/* -*- 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 for CSS "display: flex" and "display: -webkit-box" */ #ifndef nsFlexContainerFrame_h___ #define nsFlexContainerFrame_h___ #include #include "mozilla/dom/FlexBinding.h" #include "mozilla/UniquePtr.h" #include "nsContainerFrame.h" #include "nsILineIterator.h" namespace mozilla { class LogicalPoint; class PresShell; } // namespace mozilla nsContainerFrame* NS_NewFlexContainerFrame(mozilla::PresShell* aPresShell, mozilla::ComputedStyle* aStyle); /** * These structures are used to capture data during reflow to be * extracted by devtools via Chrome APIs. The structures are only * created when requested in GetFlexFrameWithComputedInfo(), and * the structures are attached to the nsFlexContainerFrame via the * FlexContainerInfo property. */ struct ComputedFlexItemInfo { nsCOMPtr mNode; nsRect mFrameRect; /** * mMainBaseSize is a measure of the size of the item in the main * axis before the flex sizing algorithm is applied. In the spec, * this is called "flex base size", but we use this name to connect * the value to the other main axis sizes. */ nscoord mMainBaseSize; /** * mMainDeltaSize is the amount that the flex sizing algorithm * adds to the mMainBaseSize, before clamping to mMainMinSize and * mMainMaxSize. This can be thought of as the amount by which the * flex layout algorithm "wants" to shrink or grow the item, and * would do, if it was unconstrained. Since the flex sizing * algorithm proceeds linearly, the mMainDeltaSize for an item only * respects the resolved size of items already frozen. */ nscoord mMainDeltaSize; nscoord mMainMinSize; nscoord mMainMaxSize; nscoord mCrossMinSize; nscoord mCrossMaxSize; mozilla::dom::FlexItemClampState mClampState; }; struct ComputedFlexLineInfo { nsTArray mItems; nscoord mCrossStart; nscoord mCrossSize; nscoord mFirstBaselineOffset; nscoord mLastBaselineOffset; mozilla::dom::FlexLineGrowthState mGrowthState; }; struct ComputedFlexContainerInfo { nsTArray mLines; mozilla::dom::FlexPhysicalDirection mMainAxisDirection; mozilla::dom::FlexPhysicalDirection mCrossAxisDirection; }; /** * Helper class to get the orientation of a flex container's axes. */ class MOZ_STACK_CLASS FlexboxAxisInfo final { public: explicit FlexboxAxisInfo(const nsIFrame* aFlexContainer); // Is our main axis the inline axis? (Are we 'flex-direction:row[-reverse]'?) bool mIsRowOriented = true; // Is our main axis in the opposite direction as mWM's corresponding axis? // (e.g. RTL vs LTR) bool mIsMainAxisReversed = false; // Is our cross axis in the opposite direction as mWM's corresponding axis? // (e.g. BTT vs TTB) bool mIsCrossAxisReversed = false; private: // Helpers for constructor which determine the orientation of our axes, based // on legacy box properties (-webkit-box-orient, -webkit-box-direction) or // modern flexbox properties (flex-direction, flex-wrap) depending on whether // the flex container is a "legacy box" (as determined by IsLegacyBox). void InitAxesFromLegacyProps(const nsIFrame* aFlexContainer); void InitAxesFromModernProps(const nsIFrame* aFlexContainer); }; /** * This is the rendering object used for laying out elements with * "display: flex" or "display: inline-flex". * * We also use this class for elements with "display: -webkit-box" or * "display: -webkit-inline-box" (but not "-moz-box" / "-moz-inline-box" -- * those are rendered with old-school XUL frame classes). * * Note: we represent the -webkit-box family of properties (-webkit-box-orient, * -webkit-box-flex, etc.) as aliases for their -moz equivalents. And for * -webkit-{inline-}box containers, nsFlexContainerFrame will honor those * "legacy" properties for alignment/flexibility/etc. *instead of* honoring the * modern flexbox & alignment properties. For brevity, many comments in * nsFlexContainerFrame.cpp simply refer to these properties using their * "-webkit" versions, since we're mostly expecting to encounter them in that * form. (Technically, the "-moz" versions of these properties *can* influence * layout here as well (since that's what the -webkit versions are aliased to) * -- but only inside of a "display:-webkit-{inline-}box" container.) */ class nsFlexContainerFrame final : public nsContainerFrame, public nsILineIterator { public: