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Diffstat (limited to 'dom/base/ResizeObserver.cpp')
| -rw-r--r-- | dom/base/ResizeObserver.cpp | 604 |
1 files changed, 604 insertions, 0 deletions
diff --git a/dom/base/ResizeObserver.cpp b/dom/base/ResizeObserver.cpp new file mode 100644 index 0000000000..cc9865ee2e --- /dev/null +++ b/dom/base/ResizeObserver.cpp @@ -0,0 +1,604 @@ +/* -*- 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 "mozilla/dom/ResizeObserver.h" + +#include "mozilla/dom/DOMRect.h" +#include "mozilla/dom/Document.h" +#include "mozilla/SVGUtils.h" +#include "nsIContent.h" +#include "nsIContentInlines.h" +#include "nsIScrollableFrame.h" +#include "nsLayoutUtils.h" +#include <limits> + +namespace mozilla::dom { + +/** + * Returns the length of the parent-traversal path (in terms of the number of + * nodes) to an unparented/root node from aNode. An unparented/root node is + * considered to have a depth of 1, its children have a depth of 2, etc. + * aNode is expected to be non-null. + * Note: The shadow root is not part of the calculation because the caller, + * ResizeObserver, doesn't observe the shadow root, and only needs relative + * depths among all the observed targets. In other words, we calculate the + * depth of the flattened tree. + * + * However, these is a spec issue about how to handle shadow DOM case. We + * may need to update this function later: + * https://github.com/w3c/csswg-drafts/issues/3840 + * + * https://drafts.csswg.org/resize-observer/#calculate-depth-for-node-h + */ +static uint32_t GetNodeDepth(nsINode* aNode) { + uint32_t depth = 1; + + MOZ_ASSERT(aNode, "Node shouldn't be null"); + + // Use GetFlattenedTreeParentNode to bypass the shadow root and cross the + // shadow boundary to calculate the node depth without the shadow root. + while ((aNode = aNode->GetFlattenedTreeParentNode())) { + ++depth; + } + + return depth; +} + +static nsSize GetContentRectSize(const nsIFrame& aFrame) { + if (const nsIScrollableFrame* f = do_QueryFrame(&aFrame)) { + // We return the scrollport rect for compat with other UAs, see bug 1733042. + // But the scrollPort includes padding (but not border!), so remove it. + nsRect scrollPort = f->GetScrollPortRect(); + nsMargin padding = + aFrame.GetUsedPadding().ApplySkipSides(aFrame.GetSkipSides()); + scrollPort.Deflate(padding); + // This can break in some edge cases like when layout overflows sizes or + // what not. + NS_ASSERTION( + !aFrame.PresContext()->UseOverlayScrollbars() || + scrollPort.Size() == aFrame.GetContentRectRelativeToSelf().Size(), + "Wrong scrollport?"); + return scrollPort.Size(); + } + return aFrame.GetContentRectRelativeToSelf().Size(); +} + +/** + * Returns |aTarget|'s size in the form of gfx::Size (in pixels). + * If the target is an SVG that does not participate in CSS layout, + * its width and height are determined from bounding box. + * + * https://www.w3.org/TR/resize-observer-1/#calculate-box-size + */ +static AutoTArray<LogicalPixelSize, 1> CalculateBoxSize( + Element* aTarget, ResizeObserverBoxOptions aBox, + const ResizeObserver& aObserver) { + nsIFrame* frame = aTarget->GetPrimaryFrame(); + + if (!frame) { + // TODO: Should this return an empty array instead? + // https://github.com/w3c/csswg-drafts/issues/7734 + return {LogicalPixelSize()}; + } + + if (frame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) { + // Per the spec, this target's SVG size is always its bounding box size no + // matter what box option you choose, because SVG elements do not use + // standard CSS box model. + // TODO: what if the SVG is fragmented? + // https://github.com/w3c/csswg-drafts/issues/7736 + const gfxRect bbox = SVGUtils::GetBBox(frame); + gfx::Size size(static_cast<float>(bbox.width), + static_cast<float>(bbox.height)); + const WritingMode wm = frame->GetWritingMode(); + if (aBox == ResizeObserverBoxOptions::Device_pixel_content_box) { + // Per spec, we calculate the inline/block sizes to target’s bounding box + // {inline|block} length, in integral device pixels, so we round the final + // result. + // https://drafts.csswg.org/resize-observer/#dom-resizeobserverboxoptions-device-pixel-content-box + const LayoutDeviceIntSize snappedSize = + RoundedToInt(CSSSize::FromUnknownSize(size) * + frame->PresContext()->CSSToDevPixelScale()); + return {LogicalPixelSize(wm, gfx::Size(snappedSize.ToUnknownSize()))}; + } + return {LogicalPixelSize(wm, size)}; + } + + // Per the spec, non-replaced inline Elements will always have an empty + // content rect. Therefore, we always use the same trivially-empty size + // for non-replaced inline elements here, and their IsActive() will + // always return false. (So its observation won't be fired.) + // TODO: Should we use an empty array instead? + // https://github.com/w3c/csswg-drafts/issues/7734 + if (!frame->IsFrameOfType(nsIFrame::eReplaced) && + frame->IsFrameOfType(nsIFrame::eLineParticipant)) { + return {LogicalPixelSize()}; + } + + auto GetFrameSize = [aBox](nsIFrame* aFrame) { + switch (aBox) { + case ResizeObserverBoxOptions::Border_box: + return CSSPixel::FromAppUnits(aFrame->GetSize()).ToUnknownSize(); + case ResizeObserverBoxOptions::Device_pixel_content_box: { + // Simply converting from app units to device units is insufficient - we + // need to take subpixel snapping into account. Subpixel snapping + // happens with respect to the reference frame, so do the dev pixel + // conversion with our rectangle positioned relative to the reference + // frame, then get the size from there. + const auto* referenceFrame = nsLayoutUtils::GetReferenceFrame(aFrame); + // GetOffsetToCrossDoc version handles <iframe>s in addition to normal + // cases. We don't expect this to tight loop for additional checks to + // matter. + const auto offset = aFrame->GetOffsetToCrossDoc(referenceFrame); + const auto contentSize = GetContentRectSize(*aFrame); + // Casting to double here is deliberate to minimize rounding error in + // upcoming operations. + const auto appUnitsPerDevPixel = + static_cast<double>(aFrame->PresContext()->AppUnitsPerDevPixel()); + // Calculation here is a greatly simplified version of + // `NSRectToSnappedRect` as 1) we're not actually drawing (i.e. no draw + // target), and 2) transform does not need to be taken into account. + gfx::Rect rect{gfx::Float(offset.X() / appUnitsPerDevPixel), + gfx::Float(offset.Y() / appUnitsPerDevPixel), + gfx::Float(contentSize.Width() / appUnitsPerDevPixel), + gfx::Float(contentSize.Height() / appUnitsPerDevPixel)}; + gfx::Point tl = rect.TopLeft().Round(); + gfx::Point br = rect.BottomRight().Round(); + + rect.SizeTo(gfx::Size(br.x - tl.x, br.y - tl.y)); + rect.NudgeToIntegers(); + return rect.Size().ToUnknownSize(); + } + case ResizeObserverBoxOptions::Content_box: + default: + break; + } + return CSSPixel::FromAppUnits(GetContentRectSize(*aFrame)).ToUnknownSize(); + }; + if (!StaticPrefs::dom_resize_observer_support_fragments() && + !aObserver.HasNativeCallback()) { + return {LogicalPixelSize(frame->GetWritingMode(), GetFrameSize(frame))}; + } + AutoTArray<LogicalPixelSize, 1> size; + for (nsIFrame* cur = frame; cur; cur = cur->GetNextContinuation()) { + const WritingMode wm = cur->GetWritingMode(); + size.AppendElement(LogicalPixelSize(wm, GetFrameSize(cur))); + } + return