blob: 1d7ba8927da79bcc91c88fd2b951e470cfb59270 [file] [log] [blame]
/*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "core/css/MediaQueryList.h"
#include "core/css/MediaList.h"
#include "core/css/MediaQueryEvaluator.h"
#include "core/css/MediaQueryListListener.h"
#include "core/css/MediaQueryMatcher.h"
#include "core/dom/Document.h"
namespace blink {
MediaQueryList* MediaQueryList::Create(ExecutionContext* context,
MediaQueryMatcher* matcher,
scoped_refptr<MediaQuerySet> media) {
return new MediaQueryList(context, matcher,
scoped_refptr<MediaQuerySet>(media));
}
MediaQueryList::MediaQueryList(ExecutionContext* context,
MediaQueryMatcher* matcher,
scoped_refptr<MediaQuerySet> media)
: ContextLifecycleObserver(context),
matcher_(matcher),
media_(media),
matches_dirty_(true),
matches_(false) {
matcher_->AddMediaQueryList(this);
UpdateMatches();
}
MediaQueryList::~MediaQueryList() = default;
String MediaQueryList::media() const {
return media_->MediaText();
}
void MediaQueryList::addDeprecatedListener(EventListener* listener) {
if (!listener)
return;
addEventListener(EventTypeNames::change, listener, false);
}
void MediaQueryList::removeDeprecatedListener(EventListener* listener) {
if (!listener)
return;
removeEventListener(EventTypeNames::change, listener, false);
}
void MediaQueryList::AddListener(MediaQueryListListener* listener) {
if (!listener)
return;
listeners_.insert(listener);
}
void MediaQueryList::RemoveListener(MediaQueryListListener* listener) {
if (!listener)
return;
listeners_.erase(listener);
}
bool MediaQueryList::HasPendingActivity() const {
return GetExecutionContext() &&
(listeners_.size() || HasEventListeners(EventTypeNames::change));
}
void MediaQueryList::ContextDestroyed(ExecutionContext*) {
listeners_.clear();
RemoveAllEventListeners();
}
bool MediaQueryList::MediaFeaturesChanged(
HeapVector<Member<MediaQueryListListener>>* listeners_to_notify) {
matches_dirty_ = true;
if (!UpdateMatches())
return false;
for (const auto& listener : listeners_) {
listeners_to_notify->push_back(listener);
}
return HasEventListeners(EventTypeNames::change);
}
bool MediaQueryList::UpdateMatches() {
matches_dirty_ = false;
if (matches_ != matcher_->Evaluate(media_.get())) {
matches_ = !matches_;
return true;
}
return false;
}
bool MediaQueryList::matches() {
UpdateMatches();
return matches_;
}
void MediaQueryList::Trace(blink::Visitor* visitor) {
visitor->Trace(matcher_);
visitor->Trace(listeners_);
EventTargetWithInlineData::Trace(visitor);
ContextLifecycleObserver::Trace(visitor);
}
const AtomicString& MediaQueryList::InterfaceName() const {
return EventTargetNames::MediaQueryList;
}
ExecutionContext* MediaQueryList::GetExecutionContext() const {
return ContextLifecycleObserver::GetExecutionContext();
}
} // namespace blink