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