size; +} + +NS_IMPL_CYCLE_COLLECTION_CLASS(ResizeObservation) + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ResizeObservation) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTarget); +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ResizeObservation) + tmp->Unlink(RemoveFromObserver::Yes); +NS_IMPL_CYCLE_COLLECTION_UNLINK_END + +ResizeObservation::ResizeObservation(Element& aTarget, + ResizeObserver& aObserver, + ResizeObserverBoxOptions aBox) + : mTarget(&aTarget), + mObserver(&aObserver), + mObservedBox(aBox), + mLastReportedSize( + {StaticPrefs::dom_resize_observer_last_reported_size_invalid() + ? LogicalPixelSize(WritingMode(), gfx::Size(-1, -1)) + : LogicalPixelSize()}) { + aTarget.BindObject(mObserver); +} + +void ResizeObservation::Unlink(RemoveFromObserver aRemoveFromObserver) { + ResizeObserver* observer = std::exchange(mObserver, nullptr); + nsCOMPtr<Element> target = std::move(mTarget); + if (observer && target) { + if (aRemoveFromObserver == RemoveFromObserver::Yes) { + observer->Unobserve(*target); + } + target->UnbindObject(observer); + } +} + +bool ResizeObservation::IsActive() const { + // As detailed in the css-contain specification, if the target is hidden by + // `content-visibility` it should not call its ResizeObservation callbacks. + nsIFrame* frame = mTarget->GetPrimaryFrame(); + if (frame && frame->IsHiddenByContentVisibilityOnAnyAncestor()) { + return false; + } + + return mLastReportedSize != + CalculateBoxSize(mTarget, mObservedBox, *mObserver); +} + +void ResizeObservation::UpdateLastReportedSize( + const nsTArray<LogicalPixelSize>& aSize) { + mLastReportedSize.Assign(aSize); +} + +// Only needed for refcounted objects. +NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(ResizeObserver) + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ResizeObserver) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner, mDocument, mActiveTargets, + mObservationMap); + if (tmp->mCallback.is<RefPtr<ResizeObserverCallback>>()) { + ImplCycleCollectionTraverse( + cb, tmp->mCallback.as<RefPtr<ResizeObserverCallback>>(), "mCallback", + 0); + } +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ResizeObserver) + tmp->Disconnect(); + NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner, mDocument, mActiveTargets, + mObservationMap); + if (tmp->mCallback.is<RefPtr<ResizeObserverCallback>>()) { + ImplCycleCollectionUnlink( + tmp->mCallback.as<RefPtr<ResizeObserverCallback>>()); + } + NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER +NS_IMPL_CYCLE_COLLECTION_UNLINK_END + +NS_IMPL_CYCLE_COLLECTING_ADDREF(ResizeObserver) +NS_IMPL_CYCLE_COLLECTING_RELEASE(ResizeObserver) +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ResizeObserver) + NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY + NS_INTERFACE_MAP_ENTRY(nsISupports) +NS_INTERFACE_MAP_END + +ResizeObserver::ResizeObserver(Document& aDocument, NativeCallback aCallback) + : mOwner(aDocument.GetInnerWindow()), + mDocument(&aDocument), + mCallback(aCallback) { + MOZ_ASSERT(mOwner, "Need a non-null owner window"); + MOZ_ASSERT(mDocument == mOwner->GetExtantDoc()); +} + +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; + } + + Document* doc = window->GetExtantDoc(); + if (!doc) { + aRv.Throw(NS_ERROR_FAILURE); + return nullptr; + } + + return do_AddRef(new ResizeObserver(std::move(window), doc, aCb)); +} + +void ResizeObserver::Observe(Element& aTarget, + const ResizeObserverOptions& aOptions) { + if (MOZ_UNLIKELY(!mDocument)) { + MOZ_ASSERT_UNREACHABLE("How did we call observe() after unlink?"); + return; + } + + // NOTE(emilio): Per spec, this is supposed to happen on construction, but the + // spec isn't particularly sane here, see + // https://github.com/w3c/csswg-drafts/issues/4518 + if (mObservationList.isEmpty()) { + MOZ_ASSERT(mObservationMap.IsEmpty()); + mDocument->AddResizeObserver(*this); + } + + auto& observation = mObservationMap.LookupOrInsert(&aTarget); + if (observation) { + if (observation->BoxOptions() == aOptions.mBox) { + // Already observed this target and the observed box is the same, so + // return. + // Note: Based on the spec, we should unobserve it first. However, + // calling Unobserve() when we observe the same box will remove original + // ResizeObservation and then add a new one, this may cause an unexpected + // result because ResizeObservation stores the mLastReportedSize which + // should be kept to make sure IsActive() returns the correct result. + return; + } + // Remove the pre-existing entry, but without unregistering ourselves from + // the controller. + observation->remove(); + observation = nullptr; + } + + observation = new ResizeObservation(aTarget, *this, aOptions.mBox); + if (!StaticPrefs::dom_resize_observer_last_reported_size_invalid() && + this == mDocument->GetLastRememberedSizeObserver()) { + // Resize observations are initialized with a (0, 0) mLastReportedSize, + // this means that the callback won't be called if the element is 0x0. + // But we need it called for handling the last remembered size, so set + // mLastReportedSize to an invalid size to ensure IsActive() is true + // for the current element size. + // See https://github.com/w3c/csswg-drafts/issues/3664 about doing this in + // the general case, then we won't need this hack for the last remembered + // size, and will have consistency with IntersectionObserver. + observation->UpdateLastReportedSize( + {LogicalPixelSize(WritingMode(), gfx::Size(-1, -1))}); + MOZ_ASSERT(observation->IsActive()); + } + 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. + mDocument->ScheduleResizeObserversNotification(); +} + +void ResizeObserver::Unobserve(Element& aTarget) { + RefPtr<ResizeObservation> observation; + if (!mObservationMap.Remove(&aTarget, getter_AddRefs(observation))) { + return; + } + + MOZ_ASSERT(!mObservationList.isEmpty(), + "If ResizeObservation found for an element, observation list " + "must be not empty."); + observation->remove(); + if (mObservationList.isEmpty()) { + if (MOZ_LIKELY(mDocument)) { + mDocument->RemoveResizeObserver(*this); + } + } +} + +void ResizeObserver::Disconnect() { + const bool registered = !mObservationList.isEmpty(); + while (auto* observation = mObservationList.popFirst()) { + observation->Unlink(ResizeObservation::RemoveFromObserver::No); + } + MOZ_ASSERT(mObservationList.isEmpty()); + mObservationMap.Clear(); + mActiveTargets.Clear(); + if (registered && MOZ_LIKELY(mDocument)) { + mDocument->RemoveResizeObserver(*this); + } +} + +void ResizeObserver::GatherActiveObservations(uint32_t aDepth) { + mActiveTargets.Clear(); + mHasSkippedTargets = false; + + for (auto* observation : mObservationList) { + if (!observation->IsActive()) { + continue; + } + + uint32_t targetDepth = GetNodeDepth(observation->Target()); + + if (targetDepth > aDepth) { + mActiveTargets.AppendElement(observation); + } else { + mHasSkippedTargets = true; + } + } +} + +uint32_t ResizeObserver::BroadcastActiveObservations() { + uint32_t shallowestTargetDepth = std::numeric_limits<uint32_t>::max(); + + if (!HasActiveObservations()) { + return shallowestTargetDepth; + } + + Sequence<OwningNonNull<ResizeObserverEntry>> entries; + + for (auto& observation : mActiveTargets) { + Element* target = observation->Target(); + + auto borderBoxSize = + CalculateBoxSize(target, ResizeObserverBoxOptions::Border_box, *this); + auto contentBoxSize = + CalculateBoxSize(target, ResizeObserverBoxOptions::Content_box, *this); + auto