NS_DECL_FRAMEARENA_HELPERS(nsFlexContainerFrame) NS_DECL_QUERYFRAME // Factory method: friend nsContainerFrame* NS_NewFlexContainerFrame( mozilla::PresShell* aPresShell, ComputedStyle* aStyle); // Forward-decls of helper classes class FlexItem; class FlexLine; class FlexboxAxisTracker; struct StrutInfo; class CachedBAxisMeasurement; class CachedFlexItemData; struct SharedFlexData; struct PerFragmentFlexData; class FlexItemIterator; // nsIFrame overrides void Init(nsIContent* aContent, nsContainerFrame* aParent, nsIFrame* aPrevInFlow) override; void BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) override; void MarkIntrinsicISizesDirty() override; void Reflow(nsPresContext* aPresContext, ReflowOutput& aReflowOutput, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) override; nscoord GetMinISize(gfxContext* aRenderingContext) override; nscoord GetPrefISize(gfxContext* aRenderingContext) override; #ifdef DEBUG_FRAME_DUMP nsresult GetFrameName(nsAString& aResult) const override; #endif Maybe GetNaturalBaselineBOffset( mozilla::WritingMode aWM, BaselineSharingGroup aBaselineGroup, BaselineExportContext) const override; // Unions the child overflow from our in-flow children. void UnionInFlowChildOverflow(mozilla::OverflowAreas&); // Unions the child overflow from all our children, including out of flows. void UnionChildOverflow(mozilla::OverflowAreas&) final; // nsContainerFrame overrides bool DrainSelfOverflowList() override; void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override; void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, const nsLineList::iterator* aPrevFrameLine, nsFrameList&& aFrameList) override; void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override; mozilla::StyleAlignFlags CSSAlignmentForAbsPosChild( const ReflowInput& aChildRI, mozilla::LogicalAxis aLogicalAxis) const override; /** * Helper function to calculate packing space and initial offset of alignment * subjects in MainAxisPositionTracker() and CrossAxisPositionTracker() for * space-between, space-around, and space-evenly. * * @param aNumThingsToPack Number of alignment subjects. * @param aAlignVal Value for align-content or * justify-content. * @param aFirstSubjectOffset Outparam for first subject offset. * @param aNumPackingSpacesRemaining Outparam for number of equal-sized * packing spaces to apply between each * alignment subject. * @param aPackingSpaceRemaining Outparam for total amount of packing * space to be divided up. */ static void CalculatePackingSpace( uint32_t aNumThingsToPack, const mozilla::StyleContentDistribution& aAlignVal, nscoord* aFirstSubjectOffset, uint32_t* aNumPackingSpacesRemaining, nscoord* aPackingSpaceRemaining); /** * This property is created by a call to * nsFlexContainerFrame::GetFlexFrameWithComputedInfo. */ NS_DECLARE_FRAME_PROPERTY_DELETABLE(FlexContainerInfo, ComputedFlexContainerInfo) /** * This function should only be called on a nsFlexContainerFrame * that has just been returned by a call to * GetFlexFrameWithComputedInfo. */ const ComputedFlexContainerInfo* GetFlexContainerInfo() { const ComputedFlexContainerInfo* info = GetProperty(FlexContainerInfo()); NS_WARNING_ASSERTION(info, "Property generation wasn't requested. " "This is a known issue in Print Preview. " "See Bug 1157012."); return info; } /** * Return aFrame as a flex frame after ensuring it has computed flex info. * @return nullptr if aFrame is null or doesn't have a flex frame * as its content insertion frame. * @note this might destroy layout/style data since it may flush layout. */ MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsFlexContainerFrame* GetFlexFrameWithComputedInfo(nsIFrame* aFrame); /** * Given a frame for a flex item, this method returns true IFF that flex * item's inline axis is the same as (i.e. not orthogonal to) its flex * container's main axis. * * (This method is only intended to be used from external * callers. Inside of flex reflow code, FlexItem::IsInlineAxisMainAxis() is * equivalent & more optimal.) * * @param aFrame a flex item (must return true from IsFlexItem) * @return true iff aFrame's inline axis is the same as (i.e. not orthogonal * to) its flex container's main axis. Otherwise, false. */ static bool IsItemInlineAxisMainAxis(nsIFrame* aFrame); /** * Returns true iff the given