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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/. */
+
+/* rendering object to wrap rendering objects that should be scrollable */
+
+#ifndef nsGfxScrollFrame_h___
+#define nsGfxScrollFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsContainerFrame.h"
+#include "nsIAnonymousContentCreator.h"
+#include "nsIScrollableFrame.h"
+#include "nsIScrollbarMediator.h"
+#include "nsIStatefulFrame.h"
+#include "nsThreadUtils.h"
+#include "nsIReflowCallback.h"
+#include "nsQueryFrame.h"
+#include "nsExpirationTracker.h"
+#include "TextOverflow.h"
+#include "ScrollVelocityQueue.h"
+#include "mozilla/ScrollTypes.h"
+#include "mozilla/PresState.h"
+#include "mozilla/layout/ScrollAnchorContainer.h"
+#include "mozilla/TypedEnumBits.h"
+
+class nsPresContext;
+class nsIContent;
+class nsAtom;
+class nsIScrollPositionListener;
+class AutoContainsBlendModeCapturer;
+
+namespace mozilla {
+class PresShell;
+struct ScrollReflowInput;
+struct StyleScrollSnapAlign;
+namespace layers {
+class Layer;
+class WebRenderLayerManager;
+} // namespace layers
+namespace layout {
+class ScrollbarActivity;
+} // namespace layout
+
+} // namespace mozilla
+
+/**
+ * The scroll frame creates and manages the scrolling view
+ *
+ * It only supports having a single child frame that typically is an area
+ * frame, but doesn't have to be. The child frame must have a view, though
+ *
+ * Scroll frames don't support incremental changes, i.e. you can't replace
+ * or remove the scrolled frame
+ */
+class nsHTMLScrollFrame : public nsContainerFrame,
+ public nsIScrollableFrame,
+ public nsIAnonymousContentCreator,
+ public nsIReflowCallback,
+ public nsIStatefulFrame {
+ public:
+ using Sides = nsIFrame::Sides;
+ using ScrollbarActivity = mozilla::layout::ScrollbarActivity;
+ using ScrollSnapFlags = mozilla::ScrollSnapFlags;
+ using ScrollTriggeredByScript = mozilla::ScrollTriggeredByScript;
+ using ScrollSnapTargetIds = mozilla::ScrollSnapTargetIds;
+ using FrameMetrics = mozilla::layers::FrameMetrics;
+ using ScrollableLayerGuid = mozilla::layers::ScrollableLayerGuid;
+ using ScrollSnapInfo = mozilla::layers::ScrollSnapInfo;
+ using WebRenderLayerManager = mozilla::layers::WebRenderLayerManager;
+ using APZScrollAnimationType = mozilla::APZScrollAnimationType;
+ using ScrollDirections = mozilla::layers::ScrollDirections;
+ using ScrollDirection = mozilla::layers::ScrollDirection;
+ using Element = mozilla::dom::Element;
+ using SnapTargetSet = nsTHashSet<RefPtr<nsIContent>>;
+ using InScrollingGesture = nsIScrollableFrame::InScrollingGesture;
+
+ using CSSIntPoint = mozilla::CSSIntPoint;
+ using ScrollReflowInput = mozilla::ScrollReflowInput;
+ using ScrollAnchorContainer = mozilla::layout::ScrollAnchorContainer;
+ friend nsHTMLScrollFrame* NS_NewHTMLScrollFrame(
+ mozilla::PresShell* aPresShell, ComputedStyle* aStyle, bool aIsRoot);
+ friend class mozilla::layout::ScrollAnchorContainer;
+
+ NS_DECL_QUERYFRAME
+ NS_DECL_FRAMEARENA_HELPERS(nsHTMLScrollFrame)
+
+ void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+ const nsDisplayListSet& aLists) override;
+
+ bool TryLayout(ScrollReflowInput& aState, ReflowOutput* aKidMetrics,
+ bool aAssumeHScroll, bool aAssumeVScroll, bool aForce);
+
+ // Return true if ReflowScrolledFrame is going to do something different based
+ // on the presence of a horizontal scrollbar in a horizontal writing mode or a
+ // vertical scrollbar in a vertical writing mode.
+ bool ScrolledContentDependsOnBSize(const ScrollReflowInput& aState) const;
+
+ void ReflowScrolledFrame(ScrollReflowInput& aState, bool aAssumeHScroll,
+ bool aAssumeVScroll, ReflowOutput* aMetrics);
+ void ReflowContents(ScrollReflowInput& aState,
+ const ReflowOutput& aDesiredSize);
+ void PlaceScrollArea(ScrollReflowInput& aState,
+ const nsPoint& aScrollPosition);
+
+ // Return the sum of inline-size of the scrollbar gutters (if any) at the
+ // inline-start and inline-end edges of the scroll frame (for a potential
+ // scrollbar that scrolls in the block axis).
+ nscoord IntrinsicScrollbarGutterSizeAtInlineEdges(
+ gfxContext* aRenderingContext);
+
+ bool GetBorderRadii(const nsSize& aFrameSize, const nsSize& aBorderArea,
+ Sides aSkipSides, nscoord aRadii[8]) const final;
+
+ nscoord GetMinISize(gfxContext* aRenderingContext) override;
+ nscoord GetPrefISize(gfxContext* aRenderingContext) override;
+
+ void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus) override;
+ void DidReflow(nsPresContext* aPresContext,
+ const ReflowInput* aReflowInput) override;
+
+ bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas) final;
+
+ BaselineSharingGroup GetDefaultBaselineSharingGroup() const override;
+ nscoord SynthesizeFallbackBaseline(
+ mozilla::WritingMode aWM,
+ BaselineSharingGroup aBaselineGroup) const override;
+ Maybe<nscoord> GetNaturalBaselineBOffset(
+ mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup,
+ BaselineExportContext aExportContext) const override;
+
+ // Recomputes the scrollable overflow area we store in the helper to take
+ // children that are affected by perpsective set on the outer frame and scroll
+ // at different rates.
+ void AdjustForPerspective(nsRect& aScrollableOverflow);
+
+ // Called to set the child frames. We typically have three: the scroll area,
+ // the vertical scrollbar, and the horizontal scrollbar.