devicePixelContentBoxSize = CalculateBoxSize( + target, ResizeObserverBoxOptions::Device_pixel_content_box, *this); + RefPtr<ResizeObserverEntry> entry = + new ResizeObserverEntry(mOwner, *target, borderBoxSize, contentBoxSize, + devicePixelContentBoxSize); + + 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. + switch (observation->BoxOptions()) { + case ResizeObserverBoxOptions::Border_box: + observation->UpdateLastReportedSize(borderBoxSize); + break; + case ResizeObserverBoxOptions::Device_pixel_content_box: + observation->UpdateLastReportedSize(devicePixelContentBoxSize); + break; + case ResizeObserverBoxOptions::Content_box: + default: + observation->UpdateLastReportedSize(contentBoxSize); + } + + uint32_t targetDepth = GetNodeDepth(observation->Target()); + + if (targetDepth < shallowestTargetDepth) { + shallowestTargetDepth = targetDepth; + } + } + + if (mCallback.is<RefPtr<ResizeObserverCallback>>()) { + RefPtr<ResizeObserverCallback> callback( + mCallback.as<RefPtr<ResizeObserverCallback>>()); + callback->Call(this, entries, *this); + } else { + mCallback.as<NativeCallback>()(entries, *this); + } + + mActiveTargets.Clear(); + mHasSkippedTargets = false; + + return shallowestTargetDepth; +} + +NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ResizeObserverEntry, mOwner, mTarget, + mContentRect, mBorderBoxSize, + mContentBoxSize, + mDevicePixelContentBoxSize) +NS_IMPL_CYCLE_COLLECTING_ADDREF(ResizeObserverEntry) +NS_IMPL_CYCLE_COLLECTING_RELEASE(ResizeObserverEntry) +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ResizeObserverEntry) + NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY + NS_INTERFACE_MAP_ENTRY(nsISupports) +NS_INTERFACE_MAP_END + +void ResizeObserverEntry::GetBorderBoxSize( + nsTArray<RefPtr<ResizeObserverSize>>& aRetVal) const { + // In the resize-observer-1 spec, there will only be a single + // ResizeObserverSize returned in the FrozenArray for now. + // + // Note: the usage of FrozenArray is to support elements that have multiple + // fragments, which occur in multi-column scenarios. + // https://drafts.csswg.org/resize-observer/#resize-observer-entry-interface + aRetVal.Assign(mBorderBoxSize); +} + +void ResizeObserverEntry::GetContentBoxSize( + nsTArray<RefPtr<ResizeObserverSize>>& aRetVal) const { + // In the resize-observer-1 spec, there will only be a single + // ResizeObserverSize returned in the FrozenArray for now. + // + // Note: the usage of FrozenArray is to support elements that have multiple + // fragments, which occur in multi-column scenarios. + // https://drafts.csswg.org/resize-observer/#resize-observer-entry-interface + aRetVal.Assign(mContentBoxSize); +} + +void ResizeObserverEntry::GetDevicePixelContentBoxSize( + nsTArray<RefPtr<ResizeObserverSize>>& aRetVal) const { + // In the resize-observer-1 spec, there will only be a single + // ResizeObserverSize returned in the FrozenArray for now. + // + // Note: the usage of FrozenArray is to support elements that have multiple + // fragments, which occur in multi-column scenarios. + // https://drafts.csswg.org/resize-observer/#resize-observer-entry-interface + aRetVal.Assign(mDevicePixelContentBoxSize); +} + +void ResizeObserverEntry::SetBorderBoxSize( + const nsTArray<LogicalPixelSize>& aSize) { + mBorderBoxSize.Clear(); + mBorderBoxSize.SetCapacity(aSize.Length()); + for (const LogicalPixelSize& size : aSize) { + mBorderBoxSize.AppendElement(new ResizeObserverSize(mOwner, size)); + } +} + +void ResizeObserverEntry::SetContentRectAndSize( + const nsTArray<LogicalPixelSize>& aSize) { + nsIFrame* frame = mTarget->GetPrimaryFrame(); + + // 1. Update mContentRect. + nsMargin