script/dom/
mediaquerylist.rs1use 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 fn Media(&self) -> DOMString {
90 self.media_query_list.to_css_string().into()
91 }
92
93 fn Matches(&self) -> bool {
95 match self.last_match_state.get() {
96 None => self.evaluate(),
97 Some(state) => state,
98 }
99 }
100
101 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 },
111 );
112 }
113
114 fn RemoveListener(&self, listener: Option<Rc<EventListener>>) {
116 self.upcast::<EventTarget>().remove_event_listener(
117 DOMString::from_string("change".to_owned()),
118 listener,
119 EventListenerOptions { capture: false },
120 );
121 }
122
123 event_handler!(change, GetOnchange, SetOnchange);
125}