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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 https://mozilla.org/MPL/2.0/. */
use std::cell::Cell;
use std::rc::Rc;
use dom_struct::dom_struct;
use style::media_queries::MediaList;
use style_traits::ToCss;
use crate::dom::bindings::codegen::Bindings::EventListenerBinding::EventListener;
use crate::dom::bindings::codegen::Bindings::EventTargetBinding::{
AddEventListenerOptions, EventListenerOptions,
};
use crate::dom::bindings::codegen::Bindings::MediaQueryListBinding::MediaQueryListMethods;
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::reflector::reflect_dom_object;
use crate::dom::bindings::root::{Dom, DomRoot};
use crate::dom::bindings::str::DOMString;
use crate::dom::document::Document;
use crate::dom::eventtarget::EventTarget;
use crate::script_runtime::CanGc;
pub(crate) enum MediaQueryListMatchState {
Same,
Changed,
}
#[dom_struct]
pub(crate) struct MediaQueryList {
eventtarget: EventTarget,
document: Dom<Document>,
#[no_trace]
media_query_list: MediaList,
last_match_state: Cell<Option<bool>>,
}
impl MediaQueryList {
fn new_inherited(document: &Document, media_query_list: MediaList) -> MediaQueryList {
MediaQueryList {
eventtarget: EventTarget::new_inherited(),
document: Dom::from_ref(document),
media_query_list,
last_match_state: Cell::new(None),
}
}
pub(crate) fn new(
document: &Document,
media_query_list: MediaList,
can_gc: CanGc,
) -> DomRoot<MediaQueryList> {
reflect_dom_object(
Box::new(MediaQueryList::new_inherited(document, media_query_list)),
document.window(),
can_gc,
)
}
}
impl MediaQueryList {
pub(crate) fn evaluate_changes(&self) -> MediaQueryListMatchState {
let matches = self.evaluate();
let result = if let Some(old_matches) = self.last_match_state.get() {
if old_matches == matches {
MediaQueryListMatchState::Same
} else {
MediaQueryListMatchState::Changed
}
} else {
MediaQueryListMatchState::Changed
};
self.last_match_state.set(Some(matches));
result
}
pub(crate) fn evaluate(&self) -> bool {
let quirks_mode = self.document.quirks_mode();
self.media_query_list
.evaluate(self.document.window().layout().device(), quirks_mode)
}
}
impl MediaQueryListMethods<crate::DomTypeHolder> for MediaQueryList {
// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-media
fn Media(&self) -> DOMString {
self.media_query_list.to_css_string().into()
}
// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-matches
fn Matches(&self) -> bool {
match self.last_match_state.get() {
None => self.evaluate(),
Some(state) => state,
}
}
// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-addlistener
fn AddListener(&self, listener: Option<Rc<EventListener>>) {
self.upcast::<EventTarget>().add_event_listener(
DOMString::from_string("change".to_owned()),
listener,
AddEventListenerOptions {
parent: EventListenerOptions { capture: false },
once: false,
passive: None,
},
);
}
// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-removelistener
fn RemoveListener(&self, listener: Option<Rc<EventListener>>) {
self.upcast::<EventTarget>().remove_event_listener(
DOMString::from_string("change".to_owned()),
listener,
EventListenerOptions { capture: false },
);
}
// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-onchange
event_handler!(change, GetOnchange, SetOnchange);
}
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