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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"
#define ONCHANGE_STRING u"change"_ns
namespace mozilla {
namespace dom {
MediaQueryList::MediaQueryList(Document* aDocument,
const nsACString& aMediaQueryList,
CallerType aCallerType)
: DOMEventTargetHelper(aDocument->GetInnerWindow()),
mDocument(aDocument),
mMatches(false),
mMatchesValid(false) {
mMediaList = MediaList::Create(aMediaQueryList, aCallerType);
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) {
mMediaList->GetText(aMedia);
}
bool MediaQueryList::Matches() {
if (!mMatchesValid) {
MOZ_ASSERT(!HasListeners(),
"when listeners present, must keep mMatches current");
RecomputeMatches();
}
return mMatches;
}
void MediaQueryList::AddListener(EventListener* aListener, ErrorResult& aRv) {
if (!aListener) {
return;
}
AddEventListenerOptionsOrBoolean options;
options.SetAsBoolean() = false;
AddEventListener(ONCHANGE_STRING, aListener, options, Nullable<bool>(), aRv);
}
void MediaQueryList::EventListenerAdded(nsAtom* aType) {
// HasListeners() might still be false if the added thing wasn't a
// listener we care about.
if (!mMatchesValid && HasListeners()) {
RecomputeMatches();
}
DOMEventTargetHelper::EventListenerAdded(aType);
}
void MediaQueryList::RemoveListener(EventListener* aListener,
ErrorResult& aRv) {
if (!aListener) {
return;
}
EventListenerOptionsOrBoolean options;
options.SetAsBoolean() = false;
RemoveEventListener(ONCHANGE_STRING, aListener, options, aRv);
}
bool MediaQueryList::HasListeners() { return HasListenersFor(ONCHANGE_STRING); }
void MediaQueryList::Disconnect() {
DisconnectFromOwner();
IgnoreKeepAliveIfHasListenersFor(nsGkAtoms::onchange);
}
void MediaQueryList::RecomputeMatches() {
mMatches = false;
if (!mDocument) {
return;
}
mMatches = mMediaList->Matches(*mDocument);
mMatchesValid = true;
}
nsISupports* MediaQueryList::GetParentObject() const {
return ToSupports(mDocument);
}
JSObject* MediaQueryList::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MediaQueryList_Binding::Wrap(aCx, this, aGivenProto);
}
bool MediaQueryList::MediaFeatureValuesChanged() {
mMatchesValid = false;
if (!HasListeners()) {
return false; // No need to recompute or notify if we have no listeners.
}
bool oldMatches = mMatches;
RecomputeMatches();
return mMatches != oldMatches;
}
void MediaQueryList::FireChangeEvent() {
MediaQueryListEventInit init;
init.mBubbles = false;
init.mCancelable = false;
init.mMatches = mMatches;
mMediaList->GetText(init.mMedia);
RefPtr<MediaQueryListEvent> event =
MediaQueryListEvent::Constructor(this, ONCHANGE_STRING, 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 dom
} // namespace mozilla
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