/* -*- 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/. */ #ifndef nsMathMLContainerFrame_h___ #define nsMathMLContainerFrame_h___ #include "mozilla/Attributes.h" #include "nsContainerFrame.h" #include "nsBlockFrame.h" #include "nsInlineFrame.h" #include "nsMathMLOperators.h" #include "nsMathMLFrame.h" #include "mozilla/Likely.h" namespace mozilla { class PresShell; } // namespace mozilla /* * Base class for MathML container frames. It acts like an inferred * mrow. By default, this frame uses its Reflow() method to lay its * children horizontally and ensure that their baselines are aligned. * The Reflow() method relies upon Place() to position children. * By overloading Place() in derived classes, it is therefore possible * to position children in various customized ways. */ // Options for the preferred size at which to stretch our stretchy children #define STRETCH_CONSIDER_ACTUAL_SIZE 0x00000001 // just use our current size #define STRETCH_CONSIDER_EMBELLISHMENTS \ 0x00000002 // size calculations include embellishments class nsMathMLContainerFrame : public nsContainerFrame, public nsMathMLFrame { public: nsMathMLContainerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext, ClassID aID) : nsContainerFrame(aStyle, aPresContext, aID), mIntrinsicWidth(NS_INTRINSIC_ISIZE_UNKNOWN), mBlockStartAscent(0) {} NS_DECL_QUERYFRAME_TARGET(nsMathMLContainerFrame) NS_DECL_QUERYFRAME NS_DECL_ABSTRACT_FRAME(nsMathMLContainerFrame) // -------------------------------------------------------------------------- // Overloaded nsMathMLFrame methods -- see documentation in nsIMathMLFrame.h NS_IMETHOD Stretch(DrawTarget* aDrawTarget, nsStretchDirection aStretchDirection, nsBoundingMetrics& aContainerSize, ReflowOutput& aDesiredStretchSize) override; NS_IMETHOD UpdatePresentationDataFromChildAt(int32_t aFirstIndex, int32_t aLastIndex, uint32_t aFlagsValues, uint32_t aFlagsToUpdate) override { PropagatePresentationDataFromChildAt(this, aFirstIndex, aLastIndex, aFlagsValues, aFlagsToUpdate); return NS_OK; } // -------------------------------------------------------------------------- // Overloaded nsContainerFrame methods -- see documentation in nsIFrame.h void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override; void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, const nsLineList::iterator* aPrevFrameLine, nsFrameList&& aFrameList) override; void RemoveFrame(DestroyContext&, ChildListID aListID, nsIFrame* aOldFrame) override; /** * Both GetMinISize and GetPrefISize use the intrinsic width metrics * returned by GetIntrinsicMetrics, including ink overflow. */ nscoord GetMinISize(gfxContext* aRenderingContext) override; nscoord GetPrefISize(gfxContext* aRenderingContext) override; /** * Return the intrinsic horizontal metrics of the frame's content area. */ virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext, ReflowOutput& aDesiredSize); void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) override; void DidReflow(nsPresContext* aPresContext, const ReflowInput* aReflowInput) override { mPresentationData.flags &= ~NS_MATHML_STRETCH_DONE; return nsContainerFrame::DidReflow(aPresContext, aReflowInput); } void BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) override; bool ComputeCustomOverflow(mozilla::OverflowAreas& aOverflowAreas) override; void MarkIntrinsicISizesDirty() override; // Notification when an attribute is changed. The MathML module uses the // following paradigm: // // 1. If the MathML frame class doesn't have any cached automatic data that // depends on the attribute: we just reflow (e.g., this happens with // , , , etc). This is the default behavior // implemented by this base class. // // 2. If the MathML frame class has cached automatic data that depends on // the attribute: // 2a. If the automatic data to update resides only within the descendants, // we just re-layout them using ReLayoutChildren(this); // (e.g., this happens with ). // 2b. If the automatic data to update affects us in some way, we ask our // parent to re-layout its children using ReLayoutChildren(mParent); // Therefore, there is an overhead here in that our siblings are // re-laid too (e.g., this happens with , , // ). nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute, int32_t aModType) override; // helper function to apply mirroring to a horizontal coordinate, if needed. nscoord MirrorIfRTL(nscoord aParentWidth, nscoord aChildWidth, nscoord aChildLeading) { return StyleVisibility()->mDirection == mozilla::StyleDirection::Rtl ? aParentWidth - aChildWidth - aChildLeading : aChildLeading; } // -------------------------------------------------------------------------- // Additional methods protected: /* Place : * This