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gecko-dev/layout/generic/nsGfxScrollFrame.h

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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 "nsBoxFrame.h"
#include "nsIScrollableFrame.h"
#include "nsIScrollbarMediator.h"
#include "nsIStatefulFrame.h"
#include "nsThreadUtils.h"
#include "nsIReflowCallback.h"
#include "nsBoxLayoutState.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;
namespace mozilla {
class PresShell;
struct ScrollReflowInput;
namespace layers {
class Layer;
class WebRenderLayerManager;
} // namespace layers
namespace layout {
class ScrollbarActivity;
} // namespace layout
class ScrollFrameHelper : public nsIReflowCallback {
public:
using Sides = nsIFrame::Sides;
using CSSIntPoint = mozilla::CSSIntPoint;
using ScrollbarActivity = mozilla::layout::ScrollbarActivity;
using FrameMetrics = mozilla::layers::FrameMetrics;
using ScrollableLayerGuid = mozilla::layers::ScrollableLayerGuid;
using ScrollSnapInfo = mozilla::layers::ScrollSnapInfo;
using Layer = mozilla::layers::Layer;
using WebRenderLayerManager = mozilla::layers::WebRenderLayerManager;
using ScrollAnchorContainer = mozilla::layout::ScrollAnchorContainer;
using APZScrollAnimationType = mozilla::APZScrollAnimationType;
using Element = mozilla::dom::Element;
using AnimationState = nsIScrollableFrame::AnimationState;
class AsyncScroll;
class AsyncSmoothMSDScroll;
ScrollFrameHelper(nsContainerFrame* aOuter, bool aIsRoot);
~ScrollFrameHelper();
mozilla::ScrollStyles GetScrollStylesFromFrame() const;
mozilla::layers::OverscrollBehaviorInfo GetOverscrollBehaviorInfo() const;
bool IsForTextControlWithNoScrollbars() const;
enum class AnonymousContentType {
VerticalScrollbar,
HorizontalScrollbar,
Resizer,
};
EnumSet<AnonymousContentType> GetNeededAnonymousContent() const;
EnumSet<AnonymousContentType> GetCurrentAnonymousContent() const;
bool HasAllNeededScrollbars() const {
return GetCurrentAnonymousContent().contains(GetNeededAnonymousContent());
}
// 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();
nsresult CreateAnonymousContent(
nsTArray<nsIAnonymousContentCreator::ContentInfo>& aElements);
void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
uint32_t aFilter);
enum class OverflowState : uint32_t {
None = 0,
Vertical = (1 << 0),
Horizontal = (1 << 1),
};
OverflowState GetOverflowState() const;
MOZ_CAN_RUN_SCRIPT nsresult FireScrollPortEvent();
void PostScrollEndEvent();
void FireScrollEndEvent();
void PostOverflowEvent();
using PostDestroyData = nsIFrame::PostDestroyData;
void Destroy(PostDestroyData& aPostDestroyData);
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists);
// 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.
nsDisplayWrapList* MaybeCreateTopLayerItems(nsDisplayListBuilder* aBuilder,
bool* aIsOpaque);
void AppendScrollPartsTo(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists, bool aCreateLayer,
bool aPositioned);
bool GetBorderRadii(const nsSize& aFrameSize, const nsSize& aBorderArea,
Sides aSkipSides, nscoord aRadii[8]) const;
// 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 CurPosAttributeChanged(nsIContent* aChild, bool aDoScroll = true);
void PostScrollEvent(bool aDelayed = false);
MOZ_CAN_RUN_SCRIPT void FireScrollEvent();
void PostScrolledAreaEvent();
MOZ_CAN_RUN_SCRIPT void FireScrolledAreaEvent();
bool IsSmoothScrollingEnabled();
/**
* @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);
/**
* @note This method might destroy the frame, pres shell and other objects.
* Update scrollbar curpos attributes to reflect current scroll position
*/
void UpdateScrollbarPosition();
nsSize GetLayoutSize() const {
if (mIsUsingMinimumScaleSize) {
return mICBSize;
}
return mScrollPort.Size();
}
nsRect GetScrollPortRect() const { return mScrollPort; }
nsPoint GetScrollPosition() const {
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 {
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 GetLayoutScrollRange() const;
// Get the scroll range assuming the viewport has size (aWidth, aHeight).
nsRect GetScrollRange(nscoord aWidth, nscoord aHeight) const;
nsSize GetVisualViewportSize() const;
nsPoint GetVisualViewportOffset() const;
bool SetVisualViewportOffset(const nsPoint& aOffset, bool aRepaint);
nsRect GetVisualScrollRange() const;
nsRect GetScrollRangeForUserInputEvents() 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(ScrollMode aMode = ScrollMode::SmoothMsd);
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(ScrollFrameHelper* aInstance,
mozilla::TimeStamp aTime);
static void AsyncSmoothMSDScrollCallback(ScrollFrameHelper* 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 ScrollTo(
nsPoint aScrollPosition, ScrollMode aMode,
ScrollOrigin aOrigin = ScrollOrigin::NotSpecified,
const nsRect* aRange = nullptr,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP,
ScrollTriggeredByScript aTriggeredByScript = ScrollTriggeredByScript::No);
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
ScrollMode aMode = ScrollMode::Instant);
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToCSSPixelsForApz(const mozilla::CSSPoint& aScrollPosition);
CSSIntPoint GetScrollPositionCSSPixels();
/**
* @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();
/**
* @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,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP);
void ScrollByCSSPixels(const CSSIntPoint& aDelta,
ScrollMode aMode = ScrollMode::Instant);
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToRestoredPosition();
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.
