script/dom/
mediaquerylist.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::Cell;
6use std::rc::Rc;
7
8use dom_struct::dom_struct;
9use style::media_queries::MediaList;
10use style_traits::ToCss;
11
12use crate::dom::bindings::codegen::Bindings::EventListenerBinding::EventListener;
13use crate::dom::bindings::codegen::Bindings::EventTargetBinding::{
14    AddEventListenerOptions, EventListenerOptions,
15};
16use crate::dom::bindings::codegen::Bindings::MediaQueryListBinding::MediaQueryListMethods;
17use crate::dom::bindings::inheritance::Castable;
18use crate::dom::bindings::reflector::reflect_dom_object;
19use crate::dom::bindings::root::{Dom, DomRoot};
20use crate::dom::bindings::str::DOMString;
21use crate::dom::document::Document;
22use crate::dom::eventtarget::EventTarget;
23use crate::script_runtime::CanGc;
24
25pub(crate) enum MediaQueryListMatchState {
26    Same,
27    Changed,
28}
29
30#[dom_struct]
31pub(crate) struct MediaQueryList {
32    eventtarget: EventTarget,
33    document: Dom<Document>,
34    #[no_trace]
35    media_query_list: MediaList,
36    last_match_state: Cell<Option<bool>>,
37}
38
39impl MediaQueryList {
40    fn new_inherited(document: &Document, media_query_list: MediaList) -> MediaQueryList {
41        MediaQueryList {
42            eventtarget: EventTarget::new_inherited(),
43            document: Dom::from_ref(document),
44            media_query_list,
45            last_match_state: Cell::new(None),
46        }
47    }
48
49    pub(crate) fn new(
50        document: &Document,
51        media_query_list: MediaList,
52        can_gc: CanGc,
53    ) -> DomRoot<MediaQueryList> {
54        reflect_dom_object(
55            Box::new(MediaQueryList::new_inherited(document, media_query_list)),
56            document.window(),
57            can_gc,
58        )
59    }
60}
61
62impl MediaQueryList {
63    pub(crate) fn evaluate_changes(&self) -> MediaQueryListMatchState {
64        let matches = self.evaluate();
65
66        let result = if let Some(old_matches) = self.last_match_state.get() {
67            if old_matches == matches {
68                MediaQueryListMatchState::Same
69            } else {
70                MediaQueryListMatchState::Changed
71            }
72        } else {
73            MediaQueryListMatchState::Changed
74        };
75
76        self.last_match_state.set(Some(matches));
77        result
78    }
79
80    pub(crate) fn evaluate(&self) -> bool {
81        let quirks_mode = self.document.quirks_mode();
82        self.media_query_list
83            .evaluate(self.document.window().layout().device(), quirks_mode)
84    }
85}
86
87impl MediaQueryListMethods<crate::DomTypeHolder> for MediaQueryList {
88    // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-media
89    fn Media(&self) -> DOMString {
90        self.media_query_list.to_css_string().into()
91    }
92
93    // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-matches
94    fn Matches(&self) -> bool {
95        match self.last_match_state.get() {
96            None => self.evaluate(),
97            Some(state) => state,
98        }
99    }
100
101    // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-addlistener
102    fn AddListener(&self, listener: Option<Rc<EventListener>>) {
103        self.upcast::<EventTarget>().add_event_listener(
104            DOMString::from_string("change".to_owned()),
105            listener,
106            AddEventListenerOptions {
107                parent: EventListenerOptions { capture: false },
108                once: false,
109                passive: None,
110                signal: None,
111            },
112        );
113    }
114
115    // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-removelistener
116    fn RemoveListener(&self, listener: Option<Rc<EventListener>>) {
117        self.upcast::<EventTarget>().remove_event_listener(
118            DOMString::from_string("change".to_owned()),
119            &listener,
120            &EventListenerOptions { capture: false },
121        );
122    }
123
124    // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-onchange
125    event_handler!(change, GetOnchange, SetOnchange);
126}
script/dom/mediaquerylist.rs

script/dom/
mediaquerylist.rs