+ void SetInitialChildList(ChildListID aListID,
+ nsFrameList&& aChildList) override;
+ void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) final;
+ void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
+ const nsLineList::iterator* aPrevFrameLine,
+ nsFrameList&& aFrameList) final;
+ void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) final;
+
+ void DidSetComputedStyle(ComputedStyle* aOldComputedStyle) final;
+
+ void Destroy(DestroyContext&) override;
+
+ nsIScrollableFrame* GetScrollTargetFrame() const final {
+ return const_cast<nsHTMLScrollFrame*>(this);
+ }
+
+ nsContainerFrame* GetContentInsertionFrame() override {
+ return GetScrolledFrame()->GetContentInsertionFrame();
+ }
+
+ nsPoint GetPositionOfChildIgnoringScrolling(const nsIFrame* aChild) final {
+ nsPoint pt = aChild->GetPosition();
+ if (aChild == GetScrolledFrame()) {
+ pt += GetScrollPosition();
+ }
+ return pt;
+ }
+
+ // nsIAnonymousContentCreator
+ nsresult CreateAnonymousContent(nsTArray<ContentInfo>&) final;
+ void AppendAnonymousContentTo(nsTArray<nsIContent*>&, uint32_t aFilter) final;
+
+ // nsIScrollableFrame
+ nsIFrame* GetScrolledFrame() const final { return mScrolledFrame; }
+ mozilla::ScrollStyles GetScrollStyles() const final;
+ bool IsForTextControlWithNoScrollbars() const final;
+ bool HasAllNeededScrollbars() const final {
+ return GetCurrentAnonymousContent().contains(GetNeededAnonymousContent());
+ }
+
+ mozilla::layers::OverscrollBehaviorInfo GetOverscrollBehaviorInfo()
+ const final;
+ ScrollDirections GetAvailableScrollingDirectionsForUserInputEvents()
+ const final;
+ ScrollDirections GetScrollbarVisibility() const final {
+ ScrollDirections result;
+ if (mHasHorizontalScrollbar) {
+ result += ScrollDirection::eHorizontal;
+ }
+ if (mHasVerticalScrollbar) {
+ result += ScrollDirection::eVertical;
+ }
+ return result;
+ }
+ nsMargin GetActualScrollbarSizes(
+ nsIScrollableFrame::ScrollbarSizesOptions aOptions =
+ nsIScrollableFrame::ScrollbarSizesOptions::NONE) const final;
+ nsMargin GetDesiredScrollbarSizes() const final;
+ nsSize GetLayoutSize() const final {
+ if (mIsUsingMinimumScaleSize) {
+ return mICBSize;
+ }
+ return mScrollPort.Size();
+ }
+ /**
+ * GetScrolledRect is designed to encapsulate deciding which
+ * directions of overflow should be reachable by scrolling and which
+ * should not. Callers should NOT depend on it having any particular
+ * behavior.
+ *
+ * This should only be called when the scrolled frame has been
+ * reflowed with the scroll port size given in mScrollPort.
+ *
+ * Currently it allows scrolling down and to the right for
+ * nsHTMLScrollFrames with LTR directionality, and allows scrolling down and
+ * to the left for nsHTMLScrollFrames with RTL directionality.
+ */
+ nsRect GetScrolledRect() const final;
+ nsRect GetScrollPortRect() const final { return mScrollPort; }
+ nsPoint GetScrollPosition() const final {
+ return mScrollPort.TopLeft() - mScrolledFrame->GetPosition();
+ }
+ /**
+ * For LTR frames, the logical scroll position is the offset of the top left
+ * corner of the frame from the top left corner of the scroll port (same as
+ * GetScrollPosition).
+ * For RTL frames, it is the offset of the top right corner of the frame from
+ * the top right corner of the scroll port
+ */
+ nsPoint GetLogicalScrollPosition() const final {
+ nsPoint pt;
+ pt.x = IsPhysicalLTR()
+ ? mScrollPort.x - mScrolledFrame->GetPosition().x
+ : mScrollPort.XMost() - mScrolledFrame->GetRect().XMost();
+ pt.y = mScrollPort.y - mScrolledFrame->GetPosition().y;
+ return pt;
+ }
+
+ nsRect GetScrollRange() const final { return GetLayoutScrollRange(); }
+ nsSize GetVisualViewportSize() const final;
+ nsPoint GetVisualViewportOffset() const final;
+ bool SetVisualViewportOffset(const nsPoint& aOffset, bool aRepaint) final;
+ nsRect GetVisualScrollRange() const final;
+ nsRect GetScrollRangeForUserInputEvents() const final;
+ nsSize GetLineScrollAmount() const final;
+ nsSize GetPageScrollAmount() const final;
+ nsMargin GetScrollPadding() const final;
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode,
+ const nsRect* aRange = nullptr,
+ ScrollSnapFlags aSnapFlags = ScrollSnapFlags::Disabled,
+ ScrollTriggeredByScript aTriggeredByScript =
+ ScrollTriggeredByScript::No) final {
+ return ScrollToInternal(aScrollPosition, aMode, ScrollOrigin::Other, aRange,
+ aSnapFlags, aTriggeredByScript);
+ }
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
+ ScrollMode aMode = ScrollMode::Instant) final;
+ void ScrollToCSSPixelsForApz(const mozilla::CSSPoint& aScrollPosition,
+ ScrollSnapTargetIds&& aLastSnapTargetIds) final;
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ CSSIntPoint GetScrollPositionCSSPixels() final;
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void ScrollBy(nsIntPoint aDelta, mozilla::ScrollUnit aUnit, ScrollMode aMode,
+ nsIntPoint* aOverflow,
+ ScrollOrigin aOrigin = ScrollOrigin::NotSpecified,
+ nsIScrollableFrame::ScrollMomentum aMomentum =
+ nsIScrollableFrame::NOT_MOMENTUM,
+ ScrollSnapFlags aSnapFlags = ScrollSnapFlags::Disabled) final;
+ void ScrollByCSSPixels(const CSSIntPoint& aDelta,
+ ScrollMode aMode = ScrollMode::Instant) final {
+ return ScrollByCSSPixelsInternal(aDelta, aMode);
+ }
+ void ScrollByCSSPixelsInternal(
+ const CSSIntPoint& aDelta, ScrollMode aMode = ScrollMode::Instant,
+ // This ScrollByCSSPixels is mainly used for Element.scrollBy and
+ // Window.scrollBy. An exception is the transmogrification of
+ // ScrollToCSSPixels.