*/
bool GetSnapPointForDestination(mozilla::ScrollUnit aUnit,
const nsPoint& aStartPos,
nsPoint& aDestination);
nsMargin GetScrollPadding() const;
nsSize GetLineScrollAmount() const;
nsSize GetPageScrollAmount() const;
mozilla::UniquePtr<mozilla::PresState> SaveState() const;
void RestoreState(mozilla::PresState* aState);
nsIFrame* GetScrolledFrame() const { return mScrolledFrame; }
nsIFrame* GetScrollbarBox(bool aVertical) const {
return aVertical ? mVScrollbarBox : mHScrollbarBox;
}
void AddScrollPositionListener(nsIScrollPositionListener* aListener) {
mListeners.AppendElement(aListener);
}
void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) {
mListeners.RemoveElement(aListener);
}
static void SetScrollbarVisibility(nsIFrame* aScrollbar, bool aVisible);
/**
* 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 (although nsXULScrollFrame currently does).
*
* 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 for all
* nsXULScrollFrames, and allows scrolling down and to the left for
* nsHTMLScrollFrames with RTL directionality.
*/
nsRect GetScrolledRect() const;
/**
* 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 (although nsXULScrollFrame currently does).
*
* Currently it allows scrolling down and to the right for
* nsHTMLScrollFrames with LTR directionality and for all
* nsXULScrollFrames, and allows scrolling down and to the left for
* nsHTMLScrollFrames with RTL directionality.
*/
nsRect GetUnsnappedScrolledRectInternal(const nsRect& aScrolledOverflowArea,
const nsSize& aScrollPortSize) const;
layers::ScrollDirections GetAvailableScrollingDirectionsForUserInputEvents()
const;
layers::ScrollDirections GetScrollbarVisibility() const {
layers::ScrollDirections result;
if (mHasHorizontalScrollbar) {
result += layers::ScrollDirection::eHorizontal;
}
if (mHasVerticalScrollbar) {
result += layers::ScrollDirection::eVertical;
}
return result;
}
nsMargin GetActualScrollbarSizes(
nsIScrollableFrame::ScrollbarSizesOptions aOptions =
nsIScrollableFrame::ScrollbarSizesOptions::NONE) const;
nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState);
bool IsPhysicalLTR() const {
return mOuter->GetWritingMode().IsPhysicalLTR();
}
bool IsBidiLTR() const { return mOuter->GetWritingMode().IsBidiLTR(); }
private:
// NOTE: Use GetScrollStylesFromFrame() if you want to know `overflow`
// and `overflow-behavior` properties.
nsIFrame* GetFrameForStyle() const;
// This is the for the old unspecced scroll snap implementation.
ScrollSnapInfo ComputeOldScrollSnapInfo() const;
// This is the for the scroll snap v1 implementation.
ScrollSnapInfo ComputeScrollSnapInfo(
const Maybe<nsPoint>& aDestination) const;
bool NeedsScrollSnap() const;
// Schedule the scroll-linked animations.
void ScheduleScrollAnimations();
void TryScheduleScrollAnimations() {
if (!mMayScheduleScrollAnimations) {
return;
}
ScheduleScrollAnimations();
mMayScheduleScrollAnimations = false;
}
public:
bool IsScrollbarOnRight() const;
bool IsScrollingActive() const;
bool IsMaybeAsynchronouslyScrolled() const {
// If this is true, then we'll build an ASR, and that's what we want
// to know I think.
return mWillBuildScrollableLayer;
}
bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas);
void UpdateSticky();
void UpdatePrevScrolledRect();
bool IsRectNearlyVisible(const nsRect& aRect) const;
nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const;
// 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(nsBoxLayoutState& aState,
const nsRect& aInsideBorderArea,
const nsRect& aOldScrollPort);
void MarkScrollbarsDirtyForReflow() const;
void InvalidateScrollbars() const;
bool IsAlwaysActive() const;
void MarkEverScrolled();
void MarkRecentlyScrolled();
void MarkNotRecentlyScrolled();
nsExpirationState* GetExpirationState() { return &mActivityExpirationState; }
void SetTransformingByAPZ(bool aTransforming) {
if (mTransformingByAPZ && !aTransforming) {
PostScrollEndEvent();
}
mTransformingByAPZ = aTransforming;
if (!mozilla::css::TextOverflow::HasClippedTextOverflow(mOuter) ||
mozilla::css::TextOverflow::HasBlockEllipsis(mScrolledFrame)) {
// If the block has some overflow marker stuff we should kick off a paint
// because we have special behaviour for it when APZ scrolling is active.
mOuter->SchedulePaint();
}
}
bool IsTransformingByAPZ() const { return mTransformingByAPZ; }
void SetScrollableByAPZ(bool aScrollable);
void SetZoomableByAPZ(bool aZoomable);
void SetHasOutOfFlowContentInsideFilter();
bool UsesOverlayScrollbars() const;
// In the case where |aDestination| is given, elements which are entirely out
// of view when the scroll position is moved to |aDestination| are not going
// to be used for snap positions.
