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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* implements DOM interface for querying and observing media queries */
#include "mozilla/dom/MediaQueryList.h"
#include "mozilla/dom/MediaQueryListEvent.h"
#include "mozilla/dom/MediaList.h"
#include "mozilla/dom/EventTarget.h"
#include "mozilla/dom/EventTargetBinding.h"
#include "nsPresContext.h"
#include "mozilla/dom/Document.h"
namespace mozilla::dom {
MediaQueryList::MediaQueryList(Document* aDocument,
const nsACString& aMediaQueryList,
CallerType aCallerType)
: DOMEventTargetHelper(aDocument->GetInnerWindow()),
mDocument(aDocument),
mMediaList(MediaList::Create(aMediaQueryList, aCallerType)),
mViewportDependent(mMediaList->IsViewportDependent()),
mMatches(mMediaList->Matches(*aDocument)),
mMatchesOnRenderingUpdate(mMatches) {
KeepAliveIfHasListenersFor(nsGkAtoms::onchange);
}
MediaQueryList::~MediaQueryList() = default;
NS_IMPL_CYCLE_COLLECTION_CLASS(MediaQueryList)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(MediaQueryList,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(MediaQueryList,
DOMEventTargetHelper)
if (tmp->mDocument) {
static_cast<LinkedListElement<MediaQueryList>*>(tmp)->remove();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
}
tmp->Disconnect();
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaQueryList)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(MediaQueryList, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(MediaQueryList, DOMEventTargetHelper)
void MediaQueryList::GetMedia(nsACString& aMedia) const {
mMediaList->GetText(aMedia);
}
bool MediaQueryList::Matches() {
if (mViewportDependent &&
mDocument->StyleOrLayoutObservablyDependsOnParentDocumentLayout()) {
RefPtr<Document> doc = mDocument;
// This is enough to trigger media query updates in the current doc, and
// will flush the parent document layout if appropriate.
doc->FlushPendingNotifications(FlushType::Layout);
}
return mMatches;
}
void MediaQueryList::AddListener(EventListener* aListener) {
if (!aListener) {
return;
}
AddEventListenerOptionsOrBoolean options;
options.SetAsBoolean() = false;
AddEventListener(u"change"_ns, aListener, options, Nullable<bool>());
}
void MediaQueryList::RemoveListener(EventListener* aListener) {
if (!aListener) {
return;
}
EventListenerOptionsOrBoolean options;
options.SetAsBoolean() = false;
RemoveEventListener(u"change"_ns, aListener, options);
}
bool MediaQueryList::HasListeners() const {
return HasListenersFor(nsGkAtoms::onchange);
}
void MediaQueryList::Disconnect() {
DisconnectFromOwner();
IgnoreKeepAliveIfHasListenersFor(nsGkAtoms::onchange);
}
nsISupports* MediaQueryList::GetParentObject() const {
return ToSupports(mDocument);
}
JSObject* MediaQueryList::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MediaQueryList_Binding::Wrap(aCx, this, aGivenProto);
}
void MediaQueryList::MediaFeatureValuesChanged() {
mMatches = mDocument && mMediaList->Matches(*mDocument);
// Note that mMatchesOnRenderingUpdate remains with the old value here.
// That gets updated in EvaluateOnRenderingUpdate().
}
bool MediaQueryList::EvaluateOnRenderingUpdate() {
if (mMatches == mMatchesOnRenderingUpdate) {
return false;
}
mMatchesOnRenderingUpdate = mMatches;
return HasListeners();
}
void MediaQueryList::FireChangeEvent() {
MediaQueryListEventInit init;
init.mBubbles = false;
init.mCancelable = false;
init.mMatches = mMatches;
mMediaList->GetText(init.mMedia);
RefPtr<MediaQueryListEvent> event =
MediaQueryListEvent::Constructor(this, u"change"_ns, init);
event->SetTrusted(true);
DispatchEvent(*event);
}
size_t MediaQueryList::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
size_t n = 0;
// mMediaList is reference counted, but it's created and primarily owned
// by this MediaQueryList object.
n += mMediaList->SizeOfIncludingThis(aMallocSizeOf);
return n;
}
} // namespace mozilla::dom
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