+ ScrollSnapFlags aSnapFlags = ScrollSnapFlags::IntendedDirection |
+ ScrollSnapFlags::IntendedEndPosition);
+
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void ScrollToRestoredPosition() final;
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void CurPosAttributeChanged(nsIContent* aChild) final {
+ return CurPosAttributeChangedInternal(aChild);
+ }
+ NS_IMETHOD PostScrolledAreaEventForCurrentArea() final {
+ PostScrolledAreaEvent();
+ return NS_OK;
+ }
+ bool IsScrollingActive() const final;
+ bool IsMaybeAsynchronouslyScrolled() const final {
+ // If this is true, then we'll build an ASR, and that's what we want
+ // to know I think.
+ return mWillBuildScrollableLayer;
+ }
+
+ bool DidHistoryRestore() const final { return mDidHistoryRestore; }
+ void ClearDidHistoryRestore() final { mDidHistoryRestore = false; }
+ void MarkEverScrolled() final;
+ bool IsRectNearlyVisible(const nsRect& aRect) const final;
+ nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const final;
+ ScrollOrigin LastScrollOrigin() const final { return mLastScrollOrigin; }
+ using AnimationState = nsIScrollableFrame::AnimationState;
+ mozilla::EnumSet<AnimationState> ScrollAnimationState() const final;
+ mozilla::MainThreadScrollGeneration CurrentScrollGeneration() const final {
+ return mScrollGeneration;
+ }
+ mozilla::APZScrollGeneration ScrollGenerationOnApz() const final {
+ return mScrollGenerationOnApz;
+ }
+ nsPoint LastScrollDestination() final { return mDestination; }
+ nsTArray<mozilla::ScrollPositionUpdate> GetScrollUpdates() const final;
+ bool HasScrollUpdates() const final { return !mScrollUpdates.IsEmpty(); }
+ void ResetScrollInfoIfNeeded(
+ const mozilla::MainThreadScrollGeneration& aGeneration,
+ const mozilla::APZScrollGeneration& aGenerationOnApz,
+ mozilla::APZScrollAnimationType aAPZScrollAnimationType,
+ InScrollingGesture aInScrollingGesture) final;
+ bool WantAsyncScroll() const final;
+ mozilla::Maybe<mozilla::layers::ScrollMetadata> ComputeScrollMetadata(
+ mozilla::layers::WebRenderLayerManager* aLayerManager,
+ const nsIFrame* aItemFrame,
+ const nsPoint& aOffsetToReferenceFrame) const final;
+ void MarkScrollbarsDirtyForReflow() const final;
+ void InvalidateScrollbars() const final;
+
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ * Update scrollbar curpos attributes to reflect current scroll position
+ */
+ void UpdateScrollbarPosition() final;
+ bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
+ nsRect* aVisibleRect, nsRect* aDirtyRect,
+ bool aSetBase) final {
+ return DecideScrollableLayer(aBuilder, aVisibleRect, aDirtyRect, aSetBase,
+ nullptr);
+ }
+ void NotifyApzTransaction() final;
+ void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort) final;
+ bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
+ nsRect* aDisplayPort) final;
+ void TriggerDisplayPortExpiration() final;
+
+ // nsIStatefulFrame
+ mozilla::UniquePtr<mozilla::PresState> SaveState() final;
+ NS_IMETHOD RestoreState(mozilla::PresState* aState) final;
+
+ // nsIScrollbarMediator
+ void ScrollByPage(
+ nsScrollbarFrame* aScrollbar, int32_t aDirection,
+ ScrollSnapFlags aSnapFlags = ScrollSnapFlags::Disabled) final;
+ void ScrollByWhole(
+ nsScrollbarFrame* aScrollbar, int32_t aDirection,
+ ScrollSnapFlags aSnapFlags = ScrollSnapFlags::Disabled) final;
+ void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
+ ScrollSnapFlags = ScrollSnapFlags::Disabled) final;
+ void ScrollByUnit(nsScrollbarFrame* aScrollbar, ScrollMode aMode,
+ int32_t aDirection, mozilla::ScrollUnit aUnit,
+ ScrollSnapFlags = ScrollSnapFlags::Disabled) final;
+ void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) final;
+ void ThumbMoved(nsScrollbarFrame* aScrollbar, nscoord aOldPos,
+ nscoord aNewPos) final;
+ void ScrollbarReleased(nsScrollbarFrame* aScrollbar) final;
+ void VisibilityChanged(bool aVisible) final {}
+ nsScrollbarFrame* GetScrollbarBox(bool aVertical) final {
+ return aVertical ? mVScrollbarBox : mHScrollbarBox;
+ }
+
+ void ScrollbarActivityStarted() const final;
+ void ScrollbarActivityStopped() const final;
+
+ bool IsScrollbarOnRight() const final;
+
+ bool ShouldSuppressScrollbarRepaints() const final {
+ return mSuppressScrollbarRepaints;
+ }
+ void SetTransformingByAPZ(bool aTransforming) final;
+ bool IsTransformingByAPZ() const final { return mTransformingByAPZ; }
+ void SetScrollableByAPZ(bool aScrollable) final;
+ void SetZoomableByAPZ(bool aZoomable) final;
+ void SetHasOutOfFlowContentInsideFilter() final;
+ ScrollSnapInfo GetScrollSnapInfo() final;
+
+ void TryResnap() final;
+ void PostPendingResnapIfNeeded(const nsIFrame* aFrame) final;
+ void PostPendingResnap() final;
+ using PhysicalScrollSnapAlign = nsIScrollableFrame::PhysicalScrollSnapAlign;
+ PhysicalScrollSnapAlign GetScrollSnapAlignFor(
+ const nsIFrame* aFrame) const final;
+
+ bool DragScroll(mozilla::WidgetEvent* aEvent) final;
+
+ void AsyncScrollbarDragInitiated(
+ uint64_t aDragBlockId, mozilla::layers::ScrollDirection aDirection) final;
+
+ void AsyncScrollbarDragRejected() final;
+
+ bool IsRootScrollFrameOfDocument() const final { return mIsRoot; }
+
+ Maybe<uint32_t> IsFirstScrollableFrameSequenceNumber() const final {
+ return mIsFirstScrollableFrameSequenceNumber;
+ }
+
+ void SetIsFirstScrollableFrameSequenceNumber(Maybe<uint32_t> aValue) final {
+ mIsFirstScrollableFrameSequenceNumber = aValue;
+ }
+
+ const ScrollAnchorContainer* Anchor() const final { return &mAnchor; }
+ ScrollAnchorContainer* Anchor() final { return &mAnchor; }
+
+ // Return the scrolled frame.