padding = frame ? frame->GetUsedPadding() : nsMargin(); + // Per the spec, we need to use the top-left padding offset as the origin of + // our contentRect. + gfx::Size sizeForRect; + MOZ_DIAGNOSTIC_ASSERT(!aSize.IsEmpty()); + if (!aSize.IsEmpty()) { + const WritingMode wm = frame ? frame->GetWritingMode() : WritingMode(); + sizeForRect = aSize[0].PhysicalSize(wm); + } + nsRect rect(nsPoint(padding.left, padding.top), + CSSPixel::ToAppUnits(CSSSize::FromUnknownSize(sizeForRect))); + RefPtr<DOMRect> contentRect = new DOMRect(mOwner); + contentRect->SetLayoutRect(rect); + mContentRect = std::move(contentRect); + + // 2. Update mContentBoxSize. + mContentBoxSize.Clear(); + mContentBoxSize.SetCapacity(aSize.Length()); + for (const LogicalPixelSize& size : aSize) { + mContentBoxSize.AppendElement(new ResizeObserverSize(mOwner, size)); + } +} + +void ResizeObserverEntry::SetDevicePixelContentSize( + const nsTArray<LogicalPixelSize>& aSize) { + mDevicePixelContentBoxSize.Clear(); + mDevicePixelContentBoxSize.SetCapacity(aSize.Length()); + for (const LogicalPixelSize& size : aSize) { + mDevicePixelContentBoxSize.AppendElement( + new ResizeObserverSize(mOwner, size)); + } +} + +static void LastRememberedSizeCallback( + const Sequence<OwningNonNull<ResizeObserverEntry>>& aEntries, + ResizeObserver& aObserver) { + for (const auto& entry : aEntries) { + Element* target = entry->Target(); + if (!target->IsInComposedDoc()) { + aObserver.Unobserve(*target); + target->RemoveLastRememberedBSize(); + target->RemoveLastRememberedISize(); + continue; + } + nsIFrame* frame = target->GetPrimaryFrame(); + if (!frame) { + aObserver.Unobserve(*target); + continue; + } + MOZ_ASSERT(!frame->IsFrameOfType(nsIFrame::eLineParticipant) || + frame->IsFrameOfType(nsIFrame::eReplaced), + "Should have unobserved non-replaced inline."); + MOZ_ASSERT(!frame->HidesContent(), + "Should have unobserved element skipping its contents."); + const nsStylePosition* stylePos = frame->StylePosition(); + const WritingMode wm = frame->GetWritingMode(); + bool canUpdateBSize = stylePos->ContainIntrinsicBSize(wm).IsAutoLength(); + bool canUpdateISize = stylePos->ContainIntrinsicISize(wm).IsAutoLength(); + MOZ_ASSERT(canUpdateBSize || !target->HasLastRememberedBSize(), + "Should have removed the last remembered block size."); + MOZ_ASSERT(canUpdateISize || !target->HasLastRememberedISize(), + "Should have removed the last remembered inline size."); + MOZ_ASSERT(canUpdateBSize || canUpdateISize, + "Should have unobserved if we can't update any size."); + AutoTArray<RefPtr<ResizeObserverSize>, 1> contentSizeList; + entry->GetContentBoxSize(contentSizeList); + MOZ_ASSERT(!contentSizeList.IsEmpty()); + if (canUpdateBSize) { + float bSize = 0; + for (const auto& current : contentSizeList) { + bSize += current->BlockSize(); + } + target->SetLastRememberedBSize(bSize); + } + if (canUpdateISize) { + float iSize = 0; + for (const auto& current : contentSizeList) { + iSize = std::max(iSize, current->InlineSize()); + } + target->SetLastRememberedISize(iSize); + } + } +} + +/* static */ already_AddRefed<ResizeObserver> +ResizeObserver::CreateLastRememberedSizeObserver(Document& aDocument) { + return do_AddRef(new ResizeObserver(aDocument, LastRememberedSizeCallback)); +} + +NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ResizeObserverSize, mOwner) +NS_IMPL_CYCLE_COLLECTING_ADDREF(ResizeObserverSize) +NS_IMPL_CYCLE_COLLECTING_RELEASE(ResizeObserverSize) +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ResizeObserverSize) + NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY + NS_INTERFACE_MAP_ENTRY(nsISupports) +NS_INTERFACE_MAP_END + +} // namespace mozilla::dom |