computed 'flex-basis' & main-size property * values collectively represent a used flex-basis of 'content'. * See https://drafts.csswg.org/css-flexbox-1/#valdef-flex-basis-auto * * @param aFlexBasis the computed 'flex-basis' for a flex item. * @param aMainSize the computed main-size property for a flex item. */ static bool IsUsedFlexBasisContent(const mozilla::StyleFlexBasis& aFlexBasis, const mozilla::StyleSize& aMainSize); /** * Callback for nsIFrame::MarkIntrinsicISizesDirty() on a flex item. */ static void MarkCachedFlexMeasurementsDirty(nsIFrame* aItemFrame); bool CanProvideLineIterator() const final { return true; } nsILineIterator* GetLineIterator() final { return this; } int32_t GetNumLines() const final; bool IsLineIteratorFlowRTL() final; mozilla::Result GetLine(int32_t aLineNumber) final; int32_t FindLineContaining(nsIFrame* aFrame, int32_t aStartLine = 0) final; NS_IMETHOD FindFrameAt(int32_t aLineNumber, nsPoint aPos, nsIFrame** aFrameFound, bool* aPosIsBeforeFirstFrame, bool* aPosIsAfterLastFrame) final; NS_IMETHOD CheckLineOrder(int32_t aLine, bool* aIsReordered, nsIFrame** aFirstVisual, nsIFrame** aLastVisual) final; protected: // Protected constructor & destructor explicit nsFlexContainerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext) : nsContainerFrame(aStyle, aPresContext, kClassID) {} virtual ~nsFlexContainerFrame(); // Protected flex-container-specific methods / member-vars /** * This method does the bulk of the flex layout, implementing the algorithm * described at: https://drafts.csswg.org/css-flexbox-1/#layout-algorithm * (with a few initialization pieces happening in the caller, Reflow(). * * (The logic behind the division of work between Reflow and DoFlexLayout is * as follows: DoFlexLayout() begins at the step that we have to jump back * to, if we find any visibility:collapse children, and Reflow() does * everything before that point.) * * @param aTentativeContentBoxMainSize the "tentative" content-box main-size * of the flex container; "tentative" * because it may be unconstrained or may * run off the page. * @param aTentativeContentBoxCrossSize the "tentative" content-box cross-size * of the flex container; "tentative" * because it may be unconstrained or may * run off the page. */ struct FlexLayoutResult final { // The flex lines of the flex container. nsTArray mLines; // The absolutely-positioned flex children. nsTArray mPlaceholders; bool mHasCollapsedItems = false; // The final content-box main-size of the flex container as if there's no // fragmentation. nscoord mContentBoxMainSize = NS_UNCONSTRAINEDSIZE; // The final content-box cross-size of the flex container as if there's no // fragmentation. nscoord mContentBoxCrossSize = NS_UNCONSTRAINEDSIZE; // The flex container's ascent for the "first baseline" alignment, derived // from any baseline-aligned flex items in the startmost (from the // perspective of the flex container's WM) flex line, if any such items // exist. Otherwise, nscoord_MIN. // // Note: this is a distance from the border-box block-start edge. nscoord mAscent = NS_UNCONSTRAINEDSIZE; // The flex container's ascent for the "last baseline" alignment, derived // from any baseline-aligned flex items in the endmost (from the perspective // of the flex container's WM) flex line, if any such items exist. // Otherwise, nscoord_MIN. // // Note: this is a distance from the border-box block-end edge. It's // different from the identically-named-member FlexItem::mAscentForLast, // which is a distance from the item frame's border-box block-start edge. nscoord mAscentForLast = NS_UNCONSTRAINEDSIZE; }; FlexLayoutResult DoFlexLayout( const ReflowInput& aReflowInput, const nscoord aTentativeContentBoxMainSize, const nscoord aTentativeContentBoxCrossSize, const FlexboxAxisTracker& aAxisTracker, nscoord aMainGapSize, nscoord aCrossGapSize, nsTArray& aStruts, ComputedFlexContainerInfo* const aContainerInfo); /** * If our devtools have requested a ComputedFlexContainerInfo for this flex * container, this method ensures that we have one (and if one already exists, * this method reinitializes it to look like a freshly-created one). * * @return the pointer to a freshly created or reinitialized * ComputedFlexContainerInfo if our devtools have requested it; * otherwise nullptr. */ ComputedFlexContainerInfo* CreateOrClearFlexContainerInfo(); /** * Helpers for DoFlexLayout to computed fields in ComputedFlexContainerInfo. */ static void CreateFlexLineAndFlexItemInfo( ComputedFlexContainerInfo& aContainerInfo, const nsTArray& aLines); static void ComputeFlexDirections(ComputedFlexContainerInfo& aContainerInfo, const FlexboxAxisTracker& aAxisTracker); static void UpdateFlexLineAndItemInfo( ComputedFlexContainerInfo& aContainerInfo, const nsTArray& aLines); /** * Helper to query flex item's consumed block-size. */ static nscoord FlexItemConsumedBSize(const FlexItem& aItem); #ifdef DEBUG void SanityCheckAnonymousFlexItems() const; #endif // DEBUG /** * Construct a new FlexItem for the given child frame, directly at the end of * aLine. * * Before returning, this method also processes the FlexItem to resolve its * flex basis (including e.g. auto-height) as well as to resolve * "min-height:auto", via ResolveAutoFlexBasisAndMinSize(). (Basically, the * constructed FlexItem will be ready to participate in the "Resolve the * Flexible Lengths" step of the Flex Layout Algorithm.) * https://drafts.csswg.org/css-flexbox-1/#algo-flex * * Note that this method **does not** update aLine's main-size bookkeeping to * account for the newly-constructed flex item. The caller is responsible for * determining whether this line is a good fit for the new item. If so, the * caller should update aLine's bookkeeping (via * FlexLine::AddLastItemToMainSizeTotals), or move the new item to a new line. */ void GenerateFlexItemForChild(FlexLine& aLine, nsIFrame* aChildFrame, const ReflowInput& aParentReflowInput, const FlexboxAxisTracker& aAxisTracker, const nscoord aTentativeContentBoxCrossSize); /** * This method looks up cached block-axis measurements for a flex item, or * does a measuring reflow and caches those measurements. * * This avoids exponential reflows - see the comment above the * CachedBAxisMeasurement struct. */ const CachedBAxisMeasurement& MeasureBSizeForFlexItem( FlexItem& aItem, ReflowInput& aChildReflowInput); /** * This method performs a "measuring" reflow to get the content BSize of * aFlexItem.Frame() (treating it as if it had a computed BSize of "auto"), * and returns the resulting BSize measurement. * (Helper for ResolveAutoFlexBasisAndMinSize().) */ nscoord MeasureFlexItemContentBSize(FlexItem& aFlexItem, bool aForceBResizeForMeasuringReflow, const ReflowInput& aParentReflowInput); /** * This method resolves an "auto" flex-basis and/or min-main-size value * on aFlexItem, if needed. * (Helper for GenerateFlexItemForChild().) */ void ResolveAutoFlexBasisAndMinSize(FlexItem& aFlexItem, const ReflowInput& aItemReflowInput, const FlexboxAxisTracker& aAxisTracker); /** * This method: * - Creates FlexItems for all of our child frames (except placeholders). * - Groups those FlexItems into FlexLines. * - Returns those FlexLines in the outparam |aLines|. * * This corresponds to "Collect flex items into flex lines" step in the spec. * https://drafts.csswg.org/css-flexbox-1/#algo-line-break * * For any child frames which are placeholders, this method will instead just * append that child to the outparam |aPlaceholders| for separate handling. * (Absolutely positioned children of a flex container are *not* flex items.) */ void GenerateFlexLines(const ReflowInput& aReflowInput, const nscoord aTentativeContentBoxMainSize, const nscoord aTentativeContentBoxCrossSize, const nsTArray& aStruts, const FlexboxAxisTracker& aAxisTracker, nscoord aMainGapSize, nsTArray& aPlaceholders, nsTArray& aLines, bool& aHasCollapsedItems); /** * Generates and returns a FlexLayoutResult that contains the FlexLines and * some sizing metrics that should be used to lay out a particular flex * container continuation (i.e. don't call this on the first-in-flow). */ FlexLayoutResult GenerateFlexLayoutResult(); /** * Resolves the content-box main-size of a flex container frame, * primarily based on: * - the "tentative" main size, taken from the reflow input ("tentative" * because it may be unconstrained or may run off the page). * - the sizes of our lines of flex items. * * We assume the available block-size is always *unconstrained* because this * is called only in flex algorithm to measure the flex container's size * without regards