+ void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) final {
+ aResult.AppendElement(OwnedAnonBox(GetScrolledFrame()));
+ }
+
+ bool SmoothScrollVisual(
+ const nsPoint& aVisualViewportOffset,
+ mozilla::layers::FrameMetrics::ScrollOffsetUpdateType aUpdateType) final;
+
+ bool IsSmoothScroll(mozilla::dom::ScrollBehavior aBehavior) const final;
+
+#ifdef DEBUG_FRAME_DUMP
+ nsresult GetFrameName(nsAString& aResult) const override;
+#endif
+
+#ifdef ACCESSIBILITY
+ mozilla::a11y::AccType AccessibleType() override;
+#endif
+
+ protected:
+ nsHTMLScrollFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
+ bool aIsRoot)
+ : nsHTMLScrollFrame(aStyle, aPresContext, kClassID, aIsRoot) {}
+ nsHTMLScrollFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
+ nsIFrame::ClassID aID, bool aIsRoot);
+ ~nsHTMLScrollFrame();
+ void SetSuppressScrollbarUpdate(bool aSuppress) {
+ mSuppressScrollbarUpdate = aSuppress;
+ }
+ bool GuessHScrollbarNeeded(const ScrollReflowInput& aState);
+ bool GuessVScrollbarNeeded(const ScrollReflowInput& aState);
+
+ bool IsScrollbarUpdateSuppressed() const { return mSuppressScrollbarUpdate; }
+
+ // Return whether we're in an "initial" reflow. Some reflows with
+ // NS_FRAME_FIRST_REFLOW set are NOT "initial" as far as we're concerned.
+ bool InInitialReflow() const;
+
+ /**
+ * Override this to return false if computed bsize/min-bsize/max-bsize
+ * should NOT be propagated to child content.
+ * nsListControlFrame uses this.
+ */
+ virtual bool ShouldPropagateComputedBSizeToScrolledContent() const {
+ return true;
+ }
+
+ private:
+ class AsyncScroll;
+ class AsyncSmoothMSDScroll;
+
+ enum class AnonymousContentType {
+ VerticalScrollbar,
+ HorizontalScrollbar,
+ Resizer,
+ };
+ mozilla::EnumSet<AnonymousContentType> GetNeededAnonymousContent() const;
+ mozilla::EnumSet<AnonymousContentType> GetCurrentAnonymousContent() const;
+
+ // If a child frame was added or removed on the scrollframe,
+ // reload our child frame list.
+ // We need this if a scrollbar frame is recreated.
+ void ReloadChildFrames();
+
+ public:
+ enum class OverflowState : uint32_t {
+ None = 0,
+ Vertical = (1 << 0),
+ Horizontal = (1 << 1),
+ };
+
+ protected:
+ OverflowState GetOverflowState() const;
+
+ MOZ_CAN_RUN_SCRIPT nsresult FireScrollPortEvent();
+ void PostScrollEndEvent();
+ MOZ_CAN_RUN_SCRIPT void FireScrollEndEvent();
+ void PostOverflowEvent();
+
+ // Add display items for the top-layer (which includes things like
+ // the fullscreen element, its backdrop, and text selection carets)
+ // to |aLists|.
+ // This is a no-op for scroll frames other than the viewport's
+ // root scroll frame.
+ // This should be called with an nsDisplayListSet that will be
+ // wrapped in the async zoom container, if we're building one.
+ // It should not be called with an ASR setter on the stack, as the
+ // top-layer items handle setting up their own ASRs.
+ void MaybeCreateTopLayerAndWrapRootItems(
+ nsDisplayListBuilder*, mozilla::nsDisplayListCollection&,
+ bool aCreateAsyncZoom,
+ AutoContainsBlendModeCapturer* aAsyncZoomBlendCapture,
+ const nsRect& aAsyncZoomClipRect, nscoord* aRadii);
+
+ void AppendScrollPartsTo(nsDisplayListBuilder* aBuilder,
+ const nsDisplayListSet& aLists, bool aCreateLayer,
+ bool aPositioned);
+
+ // nsIReflowCallback
+ bool ReflowFinished() final;
+ void ReflowCallbackCanceled() final;
+
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ * Called when the 'curpos' attribute on one of the scrollbars changes.
+ */
+ void CurPosAttributeChangedInternal(nsIContent*, bool aDoScroll = true);
+
+ void PostScrollEvent(bool aDelayed = false);
+ MOZ_CAN_RUN_SCRIPT void FireScrollEvent();
+ void PostScrolledAreaEvent();
+ MOZ_CAN_RUN_SCRIPT void FireScrolledAreaEvent();
+
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void FinishReflowForScrollbar(Element* aElement, nscoord aMinXY,
+ nscoord aMaxXY, nscoord aCurPosXY,
+ nscoord aPageIncrement, nscoord aIncrement);
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void SetScrollbarEnabled(Element* aElement, nscoord aMaxPos);
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void SetCoordAttribute(Element* aElement, nsAtom* aAtom, nscoord aSize);
+
+ nscoord GetCoordAttribute(nsIFrame* aFrame, nsAtom* aAtom,
+ nscoord aDefaultValue, nscoord* aRangeStart,
+ nscoord* aRangeLength);
+
+ nsRect GetLayoutScrollRange() const;
+ // Get the scroll range assuming the viewport has size (aWidth, aHeight).
