3e5476c9e0
A recently imported WPT test has a subtest that effectively does the
following:
const mql = window.matchMedia("");
mql.removeListener(null);
116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
/*
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/MediaQueryListPrototype.h>
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#include <LibWeb/CSS/MediaQueryList.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/EventDispatcher.h>
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#include <LibWeb/DOM/IDLEventListener.h>
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#include <LibWeb/HTML/EventHandler.h>
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namespace Web::CSS {
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JS_DEFINE_ALLOCATOR(MediaQueryList);
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JS::NonnullGCPtr<MediaQueryList> MediaQueryList::create(DOM::Document& document, Vector<NonnullRefPtr<MediaQuery>>&& media)
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{
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return document.heap().allocate<MediaQueryList>(document.realm(), document, move(media));
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}
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MediaQueryList::MediaQueryList(DOM::Document& document, Vector<NonnullRefPtr<MediaQuery>>&& media)
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: DOM::EventTarget(document.realm())
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, m_document(document)
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, m_media(move(media))
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{
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evaluate();
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}
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void MediaQueryList::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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WEB_SET_PROTOTYPE_FOR_INTERFACE(MediaQueryList);
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}
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void MediaQueryList::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_document);
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}
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// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-media
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String MediaQueryList::media() const
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{
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return serialize_a_media_query_list(m_media);
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}
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// https://drafts.csswg.org/cssom-view/#dom-mediaquerylist-matches
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bool MediaQueryList::matches() const
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{
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if (m_media.is_empty())
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return true;
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for (auto& media : m_media) {
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if (media->matches())
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return true;
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}
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return false;
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}
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bool MediaQueryList::evaluate()
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{
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auto window = m_document->window();
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if (!window)
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return false;
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if (m_media.is_empty())
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return true;
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bool now_matches = false;
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for (auto& media : m_media) {
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now_matches = now_matches || media->evaluate(*window);
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}
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return now_matches;
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}
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// https://www.w3.org/TR/cssom-view/#dom-mediaquerylist-addlistener
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void MediaQueryList::add_listener(JS::GCPtr<DOM::IDLEventListener> listener)
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{
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// 1. If listener is null, terminate these steps.
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if (!listener)
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return;
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// 2. Append an event listener to the associated list of event listeners with type set to change,
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// callback set to listener, and capture set to false, unless there already is an event listener
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// in that list with the same type, callback, and capture.
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// (NOTE: capture is set to false by default)
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add_event_listener_without_options(HTML::EventNames::change, *listener);
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}
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// https://www.w3.org/TR/cssom-view/#dom-mediaquerylist-removelistener
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void MediaQueryList::remove_listener(JS::GCPtr<DOM::IDLEventListener> listener)
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{
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// 1. Remove an event listener from the associated list of event listeners, whose type is change, callback is listener, and capture is false.
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// NOTE: While the spec doesn't technically use remove_event_listener and instead manipulates the list directly, every major engine uses remove_event_listener.
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// This means if an event listener removes another event listener that comes after it, the removed event listener will not be invoked.
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if (listener)
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remove_event_listener_without_options(HTML::EventNames::change, *listener);
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}
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void MediaQueryList::set_onchange(WebIDL::CallbackType* event_handler)
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{
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set_event_handler_attribute(HTML::EventNames::change, event_handler);
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}
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WebIDL::CallbackType* MediaQueryList::onchange()
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{
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return event_handler_attribute(HTML::EventNames::change);
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}
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}
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