/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* 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 "nsCOMPtr.h" #include "nsContainerFrame.h" #include "nsBlockFrame.h" #include "nsInlineFrame.h" #include "nsMathMLAtoms.h" #include "nsMathMLOperators.h" #include "nsMathMLChar.h" #include "nsMathMLFrame.h" #include "nsMathMLParts.h" /* * 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 { friend class nsMathMLmfencedFrame; public: nsMathMLContainerFrame(nsStyleContext* aContext) : nsContainerFrame(aContext) {} NS_DECL_QUERYFRAME NS_DECL_FRAMEARENA_HELPERS // -------------------------------------------------------------------------- // Overloaded nsMathMLFrame methods -- see documentation in nsIMathMLFrame.h NS_IMETHOD Stretch(nsRenderingContext& aRenderingContext, nsStretchDirection aStretchDirection, nsBoundingMetrics& aContainerSize, nsHTMLReflowMetrics& aDesiredStretchSize); NS_IMETHOD UpdatePresentationDataFromChildAt(int32_t aFirstIndex, int32_t aLastIndex, uint32_t aFlagsValues, uint32_t aFlagsToUpdate) { PropagatePresentationDataFromChildAt(this, aFirstIndex, aLastIndex, aFlagsValues, aFlagsToUpdate); return NS_OK; } // helper to set the "increment script level" flag on the element belonging // to a child frame given by aChildIndex. // When this flag is set, the style system will increment the scriptlevel // for the child element. This is needed for situations where the style system // cannot itself determine the scriptlevel (mfrac, munder, mover, munderover). // This should be called during reflow. We set the flag and if it changed, // we request appropriate restyling and also queue a post-reflow callback // to ensure that restyle and reflow happens immediately after the current // reflow. void SetIncrementScriptLevel(int32_t aChildIndex, bool aIncrement); // -------------------------------------------------------------------------- // Overloaded nsContainerFrame methods -- see documentation in nsIFrame.h virtual bool IsFrameOfType(uint32_t aFlags) const { return !(aFlags & nsIFrame::eLineParticipant) && nsContainerFrame::IsFrameOfType(aFlags & ~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace)); } virtual int GetSkipSides() const { return 0; } NS_IMETHOD AppendFrames(ChildListID aListID, nsFrameList& aFrameList); NS_IMETHOD InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, nsFrameList& aFrameList) MOZ_OVERRIDE; NS_IMETHOD RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) MOZ_OVERRIDE; /** * Both GetMinWidth and GetPrefWidth return whatever * GetIntrinsicWidth returns. */ virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext); virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext); /** * Return the intrinsic width of the frame's content area. */ virtual nscoord GetIntrinsicWidth(nsRenderingContext *aRenderingContext); NS_IMETHOD Reflow(nsPresContext* aPresContext, nsHTMLReflowMetrics& aDesiredSize, const nsHTMLReflowState& aReflowState, nsReflowStatus& aStatus); NS_IMETHOD WillReflow(nsPresContext* aPresContext) { mPresentationData.flags &= ~NS_MATHML_ERROR; return nsContainerFrame::WillReflow(aPresContext); } NS_IMETHOD DidReflow(nsPresContext* aPresContext, const nsHTMLReflowState* aReflowState, nsDidReflowStatus aStatus) { mPresentationData.flags &= ~NS_MATHML_STRETCH_DONE; return nsContainerFrame::DidReflow(aPresContext, aReflowState, aStatus); } NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect, const nsDisplayListSet& aLists) MOZ_OVERRIDE; virtual bool UpdateOverflow(); // 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 , , , ). NS_IMETHOD AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType); // helper function to apply mirroring to a horizontal coordinate, if needed. nscoord MirrorIfRTL(nscoord aParentWidth, nscoord aChildWidth, nscoord aChildLeading) { return (NS_MATHML_IS_RTL(mPresentationData.flags) ? 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(nsRenderingContext& aRenderingContext, bool aPlaceOrigin, nsHTMLReflowMetrics& aDesiredSize); // MeasureForWidth: // // A method used by nsMathMLContainerFrame::GetIntrinsicWidth 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::GetIntrinsicWidth to measure the child frames as // if in an , and so their frames implement MeasureForWidth to use // nsMathMLContainerFrame::Place. virtual nsresult MeasureForWidth(nsRenderingContext& aRenderingContext, nsHTMLReflowMetrics& 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(nsRenderingContext& aRenderingContext, 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: // error handlers to provide a visual feedback to the user when an error // (typically invalid markup) was encountered during reflow. nsresult ReflowError(nsRenderingContext& aRenderingContext, nsHTMLReflowMetrics& aDesiredSize); // 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. nsresult ReflowChild(nsIFrame* aKidFrame, nsPresContext* aPresContext, nsHTMLReflowMetrics& aDesiredSize, const