+ nsRect GetScrollRange(nscoord aWidth, nscoord aHeight) const;
+
+ const nsRect& ScrollPort() const { return mScrollPort; }
+ void SetScrollPort(const nsRect& aNewScrollPort) {
+ if (!mScrollPort.IsEqualEdges(aNewScrollPort)) {
+ mMayScheduleScrollAnimations = true;
+ }
+ mScrollPort = aNewScrollPort;
+ }
+
+ /**
+ * Return the 'optimal viewing region' as a rect suitable for use by
+ * scroll anchoring. This rect is in the same coordinate space as
+ * 'GetScrollPortRect', and accounts for 'scroll-padding' as defined by:
+ *
+ * https://drafts.csswg.org/css-scroll-snap-1/#optimal-viewing-region
+ */
+ nsRect GetVisualOptimalViewingRect() const;
+
+ /**
+ * For LTR frames, this is the same as GetVisualViewportOffset().
+ * For RTL frames, we take the offset from the top right corner of the frame
+ * to the top right corner of the visual viewport.
+ */
+ nsPoint GetLogicalVisualViewportOffset() const {
+ nsPoint pt = GetVisualViewportOffset();
+ if (!IsPhysicalLTR()) {
+ pt.x += GetVisualViewportSize().width - mScrolledFrame->GetRect().width;
+ }
+ return pt;
+ }
+ void ScrollSnap() final { return ScrollSnap(ScrollMode::SmoothMsd); }
+ void ScrollSnap(ScrollMode aMode);
+ void ScrollSnap(const nsPoint& aDestination,
+ ScrollMode aMode = ScrollMode::SmoothMsd);
+
+ bool HasPendingScrollRestoration() const {
+ return mRestorePos != nsPoint(-1, -1);
+ }
+
+ bool IsProcessingScrollEvent() const { return mProcessingScrollEvent; }
+
+ public:
+ static void AsyncScrollCallback(nsHTMLScrollFrame* aInstance,
+ mozilla::TimeStamp aTime);
+ static void AsyncSmoothMSDScrollCallback(nsHTMLScrollFrame* aInstance,
+ mozilla::TimeDuration aDeltaTime);
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ * aRange is the range of allowable scroll positions around the desired
+ * aScrollPosition. Null means only aScrollPosition is allowed.
+ * This is a closed-ended range --- aRange.XMost()/aRange.YMost() are allowed.
+ */
+ void ScrollToInternal(
+ nsPoint aScrollPosition, ScrollMode aMode,
+ ScrollOrigin aOrigin = ScrollOrigin::NotSpecified,
+ const nsRect* aRange = nullptr,
+ ScrollSnapFlags aSnapFlags = ScrollSnapFlags::Disabled,
+ ScrollTriggeredByScript aTriggeredByScript = ScrollTriggeredByScript::No);
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ */
+ void ScrollToImpl(
+ nsPoint aPt, const nsRect& aRange,
+ ScrollOrigin aOrigin = ScrollOrigin::NotSpecified,
+ ScrollTriggeredByScript aTriggeredByScript = ScrollTriggeredByScript::No);
+ void ScrollVisual();
+
+ enum class LoadingState { Loading, Stopped, Loaded };
+
+ LoadingState GetPageLoadingState();
+
+ /**
+ * GetSnapPointForDestination determines which point to snap to after
+ * scrolling. aStartPos gives the position before scrolling and aDestination
+ * gives the position after scrolling, with no snapping. Behaviour is
+ * dependent on the value of aUnit.
+ * Returns true if a suitable snap point could be found and aDestination has
+ * been updated to a valid snapping position.
+ */
+ Maybe<mozilla::SnapTarget> GetSnapPointForDestination(
+ mozilla::ScrollUnit aUnit, ScrollSnapFlags aFlags,
+ const nsPoint& aStartPos, const nsPoint& aDestination);
+
+ Maybe<mozilla::SnapTarget> GetSnapPointForResnap();
+ bool NeedsResnap();
+
+ void SetLastSnapTargetIds(mozilla::UniquePtr<ScrollSnapTargetIds> aId);
+ void AddScrollPositionListener(nsIScrollPositionListener* aListener) final {
+ mListeners.AppendElement(aListener);
+ }
+ void RemoveScrollPositionListener(
+ nsIScrollPositionListener* aListener) final {
+ mListeners.RemoveElement(aListener);
+ }
+
+ static void SetScrollbarVisibility(nsIFrame* aScrollbar, bool aVisible);
+
+ /**
+ * GetUnsnappedScrolledRectInternal is designed to encapsulate deciding which
+ * directions of overflow should be reachable by scrolling and which
+ * should not. Callers should NOT depend on it having any particular
+ * behavior.
+ *
+ * Currently it allows scrolling down and to the right for
+ * nsHTMLScrollFrames with LTR directionality, and allows scrolling down and
+ * to the left for nsHTMLScrollFrames with RTL directionality.
+ */
+ nsRect GetUnsnappedScrolledRectInternal(const nsRect& aScrolledOverflowArea,
+ const nsSize& aScrollPortSize) const;
+
+ bool IsPhysicalLTR() const { return GetWritingMode().IsPhysicalLTR(); }
+ bool IsBidiLTR() const { return GetWritingMode().IsBidiLTR(); }
+
+ private:
+ // NOTE: Use GetScrollStylesFromFrame() if you want to know `overflow`
+ // and `overflow-behavior` properties.
+ nsIFrame* GetFrameForStyle() const;
+
+ // Compute all scroll snap related information and store eash snap target
+ // element in |mSnapTargets|.
+ ScrollSnapInfo ComputeScrollSnapInfo();
+
+ bool NeedsScrollSnap() const;
+
+ // Returns the snapport size of this scroll container.
+ // https://drafts.csswg.org/css-scroll-snap/#scroll-snapport
+ nsSize GetSnapportSize() const;
+
+ // Schedule the scroll-driven animations.
+ void ScheduleScrollAnimations();
+ void TryScheduleScrollAnimations() {
+ if (!mMayScheduleScrollAnimations) {
+ return;
+ }
+ ScheduleScrollAnimations();
+ mMayScheduleScrollAnimations = false;
+ }
+
+ public:
+ void UpdateSticky();
+
+ void UpdatePrevScrolledRect();
+
+ // adjust the scrollbar rectangle aRect to account for any visible resizer.
