Merge branch 'redwood' into releaseRELBASE_20200929RC_20200924

1 files changed, 304 insertions, 0 deletions

diff --git a/dom/base/ResizeObserver.cpp b/dom/base/ResizeObserver.cpp
new file mode 100644
index 000000000..37d940c2b
--- /dev/null
+++ b/dom/base/ResizeObserver.cpp
@@ -0,0 +1,304 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

+/* 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 "mozilla/dom/ResizeObserver.h"

+

+#include "mozilla/dom/DOMRect.h"

+#include "nsContentUtils.h"

+#include "nsIFrame.h"

+#include "nsSVGUtils.h"

+

+namespace mozilla {

+namespace dom {

+

+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ResizeObserver)

+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

+  NS_INTERFACE_MAP_ENTRY(nsISupports)

+NS_INTERFACE_MAP_END

+

+NS_IMPL_CYCLE_COLLECTING_ADDREF(ResizeObserver)

+NS_IMPL_CYCLE_COLLECTING_RELEASE(ResizeObserver)

+

+NS_IMPL_CYCLE_COLLECTION_CLASS(ResizeObserver)

+

+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ResizeObserver)

+  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER

+NS_IMPL_CYCLE_COLLECTION_TRACE_END

+

+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ResizeObserver)

+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER

+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)

+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mCallback)

+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mObservationMap)

+NS_IMPL_CYCLE_COLLECTION_UNLINK_END

+

+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ResizeObserver)

+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)

+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallback)

+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mObservationMap)

+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

+

+already_AddRefed<ResizeObserver>

+ResizeObserver::Constructor(const GlobalObject& aGlobal,

+                            ResizeObserverCallback& aCb,

+                            ErrorResult& aRv)

+{

+  nsCOMPtr<nsPIDOMWindowInner> window =

+    do_QueryInterface(aGlobal.GetAsSupports());

+

+  if (!window) {

+    aRv.Throw(NS_ERROR_FAILURE);

+    return nullptr;

+  }

+

+  nsCOMPtr<nsIDocument> document = window->GetExtantDoc();

+

+  if (!document) {

+    aRv.Throw(NS_ERROR_FAILURE);

+    return nullptr;

+  }

+

+  RefPtr<ResizeObserver> observer = new ResizeObserver(window.forget(), aCb);

+  document->AddResizeObserver(observer);

+

+  return observer.forget();

+}

+

+void

+ResizeObserver::Observe(Element* aTarget,

+                        ErrorResult& aRv)

+{

+  if (!aTarget) {

+    aRv.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);

+    return;

+  }

+

+  RefPtr<ResizeObservation> observation;

+

+  if (!mObservationMap.Get(aTarget, getter_AddRefs(observation))) {

+    observation = new ResizeObservation(this, aTarget);

+

+    mObservationMap.Put(aTarget, observation);

+    mObservationList.insertBack(observation);

+

+    // Per the spec, we need to trigger notification in event loop that

+    // contains ResizeObserver observe call even when resize/reflow does

+    // not happen.

+    aTarget->OwnerDoc()->ScheduleResizeObserversNotification();

+  }

+}

+

+void

+ResizeObserver::Unobserve(Element* aTarget,

+                          ErrorResult& aRv)

+{

+  if (!aTarget) {

+    aRv.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);

+    return;

+  }

+

+  RefPtr<ResizeObservation> observation;

+

+  if (mObservationMap.Get(aTarget, getter_AddRefs(observation))) {

+    mObservationMap.Remove(aTarget);

+

+    MOZ_ASSERT(!mObservationList.isEmpty(),

+               "If ResizeObservation found for an element, observation list "

+               "must be not empty.");

+

+    observation->remove();

+  }

+}

+

+void

+ResizeObserver::Disconnect()

+{

+  mObservationMap.Clear();

+  mObservationList.clear();

+  mActiveTargets.Clear();

+}

+

+void

+ResizeObserver::GatherActiveObservations(uint32_t aDepth)

+{

+  mActiveTargets.Clear();

+  mHasSkippedTargets = false;

+

+  for (auto observation : mObservationList) {

+    if (observation->IsActive()) {

+      uint32_t targetDepth =

+        nsContentUtils::GetNodeDepth(observation->Target());

+

+      if (targetDepth > aDepth) {

+        mActiveTargets.AppendElement(observation);

+      } else {

+        mHasSkippedTargets = true;

+      }

+    }

+  }

+}

+

+bool

+ResizeObserver::HasActiveObservations() const

+{

+  return !mActiveTargets.IsEmpty();

+}

+

+bool

+ResizeObserver::HasSkippedObservations() const

+{

+  return mHasSkippedTargets;

+}

+

+uint32_t

+ResizeObserver::BroadcastActiveObservations()

+{

+  uint32_t shallowestTargetDepth = UINT32_MAX;

+

+  if (HasActiveObservations()) {

+    Sequence<OwningNonNull<ResizeObserverEntry>> entries;

+

+    for (auto observation : mActiveTargets) {

+      RefPtr<ResizeObserverEntry> entry =

+        new ResizeObserverEntry(this, observation->Target());

+

+      nsRect rect = observation->GetTargetRect();

+      entry->SetContentRect(rect);

+

+      if (!entries.AppendElement(entry.forget(), fallible)) {

+        // Out of memory.