ScrollSnapInfo GetScrollSnapInfo(
const mozilla::Maybe<nsPoint>& aDestination) const;
static bool ShouldActivateAllScrollFrames();
nsRect RestrictToRootDisplayPort(const nsRect& aDisplayportBase);
bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
nsRect* aVisibleRect, nsRect* aDirtyRect,
bool aSetBase,
bool* aDirtyRectHasBeenOverriden = nullptr);
void NotifyApzTransaction();
void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort);
bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
nsRect* aDisplayPort);
bool AllowDisplayPortExpiration();
void TriggerDisplayPortExpiration();
void ResetDisplayPortExpiryTimer();
void ScheduleSyntheticMouseMove();
static void ScrollActivityCallback(nsITimer* aTimer, void* anInstance);
void HandleScrollbarStyleSwitching();
ScrollOrigin LastScrollOrigin() const { return mLastScrollOrigin; }
bool IsApzAnimationInProgress() const {
return mCurrentAPZScrollAnimationType != APZScrollAnimationType::No;
}
MainThreadScrollGeneration CurrentScrollGeneration() const {
return mScrollGeneration;
}
APZScrollGeneration ScrollGenerationOnApz() const {
return mScrollGenerationOnApz;
}
nsPoint LastScrollDestination() const { return mDestination; }
nsTArray<ScrollPositionUpdate> GetScrollUpdates() const;
bool HasScrollUpdates() const { return !mScrollUpdates.IsEmpty(); }
bool IsLastScrollUpdateAnimating() const;
mozilla::EnumSet<AnimationState> ScrollAnimationState() const;
void ResetScrollInfoIfNeeded(const MainThreadScrollGeneration& aGeneration,
const APZScrollGeneration& aGenerationOnApz,
APZScrollAnimationType aAPZScrollAnimationType);
bool WantAsyncScroll() const;
Maybe<mozilla::layers::ScrollMetadata> ComputeScrollMetadata(
WebRenderLayerManager* aLayerManager, const nsIFrame* aItemFrame,
const nsPoint& aOffsetToReferenceFrame) const;
// nsIScrollbarMediator
void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP);
void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP);
void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP);
void ScrollByUnit(nsScrollbarFrame* aScrollbar, ScrollMode aMode,
int32_t aDirection, ScrollUnit aUnit,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP);
void RepeatButtonScroll(nsScrollbarFrame* aScrollbar);
void ThumbMoved(nsScrollbarFrame* aScrollbar, nscoord aOldPos,
nscoord aNewPos);
void ScrollbarReleased(nsScrollbarFrame* aScrollbar);
bool ShouldSuppressScrollbarRepaints() const {
return mSuppressScrollbarRepaints;
}
bool DragScroll(WidgetEvent* aEvent);
void AsyncScrollbarDragInitiated(uint64_t aDragBlockId,
mozilla::layers::ScrollDirection aDirection);
void AsyncScrollbarDragRejected();
bool IsRootScrollFrameOfDocument() const { return mIsRoot; }
bool SmoothScrollVisual(
const nsPoint& aVisualViewportOffset,
mozilla::layers::FrameMetrics::ScrollOffsetUpdateType aUpdateType);
bool IsSmoothScroll(mozilla::dom::ScrollBehavior aBehavior) 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 mOuter->GetSize(), except when mOuter has 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(dom::NodeInfo* aNodeInfo,
bool aVertical,
AnonymousContentKey& aKey);
void AppendScrollUpdate(const 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;
nsIFrame* mHScrollbarBox;
nsIFrame* mVScrollbarBox;
nsIFrame* mScrolledFrame;
nsIFrame* mScrollCornerBox;
nsIFrame* mResizerBox;
nsContainerFrame* mOuter;
const nsIFrame* mReferenceFrameDuringPainting;
RefPtr<AsyncScroll> mAsyncScroll;
RefPtr<AsyncSmoothMSDScroll> mAsyncSmoothMSDScroll;
RefPtr<ScrollbarActivity> mScrollbarActivity;
nsTArray<nsIScrollPositionListener*> mListeners;
ScrollOrigin mLastScrollOrigin;
Maybe<nsPoint> mApzSmoothScrollDestination;
MainThreadScrollGeneration mScrollGeneration;
APZScrollGeneration mScrollGenerationOnApz;
nsTArray<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;
// 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;
bool mAllowScrollOriginDowngrade : 1;
bool mHadDisplayPortAtLastFrameUpdate : 1;
// True if the most recent reflow of the scroll container frame (mOuter) has
// the vertical scrollbar shown.
bool mHasVerticalScrollbar : 1;
// True if the most recent reflow of the scroll container frame (mOuter) 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;
// Whether we need to reclamp the visual viewport offset in ReflowFinished.
bool mReclampVVOffsetInReflowFinished : 1;
// Whether we need to schedule the scroll-linked 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(ScrollFrameHelper* aHelper,
AutoWeakFrame& aWeakOuter, bool aSuppress)
: mHelper(aHelper),
mWeakOuter(aWeakOuter),
mOldSuppressValue(aHelper->mSuppressScrollbarRepaints) {
mHelper->mSuppressScrollbarRepaints = aSuppress;
}
~AutoScrollbarRepaintSuppression() {
if (mWeakOuter.IsAlive()) {
mHelper->mSuppressScrollbarRepaints = mOldSuppressValue;
}
}
private:
ScrollFrameHelper* mHelper;
AutoWeakFrame& mWeakOuter;
bool mOldSuppressValue;
};
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToWithOrigin(
nsPoint aScrollPosition, ScrollMode aMode, ScrollOrigin aOrigin,
const nsRect* aRange,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP,
ScrollTriggeredByScript aTriggeredByScript = ScrollTriggeredByScript::No);
void CompleteAsyncScroll(const nsRect& aRange,
ScrollOrigin aOrigin = ScrollOrigin::NotSpecified);
bool HasPerspective() const { return mOuter->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 aOrigin,
ScrollTriggeredByScript aTriggeredByScript);
// 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;
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ScrollFrameHelper::OverflowState)
} // 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 nsIStatefulFrame {
public:
using ScrollFrameHelper = mozilla::ScrollFrameHelper;
using CSSIntPoint = mozilla::CSSIntPoint;
using ScrollReflowInput = mozilla::ScrollReflowInput;
using ScrollAnchorContainer = mozilla::layout::ScrollAnchorContainer;
