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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 http://mozilla.org/MPL/2.0/. */
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::EventHandlerBinding::EventHandlerNonNull;
use dom::bindings::codegen::Bindings::EventListenerBinding::EventListener;
use dom::bindings::codegen::Bindings::EventTargetBinding::EventTargetMethods;
use dom::bindings::codegen::Bindings::MediaQueryListBinding::{self, MediaQueryListMethods};
use dom::bindings::inheritance::Castable;
use dom::bindings::js::{JS, Root};
use dom::bindings::reflector::DomObject;
use dom::bindings::reflector::reflect_dom_object;
use dom::bindings::str::DOMString;
use dom::bindings::trace::JSTraceable;
use dom::bindings::weakref::{WeakRef, WeakRefVec};
use dom::document::Document;
use dom::event::Event;
use dom::eventtarget::EventTarget;
use dom::mediaquerylistevent::MediaQueryListEvent;
use euclid::scale_factor::ScaleFactor;
use js::jsapi::JSTracer;
use std::cell::Cell;
use std::rc::Rc;
use style::media_queries::{Device, MediaList, MediaType};
use style_traits::{PagePx, ToCss, ViewportPx};
pub enum MediaQueryListMatchState {
Same(bool),
Changed(bool),
}
#[dom_struct]
pub struct MediaQueryList {
eventtarget: EventTarget,
document: JS<Document>,
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: JS::from_ref(document),
media_query_list: media_query_list,
last_match_state: Cell::new(None),
}
}
pub fn new(document: &Document, media_query_list: MediaList) -> Root<MediaQueryList> {
reflect_dom_object(box MediaQueryList::new_inherited(document, media_query_list),
document.window(),
MediaQueryListBinding::Wrap)
}
}
impl MediaQueryList {
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(matches)
} else {
MediaQueryListMatchState::Changed(matches)
}
} else {
MediaQueryListMatchState::Changed(matches)
};
self.last_match_state.set(Some(matches));
result
}
pub fn evaluate(&self) -> bool {
if let Some(window_size) = self.document.window().window_size() {
let viewport_size = window_size.visible_viewport;
// TODO: support real ViewportPx, including zoom level
// This information seems not to be tracked currently, so we assume
// ViewportPx == PagePx
let page_to_viewport: ScaleFactor<f32, PagePx, ViewportPx> = ScaleFactor::new(1.0);
let device = Device::new(MediaType::Screen, viewport_size * page_to_viewport);
self.media_query_list.evaluate(&device)
} else {
false
}
}
}
impl MediaQueryListMethods for MediaQueryList {
// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-media
fn Media(&self) -> DOMString {
let mut s = String::new();
self.media_query_list.to_css(&mut s).unwrap();
DOMString::from_string(s)
}
// 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>().AddEventListener(DOMString::from_string("change".to_owned()),
listener, false);
}
// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-removelistener
fn RemoveListener(&self, listener: Option<Rc<EventListener>>) {
self.upcast::<EventTarget>().RemoveEventListener(DOMString::from_string("change".to_owned()),
listener, false);
}
// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-onchange
event_handler!(change, GetOnchange, SetOnchange);
}
#[derive(HeapSizeOf)]
pub struct WeakMediaQueryListVec {
cell: DOMRefCell<WeakRefVec<MediaQueryList>>,
}
impl WeakMediaQueryListVec {
/// Create a new vector of weak references to MediaQueryList
pub fn new() -> Self {
WeakMediaQueryListVec { cell: DOMRefCell::new(WeakRefVec::new()) }
}
pub fn push(&self, mql: &MediaQueryList) {
self.cell.borrow_mut().push(WeakRef::new(mql));
}
/// Evaluate media query lists and report changes
/// https://drafts.csswg.org/cssom-view/#evaluate-media-queries-and-report-changes
pub fn evaluate_and_report_changes(&self) {
self.cell.borrow_mut().update(|mql| {
let mql = mql.root().unwrap();
if let MediaQueryListMatchState::Changed(_) = mql.evaluate_changes() {
let event = MediaQueryListEvent::new(&mql.global(),
atom!("change"),
false, false,
mql.Media(),
mql.Matches());
event.upcast::<Event>().fire(mql.upcast::<EventTarget>());
}
});
}
}
#[allow(unsafe_code)]
unsafe impl JSTraceable for WeakMediaQueryListVec {
unsafe fn trace(&self, _: *mut JSTracer) {
self.cell.borrow_mut().retain_alive()
}
}
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