3479f1c4e8
This also adds a variant of {add,remove}_event_listener called
{add,remove}_event_listener_with_options.
This is used internally to perform {add,remove}_event_listener with a
default constructed options struct. It was done like this because
default constructing the Variant with the options struct requires the
struct defintions to be present, which requires us to include
AbortSignal.h, which would cause a circular include as AbortSignal.h
includes EventTarget.h.
96 lines
3 KiB
C++
96 lines
3 KiB
C++
/*
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* Copyright (c) 2021, 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/MediaQueryListWrapper.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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MediaQueryList::MediaQueryList(DOM::Document& document, NonnullRefPtrVector<MediaQuery>&& media)
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: DOM::EventTarget()
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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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MediaQueryList::~MediaQueryList()
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{
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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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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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if (!m_document)
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return false;
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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(m_document->window());
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}
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return now_matches;
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}
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JS::Object* MediaQueryList::create_wrapper(JS::GlobalObject& global_object)
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{
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return wrap(global_object, *this);
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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(RefPtr<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(RefPtr<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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remove_event_listener_without_options(HTML::EventNames::change, listener);
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}
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void MediaQueryList::set_onchange(Optional<Bindings::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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Bindings::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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