friend nsHTMLScrollFrame* NS_NewHTMLScrollFrame(
mozilla::PresShell* aPresShell, ComputedStyle* aStyle, bool aIsRoot);
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS(nsHTMLScrollFrame)
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override {
mHelper.BuildDisplayList(aBuilder, aLists);
}
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 {
return mHelper.GetBorderRadii(aFrameSize, aBorderArea, aSkipSides, aRadii);
}
nscoord GetMinISize(gfxContext* aRenderingContext) override;
nscoord GetPrefISize(gfxContext* aRenderingContext) override;
nsresult GetXULPadding(nsMargin& aPadding) final;
bool IsXULCollapsed() final;
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 {
return mHelper.ComputeCustomOverflow(aOverflowAreas);
}
nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const final;
bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
nscoord* aBaseline) const final {
NS_ASSERTION(!aWM.IsOrthogonalTo(GetWritingMode()),
"You should only call this on frames with a WM that's "
"parallel to aWM");
*aBaseline = GetLogicalBaseline(aWM);
return true;
}
// 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(ChildListID aListID, nsIFrame* aOldFrame) final;
void DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData&) override;
nsIScrollableFrame* GetScrollTargetFrame() const final {
return const_cast<nsHTMLScrollFrame*>(this);
}
nsContainerFrame* GetContentInsertionFrame() override {
return mHelper.GetScrolledFrame()->GetContentInsertionFrame();
}
bool DoesClipChildrenInBothAxes() final { return true; }
nsPoint GetPositionOfChildIgnoringScrolling(const nsIFrame* aChild) final {
nsPoint pt = aChild->GetPosition();
if (aChild == mHelper.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 mHelper.GetScrolledFrame();
}
mozilla::ScrollStyles GetScrollStyles() const override {
return mHelper.GetScrollStylesFromFrame();
}
bool IsForTextControlWithNoScrollbars() const final {
return mHelper.IsForTextControlWithNoScrollbars();
}
bool HasAllNeededScrollbars() const final {
return mHelper.HasAllNeededScrollbars();
}
mozilla::layers::OverscrollBehaviorInfo GetOverscrollBehaviorInfo()
const final {
return mHelper.GetOverscrollBehaviorInfo();
}
mozilla::layers::ScrollDirections
GetAvailableScrollingDirectionsForUserInputEvents() const final {
return mHelper.GetAvailableScrollingDirectionsForUserInputEvents();
}
mozilla::layers::ScrollDirections GetScrollbarVisibility() const final {
return mHelper.GetScrollbarVisibility();
}
nsMargin GetActualScrollbarSizes(
nsIScrollableFrame::ScrollbarSizesOptions aOptions =
nsIScrollableFrame::ScrollbarSizesOptions::NONE) const final {
return mHelper.GetActualScrollbarSizes(aOptions);
}
nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) final {
return mHelper.GetDesiredScrollbarSizes(aState);
}
nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
gfxContext* aRC) final {
nsBoxLayoutState bls(aPresContext, aRC, 0);
return GetDesiredScrollbarSizes(&bls);
}
nsSize GetLayoutSize() const final { return mHelper.GetLayoutSize(); }
nsRect GetScrolledRect() const final { return mHelper.GetScrolledRect(); }
nsRect GetScrollPortRect() const final { return mHelper.GetScrollPortRect(); }
nsPoint GetScrollPosition() const final {
return mHelper.GetScrollPosition();
}
nsPoint GetLogicalScrollPosition() const final {
return mHelper.GetLogicalScrollPosition();
}
nsRect GetScrollRange() const final { return mHelper.GetLayoutScrollRange(); }
nsSize GetVisualViewportSize() const final {
return mHelper.GetVisualViewportSize();
}
nsPoint GetVisualViewportOffset() const final {
return mHelper.GetVisualViewportOffset();
}
bool SetVisualViewportOffset(const nsPoint& aOffset, bool aRepaint) final {
return mHelper.SetVisualViewportOffset(aOffset, aRepaint);
}
nsRect GetVisualScrollRange() const final {
return mHelper.GetVisualScrollRange();
}
nsRect GetScrollRangeForUserInputEvents() const final {
return mHelper.GetScrollRangeForUserInputEvents();
}
nsSize GetLineScrollAmount() const final {
return mHelper.GetLineScrollAmount();
}
nsSize GetPageScrollAmount() const final {
return mHelper.GetPageScrollAmount();
}
nsMargin GetScrollPadding() const final { return mHelper.GetScrollPadding(); }
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode,
const nsRect* aRange = nullptr,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP,
mozilla::ScrollTriggeredByScript aTriggeredByScript =
mozilla::ScrollTriggeredByScript::No) final {
mHelper.ScrollTo(aScrollPosition, aMode, ScrollOrigin::Other, aRange,
aSnap);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
ScrollMode aMode = ScrollMode::Instant) final {
mHelper.ScrollToCSSPixels(aScrollPosition, aMode);
}
void ScrollToCSSPixelsForApz(const mozilla::CSSPoint& aScrollPosition) final {
mHelper.ScrollToCSSPixelsForApz(aScrollPosition);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
CSSIntPoint GetScrollPositionCSSPixels() final {
return mHelper.GetScrollPositionCSSPixels();
}
/**
* @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,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP) final {
mHelper.ScrollBy(aDelta, aUnit, aMode, aOverflow, aOrigin, aMomentum,
aSnap);
}
void ScrollByCSSPixels(const CSSIntPoint& aDelta,
ScrollMode aMode = ScrollMode::Instant) final {
mHelper.ScrollByCSSPixels(aDelta, aMode);
}
void ScrollSnap() final { mHelper.ScrollSnap(); }
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToRestoredPosition() final { mHelper.ScrollToRestoredPosition(); }
void AddScrollPositionListener(nsIScrollPositionListener* aListener) final {
mHelper.AddScrollPositionListener(aListener);
}
void RemoveScrollPositionListener(
nsIScrollPositionListener* aListener) final {
mHelper.RemoveScrollPositionListener(aListener);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void CurPosAttributeChanged(nsIContent* aChild) final {
mHelper.CurPosAttributeChanged(aChild);
}
