servo/components/script/dom/fontfaceset.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 std::rc::Rc;

use dom_struct::dom_struct;
use js::rust::HandleObject;

use crate::dom::bindings::codegen::Bindings::FontFaceSetBinding::FontFaceSetMethods;
use crate::dom::bindings::reflector::reflect_dom_object_with_proto;
use crate::dom::bindings::root::DomRoot;
use crate::dom::eventtarget::EventTarget;
use crate::dom::globalscope::GlobalScope;
use crate::dom::promise::Promise;
use crate::realms::enter_realm;
use crate::script_runtime::CanGc;

#[dom_struct]
pub(crate) struct FontFaceSet {
    target: EventTarget,
    #[ignore_malloc_size_of = "Rc"]
    promise: Rc<Promise>,
}

impl FontFaceSet {
    pub(crate) fn new_inherited(global: &GlobalScope, can_gc: CanGc) -> Self {
        FontFaceSet {
            target: EventTarget::new_inherited(),
            promise: Promise::new(global, can_gc),
        }
    }

    pub(crate) fn new(
        global: &GlobalScope,
        proto: Option<HandleObject>,
        can_gc: CanGc,
    ) -> DomRoot<Self> {
        reflect_dom_object_with_proto(
            Box::new(FontFaceSet::new_inherited(global, can_gc)),
            global,
            proto,
            can_gc,
        )
    }

    pub(crate) fn fulfill_ready_promise_if_needed(&self) {
        if !self.promise.is_fulfilled() {
            let _ac = enter_realm(&*self.promise);
            self.promise.resolve_native(self);
        }
    }
}

impl FontFaceSetMethods<crate::DomTypeHolder> for FontFaceSet {
    /// <https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-ready>
    fn Ready(&self) -> Rc<Promise> {
        self.promise.clone()
    }
}