gecko-dev/dom/presentation/PresentationAvailability.cpp

200 строки
6.0 KiB
C++

/* -*- 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/. */
#include "PresentationAvailability.h"
#include "mozilla/dom/PresentationAvailabilityBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/Unused.h"
#include "nsContentUtils.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIPresentationDeviceManager.h"
#include "nsIPresentationService.h"
#include "nsServiceManagerUtils.h"
#include "PresentationLog.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_CYCLE_COLLECTION_CLASS(PresentationAvailability)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(PresentationAvailability,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPromises)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(PresentationAvailability,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPromises);
tmp->Shutdown();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_ADDREF_INHERITED(PresentationAvailability, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(PresentationAvailability, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PresentationAvailability)
NS_INTERFACE_MAP_ENTRY(nsIPresentationAvailabilityListener)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
/* static */
already_AddRefed<PresentationAvailability> PresentationAvailability::Create(
nsPIDOMWindowInner* aWindow, const nsTArray<nsString>& aUrls,
RefPtr<Promise>& aPromise) {
RefPtr<PresentationAvailability> availability =
new PresentationAvailability(aWindow, aUrls);
return NS_WARN_IF(!availability->Init(aPromise)) ? nullptr
: availability.forget();
}
PresentationAvailability::PresentationAvailability(
nsPIDOMWindowInner* aWindow, const nsTArray<nsString>& aUrls)
: DOMEventTargetHelper(aWindow), mIsAvailable(false), mUrls(aUrls) {
for (uint32_t i = 0; i < mUrls.Length(); ++i) {
mAvailabilityOfUrl.AppendElement(false);
}
}
PresentationAvailability::~PresentationAvailability() { Shutdown(); }
bool PresentationAvailability::Init(RefPtr<Promise>& aPromise) {
nsCOMPtr<nsIPresentationService> service =
do_GetService(PRESENTATION_SERVICE_CONTRACTID);
if (NS_WARN_IF(!service)) {
return false;
}
nsresult rv = service->RegisterAvailabilityListener(mUrls, this);
if (NS_WARN_IF(NS_FAILED(rv))) {
// If the user agent is unable to monitor available device,
// Resolve promise with |value| set to false.
mIsAvailable = false;
aPromise->MaybeResolve(this);
return true;
}
EnqueuePromise(aPromise);
AvailabilityCollection* collection = AvailabilityCollection::GetSingleton();
if (collection) {
collection->Add(this);
}
return true;
}
void PresentationAvailability::Shutdown() {
AvailabilityCollection* collection = AvailabilityCollection::GetSingleton();
if (collection) {
collection->Remove(this);
}
nsCOMPtr<nsIPresentationService> service =
do_GetService(PRESENTATION_SERVICE_CONTRACTID);
if (NS_WARN_IF(!service)) {
return;
}
Unused << NS_WARN_IF(
NS_FAILED(service->UnregisterAvailabilityListener(mUrls, this)));
}
/* virtual */
void PresentationAvailability::DisconnectFromOwner() {
Shutdown();
DOMEventTargetHelper::DisconnectFromOwner();
}
/* virtual */
JSObject* PresentationAvailability::WrapObject(
JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
return PresentationAvailability_Binding::Wrap(aCx, this, aGivenProto);
}
bool PresentationAvailability::Equals(const uint64_t aWindowID,
const nsTArray<nsString>& aUrls) const {
if (GetOwner() && GetOwner()->WindowID() == aWindowID &&
mUrls.Length() == aUrls.Length()) {
for (const auto& url : aUrls) {
if (!mUrls.Contains(url)) {
return false;
}
}
return true;
}
return false;
}
bool PresentationAvailability::IsCachedValueReady() {
// All pending promises will be solved when cached value is ready and
// no promise should be enqueued afterward.
return mPromises.IsEmpty();
}
void PresentationAvailability::EnqueuePromise(RefPtr<Promise>& aPromise) {
mPromises.AppendElement(aPromise);
}
bool PresentationAvailability::Value() const {
if (nsContentUtils::ShouldResistFingerprinting()) {
return false;
}
return mIsAvailable;
}
NS_IMETHODIMP
PresentationAvailability::NotifyAvailableChange(
const nsTArray<nsString>& aAvailabilityUrls, bool aIsAvailable) {
bool available = false;
for (uint32_t i = 0; i < mUrls.Length(); ++i) {
if (aAvailabilityUrls.Contains(mUrls[i])) {
mAvailabilityOfUrl[i] = aIsAvailable;
}
available |= mAvailabilityOfUrl[i];
}
return NS_DispatchToCurrentThread(NewRunnableMethod<bool>(
"dom::PresentationAvailability::UpdateAvailabilityAndDispatchEvent", this,
&PresentationAvailability::UpdateAvailabilityAndDispatchEvent,
available));
}
void PresentationAvailability::UpdateAvailabilityAndDispatchEvent(
bool aIsAvailable) {
PRES_DEBUG("%s\n", __func__);
bool isChanged = (aIsAvailable != mIsAvailable);
mIsAvailable = aIsAvailable;
if (!mPromises.IsEmpty()) {
// Use the first availability change notification to resolve promise.
do {
nsTArray<RefPtr<Promise>> promises = std::move(mPromises);
if (nsContentUtils::ShouldResistFingerprinting()) {
continue;
}
for (auto& promise : promises) {
promise->MaybeResolve(this);
}
// more promises may have been added to mPromises, at least in theory
} while (!mPromises.IsEmpty());
return;
}
if (nsContentUtils::ShouldResistFingerprinting()) {
return;
}
if (isChanged) {
Unused << NS_WARN_IF(
NS_FAILED(DispatchTrustedEvent(NS_LITERAL_STRING("change"))));
}
}