NS_IMETHOD PostScrolledAreaEventForCurrentArea() final {
mHelper.PostScrolledAreaEvent();
return NS_OK;
}
bool IsScrollingActive() final { return mHelper.IsScrollingActive(); }
bool IsMaybeAsynchronouslyScrolled() final {
return mHelper.IsMaybeAsynchronouslyScrolled();
}
bool DidHistoryRestore() const final { return mHelper.mDidHistoryRestore; }
void ClearDidHistoryRestore() final { mHelper.mDidHistoryRestore = false; }
void MarkEverScrolled() final { mHelper.MarkEverScrolled(); }
bool IsRectNearlyVisible(const nsRect& aRect) final {
return mHelper.IsRectNearlyVisible(aRect);
}
nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const final {
return mHelper.ExpandRectToNearlyVisible(aRect);
}
ScrollOrigin LastScrollOrigin() final { return mHelper.LastScrollOrigin(); }
using AnimationState = nsIScrollableFrame::AnimationState;
mozilla::EnumSet<AnimationState> ScrollAnimationState() const final {
return mHelper.ScrollAnimationState();
}
mozilla::MainThreadScrollGeneration CurrentScrollGeneration() const final {
return mHelper.CurrentScrollGeneration();
}
mozilla::APZScrollGeneration ScrollGenerationOnApz() const final {
return mHelper.ScrollGenerationOnApz();
}
nsPoint LastScrollDestination() final {
return mHelper.LastScrollDestination();
}
nsTArray<mozilla::ScrollPositionUpdate> GetScrollUpdates() const final {
return mHelper.GetScrollUpdates();
}
bool HasScrollUpdates() const final { return mHelper.HasScrollUpdates(); }
void ResetScrollInfoIfNeeded(
const mozilla::MainThreadScrollGeneration& aGeneration,
const mozilla::APZScrollGeneration& aGenerationOnApz,
mozilla::APZScrollAnimationType aAPZScrollAnimationType) final {
mHelper.ResetScrollInfoIfNeeded(aGeneration, aGenerationOnApz,
aAPZScrollAnimationType);
}
bool WantAsyncScroll() const final { return mHelper.WantAsyncScroll(); }
mozilla::Maybe<mozilla::layers::ScrollMetadata> ComputeScrollMetadata(
mozilla::layers::WebRenderLayerManager* aLayerManager,
const nsIFrame* aItemFrame,
const nsPoint& aOffsetToReferenceFrame) const final {
return mHelper.ComputeScrollMetadata(aLayerManager, aItemFrame,
aOffsetToReferenceFrame);
}
void MarkScrollbarsDirtyForReflow() const final {
mHelper.MarkScrollbarsDirtyForReflow();
}
void InvalidateScrollbars() const final { mHelper.InvalidateScrollbars(); }
void UpdateScrollbarPosition() final { mHelper.UpdateScrollbarPosition(); }
bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
nsRect* aVisibleRect, nsRect* aDirtyRect,
bool aSetBase) final {
return mHelper.DecideScrollableLayer(aBuilder, aVisibleRect, aDirtyRect,
aSetBase);
}
void NotifyApzTransaction() final { mHelper.NotifyApzTransaction(); }
void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort) final {
mHelper.NotifyApproximateFrameVisibilityUpdate(aIgnoreDisplayPort);
}
bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
nsRect* aDisplayPort) final {
return mHelper.GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
aDisplayPort);
}
void TriggerDisplayPortExpiration() final {
mHelper.TriggerDisplayPortExpiration();
}
// nsIStatefulFrame
mozilla::UniquePtr<mozilla::PresState> SaveState() final {
return mHelper.SaveState();
}
NS_IMETHOD RestoreState(mozilla::PresState* aState) final {
NS_ENSURE_ARG_POINTER(aState);
mHelper.RestoreState(aState);
return NS_OK;
}
// nsIScrollbarMediator
void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP) final {
mHelper.ScrollByPage(aScrollbar, aDirection, aSnap);
}
void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP) final {
mHelper.ScrollByWhole(aScrollbar, aDirection, aSnap);
}
void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP) final {
mHelper.ScrollByLine(aScrollbar, aDirection, aSnap);
}
void ScrollByUnit(nsScrollbarFrame* aScrollbar, ScrollMode aMode,
int32_t aDirection, mozilla::ScrollUnit aUnit,
ScrollSnapMode aSnap = DISABLE_SNAP) final {
mHelper.ScrollByUnit(aScrollbar, aMode, aDirection, aUnit, aSnap);
}
void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) final {
mHelper.RepeatButtonScroll(aScrollbar);
}
void ThumbMoved(nsScrollbarFrame* aScrollbar, nscoord aOldPos,
nscoord aNewPos) final {
mHelper.ThumbMoved(aScrollbar, aOldPos, aNewPos);
}
void ScrollbarReleased(nsScrollbarFrame* aScrollbar) final {
mHelper.ScrollbarReleased(aScrollbar);
}
void VisibilityChanged(bool aVisible) final {}
nsIFrame* GetScrollbarBox(bool aVertical) final {
return mHelper.GetScrollbarBox(aVertical);
}
void ScrollbarActivityStarted() const final;
void ScrollbarActivityStopped() const final;
bool IsScrollbarOnRight() const final { return mHelper.IsScrollbarOnRight(); }
bool ShouldSuppressScrollbarRepaints() const final {
return mHelper.ShouldSuppressScrollbarRepaints();
}
void SetTransformingByAPZ(bool aTransforming) final {
mHelper.SetTransformingByAPZ(aTransforming);
}
bool IsTransformingByAPZ() const final {
return mHelper.IsTransformingByAPZ();
}
void SetScrollableByAPZ(bool aScrollable) final {
mHelper.SetScrollableByAPZ(aScrollable);
}
void SetZoomableByAPZ(bool aZoomable) final {
mHelper.SetZoomableByAPZ(aZoomable);
}
void SetHasOutOfFlowContentInsideFilter() final {
mHelper.SetHasOutOfFlowContentInsideFilter();
}
ScrollSnapInfo GetScrollSnapInfo() const final {
return mHelper.GetScrollSnapInfo(Nothing());
}
bool DragScroll(mozilla::WidgetEvent* aEvent) final {
return mHelper.DragScroll(aEvent);
}
void AsyncScrollbarDragInitiated(
uint64_t aDragBlockId,
mozilla::layers::ScrollDirection aDirection) final {
return mHelper.AsyncScrollbarDragInitiated(aDragBlockId, aDirection);
}
void AsyncScrollbarDragRejected() final {
return mHelper.AsyncScrollbarDragRejected();
}
bool IsRootScrollFrameOfDocument() const final {
return mHelper.IsRootScrollFrameOfDocument();
}
const ScrollAnchorContainer* Anchor() const final { return &mHelper.mAnchor; }
ScrollAnchorContainer* Anchor() final { return &mHelper.mAnchor; }
// Return the scrolled frame.