to pagination. * * Guaranteed to return a definite length, i.e. not NS_UNCONSTRAINEDSIZE, * aside from cases with huge lengths which happen to compute to that value. * * This corresponds to "Determine the main size of the flex container" step in * the spec. https://drafts.csswg.org/css-flexbox-1/#algo-main-container * * (Note: This function should be structurally similar to * ComputeCrossSize().) */ nscoord ComputeMainSize(const ReflowInput& aReflowInput, const FlexboxAxisTracker& aAxisTracker, const nscoord aTentativeContentBoxMainSize, nsTArray& aLines) const; nscoord ComputeCrossSize(const ReflowInput& aReflowInput, const FlexboxAxisTracker& aAxisTracker, const nscoord aTentativeContentBoxCrossSize, nscoord aSumLineCrossSizes, bool* aIsDefinite) const; /** * Compute the size of the available space that we'll give to our children to * reflow into. In particular, compute the available size that we would give * to a hypothetical child placed at the IStart/BStart corner of this flex * container's content-box. * * @param aReflowInput the flex container's reflow input. * @param aBorderPadding the border and padding of this frame with the * assumption that this is the last fragment. * * @return the size of the available space for our children to reflow into. */ mozilla::LogicalSize ComputeAvailableSizeForItems( const ReflowInput& aReflowInput, const mozilla::LogicalMargin& aBorderPadding) const; void SizeItemInCrossAxis(ReflowInput& aChildReflowInput, FlexItem& aItem); /** * This method computes the metrics to be reported via the flex container's * ReflowOutput & nsReflowStatus output parameters in Reflow(). * * @param aContentBoxSize the final content-box size for the flex container as * a whole, converted from the flex container's * main/cross sizes. The main/cross sizes are computed * by DoFlexLayout() if this frame is the * first-in-flow, or are the stored ones in * SharedFlexData if this frame is a not the * first-in-flow. * @param aBorderPadding the border and padding for this frame (possibly with * some sides skipped as-appropriate, if we're in a * continuation chain). * @param aConsumedBSize the sum of our content-box block-size consumed by our * prev-in-flows. * @param aMayNeedNextInFlow true if we may need a next-in-flow because our * effective content-box block-size exceeds the * available block-size. * @param aMaxBlockEndEdgeOfChildren the maximum block-end edge of the * children of this fragment in this frame's * coordinate space (as returned by * ReflowChildren()). * @param aChildrenStatus the reflow status of children (as returned by * ReflowChildren()). * @param aFlr the result returned by DoFlexLayout. * Note: aFlr is mostly an "input" parameter, but we use * aFlr.mAscent as an "in/out" parameter; it's initially the * "tentative" flex container ascent computed in DoFlexLayout; or * nscoord_MIN if the ascent hasn't been established yet. If the * latter, this will be updated with an ascent derived from the * (WM-relative) startmost flex item (if there are any flex * items). Similar for aFlr.mAscentForLast. */ void PopulateReflowOutput( ReflowOutput& aReflowOutput, const ReflowInput& aReflowInput, nsReflowStatus& aStatus, const mozilla::LogicalSize& aContentBoxSize, const mozilla::LogicalMargin& aBorderPadding, const nscoord aConsumedBSize, const bool aMayNeedNextInFlow, const nscoord aMaxBlockEndEdgeOfChildren, const nsReflowStatus& aChildrenStatus, const FlexboxAxisTracker& aAxisTracker, FlexLayoutResult& aFlr); /** * Perform a final Reflow for our child frames. * * @param aContainerSize this frame's tentative physical border-box size, used * only for logical to physical coordinate conversion. * @param aAvailableSizeForItems the size of the available space for our * children to reflow into. * @param aBorderPadding the border and padding for this frame (possibly with * some sides skipped as-appropriate, if we're in a * continuation chain). * @param aSumOfPrevInFlowsChildrenBlockSize See the comment for * SumOfChildrenBlockSizeProperty. * @param aFlr the result returned by DoFlexLayout. * @param aFragmentData See the comment for PerFragmentFlexData. * Note: aFragmentData is an "in/out" parameter. It is * initialized by the data stored in our prev-in-flow's * PerFragmentFlexData::Prop(); its fields