method is used to measure or position child frames and other * elements. It may be called any number of times with aPlaceOrigin * false to measure, and the final call of the Reflow process before * returning from Reflow() or Stretch() will have aPlaceOrigin true * to position the elements. * * IMPORTANT: This method uses GetReflowAndBoundingMetricsFor() which must * have been set up with SaveReflowAndBoundingMetricsFor(). * * The Place() method will use this information to compute the desired size * of the frame. * * @param aPlaceOrigin [in] * If aPlaceOrigin is false, compute your desired size using the * information from GetReflowAndBoundingMetricsFor. However, child * frames or other elements should not be repositioned. * * If aPlaceOrigin is true, reflow is finished. You should position * all your children, and return your desired size. You should now * use FinishReflowChild() on your children to complete post-reflow * operations. * * @param aDesiredSize [out] parameter where you should return your desired * size and your ascent/descent info. Compute your desired size using * the information from GetReflowAndBoundingMetricsFor, and include * any space you want for border/padding in the desired size you * return. */ virtual nsresult Place(DrawTarget* aDrawTarget, bool aPlaceOrigin, ReflowOutput& aDesiredSize); // MeasureForWidth: // // A method used by nsMathMLContainerFrame::GetIntrinsicISize to get the // width that a particular Place method desires. For most frames, this will // just call the object's Place method. However and use // nsMathMLContainerFrame::GetIntrinsicISize to measure the child frames as // if in an , and so their frames implement MeasureForWidth to use // nsMathMLContainerFrame::Place. virtual nsresult MeasureForWidth(DrawTarget* aDrawTarget, ReflowOutput& aDesiredSize); // helper to re-sync the automatic data in our children and notify our parent // to reflow us when changes (e.g., append/insert/remove) happen in our child // list virtual nsresult ChildListChanged(int32_t aModType); // helper to get the preferred size that a container frame should use to fire // the stretch on its stretchy child frames. void GetPreferredStretchSize(DrawTarget* aDrawTarget, uint32_t aOptions, nsStretchDirection aStretchDirection, nsBoundingMetrics& aPreferredStretchSize); // helper used by mstyle, mphantom, mpadded and mrow in their implementation // of TransmitAutomaticData() to determine whether they are space-like. nsresult TransmitAutomaticDataForMrowLikeElement(); public: /* * Helper to render the frame as a default mrow-like container when an error * (typically invalid markup) was encountered during reflow. Parameters are * the same as Place(). */ nsresult PlaceAsMrow(DrawTarget* aDrawTarget, bool aPlaceOrigin, ReflowOutput& aDesiredSize); /* * Helper to call ReportErrorToConsole for parse errors involving * attribute/value pairs. * @param aAttribute The attribute for which the parse error occured. * @param aValue The value for which the parse error occured. */ nsresult ReportParseError(const char16_t* aAttribute, const char16_t* aValue); /* * Helper to call ReportErrorToConsole when certain tags * have more than the expected amount of children. */ nsresult ReportChildCountError(); /* * Helper to call ReportErrorToConsole when certain tags have * invalid child tags * @param aChildTag The tag which is forbidden in this context */ nsresult ReportInvalidChildError(nsAtom* aChildTag); /* * Helper to call ReportToConsole when an error occurs. * @param aParams see nsContentUtils::ReportToConsole */ nsresult ReportErrorToConsole( const char* aErrorMsgId, const nsTArray& aParams = nsTArray()); // helper method to reflow a child frame. We are inline frames, and we don't // know our positions until reflow is finished. That's why we ask the // base method not to worry about our position. void ReflowChild(nsIFrame* aKidFrame, nsPresContext* aPresContext, ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput, nsReflowStatus& aStatus); protected: // helper to add the inter-spacing when is the immediate parent. // Since we don't (yet) handle the root element ourselves, we need to // take special care of the inter-frame spacing on elements for which // is the direct xml parent. This function will be repeatedly called from // left to right on the childframes of , and by so doing it will // emulate the spacing that would have been done by a container. // e.g., it fixes f q f I virtual nscoord FixInterFrameSpacing(ReflowOutput& aDesiredSize); // helper method to complete the post-reflow hook and ensure that embellished // operators don't terminate their Reflow without receiving a Stretch command. virtual nsresult