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) final {
aResult.AppendElement(OwnedAnonBox(mHelper.GetScrolledFrame()));
}
bool SmoothScrollVisual(
const nsPoint& aVisualViewportOffset,
mozilla::layers::FrameMetrics::ScrollOffsetUpdateType aUpdateType) final {
return mHelper.SmoothScrollVisual(aVisualViewportOffset, aUpdateType);
}
bool IsSmoothScroll(mozilla::dom::ScrollBehavior aBehavior) const final {
return mHelper.IsSmoothScroll(aBehavior);
}
#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);
void SetSuppressScrollbarUpdate(bool aSuppress) {
mHelper.mSuppressScrollbarUpdate = aSuppress;
}
bool GuessHScrollbarNeeded(const ScrollReflowInput& aState);
bool GuessVScrollbarNeeded(const ScrollReflowInput& aState);
bool IsScrollbarUpdateSuppressed() const {
return mHelper.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:
friend class mozilla::ScrollFrameHelper;
ScrollFrameHelper mHelper;
};
/**
* 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 nsXULScrollFrame final : public nsBoxFrame,
public nsIScrollableFrame,
public nsIAnonymousContentCreator,
public nsIStatefulFrame {
public:
using ScrollFrameHelper = mozilla::ScrollFrameHelper;
using CSSIntPoint = mozilla::CSSIntPoint;
using ScrollAnchorContainer = mozilla::layout::ScrollAnchorContainer;
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS(nsXULScrollFrame)
friend nsXULScrollFrame* NS_NewXULScrollFrame(mozilla::PresShell* aPresShell,
ComputedStyle* aStyle,
bool aIsRoot);
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) final {
mHelper.BuildDisplayList(aBuilder, aLists);
}
// XXXldb Is this actually used?
#if 0
nscoord GetMinISize(gfxContext *aRenderingContext) final;
#endif
bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas) final {
return mHelper.ComputeCustomOverflow(aOverflowAreas);
}
bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
nscoord* aBaseline) const final {
*aBaseline = GetLogicalBaseline(aWM);
return true;
}
// 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) final;
void AppendFrames(ChildListID aListID, nsFrameList& aFrameList) final;
void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
const nsLineList::iterator* aPrevFrameLine,
nsFrameList& aFrameList) final;
void RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) final;
void DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) final;
nsIScrollableFrame* GetScrollTargetFrame() const final {
return const_cast<nsXULScrollFrame*>(this);
}
nsContainerFrame* GetContentInsertionFrame() final {
return mHelper.GetScrolledFrame()->GetContentInsertionFrame();
}
bool DoesClipChildrenInBothAxes() final { return true; }
nsPoint GetPositionOfChildIgnoringScrolling(const nsIFrame* aChild) final {
nsPoint pt = aChild->GetPosition();
if (aChild == mHelper.GetScrolledFrame())
pt += mHelper.GetLogicalScrollPosition();
return pt;
}
// nsIAnonymousContentCreator
nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) final;
void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
uint32_t aFilter) final;
nsSize GetXULMinSize(nsBoxLayoutState& aBoxLayoutState) final;
nsSize GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState) final;
nsSize GetXULMaxSize(nsBoxLayoutState& aBoxLayoutState) final;
nscoord GetXULBoxAscent(nsBoxLayoutState& aBoxLayoutState) final;
NS_IMETHOD DoXULLayout(nsBoxLayoutState& aBoxLayoutState) final;
nsresult GetXULPadding(nsMargin& aPadding) final;
bool GetBorderRadii(const nsSize& aFrameSize, const nsSize& aBorderArea,
Sides aSkipSides, nscoord aRadii[8]) const final {
return mHelper.GetBorderRadii(aFrameSize, aBorderArea, aSkipSides, aRadii);
}
nsresult XULLayout(nsBoxLayoutState& aState);
void LayoutScrollArea(nsBoxLayoutState& aState,
const nsPoint& aScrollPosition);
bool AddRemoveScrollbar(nsBoxLayoutState& aState, bool aOnRightOrBottom,
bool aHorizontal, bool aAdd);
bool AddHorizontalScrollbar(nsBoxLayoutState& aState, bool aOnBottom);
bool AddVerticalScrollbar(nsBoxLayoutState& aState, bool aOnRight);
void RemoveHorizontalScrollbar(nsBoxLayoutState& aState, bool aOnBottom);
void RemoveVerticalScrollbar(nsBoxLayoutState& aState, bool aOnRight);
static void AdjustReflowInputForPrintPreview(nsBoxLayoutState& aState,
bool& aSetBack);
static void AdjustReflowInputBack(nsBoxLayoutState& aState, bool aSetBack);
// nsIScrollableFrame
nsIFrame* GetScrolledFrame() const final {
return mHelper.GetScrolledFrame();
}
mozilla::ScrollStyles GetScrollStyles() const final {
return mHelper.GetScrollStylesFromFrame();
}
bool IsForTextControlWithNoScrollbars() const final {
return mHelper.IsForTextControlWithNoScrollbars();
}
bool HasAllNeededScrollbars() const final {
return mHelper.HasAllNeededScrollbars();
}
mozilla::layers::OverscrollBehaviorInfo GetOverscrollBehaviorInfo()
const final {
return mHelper.GetOverscrollBehaviorInfo();
}
mozilla::layers::ScrollDirections
GetAvailableScrollingDirectionsForUserInputEvents() const final {
return mHelper.GetAvailableScrollingDirectionsForUserInputEvents();
}
mozilla::layers::ScrollDirections GetScrollbarVisibility() const final {
return mHelper.GetScrollbarVisibility();
}
nsMargin GetActualScrollbarSizes(
nsIScrollableFrame::ScrollbarSizesOptions aOptions =
nsIScrollableFrame::ScrollbarSizesOptions::NONE) const final {
return mHelper.GetActualScrollbarSizes(aOptions);
}
nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) final {
return mHelper.GetDesiredScrollbarSizes(aState);
}
nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
gfxContext* aRC) final {
nsBoxLayoutState bls(aPresContext, aRC, 0);
return GetDesiredScrollbarSizes(&bls);
