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 servo_arc::Arc;
9use style::shared_lock::{Locked, SharedRwLockReadGuard, ToCssWithGuard};
10use style::stylesheets::{CssRuleType, NestedDeclarationsRule};
11
12use super::cssrule::{CSSRule, SpecificCSSRule};
13use super::cssstyledeclaration::{CSSModificationAccess, CSSStyleDeclaration, CSSStyleOwner};
14use super::cssstylesheet::CSSStyleSheet;
15use crate::dom::bindings::codegen::Bindings::CSSNestedDeclarationsBinding::CSSNestedDeclarationsMethods;
16use crate::dom::bindings::inheritance::Castable;
17use crate::dom::bindings::reflector::{DomGlobal, reflect_dom_object};
18use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
19use crate::dom::bindings::str::DOMString;
20use crate::dom::window::Window;
21use crate::script_runtime::CanGc;
22
23#[dom_struct]
24pub(crate) struct CSSNestedDeclarations {
25    cssrule: CSSRule,
26    #[ignore_malloc_size_of = "Stylo"]
27    #[no_trace]
28    nesteddeclarationsrule: RefCell<Arc<Locked<NestedDeclarationsRule>>>,
29    style_decl: MutNullableDom<CSSStyleDeclaration>,
30}
31
32impl CSSNestedDeclarations {
33    pub(crate) fn new_inherited(
34        parent_stylesheet: &CSSStyleSheet,
35        nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
36    ) -> Self {
37        Self {
38            cssrule: CSSRule::new_inherited(parent_stylesheet),
39            nesteddeclarationsrule: RefCell::new(nesteddeclarationsrule),
40            style_decl: Default::default(),
41        }
42    }
43
44    pub(crate) fn new(
45        window: &Window,
46        parent_stylesheet: &CSSStyleSheet,
47        nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
48        can_gc: CanGc,
49    ) -> DomRoot<Self> {
50        reflect_dom_object(
51            Box::new(Self::new_inherited(
52                parent_stylesheet,
53                nesteddeclarationsrule,
54            )),
55            window,
56            can_gc,
57        )
58    }
59
60    pub(crate) fn update_rule(
61        &self,
62        nesteddeclarationsrule: Arc<Locked<NestedDeclarationsRule>>,
63        guard: &SharedRwLockReadGuard,
64    ) {
65        if let Some(ref style_decl) = self.style_decl.get() {
66            style_decl
67                .update_property_declaration_block(&nesteddeclarationsrule.read_with(guard).block);
68        }
69        *self.nesteddeclarationsrule.borrow_mut() = nesteddeclarationsrule;
70    }
71}
72
73impl SpecificCSSRule for CSSNestedDeclarations {
74    fn ty(&self) -> CssRuleType {
75        CssRuleType::NestedDeclarations
76    }
77
78    fn get_css(&self) -> DOMString {
79        let guard = self.cssrule.shared_lock().read();
80        self.nesteddeclarationsrule
81            .borrow()
82            .read_with(&guard)
83            .to_css_string(&guard)
84            .into()
85    }
86}
87
88impl CSSNestedDeclarationsMethods<crate::DomTypeHolder> for CSSNestedDeclarations {
89    /// <https://drafts.csswg.org/css-nesting/#dom-cssnesteddeclarations-style>
90    fn Style(&self, can_gc: CanGc) -> DomRoot<CSSStyleDeclaration> {
91        self.style_decl.or_init(|| {
92            let guard = self.cssrule.shared_lock().read();
93            CSSStyleDeclaration::new(
94                self.global().as_window(),
95                CSSStyleOwner::CSSRule(
96                    Dom::from_ref(self.upcast()),
97                    RefCell::new(
98                        self.nesteddeclarationsrule
99                            .borrow()
100                            .read_with(&guard)
101                            .block
102                            .clone(),
103                    ),
104                ),
105                None,
106                CSSModificationAccess::ReadWrite,
107                can_gc,
108            )
109        })
110    }
111}
script/dom/css/cssnesteddeclarations.rs

script/dom/css/
cssnesteddeclarations.rs
