::Wrap)
}
pub fn as_specific(&self) -> &SpecificCSSRule {
if let Some(rule) = self.downcast::<CSSStyleRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSFontFaceRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSKeyframesRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSMediaRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSNamespaceRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSViewportRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSKeyframeRule>() {
rule as &SpecificCSSRule
} else {
unreachable!()
}
}
// Given a StyleCssRule, create a new instance of a derived class of
// CSSRule based on which rule it is
pub fn new_specific(window: &Window, parent: Option<&CSSStyleSheet>,
rule: StyleCssRule) -> Root<CSSRule> {
// be sure to update the match in as_specific when this is updated
match rule {
StyleCssRule::Style(s) => Root::upcast(CSSStyleRule::new(window, parent, s)),
StyleCssRule::FontFace(s) => Root::upcast(CSSFontFaceRule::new(window, parent, s)),
StyleCssRule::Keyframes(s) => Root::upcast(CSSKeyframesRule::new(window, parent, s)),
StyleCssRule::Media(s) => Root::upcast(CSSMediaRule::new(window, parent, s)),
StyleCssRule::Namespace(s) => Root::upcast(CSSNamespaceRule::new(window, parent, s)),
StyleCssRule::Viewport(s) => Root::upcast(CSSViewportRule::new(window, parent, s)),
}
}
/// Sets owner sheet/rule to null
pub fn disown(&self) {
self.parent.set(None);
// should set parent rule to None when we add parent rule support
// Should we disown children as well? (https://github.com/w3c/csswg-drafts/issues/722)
}
}
impl CSSRuleMethods for CSSRule {
// https://drafts.csswg.org/cssom/#dom-cssrule-type
fn Type(&self) -> u16 {
self.as_specific().ty()
}
// https://drafts.csswg.org/cssom/#dom-cssrule-parentstylesheet
fn GetParentStyleSheet(&self) -> Option<Root<CSSStyleSheet>> {
self.parent.get()
}
// https://drafts.csswg.org/cssom/#dom-cssrule-csstext
fn CssText(&self) -> DOMString {
self.as_specific().get_css()
}
// https://drafts.csswg.org/cssom/#dom-cssrule-csstext
fn SetCssText(&self, _: DOMString) {
// do nothing
}
}
pub trait SpecificCSSRule {
fn ty(&self) -> u16;
fn get_css(&self) -> DOMString;
}
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