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LibWeb: Fire MediaQueryListEvents when an MQL's match-state changes

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The HTML event loop does a check for MQL match-state changes and
dispatches the events. This requires us to keep a list of MQLs on the
Document.
This commit is contained in:
Sam Atkins 2021-10-04 17:41:35 +01:00 • committed by Andreas Kling
parent 1c829e0417
commit 050823bea7
10 changed files with 122 additions and 2 deletions
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40
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -2,6 +2,7 @@
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -15,6 +16,7 @@
#include <LibJS/Runtime/FunctionObject.h>
#include <LibWeb/Bindings/MainThreadVM.h>
#include <LibWeb/Bindings/WindowObject.h>
#include <LibWeb/CSS/MediaQueryListEvent.h>
#include <LibWeb/CSS/StyleComputer.h>
#include <LibWeb/Cookie/ParsedCookie.h>
#include <LibWeb/DOM/Comment.h>
@ -1105,4 +1107,42 @@ void Document::run_the_resize_steps()
update_layout();
}
void Document::add_media_query_list(NonnullRefPtr<CSS::MediaQueryList>& media_query_list)
{
m_media_query_lists.append(media_query_list);
}
// https://drafts.csswg.org/cssom-view/#evaluate-media-queries-and-report-changes
void Document::evaluate_media_queries_and_report_changes()
{
// NOTE: Not in the spec, but we take this opportunity to prune null WeakPtrs.
m_media_query_lists.remove_all_matching([](auto& it) {
return it.is_null();
});
// 1. For each MediaQueryList object target that has doc as its document,
// in the order they were created, oldest first, run these substeps:
for (auto& media_query_list_ptr : m_media_query_lists) {
// 1.1. If target’s matches state has changed since the last time these steps
// were run, fire an event at target using the MediaQueryListEvent constructor,
// with its type attribute initialized to change, its isTrusted attribute
// initialized to true, its media attribute initialized to target’s media,
// and its matches attribute initialized to target’s matches state.
if (media_query_list_ptr.is_null())
continue;
auto media_query_list = media_query_list_ptr.strong_ref();
bool did_match = media_query_list->matches();
bool now_matches = media_query_list->evaluate();
if (did_match != now_matches) {
CSS::MediaQueryListEventInit init;
init.media = media_query_list->media();
init.matches = now_matches;
auto event = CSS::MediaQueryListEvent::create(HTML::EventNames::change, init);
event->set_is_trusted(true);
media_query_list->dispatch_event(event);
}
}
}
}