+ // aHasResizer specifies if there is a content resizer, however this method
+ // will also check if a widget resizer is present as well.
+ void AdjustScrollbarRectForResizer(
+ nsIFrame* aFrame, nsPresContext* aPresContext, nsRect& aRect,
+ bool aHasResizer, mozilla::layers::ScrollDirection aDirection);
+ void LayoutScrollbars(ScrollReflowInput& aState,
+ const nsRect& aInsideBorderArea,
+ const nsRect& aOldScrollPort);
+
+ void LayoutScrollbarPartAtRect(const ScrollReflowInput&,
+ ReflowInput& aKidReflowInput, const nsRect&);
+
+ bool IsAlwaysActive() const;
+ void MarkRecentlyScrolled();
+ void MarkNotRecentlyScrolled();
+ nsExpirationState* GetExpirationState() { return &mActivityExpirationState; }
+
+ bool UsesOverlayScrollbars() const;
+ bool IsLastSnappedTarget(const nsIFrame* aFrame) const;
+
+ static bool ShouldActivateAllScrollFrames();
+ nsRect RestrictToRootDisplayPort(const nsRect& aDisplayportBase);
+ bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
+ nsRect* aVisibleRect, nsRect* aDirtyRect,
+ bool aSetBase,
+ bool* aDirtyRectHasBeenOverriden = nullptr);
+ bool AllowDisplayPortExpiration();
+ void ResetDisplayPortExpiryTimer();
+
+ void ScheduleSyntheticMouseMove();
+ static void ScrollActivityCallback(nsITimer* aTimer, void* anInstance);
+
+ void HandleScrollbarStyleSwitching();
+
+ bool IsApzAnimationInProgress() const {
+ return mCurrentAPZScrollAnimationType != APZScrollAnimationType::No;
+ }
+ nsPoint LastScrollDestination() const { return mDestination; }
+
+ bool IsLastScrollUpdateAnimating() const;
+ bool IsLastScrollUpdateTriggeredByScriptAnimating() const;
+
+ // Update minimum-scale size. The minimum-scale size will be set/used only
+ // if there is overflow-x:hidden region.
+ void UpdateMinimumScaleSize(const nsRect& aScrollableOverflow,
+ const nsSize& aICBSize);
+
+ // Return the scroll frame's "true outer size".
+ // This is GetSize(), except when we've been sized to reflect a virtual
+ // (layout) viewport in which case this returns the outer size used to size
+ // the physical (visual) viewport.
+ nsSize TrueOuterSize(nsDisplayListBuilder* aBuilder) const;
+
+ already_AddRefed<Element> MakeScrollbar(mozilla::dom::NodeInfo* aNodeInfo,
+ bool aVertical,
+ mozilla::AnonymousContentKey& aKey);
+
+ void AppendScrollUpdate(const mozilla::ScrollPositionUpdate& aUpdate);
+
+ // owning references to the nsIAnonymousContentCreator-built content
+ nsCOMPtr<Element> mHScrollbarContent;
+ nsCOMPtr<Element> mVScrollbarContent;
+ nsCOMPtr<Element> mScrollCornerContent;
+ nsCOMPtr<Element> mResizerContent;
+
+ class ScrollEvent;
+ class ScrollEndEvent;
+ class AsyncScrollPortEvent;
+ class ScrolledAreaEvent;
+
+ RefPtr<ScrollEvent> mScrollEvent;
+ RefPtr<ScrollEndEvent> mScrollEndEvent;
+ nsRevocableEventPtr<AsyncScrollPortEvent> mAsyncScrollPortEvent;
+ nsRevocableEventPtr<ScrolledAreaEvent> mScrolledAreaEvent;
+ nsScrollbarFrame* mHScrollbarBox;
+ nsScrollbarFrame* mVScrollbarBox;
+ nsIFrame* mScrolledFrame;
+ nsIFrame* mScrollCornerBox;
+ nsIFrame* mResizerBox;
+ const nsIFrame* mReferenceFrameDuringPainting;
+ RefPtr<AsyncScroll> mAsyncScroll;
+ RefPtr<AsyncSmoothMSDScroll> mAsyncSmoothMSDScroll;
+ RefPtr<ScrollbarActivity> mScrollbarActivity;
+ nsTArray<nsIScrollPositionListener*> mListeners;
+ ScrollOrigin mLastScrollOrigin;
+ Maybe<nsPoint> mApzSmoothScrollDestination;
+ mozilla::MainThreadScrollGeneration mScrollGeneration;
+ mozilla::APZScrollGeneration mScrollGenerationOnApz;
+
+ nsTArray<mozilla::ScrollPositionUpdate> mScrollUpdates;
+
+ nsSize mMinimumScaleSize;
+
+ // Stores the ICB size for the root document if this frame is using the
+ // minimum scale size for |mScrollPort|.
+ nsSize mICBSize;
+
+ // Where we're currently scrolling to, if we're scrolling asynchronously.
+ // If we're not in the middle of an asynchronous scroll then this is
+ // just the current scroll position. ScrollBy will choose its
+ // destination based on this value.
+ nsPoint mDestination;
+
+ // A goal position to try to scroll to as content loads. As long as mLastPos
+ // matches the current logical scroll position, we try to scroll to
+ // mRestorePos after every reflow --- because after each time content is
+ // loaded/added to the scrollable element, there will be a reflow.
+ // Note that for frames where layout and visual viewport aren't one and the
+ // same thing, this scroll position will be the logical scroll position of
+ // the *visual* viewport, as its position will be more relevant to the user.
+ nsPoint mRestorePos;
+ // The last logical position we scrolled to while trying to restore
+ // mRestorePos, or 0,0 when this is a new frame. Set to -1,-1 once we've
+ // scrolled for any reason other than trying to restore mRestorePos.
+ // Just as with mRestorePos, this position will be the logical position of
+ // the *visual* viewport where available.
+ nsPoint mLastPos;
+
+ // The latest scroll position we've sent or received from APZ. This
+ // represents the main thread's best knowledge of the APZ scroll position,
+ // and is used to calculate relative scroll offset updates.