FinalizeReflow(DrawTarget* aDrawTarget, ReflowOutput& aDesiredSize); // Record metrics of a child frame for recovery through the following method static void SaveReflowAndBoundingMetricsFor( nsIFrame* aFrame, const ReflowOutput& aReflowOutput, const nsBoundingMetrics& aBoundingMetrics); // helper method to facilitate getting the reflow and bounding metrics of a // child frame. The argument aMathMLFrameType, when non null, will return // the 'type' of the frame, which is used to determine the inter-frame // spacing. // IMPORTANT: This function is only meant to be called in Place() methods as // the information is available only when set up with the above method // during Reflow/Stretch() and GetPrefISize(). static void GetReflowAndBoundingMetricsFor( nsIFrame* aFrame, ReflowOutput& aReflowOutput, nsBoundingMetrics& aBoundingMetrics, eMathMLFrameType* aMathMLFrameType = nullptr); // helper method to clear metrics saved with // SaveReflowAndBoundingMetricsFor() from all child frames. void ClearSavedChildMetrics(); // helper to let the update of presentation data pass through // a subtree that may contain non-MathML container frames static void PropagatePresentationDataFor(nsIFrame* aFrame, uint32_t aFlagsValues, uint32_t aFlagsToUpdate); public: static void PropagatePresentationDataFromChildAt(nsIFrame* aParentFrame, int32_t aFirstChildIndex, int32_t aLastChildIndex, uint32_t aFlagsValues, uint32_t aFlagsToUpdate); // Sets flags on aFrame and all descendant frames static void PropagateFrameFlagFor(nsIFrame* aFrame, nsFrameState aFlags); // helper to let the rebuild of automatic data (presentation data // and embellishement data) walk through a subtree that may contain // non-MathML container frames. Note that this method re-builds the // automatic data in the children -- not in aParentFrame itself (except // for those particular operations that the parent frame may do in its // TransmitAutomaticData()). The reason it works this way is because // a container frame knows what it wants for its children, whereas children // have no clue who their parent is. For example, it is who knows // that its children have to be in scriptsizes, and has to transmit this // information to them. Hence, when changes occur in a child frame, the child // has to request the re-build from its parent. Unfortunately, the extra cost // for this is that it will re-sync in the siblings of the child as well. static void RebuildAutomaticDataForChildren(nsIFrame* aParentFrame); // helper to blow away the automatic data cached in a frame's subtree and // re-layout its subtree to reflect changes that may have happen. In the // event where aParentFrame isn't a MathML frame, it will first walk up to // the ancestor that is a MathML frame, and re-layout from there -- this is // to guarantee that automatic data will be rebuilt properly. Note that this // method re-builds the automatic data in the children -- not in the parent // frame itself (except for those particular operations that the parent frame // may do do its TransmitAutomaticData()). @see // RebuildAutomaticDataForChildren // // aBits are the bits to pass to FrameNeedsReflow() when we call it. static nsresult ReLayoutChildren(nsIFrame* aParentFrame); protected: // Helper method which positions child frames as an on given baseline // y = aBaseline starting from x = aOffsetX, calling FinishReflowChild() // on the frames. void PositionRowChildFrames(nscoord aOffsetX, nscoord aBaseline); // A variant on FinishAndStoreOverflow() that uses the union of child // overflows, the frame bounds, and mBoundingMetrics to set and store the // overflow. void GatherAndStoreOverflow(ReflowOutput* aMetrics); /** * Call DidReflow() if the NS_FRAME_IN_REFLOW frame bit is set on aFirst and * all its next siblings up to, but not including, aStop. * aStop == nullptr meaning all next siblings with the bit set. * The method does nothing if aFirst == nullptr. */ static void DidReflowChildren(nsIFrame* aFirst, nsIFrame* aStop = nullptr); /** * Recompute mIntrinsicWidth if it's not already up to date. */ void UpdateIntrinsicWidth(gfxContext* aRenderingContext); nscoord mIntrinsicWidth; nscoord mBlockStartAscent; private: class RowChildFrameIterator; friend class RowChildFrameIterator; }; // -------------------------------------------------------------------------- // Currently, to benefit from line-breaking inside the element, is // simply mapping to nsBlockFrame or nsInlineFrame. // A separate implemention needs to provide: // 1) line-breaking // 2) proper inter-frame spacing // 3) firing of Stretch() (in which case FinalizeReflow() would have to be // cleaned) // Issues: If/when mathml becomes a pluggable component, the separation will be // needed. class nsMathMLmathBlockFrame final : public nsBlockFrame { public: NS_DECL_QUERYFRAME NS_DECL_FRAMEARENA_HELPERS(nsMathMLmathBlockFrame) friend nsContainerFrame* NS_NewMathMLmathBlockFrame( mozilla::PresShell* aPresShell, ComputedStyle* aStyle); // beware, mFrames is not set by nsBlockFrame // cannot use mFrames{.FirstChild()|.etc} since the block code doesn't set // mFrames void SetInitialChildList(ChildListID aListID, nsFrameList&& aChildList) override { MOZ_ASSERT(aListID == mozilla::FrameChildListID::Principal || aListID == mozilla::FrameChildListID::Backdrop, "unexpected frame list"); nsBlockFrame::SetInitialChildList(aListID, std::move(aChildList)); if (aListID == mozilla::FrameChildListID::Principal) { // re-resolve our subtree to set any mathml-expected data nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this); } } void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override { NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal || aListID == mozilla::FrameChildListID::NoReflowPrincipal, "unexpected frame list"); nsBlockFrame::AppendFrames(aListID, std::move(aFrameList)); if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) { nsMathMLContainerFrame::ReLayoutChildren(this); } } void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, const nsLineList::iterator* aPrevFrameLine, nsFrameList&& aFrameList) override { NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal || aListID == mozilla::FrameChildListID::NoReflowPrincipal, "unexpected frame list"); nsBlockFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine, std::move(aFrameList)); if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) { nsMathMLContainerFrame::ReLayoutChildren(this); } } void RemoveFrame(DestroyContext& aContext, ChildListID aListID, nsIFrame* aOldFrame) override { NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal || aListID == mozilla::FrameChildListID::NoReflowPrincipal, "unexpected frame list"); nsBlockFrame::RemoveFrame(aContext, aListID, aOldFrame); if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) { nsMathMLContainerFrame::ReLayoutChildren(this); } } // See nsIMathMLFrame.h bool IsMrowLike() { return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild(); } protected: explicit nsMathMLmathBlockFrame(ComputedStyle* aStyle, nsPresContext* aPresContext) : nsBlockFrame(aStyle, aPresContext, kClassID) { } virtual ~nsMathMLmathBlockFrame() = default; }; // -------------- class nsMathMLmathInlineFrame final : public nsInlineFrame, public nsMathMLFrame { public: NS_DECL_QUERYFRAME NS_DECL_FRAMEARENA_HELPERS(nsMathMLmathInlineFrame) friend nsContainerFrame* NS_NewMathMLmathInlineFrame( mozilla::PresShell* aPresShell, ComputedStyle* aStyle); void SetInitialChildList(ChildListID aListID, nsFrameList&& aChildList) override { NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal, "unexpected frame list"); nsInlineFrame::SetInitialChildList(aListID, std::move(aChildList)); // re-resolve our subtree to set any mathml-expected data nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this); } void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override { NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal || aListID == mozilla::FrameChildListID::NoReflowPrincipal, "unexpected frame list"); nsInlineFrame::AppendFrames(aListID, std::move(aFrameList)); if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) { nsMathMLContainerFrame::ReLayoutChildren(this); } } void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, const nsLineList::iterator* aPrevFrameLine, nsFrameList&& aFrameList) override { NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal || aListID == mozilla::FrameChildListID::NoReflowPrincipal, "unexpected frame list"); nsInlineFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine, std::move(aFrameList)); if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) { nsMathMLContainerFrame::ReLayoutChildren(this); } } void RemoveFrame(DestroyContext& aContext, ChildListID aListID, nsIFrame* aOldFrame) override { NS_ASSERTION(aListID == mozilla::FrameChildListID::Principal || aListID == mozilla::FrameChildListID::NoReflowPrincipal, "unexpected frame list"); nsInlineFrame::RemoveFrame(aContext, aListID, aOldFrame); if (MOZ_LIKELY(aListID == mozilla::FrameChildListID::Principal)) { nsMathMLContainerFrame::ReLayoutChildren(this); } } bool IsMrowLike() override { return mFrames.FirstChild() != mFrames.LastChild() || !mFrames.FirstChild(); } protected: explicit nsMathMLmathInlineFrame(ComputedStyle* aStyle, nsPresContext* aPresContext) : nsInlineFrame(aStyle, aPresContext, kClassID) {} virtual ~nsMathMLmathInlineFrame() = default; }; #endif /* nsMathMLContainerFrame_h___ */