+        break;

+      }

+

+      // Sync the broadcast size of observation so the next size inspection

+      // will be based on the updated size from last delivered observations.

+      observation->UpdateBroadcastSize(rect);

+

+      uint32_t targetDepth =

+        nsContentUtils::GetNodeDepth(observation->Target());

+

+      if (targetDepth < shallowestTargetDepth) {

+        shallowestTargetDepth = targetDepth;

+      }

+    }

+

+    mCallback->Call(this, entries, *this);

+    mActiveTargets.Clear();

+    mHasSkippedTargets = false;

+  }

+

+  return shallowestTargetDepth;

+}

+

+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ResizeObserverEntry)

+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

+  NS_INTERFACE_MAP_ENTRY(nsISupports)

+NS_INTERFACE_MAP_END

+

+NS_IMPL_CYCLE_COLLECTING_ADDREF(ResizeObserverEntry)

+NS_IMPL_CYCLE_COLLECTING_RELEASE(ResizeObserverEntry)

+

+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ResizeObserverEntry,

+                                      mTarget, mContentRect,

+                                      mOwner)

+

+already_AddRefed<ResizeObserverEntry>

+ResizeObserverEntry::Constructor(const GlobalObject& aGlobal,

+                                 Element* aTarget,

+                                 ErrorResult& aRv)

+{

+  RefPtr<ResizeObserverEntry> observerEntry =

+    new ResizeObserverEntry(aGlobal.GetAsSupports(), aTarget);

+  return observerEntry.forget();

+}

+

+void

+ResizeObserverEntry::SetContentRect(nsRect aRect)

+{

+  RefPtr<DOMRect> contentRect = new DOMRect(mTarget);

+  nsIFrame* frame = mTarget->GetPrimaryFrame();

+

+  if (frame) {

+    nsMargin padding = frame->GetUsedPadding();

+

+    // Per the spec, we need to include padding in contentRect of

+    // ResizeObserverEntry.

+    aRect.x = padding.left;

+    aRect.y = padding.top;

+  }

+

+  contentRect->SetLayoutRect(aRect);

+  mContentRect = contentRect.forget();

+}

+

+ResizeObserverEntry::~ResizeObserverEntry()

+{

+}

+

+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ResizeObservation)

+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

+  NS_INTERFACE_MAP_ENTRY(nsISupports)

+NS_INTERFACE_MAP_END

+

+NS_IMPL_CYCLE_COLLECTING_ADDREF(ResizeObservation)

+NS_IMPL_CYCLE_COLLECTING_RELEASE(ResizeObservation)

+

+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ResizeObservation,

+                                      mTarget, mOwner)

+

+already_AddRefed<ResizeObservation>

+ResizeObservation::Constructor(const GlobalObject& aGlobal,

+                               Element* aTarget,

+                               ErrorResult& aRv)

+{

+  RefPtr<ResizeObservation> observation =

+    new ResizeObservation(aGlobal.GetAsSupports(), aTarget);

+  return observation.forget();

+}

+

+bool

+ResizeObservation::IsActive() const

+{

+  nsRect rect = GetTargetRect();

+  return (rect.width != mBroadcastWidth || rect.height != mBroadcastHeight);

+}

+

+void

+ResizeObservation::UpdateBroadcastSize(nsRect aRect)

+{

+  mBroadcastWidth = aRect.width;

+  mBroadcastHeight = aRect.height;

+}

+

+nsRect

+ResizeObservation::GetTargetRect() const

+{

+  nsRect rect;

+  nsIFrame* frame = mTarget->GetPrimaryFrame();

+

+  if (frame) {

+    if (mTarget->IsSVGElement()) {

+      gfxRect bbox = nsSVGUtils::GetBBox(frame);

+      rect.width = NSFloatPixelsToAppUnits(bbox.width, AppUnitsPerCSSPixel());

+      rect.height = NSFloatPixelsToAppUnits(bbox.height, AppUnitsPerCSSPixel());

+    } else {

+      // Per the spec, non-replaced inline Elements will always have an empty

+      // content rect.

+      if (frame->IsFrameOfType(nsIFrame::eReplaced) ||

+          !frame->IsFrameOfType(nsIFrame::eLineParticipant)) {

+        rect = frame->GetContentRectRelativeToSelf();

+      }

+    }

+  }

+

+  return rect;

+}

+

+ResizeObservation::~ResizeObservation()

+{

+}

+

+} // namespace dom

+} // namespace mozilla