nsHTMLReflowState& aReflowState, 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(nsHTMLReflowMetrics& 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(nsRenderingContext& aRenderingContext, nsHTMLReflowMetrics& aDesiredSize); // Record metrics of a child frame for recovery through the following method static void SaveReflowAndBoundingMetricsFor(nsIFrame* aFrame, const nsHTMLReflowMetrics& aReflowMetrics, 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 GetPrefWidth(). static void GetReflowAndBoundingMetricsFor(nsIFrame* aFrame, nsHTMLReflowMetrics& aReflowMetrics, 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); // 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(nsHTMLReflowMetrics* 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); 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 : public nsBlockFrame { public: NS_DECL_FRAMEARENA_HELPERS friend nsIFrame* NS_NewMathMLmathBlockFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, uint32_t aFlags); // beware, mFrames is not set by nsBlockFrame // cannot use mFrames{.FirstChild()|.etc} since the block code doesn't set mFrames NS_IMETHOD SetInitialChildList(ChildListID aListID, nsFrameList& aChildList) { NS_ASSERTION(aListID == kPrincipalList, "unexpected frame list"); nsresult rv = nsBlockFrame::SetInitialChildList(aListID, aChildList); // re-resolve our subtree to set any mathml-expected data nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this); return rv; } NS_IMETHOD AppendFrames(ChildListID aListID, nsFrameList& aFrameList) { NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected frame list"); nsresult rv = nsBlockFrame::AppendFrames(aListID, aFrameList); if (NS_LIKELY(aListID == kPrincipalList)) nsMathMLContainerFrame::ReLayoutChildren(this); return rv; } NS_IMETHOD InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, nsFrameList& aFrameList) MOZ_OVERRIDE { NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected frame list"); nsresult rv = nsBlockFrame::InsertFrames(aListID, aPrevFrame, aFrameList); if (NS_LIKELY(aListID == kPrincipalList)) nsMathMLContainerFrame::ReLayoutChildren(this); return rv; } NS_IMETHOD RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) MOZ_OVERRIDE { NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected frame list"); nsresult rv = nsBlockFrame::RemoveFrame(aListID, aOldFrame); if (NS_LIKELY(aListID == kPrincipalList)) nsMathMLContainerFrame::ReLayoutChildren(this); return rv; } virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE { return nsBlockFrame::IsFrameOfType(aFlags & ~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace)); } protected: nsMathMLmathBlockFrame(nsStyleContext* aContext) : nsBlockFrame(aContext) { // We should always have a float manager. Not that things can really try // to float out of us anyway, but we need one for line layout. AddStateBits(NS_BLOCK_FLOAT_MGR); } virtual ~nsMathMLmathBlockFrame() {} }; // -------------- class nsMathMLmathInlineFrame : public nsInlineFrame { public: NS_DECL_FRAMEARENA_HELPERS friend nsIFrame* NS_NewMathMLmathInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); NS_IMETHOD SetInitialChildList(ChildListID aListID, nsFrameList& aChildList) { NS_ASSERTION(aListID == kPrincipalList, "unexpected frame list"); nsresult rv = nsInlineFrame::SetInitialChildList(aListID, aChildList); // re-resolve our subtree to set any mathml-expected data nsMathMLContainerFrame::RebuildAutomaticDataForChildren(this); return rv; } NS_IMETHOD AppendFrames(ChildListID aListID, nsFrameList& aFrameList) MOZ_OVERRIDE { NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected frame list"); nsresult rv = nsInlineFrame::AppendFrames(aListID, aFrameList); if (NS_LIKELY(aListID == kPrincipalList)) nsMathMLContainerFrame::ReLayoutChildren(this); return rv; } NS_IMETHOD InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, nsFrameList& aFrameList) MOZ_OVERRIDE { NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected frame list"); nsresult rv = nsInlineFrame::InsertFrames(aListID, aPrevFrame, aFrameList); if (NS_LIKELY(aListID == kPrincipalList)) nsMathMLContainerFrame::ReLayoutChildren(this); return rv; } NS_IMETHOD RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) MOZ_OVERRIDE { NS_ASSERTION(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected frame list"); nsresult rv = nsInlineFrame::RemoveFrame(aListID, aOldFrame); if (NS_LIKELY(aListID == kPrincipalList)) nsMathMLContainerFrame::ReLayoutChildren(this); return rv; } virtual bool IsFrameOfType(uint32_t aFlags) const { return nsInlineFrame::IsFrameOfType(aFlags & ~(nsIFrame::eMathML | nsIFrame::eExcludesIgnorableWhitespace)); } protected: nsMathMLmathInlineFrame(nsStyleContext* aContext) : nsInlineFrame(aContext) {} virtual ~nsMathMLmathInlineFrame() {} }; #endif /* nsMathMLContainerFrame_h___ */