}
nsSize GetLayoutSize() const final { return mHelper.GetLayoutSize(); }
nsRect GetScrolledRect() const final { return mHelper.GetScrolledRect(); }
nsRect GetScrollPortRect() const final { return mHelper.GetScrollPortRect(); }
nsPoint GetScrollPosition() const final {
return mHelper.GetScrollPosition();
}
nsPoint GetLogicalScrollPosition() const final {
return mHelper.GetLogicalScrollPosition();
}
nsRect GetScrollRange() const final { return mHelper.GetLayoutScrollRange(); }
nsSize GetVisualViewportSize() const final {
return mHelper.GetVisualViewportSize();
}
nsPoint GetVisualViewportOffset() const final {
return mHelper.GetVisualViewportOffset();
}
bool SetVisualViewportOffset(const nsPoint& aOffset, bool aRepaint) final {
return mHelper.SetVisualViewportOffset(aOffset, aRepaint);
}
nsRect GetVisualScrollRange() const final {
return mHelper.GetVisualScrollRange();
}
nsRect GetScrollRangeForUserInputEvents() const final {
return mHelper.GetScrollRangeForUserInputEvents();
}
nsSize GetLineScrollAmount() const final {
return mHelper.GetLineScrollAmount();
}
nsSize GetPageScrollAmount() const final {
return mHelper.GetPageScrollAmount();
}
nsMargin GetScrollPadding() const final { return mHelper.GetScrollPadding(); }
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode,
const nsRect* aRange = nullptr,
ScrollSnapMode aSnap = nsIScrollbarMediator::DISABLE_SNAP,
mozilla::ScrollTriggeredByScript aTriggeredByScript =
mozilla::ScrollTriggeredByScript::No) final {
mHelper.ScrollTo(aScrollPosition, aMode, ScrollOrigin::Other, aRange,
aSnap);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
ScrollMode aMode = ScrollMode::Instant) final {
mHelper.ScrollToCSSPixels(aScrollPosition, aMode);
}
void ScrollToCSSPixelsForApz(const mozilla::CSSPoint& aScrollPosition) final {
mHelper.ScrollToCSSPixelsForApz(aScrollPosition);
}
CSSIntPoint GetScrollPositionCSSPixels() final {
return mHelper.GetScrollPositionCSSPixels();
}
/**
* @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,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP) final {
mHelper.ScrollBy(aDelta, aUnit, aMode, aOverflow, aOrigin, aMomentum,
aSnap);
}
void ScrollByCSSPixels(const CSSIntPoint& aDelta,
ScrollMode aMode = ScrollMode::Instant) final {
mHelper.ScrollByCSSPixels(aDelta, aMode);
}
void ScrollSnap() final { mHelper.ScrollSnap(); }
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToRestoredPosition() final { mHelper.ScrollToRestoredPosition(); }
void AddScrollPositionListener(nsIScrollPositionListener* aListener) final {
mHelper.AddScrollPositionListener(aListener);
}
void RemoveScrollPositionListener(
nsIScrollPositionListener* aListener) final {
mHelper.RemoveScrollPositionListener(aListener);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void CurPosAttributeChanged(nsIContent* aChild) final {
mHelper.CurPosAttributeChanged(aChild);
}
NS_IMETHOD PostScrolledAreaEventForCurrentArea() final {
mHelper.PostScrolledAreaEvent();
return NS_OK;
}
bool IsScrollingActive() final { return mHelper.IsScrollingActive(); }
bool IsMaybeAsynchronouslyScrolled() final {
return mHelper.IsMaybeAsynchronouslyScrolled();
}
bool DidHistoryRestore() const final { return mHelper.mDidHistoryRestore; }
void ClearDidHistoryRestore() final { mHelper.mDidHistoryRestore = false; }
void MarkEverScrolled() final { mHelper.MarkEverScrolled(); }
bool IsRectNearlyVisible(const nsRect& aRect) final {
return mHelper.IsRectNearlyVisible(aRect);
}
nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const final {
return mHelper.ExpandRectToNearlyVisible(aRect);
}
ScrollOrigin LastScrollOrigin() final { return mHelper.LastScrollOrigin(); }
using AnimationState = nsIScrollableFrame::AnimationState;
mozilla::EnumSet<AnimationState> ScrollAnimationState() const final {
return mHelper.ScrollAnimationState();
}
mozilla::MainThreadScrollGeneration CurrentScrollGeneration() const final {
return mHelper.CurrentScrollGeneration();
}
mozilla::APZScrollGeneration ScrollGenerationOnApz() const final {
return mHelper.ScrollGenerationOnApz();
}
nsPoint LastScrollDestination() final {
return mHelper.LastScrollDestination();
}
nsTArray<mozilla::ScrollPositionUpdate> GetScrollUpdates() const final {
return mHelper.GetScrollUpdates();
}
bool HasScrollUpdates() const final { return mHelper.HasScrollUpdates(); }
void ResetScrollInfoIfNeeded(
const mozilla::MainThreadScrollGeneration& aGeneration,
const mozilla::APZScrollGeneration& aGenerationOnApz,
mozilla::APZScrollAnimationType aAPZScrollAnimationType) final {
mHelper.ResetScrollInfoIfNeeded(aGeneration, aGenerationOnApz,
aAPZScrollAnimationType);
}
bool WantAsyncScroll() const final { return mHelper.WantAsyncScroll(); }
mozilla::Maybe<mozilla::layers::ScrollMetadata> ComputeScrollMetadata(
mozilla::layers::WebRenderLayerManager* aLayerManager,
const nsIFrame* aItemFrame,
const nsPoint& aOffsetToReferenceFrame) const final {
return mHelper.ComputeScrollMetadata(aLayerManager, aItemFrame,
aOffsetToReferenceFrame);
}
void MarkScrollbarsDirtyForReflow() const final {
mHelper.MarkScrollbarsDirtyForReflow();
}
void InvalidateScrollbars() const final { mHelper.InvalidateScrollbars(); }
void UpdateScrollbarPosition() final { mHelper.UpdateScrollbarPosition(); }
// nsIStatefulFrame
mozilla::UniquePtr<mozilla::PresState> SaveState() final {
return mHelper.SaveState();
}
NS_IMETHOD RestoreState(mozilla::PresState* aState) final {
NS_ENSURE_ARG_POINTER(aState);
mHelper.RestoreState(aState);
return NS_OK;
}
bool IsFrameOfType(uint32_t aFlags) const final {
// Override bogus IsFrameOfType in nsBoxFrame.