+ nsPoint mApzScrollPos;
+
+ nsExpirationState mActivityExpirationState;
+
+ nsCOMPtr<nsITimer> mScrollActivityTimer;
+
+ // The scroll position where we last updated frame visibility.
+ nsPoint mLastUpdateFramesPos;
+ nsRect mDisplayPortAtLastFrameUpdate;
+
+ nsRect mPrevScrolledRect;
+
+ ScrollableLayerGuid::ViewID mScrollParentID;
+
+ // Timer to remove the displayport some time after scrolling has stopped
+ nsCOMPtr<nsITimer> mDisplayPortExpiryTimer;
+
+ ScrollAnchorContainer mAnchor;
+
+ // We keep holding a strong reference for each snap target element until the
+ // next snapping happens so that it avoids using the same nsIContent* pointer
+ // for newly created contents in this scroll container. Otherwise we will try
+ // to match different nsIContent(s) generated at the same address during
+ // re-snapping.
+ SnapTargetSet mSnapTargets;
+
+ // Representing there's an APZ animation is in progress and what caused the
+ // animation. Note that this is only set when repainted via APZ, which means
+ // that there may be a request for an APZ animation in flight for example,
+ // while this is still `No`. In order to answer "is an APZ animation in the
+ // process of starting or in progress" you need to check mScrollUpdates,
+ // mApzAnimationRequested, and this type.
+ APZScrollAnimationType mCurrentAPZScrollAnimationType;
+
+ // The paint sequence number if the scroll frame is the first scrollable frame
+ // encountered.
+ Maybe<uint32_t> mIsFirstScrollableFrameSequenceNumber;
+
+ // Representing whether the APZC corresponding to this frame is now in the
+ // middle of handling a gesture (e.g. a pan gesture).
+ InScrollingGesture mInScrollingGesture : 1;
+
+ bool mAllowScrollOriginDowngrade : 1;
+ bool mHadDisplayPortAtLastFrameUpdate : 1;
+
+ // True if the most recent reflow of the scroll container frame has
+ // the vertical scrollbar shown.
+ bool mHasVerticalScrollbar : 1;
+ // True if the most recent reflow of the scroll container frame has the
+ // horizontal scrollbar shown.
+ bool mHasHorizontalScrollbar : 1;
+
+ // If mHas(Vertical|Horizontal)Scrollbar is true then
+ // mOnlyNeed(V|H)ScrollbarToScrollVVInsideLV indicates if the only reason we
+ // need that scrollbar is to scroll the visual viewport inside the layout
+ // viewport. These scrollbars are special in that even if they are layout
+ // scrollbars they do not take up any layout space.
+ bool mOnlyNeedVScrollbarToScrollVVInsideLV : 1;
+ bool mOnlyNeedHScrollbarToScrollVVInsideLV : 1;
+ bool mFrameIsUpdatingScrollbar : 1;
+ bool mDidHistoryRestore : 1;
+ // Is this the scrollframe for the document's viewport?
+ bool mIsRoot : 1;
+ // If true, don't try to layout the scrollbars in Reflow(). This can be
+ // useful if multiple passes are involved, because we don't want to place the
+ // scrollbars at the wrong size.
+ bool mSuppressScrollbarUpdate : 1;
+ // If true, we skipped a scrollbar layout due to mSuppressScrollbarUpdate
+ // being set at some point. That means we should lay out scrollbars even if
+ // it might not strictly be needed next time mSuppressScrollbarUpdate is
+ // false.
+ bool mSkippedScrollbarLayout : 1;
+
+ bool mHadNonInitialReflow : 1;
+ // Initially true; first call to ReflowFinished() sets it to false.
+ bool mFirstReflow : 1;
+ // State used only by PostScrollEvents so we know
+ // which overflow states have changed.
+ bool mHorizontalOverflow : 1;
+ bool mVerticalOverflow : 1;
+ bool mPostedReflowCallback : 1;
+ bool mMayHaveDirtyFixedChildren : 1;
+ // If true, need to actually update our scrollbar attributes in the
+ // reflow callback.
+ bool mUpdateScrollbarAttributes : 1;
+ // If true, we should be prepared to scroll using this scrollframe
+ // by placing descendant content into its own layer(s)
+ bool mHasBeenScrolledRecently : 1;
+
+ // If true, the scroll frame should always be active because we always build
+ // a scrollable layer. Used for asynchronous scrolling.
+ bool mWillBuildScrollableLayer : 1;
+
+ // If true, the scroll frame is an ancestor of other "active" scrolling
+ // frames, where "active" means has a non-minimal display port if
+ // ShouldActivateAllScrollFrames is true, or has a display port if
+ // ShouldActivateAllScrollFrames is false. And this means that we shouldn't
+ // expire the display port (if ShouldActivateAllScrollFrames is true then
+ // expiring a display port means making it minimal, otherwise it means
+ // removing the display port). If those descendant scrollframes have their
+ // display ports removed or made minimal, then we expire our display port.
+ bool mIsParentToActiveScrollFrames : 1;
+
+ // True if this frame has been scrolled at least once
+ bool mHasBeenScrolled : 1;
+
+ // True if the events synthesized by OSX to produce momentum scrolling should
+ // be ignored. Reset when the next real, non-synthesized scroll event occurs.
+ bool mIgnoreMomentumScroll : 1;
+
+ // True if the APZ is in the process of async-transforming this scrollframe,
+ // (as best as we can tell on the main thread, anyway).
+ bool mTransformingByAPZ : 1;
+
+ // True if APZ can scroll this frame asynchronously (i.e. it has an APZC
+ // set up for this frame and it's not a scrollinfo layer).
+ bool mScrollableByAPZ : 1;
+
+ // True if the APZ is allowed to zoom this scrollframe.
+ bool mZoomableByAPZ : 1;
+
+ // True if the scroll frame contains out-of-flow content and is inside
+ // a CSS filter.
+ bool mHasOutOfFlowContentInsideFilter : 1;
+
+ // True if we don't want the scrollbar to repaint itself right now.
+ bool mSuppressScrollbarRepaints : 1;
+
+ // True if we are using the minimum scale size instead of ICB for scroll port.
+ bool mIsUsingMinimumScaleSize : 1;
+
+ // True if the minimum scale size has been changed since the last reflow.
