script/dom/media/
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::stylesheets::CustomMediaEvaluator;
11use style_traits::ToCss;
12
13use crate::dom::bindings::codegen::Bindings::EventListenerBinding::EventListener;
14use crate::dom::bindings::codegen::Bindings::EventTargetBinding::{
15    AddEventListenerOptions, EventListenerOptions,
16};
17use crate::dom::bindings::codegen::Bindings::MediaQueryListBinding::MediaQueryListMethods;
18use crate::dom::bindings::inheritance::Castable;
19use crate::dom::bindings::reflector::reflect_dom_object;
20use crate::dom::bindings::root::{Dom, DomRoot};
21use crate::dom::bindings::str::DOMString;
22use crate::dom::document::Document;
23use crate::dom::eventtarget::EventTarget;
24use crate::script_runtime::CanGc;
25
26pub(crate) enum MediaQueryListMatchState {
27    Same,
28    Changed,
29}
30
31#[dom_struct]
32pub(crate) struct MediaQueryList {
33    eventtarget: EventTarget,
34    document: Dom<Document>,
35    #[no_trace]
36    media_query_list: MediaList,
37    last_match_state: Cell<Option<bool>>,
38}
39
40impl MediaQueryList {
41    fn new_inherited(document: &Document, media_query_list: MediaList) -> MediaQueryList {
42        MediaQueryList {
43            eventtarget: EventTarget::new_inherited(),
44            document: Dom::from_ref(document),
45            media_query_list,
46            last_match_state: Cell::new(None),
47        }
48    }
49
50    pub(crate) fn new(
51        document: &Document,
52        media_query_list: MediaList,
53        can_gc: CanGc,
54    ) -> DomRoot<MediaQueryList> {
55        reflect_dom_object(
56            Box::new(MediaQueryList::new_inherited(document, media_query_list)),
57            document.window(),
58            can_gc,
59        )
60    }
61}
62
63impl MediaQueryList {
64    pub(crate) fn evaluate_changes(&self) -> MediaQueryListMatchState {
65        let matches = self.evaluate();
66
67        let result = if let Some(old_matches) = self.last_match_state.get() {
68            if old_matches == matches {
69                MediaQueryListMatchState::Same
70            } else {
71                MediaQueryListMatchState::Changed
72            }
73        } else {
74            MediaQueryListMatchState::Changed
75        };
76
77        self.last_match_state.set(Some(matches));
78        result
79    }
80
81    pub(crate) fn evaluate(&self) -> bool {
82        let quirks_mode = self.document.quirks_mode();
83        self.media_query_list.evaluate(
84            self.document.window().layout().device(),
85            quirks_mode,
86            &mut CustomMediaEvaluator::none(),
87        )
88    }
89}
90
91impl MediaQueryListMethods<crate::DomTypeHolder> for MediaQueryList {
92    /// <https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-media>
93    fn Media(&self) -> DOMString {
94        self.media_query_list.to_css_string().into()
95    }
96
97    /// <https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-matches>
98    fn Matches(&self) -> bool {
99        match self.last_match_state.get() {
100            None => self.evaluate(),
101            Some(state) => state,
102        }
103    }
104
105    /// <https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-addlistener>
106    fn AddListener(&self, listener: Option<Rc<EventListener>>) {
107        self.upcast::<EventTarget>().add_event_listener(
108            DOMString::from_string("change".to_owned()),
109            listener,
110            AddEventListenerOptions {
111                parent: EventListenerOptions { capture: false },
112                once: false,
113                passive: None,
114                signal: None,
115            },
116        );
117    }
118
119    /// <https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-removelistener>
120    fn RemoveListener(&self, listener: Option<Rc<EventListener>>) {
121        self.upcast::<EventTarget>().remove_event_listener(
122            DOMString::from_string("change".to_owned()),
123            &listener,
124            &EventListenerOptions { capture: false },
125        );
126    }
127
128    // https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-onchange
129    event_handler!(change, GetOnchange, SetOnchange);
130}
script/dom/media/mediaquerylist.rs

script/dom/media/
mediaquerylist.rs
