script/dom/css/
cssnesteddeclarations.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5use std::cell::RefCell;
6
7use dom_struct::dom_struct;
8use js::context::JSContext;
9use script_bindings::reflector::reflect_dom_object_with_cx;
10use servo_arc::Arc;
11use style::shared_lock::{Locked, SharedRwLockReadGuard, ToCssWithGuard};
12use style::stylesheets::{CssRuleType, NestedDeclarationsRule};
13
14use super::cssrule::{CSSRule, SpecificCSSRule};
15use super::cssstyledeclaration::{CSSModificationAccess, CSSStyleDeclaration, CSSStyleOwner};
16use super::cssstylesheet::CSSStyleSheet;
17use crate::dom::bindings::codegen::Bindings::CSSNestedDeclarationsBinding::CSSNestedDeclarationsMethods;
18use crate::dom::bindings::inheritance::Castable;
19use crate::dom::bindings::reflector::DomGlobal;
20use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
21use crate::dom::bindings::str::DOMString;
22use crate::dom::cssgroupingrule::CSSGroupingRule;
23use crate::dom::window::Window;
24
25#[dom_struct]
26pub(crate) struct CSSNestedDeclarations {
27    css_rule: CSSRule,
28    #[ignore_malloc_size_of = "Stylo"]
29    #[no_trace]
30    nesteddeclarationsrule: RefCell<Arc<Locked<NestedDeclarationsRule>>>,
31    style_declaration: MutNullableDom<CSSStyleDeclaration>,
32}
33
34impl CSSNestedDeclarations {
35    pub(crate) fn new_inherited(
36        parent_rule: Option<&CSSGroupingRule>,
37        parent_stylesheet: &CSSStyleSheet,
38        nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
39    ) -> Self {
40        Self {
41            css_rule: CSSRule::new_inherited(parent_rule, parent_stylesheet),
42            nesteddeclarationsrule: RefCell::new(nesteddeclarationsrule),
43            style_declaration: Default::default(),
44        }
45    }
46
47    pub(crate) fn new(
48        cx: &mut JSContext,
49        window: &Window,
50        parent_rule: Option<&CSSGroupingRule>,
51        parent_stylesheet: &CSSStyleSheet,
52        nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
53    ) -> DomRoot<Self> {
54        reflect_dom_object_with_cx(
55            Box::new(Self::new_inherited(
56                parent_rule,
57                parent_stylesheet,
58                nesteddeclarationsrule,
59            )),
60            window,
61            cx,
62        )
63    }
64
65    pub(crate) fn update_rule(
66        &self,
67        nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
68        guard: &SharedRwLockReadGuard,
69    ) {
70        if let Some(ref style_decl) = self.style_declaration.get() {
71            style_decl
72                .update_property_declaration_block(&nesteddeclarationsrule.read_with(guard).block);
73        }
74        *self.nesteddeclarationsrule.borrow_mut() = nesteddeclarationsrule;
75    }
76}
77
78impl SpecificCSSRule for CSSNestedDeclarations {
79    fn ty(&self) -> CssRuleType {
80        CssRuleType::NestedDeclarations
81    }
82
83    fn get_css(&self) -> DOMString {
84        let guard = self.css_rule.shared_lock().read();
85        self.nesteddeclarationsrule
86            .borrow()
87            .read_with(&guard)
88            .to_css_string(&guard)
89            .into()
90    }
91}
92
93impl CSSNestedDeclarationsMethods<crate::DomTypeHolder> for CSSNestedDeclarations {
94    /// <https://drafts.csswg.org/css-nesting/#dom-cssnesteddeclarations-style>
95    fn Style(&self, cx: &mut JSContext) -> DomRoot<CSSStyleDeclaration> {
96        self.style_declaration.or_init(|| {
97            let guard = self.css_rule.shared_lock().read();
98            CSSStyleDeclaration::new(
99                cx,
100                self.global().as_window(),
101                CSSStyleOwner::CSSRule(
102                    Dom::from_ref(self.upcast()),
103                    RefCell::new(
104                        self.nesteddeclarationsrule
105                            .borrow()
106                            .read_with(&guard)
107                            .block
108                            .clone(),
109                    ),
110                ),
111                None,
112                CSSModificationAccess::ReadWrite,
113            )
114        })
115    }
116}
script/dom/css/cssnesteddeclarations.rs

script/dom/css/
cssnesteddeclarations.rs