if (aFlags & (nsIFrame::eReplacedContainsBlock | nsIFrame::eReplaced))
return false;
return nsBoxFrame::IsFrameOfType(aFlags);
}
void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP) final {
mHelper.ScrollByPage(aScrollbar, aDirection, aSnap);
}
void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP) final {
mHelper.ScrollByWhole(aScrollbar, aDirection, aSnap);
}
void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
nsIScrollbarMediator::ScrollSnapMode aSnap =
nsIScrollbarMediator::DISABLE_SNAP) final {
mHelper.ScrollByLine(aScrollbar, aDirection, aSnap);
}
void ScrollByUnit(nsScrollbarFrame* aScrollbar, ScrollMode aMode,
int32_t aDirection, mozilla::ScrollUnit aUnit,
ScrollSnapMode aSnap = DISABLE_SNAP) final {
mHelper.ScrollByUnit(aScrollbar, aMode, aDirection, aUnit, aSnap);
}
void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) final {
mHelper.RepeatButtonScroll(aScrollbar);
}
void ThumbMoved(nsScrollbarFrame* aScrollbar, nscoord aOldPos,
nscoord aNewPos) final {
mHelper.ThumbMoved(aScrollbar, aOldPos, aNewPos);
}
void ScrollbarReleased(nsScrollbarFrame* aScrollbar) final {
mHelper.ScrollbarReleased(aScrollbar);
}
void VisibilityChanged(bool aVisible) final {}
nsIFrame* GetScrollbarBox(bool aVertical) final {
return mHelper.GetScrollbarBox(aVertical);
}
void ScrollbarActivityStarted() const final;
void ScrollbarActivityStopped() const final;
bool IsScrollbarOnRight() const final { return mHelper.IsScrollbarOnRight(); }
bool ShouldSuppressScrollbarRepaints() const final {
return mHelper.ShouldSuppressScrollbarRepaints();
}
void SetTransformingByAPZ(bool aTransforming) final {
mHelper.SetTransformingByAPZ(aTransforming);
}
bool IsTransformingByAPZ() const final {
return mHelper.IsTransformingByAPZ();
}
void SetScrollableByAPZ(bool aScrollable) final {
mHelper.SetScrollableByAPZ(aScrollable);
}
void SetZoomableByAPZ(bool aZoomable) final {
mHelper.SetZoomableByAPZ(aZoomable);
}
void SetHasOutOfFlowContentInsideFilter() final {
mHelper.SetHasOutOfFlowContentInsideFilter();
}
bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
nsRect* aVisibleRect, nsRect* aDirtyRect,
bool aSetBase) final {
return mHelper.DecideScrollableLayer(aBuilder, aVisibleRect, aDirtyRect,
aSetBase);
}
void NotifyApzTransaction() final { mHelper.NotifyApzTransaction(); }
void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort) final {
mHelper.NotifyApproximateFrameVisibilityUpdate(aIgnoreDisplayPort);
}
bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
nsRect* aDisplayPort) final {
return mHelper.GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
aDisplayPort);
}
void TriggerDisplayPortExpiration() final {
mHelper.TriggerDisplayPortExpiration();
}
ScrollSnapInfo GetScrollSnapInfo() const final {
return mHelper.GetScrollSnapInfo(Nothing());
}
bool DragScroll(mozilla::WidgetEvent* aEvent) final {
return mHelper.DragScroll(aEvent);
}
void AsyncScrollbarDragInitiated(
uint64_t aDragBlockId,
mozilla::layers::ScrollDirection aDirection) final {
return mHelper.AsyncScrollbarDragInitiated(aDragBlockId, aDirection);
}
void AsyncScrollbarDragRejected() final {
return mHelper.AsyncScrollbarDragRejected();
}
bool IsRootScrollFrameOfDocument() const final {
return mHelper.IsRootScrollFrameOfDocument();
}
const ScrollAnchorContainer* Anchor() const final { return &mHelper.mAnchor; }
ScrollAnchorContainer* Anchor() final { return &mHelper.mAnchor; }
// Return the scrolled frame.
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) final {
aResult.AppendElement(OwnedAnonBox(mHelper.GetScrolledFrame()));
}
bool SmoothScrollVisual(
const nsPoint& aVisualViewportOffset,
mozilla::layers::FrameMetrics::ScrollOffsetUpdateType aUpdateType) final {
return mHelper.SmoothScrollVisual(aVisualViewportOffset, aUpdateType);
}
bool IsSmoothScroll(mozilla::dom::ScrollBehavior aBehavior) const final {
return mHelper.IsSmoothScroll(aBehavior);
}
#ifdef DEBUG_FRAME_DUMP
nsresult GetFrameName(nsAString& aResult) const final;
#endif
protected:
nsXULScrollFrame(ComputedStyle*, nsPresContext*, bool aIsRoot);
void ClampAndSetBounds(nsBoxLayoutState& aState, nsRect& aRect,
nsPoint aScrollPosition,
bool aRemoveOverflowAreas = false) {
/*
* For RTL frames, restore the original scrolled position of the right
* edge, then subtract the current width to find the physical position.
*/
if (!mHelper.IsPhysicalLTR()) {
aRect.x = mHelper.ScrollPort().XMost() - aScrollPosition.x - aRect.width;
}
mHelper.mScrolledFrame->SetXULBounds(aState, aRect, aRemoveOverflowAreas);
}
private:
friend class mozilla::ScrollFrameHelper;
ScrollFrameHelper mHelper;
};
#endif /* nsGfxScrollFrame_h___ */
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