will then be * updated and become our PerFragmentFlexData. * @return nscoord the maximum block-end edge of children of this fragment in * flex container's coordinate space. * @return nsReflowStatus the reflow status of children (i.e. flex items). If * any child had an incomplete reflow status, then this * will be Incomplete. Otherwise, if any child had an * overflow-incomplete reflow status, this will be * OverflowIncomplete. */ std::tuple ReflowChildren( const ReflowInput& aReflowInput, const nsSize& aContainerSize, const mozilla::LogicalSize& aAvailableSizeForItems, const mozilla::LogicalMargin& aBorderPadding, const FlexboxAxisTracker& aAxisTracker, FlexLayoutResult& aFlr, PerFragmentFlexData& aFragmentData); /** * Moves the given flex item's frame to the given LogicalPosition (modulo any * relative positioning). * * This can be used in cases where we've already done a "measuring reflow" * for the flex item at the correct size, and hence can skip its final reflow * (but still need to move it to the right final position). * * @param aItem The flex item whose frame should be moved. * @param aFramePos The position where the flex item's frame should * be placed. (pre-relative positioning) * @param aContainerSize The flex container's size (required by some methods * that we call, to interpret aFramePos correctly). */ void MoveFlexItemToFinalPosition(const FlexItem& aItem, const mozilla::LogicalPoint& aFramePos, const nsSize& aContainerSize); /** * Helper-function to reflow a child frame, at its final position determined * by flex layout. * * @param aAxisTracker A FlexboxAxisTracker with the flex container's axes. * @param aReflowInput The flex container's reflow input. * @param aItem The flex item to be reflowed. * @param aFramePos The position where the flex item's frame should * be placed. (pre-relative positioning) * @param aAvailableSize The available size to reflow the child frame (in the * child frame's writing-mode). * @param aContainerSize The flex container's size (required by some methods * that we call, to interpret aFramePos correctly). * @return the child frame's reflow status. */ nsReflowStatus ReflowFlexItem(const FlexboxAxisTracker& aAxisTracker, const ReflowInput& aReflowInput, const FlexItem& aItem, const mozilla::LogicalPoint& aFramePos, const mozilla::LogicalSize& aAvailableSize, const nsSize& aContainerSize); /** * Helper-function to perform a "dummy reflow" on all our nsPlaceholderFrame * children, at the container's content-box origin. * * This doesn't actually represent the static position of the placeholders' * out-of-flow (OOF) frames -- we can't compute that until we've reflowed the * OOF, because (depending on the CSS Align properties) the static position * may be influenced by the OOF's size. So for now, we just co-opt the * placeholder to store the flex container's logical content-box origin, and * we defer to nsAbsoluteContainingBlock to determine the OOF's actual static * position (using this origin, the OOF's size, and the CSS Align * properties). * * @param aReflowInput The flex container's reflow input. * @param aPlaceholders An array of all the flex container's * nsPlaceholderFrame children. * @param aContentBoxOrigin The flex container's logical content-box * origin (in its own coordinate space). * @param aContainerSize The flex container's size (required by some * reflow methods to interpret positions correctly). */ void ReflowPlaceholders(const ReflowInput& aReflowInput, nsTArray& aPlaceholders, const mozilla::LogicalPoint& aContentBoxOrigin, const nsSize& aContainerSize); /** * Helper for GetMinISize / GetPrefISize. */ nscoord IntrinsicISize(gfxContext* aRenderingContext, mozilla::IntrinsicISizeType aType); /** * Cached values to optimize GetMinISize/GetPrefISize. */ nscoord mCachedMinISize = NS_INTRINSIC_ISIZE_UNKNOWN; nscoord mCachedPrefISize = NS_INTRINSIC_ISIZE_UNKNOWN; /** * Cached baselines computed in our last reflow to optimize * GetNaturalBaselineBOffset(). */ // Note: the first baseline is a distance from our border-box block-start // edge. nscoord mFirstBaseline = NS_INTRINSIC_ISIZE_UNKNOWN; // Note: the last baseline is a distance from our border-box block-end edge. nscoord mLastBaseline = NS_INTRINSIC_ISIZE_UNKNOWN; }; #endif /* nsFlexContainerFrame_h___ */