+ bool mMinimumScaleSizeChanged : 1;
+
+ // True if we're processing an scroll event.
+ bool mProcessingScrollEvent : 1;
+
+ // This is true from the time a scroll animation is requested of APZ to the
+ // time that APZ responds with an up-to-date repaint request. More precisely,
+ // this is flipped to true if a repaint request is dispatched to APZ where
+ // the most recent scroll request is a smooth scroll, and it is cleared when
+ // mApzAnimationInProgress is updated.
+ bool mApzAnimationRequested : 1;
+
+ // Similar to above mApzAnimationRequested but the request came from script,
+ // e.g., scrollBy().
+ bool mApzAnimationTriggeredByScriptRequested : 1;
+
+ // Whether we need to reclamp the visual viewport offset in ReflowFinished.
+ bool mReclampVVOffsetInReflowFinished : 1;
+
+ // Whether we need to schedule the scroll-driven animations.
+ bool mMayScheduleScrollAnimations : 1;
+
+#ifdef MOZ_WIDGET_ANDROID
+ // True if this scrollable frame was vertically overflowed on the last reflow.
+ bool mHasVerticalOverflowForDynamicToolbar : 1;
+#endif
+
+ mozilla::layout::ScrollVelocityQueue mVelocityQueue;
+
+ protected:
+ class AutoScrollbarRepaintSuppression;
+ friend class AutoScrollbarRepaintSuppression;
+ class AutoScrollbarRepaintSuppression {
+ public:
+ AutoScrollbarRepaintSuppression(nsHTMLScrollFrame* aFrame,
+ AutoWeakFrame& aWeakOuter, bool aSuppress)
+ : mFrame(aFrame),
+ mWeakOuter(aWeakOuter),
+ mOldSuppressValue(aFrame->mSuppressScrollbarRepaints) {
+ mFrame->mSuppressScrollbarRepaints = aSuppress;
+ }
+
+ ~AutoScrollbarRepaintSuppression() {
+ if (mWeakOuter.IsAlive()) {
+ mFrame->mSuppressScrollbarRepaints = mOldSuppressValue;
+ }
+ }
+
+ private:
+ nsHTMLScrollFrame* mFrame;
+ AutoWeakFrame& mWeakOuter;
+ bool mOldSuppressValue;
+ };
+
+ struct ScrollOperationParams {
+ ScrollOperationParams(const ScrollOperationParams&) = delete;
+ ScrollOperationParams(ScrollMode aMode, ScrollOrigin aOrigin)
+ : mMode(aMode), mOrigin(aOrigin) {}
+ ScrollOperationParams(ScrollMode aMode, ScrollOrigin aOrigin,
+ ScrollSnapTargetIds&& aSnapTargetIds)
+ : ScrollOperationParams(aMode, aOrigin) {
+ mTargetIds = std::move(aSnapTargetIds);
+ }
+ ScrollOperationParams(ScrollMode aMode, ScrollOrigin aOrigin,
+ ScrollSnapFlags aSnapFlags,
+ ScrollTriggeredByScript aTriggeredByScript)
+ : ScrollOperationParams(aMode, aOrigin) {
+ mSnapFlags = aSnapFlags;
+ mTriggeredByScript = aTriggeredByScript;
+ }
+
+ ScrollMode mMode;
+ ScrollOrigin mOrigin;
+ ScrollSnapFlags mSnapFlags = ScrollSnapFlags::Disabled;
+ ScrollTriggeredByScript mTriggeredByScript = ScrollTriggeredByScript::No;
+ ScrollSnapTargetIds mTargetIds;
+
+ bool IsInstant() const { return mMode == ScrollMode::Instant; }
+ bool IsSmoothMsd() const { return mMode == ScrollMode::SmoothMsd; }
+ bool IsSmooth() const { return mMode == ScrollMode::Smooth; }
+ bool IsScrollSnapDisabled() const {
+ return mSnapFlags == ScrollSnapFlags::Disabled;
+ }
+ };
+
+ /**
+ * @note This method might destroy the frame, pres shell and other objects.
+ *
+ * A caller can ask this ScrollToWithOrigin() function to perform snapping by
+ * passing in aParams.mSnapFlags != ScrollSnapFlags::Disabled. Alternatively,
+ * a caller may want to do its own snapping, in which case it should pass
+ * ScrollSnapFlags::Disabled and populate aParams.mTargetIds based on the
+ * result of the snapping.
+ */
+ void ScrollToWithOrigin(nsPoint aScrollPosition, const nsRect* aRange,
+ ScrollOperationParams&& aParams);
+
+ void CompleteAsyncScroll(
+ const nsPoint& aScrollPosition, const nsRect& aRange,
+ mozilla::UniquePtr<ScrollSnapTargetIds> aSnapTargetIds,
+ ScrollOrigin aOrigin = ScrollOrigin::NotSpecified);
+
+ bool HasPerspective() const { return ChildrenHavePerspective(); }
+ bool HasBgAttachmentLocal() const;
+ mozilla::StyleDirection GetScrolledFrameDir() const;
+
+ // Ask APZ to smooth scroll to |aDestination|.
+ // This method does not clamp the destination; callers should clamp it to
+ // either the layout or the visual scroll range (APZ will happily smooth
+ // scroll to either).
+ void ApzSmoothScrollTo(
+ const nsPoint& aDestination, ScrollOrigin,
+ mozilla::ScrollTriggeredByScript,
+ mozilla::UniquePtr<ScrollSnapTargetIds> aSnapTargetIds);
+
+ // Check whether APZ can scroll in the provided directions, keeping in mind
+ // that APZ currently cannot scroll along axes which are overflow:hidden.
+ bool CanApzScrollInTheseDirections(
+ mozilla::layers::ScrollDirections aDirections);
+
+ // Removes any RefreshDriver observers we might have registered.
+ void RemoveObservers();
+
+ private:
+ // NOTE: On mobile this value might be factoring into overflow:hidden region
+ // in the case of the top level document.
+ nsRect mScrollPort;
+ mozilla::UniquePtr<ScrollSnapTargetIds> mLastSnapTargetIds;
+};
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(nsHTMLScrollFrame::OverflowState)
+
+#endif /* nsGfxScrollFrame_h___ */