import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/presentation/PresentationAvailability.cpp

@@ -0,0 +1,206 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 "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_INHERITED(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 PresentationAvailabilityBinding::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
+{
+  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>(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 = Move(mPromises);
+      for (auto& promise : promises) {
+        promise->MaybeResolve(this);
+      }
+      // more promises may have been added to mPromises, at least in theory
+    } while (!mPromises.IsEmpty());
+
+    return;
+  }
+
+  if (isChanged) {
+    Unused <<
+      NS_WARN_IF(NS_FAILED(DispatchTrustedEvent(NS_LITERAL_STRING("change"))));
+  }
+}