servo/components/script/dom/svgelement.rs

/* 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 https://mozilla.org/MPL/2.0/. */

use crate::dom::bindings::codegen::Bindings::SVGElementBinding::SVGElementMethods;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::root::{Dom, DomRoot, MutNullableDom};
use crate::dom::cssstyledeclaration::{CSSModificationAccess, CSSStyleDeclaration, CSSStyleOwner};
use crate::dom::document::Document;
use crate::dom::element::Element;
use crate::dom::node::window_from_node;
use crate::dom::node::Node;
use crate::dom::virtualmethods::VirtualMethods;
use dom_struct::dom_struct;
use html5ever::{LocalName, Prefix};
use style::element_state::ElementState;

#[dom_struct]
pub struct SVGElement {
    element: Element,
    style_decl: MutNullableDom<CSSStyleDeclaration>,
}

impl SVGElement {
    fn new_inherited(
        tag_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
    ) -> SVGElement {
        SVGElement::new_inherited_with_state(ElementState::empty(), tag_name, prefix, document)
    }

    pub fn new_inherited_with_state(
        state: ElementState,
        tag_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
    ) -> SVGElement {
        SVGElement {
            element: Element::new_inherited_with_state(state, tag_name, ns!(svg), prefix, document),
            style_decl: Default::default(),
        }
    }

    pub fn new(
        tag_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
    ) -> DomRoot<SVGElement> {
        Node::reflect_node(
            Box::new(SVGElement::new_inherited(tag_name, prefix, document)),
            document,
        )
    }
}

impl VirtualMethods for SVGElement {
    fn super_type(&self) -> Option<&dyn VirtualMethods> {
        Some(self.upcast::<Element>() as &dyn VirtualMethods)
    }
}

impl SVGElementMethods for SVGElement {
    // https://html.spec.whatwg.org/multipage/#the-style-attribute
    fn Style(&self) -> DomRoot<CSSStyleDeclaration> {
        self.style_decl.or_init(|| {
            let global = window_from_node(self);
            CSSStyleDeclaration::new(
                &global,
                CSSStyleOwner::Element(Dom::from_ref(self.upcast())),
                None,
                CSSModificationAccess::ReadWrite,
            )
        })
    }
}