/* -*- 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/. */ #include "nsMathMLContainerFrame.h" #include "gfxUtils.h" #include "mozilla/gfx/2D.h" #include "nsLayoutUtils.h" #include "nsPresContext.h" #include "nsIPresShell.h" #include "nsStyleContext.h" #include "nsNameSpaceManager.h" #include "nsRenderingContext.h" #include "nsIDOMMutationEvent.h" #include "nsGkAtoms.h" #include "nsDisplayList.h" #include "nsIReflowCallback.h" #include "mozilla/Likely.h" #include "nsIScriptError.h" #include "nsContentUtils.h" #include "nsMathMLElement.h" using namespace mozilla; using namespace mozilla::gfx; // // nsMathMLContainerFrame implementation // NS_QUERYFRAME_HEAD(nsMathMLContainerFrame) NS_QUERYFRAME_ENTRY(nsIMathMLFrame) NS_QUERYFRAME_ENTRY(nsMathMLContainerFrame) NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) // ============================================================================= // error handlers // provide a feedback to the user when a frame with bad markup can not be rendered nsresult nsMathMLContainerFrame::ReflowError(DrawTarget* aDrawTarget, ReflowOutput& aDesiredSize) { // clear all other flags and record that there is an error with this frame mEmbellishData.flags = 0; mPresentationData.flags = NS_MATHML_ERROR; /////////////// // Set font RefPtr fm = nsLayoutUtils::GetInflatedFontMetricsForFrame(this); // bounding metrics nsAutoString errorMsg; errorMsg.AssignLiteral("invalid-markup"); mBoundingMetrics = nsLayoutUtils::AppUnitBoundsOfString(errorMsg.get(), errorMsg.Length(), *fm, aDrawTarget); // reflow metrics WritingMode wm = aDesiredSize.GetWritingMode(); aDesiredSize.SetBlockStartAscent(fm->MaxAscent()); nscoord descent = fm->MaxDescent(); aDesiredSize.BSize(wm) = aDesiredSize.BlockStartAscent() + descent; aDesiredSize.ISize(wm) = mBoundingMetrics.width; // Also return our bounding metrics aDesiredSize.mBoundingMetrics = mBoundingMetrics; return NS_OK; } class nsDisplayMathMLError : public nsDisplayItem { public: nsDisplayMathMLError(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) : nsDisplayItem(aBuilder, aFrame) { MOZ_COUNT_CTOR(nsDisplayMathMLError); } #ifdef NS_BUILD_REFCNT_LOGGING virtual ~nsDisplayMathMLError() { MOZ_COUNT_DTOR(nsDisplayMathMLError); } #endif virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override; NS_DISPLAY_DECL_NAME("MathMLError", TYPE_MATHML_ERROR) }; void nsDisplayMathMLError::Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) { // Set color and font ... RefPtr fm = nsLayoutUtils::GetFontMetricsForFrame(mFrame, 1.0f); nsPoint pt = ToReferenceFrame(); int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel(); DrawTarget* drawTarget = aCtx->GetDrawTarget(); Rect rect = NSRectToSnappedRect(nsRect(pt, mFrame->GetSize()), appUnitsPerDevPixel, *drawTarget); ColorPattern red(ToDeviceColor(Color(1.f, 0.f, 0.f, 1.f))); drawTarget->FillRect(rect, red); aCtx->ThebesContext()->SetColor(Color(1.f, 1.f, 1.f)); nscoord ascent = fm->MaxAscent(); NS_NAMED_LITERAL_STRING(errorMsg, "invalid-markup"); nsLayoutUtils::DrawUniDirString(errorMsg.get(), uint32_t(errorMsg.Length()), nsPoint(pt.x, pt.y + ascent), *fm, *aCtx); } /* ///////////// * nsIMathMLFrame - support methods for stretchy elements * ============================================================================= */ static bool IsForeignChild(const nsIFrame* aFrame) { // This counts nsMathMLmathBlockFrame as a foreign child, because it // uses block reflow return !(aFrame->IsFrameOfType(nsIFrame::eMathML)) || aFrame->GetType() == nsGkAtoms::blockFrame; } NS_DECLARE_FRAME_PROPERTY_DELETABLE(HTMLReflowOutputProperty, ReflowOutput) /* static */ void nsMathMLContainerFrame::SaveReflowAndBoundingMetricsFor(nsIFrame* aFrame, const ReflowOutput& aReflowOutput, const nsBoundingMetrics& aBoundingMetrics) { ReflowOutput* reflowOutput = new ReflowOutput(aReflowOutput); reflowOutput->mBoundingMetrics = aBoundingMetrics; aFrame->SetProperty(HTMLReflowOutputProperty(), reflowOutput); } // helper method to facilitate getting the reflow and bounding metrics /* static */ void nsMathMLContainerFrame::GetReflowAndBoundingMetricsFor(nsIFrame* aFrame, ReflowOutput& aReflowOutput, nsBoundingMetrics& aBoundingMetrics, eMathMLFrameType* aMathMLFrameType) { NS_PRECONDITION(aFrame, "null arg"); ReflowOutput* reflowOutput = aFrame->GetProperty(HTMLReflowOutputProperty()); // IMPORTANT: This function is only meant to be called in Place() methods // where it is assumed that SaveReflowAndBoundingMetricsFor has recorded the // information. NS_ASSERTION(reflowOutput, "Didn't SaveReflowAndBoundingMetricsFor frame!"); if (reflowOutput) { aReflowOutput = *reflowOutput; aBoundingMetrics = reflowOutput->mBoundingMetrics; } if (aMathMLFrameType) { if (!IsForeignChild(aFrame)) { nsIMathMLFrame* mathMLFrame = do_QueryFrame(aFrame); if (mathMLFrame) { *aMathMLFrameType = mathMLFrame->GetMathMLFrameType(); return; } } *aMathMLFrameType = eMathMLFrameType_UNKNOWN; } } void nsMathMLContainerFrame::ClearSavedChildMetrics() { nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { childFrame->DeleteProperty(HTMLReflowOutputProperty()); childFrame = childFrame->GetNextSibling(); } } // helper to get the preferred size that a container frame should use to fire // the stretch on its stretchy child frames. void nsMathMLContainerFrame::GetPreferredStretchSize(DrawTarget* aDrawTarget, uint32_t aOptions, nsStretchDirection aStretchDirection, nsBoundingMetrics& aPreferredStretchSize) { if (aOptions & STRETCH_CONSIDER_ACTUAL_SIZE) { // when our actual size is ok, just use it aPreferredStretchSize = mBoundingMetrics; } else if (aOptions & STRETCH_CONSIDER_EMBELLISHMENTS) { // compute our up-to-date size using Place() ReflowOutput reflowOutput(GetWritingMode()); Place(aDrawTarget, false, reflowOutput); aPreferredStretchSize = reflowOutput.mBoundingMetrics; } else { // compute a size that includes embellishments iff the container stretches // in the same direction as the embellished operator. bool stretchAll = aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL ? NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) : NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags); NS_ASSERTION(aStretchDirection == NS_STRETCH_DIRECTION_HORIZONTAL || aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL, "You must specify a direction in which to stretch"); NS_ASSERTION(NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags) || stretchAll, "invalid call to GetPreferredStretchSize"); bool firstTime = true; nsBoundingMetrics bm, bmChild; nsIFrame* childFrame = stretchAll ? PrincipalChildList().FirstChild() : mPresentationData.baseFrame; while (childFrame) { // initializations in case this child happens not to be a MathML frame nsIMathMLFrame* mathMLFrame = do_QueryFrame(childFrame); if (mathMLFrame) { nsEmbellishData embellishData; nsPresentationData presentationData; mathMLFrame->GetEmbellishData(embellishData); mathMLFrame->GetPresentationData(presentationData); if (NS_MATHML_IS_EMBELLISH_OPERATOR(embellishData.flags) && embellishData.direction == aStretchDirection && presentationData.baseFrame) { // embellishements are not included, only consider the inner first child itself // XXXkt Does that mean the core descendent frame should be used // instead of the base child? nsIMathMLFrame* mathMLchildFrame = do_QueryFrame(presentationData.baseFrame); if (mathMLchildFrame) { mathMLFrame = mathMLchildFrame; } } mathMLFrame->GetBoundingMetrics(bmChild); } else { ReflowOutput unused(GetWritingMode()); GetReflowAndBoundingMetricsFor(childFrame, unused, bmChild); } if (firstTime) { firstTime = false; bm = bmChild; if (!stretchAll) { // we may get here for cases such as ... ... , // or ....... break; } } else { if (aStretchDirection == NS_STRETCH_DIRECTION_HORIZONTAL) { // if we get here, it means this is container that will stack its children // vertically and fire an horizontal stretch on each them. This is the case // for \munder, \mover, \munderover. We just sum-up the size vertically. bm.descent += bmChild.ascent + bmChild.descent; // Sometimes non-spacing marks (when width is zero) are positioned // to the left of the origin, but it is the distance between left // and right bearing that is important rather than the offsets from // the origin. if (bmChild.width == 0) { bmChild.rightBearing -= bmChild.leftBearing; bmChild.leftBearing = 0; } if (bm.leftBearing > bmChild.leftBearing) bm.leftBearing = bmChild.leftBearing; if (bm.rightBearing < bmChild.rightBearing) bm.rightBearing = bmChild.rightBearing; } else if (aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL) { // just sum-up the sizes horizontally. bm += bmChild; } else { NS_ERROR("unexpected case in GetPreferredStretchSize"); break; } } childFrame = childFrame->GetNextSibling(); } aPreferredStretchSize = bm; } } NS_IMETHODIMP nsMathMLContainerFrame::Stretch(DrawTarget* aDrawTarget, nsStretchDirection aStretchDirection, nsBoundingMetrics& aContainerSize, ReflowOutput& aDesiredStretchSize) { if (NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags)) { if (NS_MATHML_STRETCH_WAS_DONE(mPresentationData.flags)) { NS_WARNING("it is wrong to fire stretch more than once on a frame"); return NS_OK; } mPresentationData.flags |= NS_MATHML_STRETCH_DONE; if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) { NS_WARNING("it is wrong to fire stretch on a erroneous frame"); return NS_OK; } // Pass the stretch to the base child ... nsIFrame* baseFrame = mPresentationData.baseFrame; if (baseFrame) { nsIMathMLFrame* mathMLFrame = do_QueryFrame(baseFrame); NS_ASSERTION(mathMLFrame, "Something is wrong somewhere"); if (mathMLFrame) { // And the trick is that the child's rect.x is still holding the descent, // and rect.y is still holding the ascent ... ReflowOutput childSize(aDesiredStretchSize); GetReflowAndBoundingMetricsFor(baseFrame, childSize, childSize.mBoundingMetrics); // See if we should downsize and confine the stretch to us... // XXX there may be other cases where we can downsize the stretch, // e.g., the first ∑ might appear big in the following situation // // // // ∑ab // ∑ab // // // nsBoundingMetrics containerSize = aContainerSize; if (aStretchDirection != mEmbellishData.direction && mEmbellishData.direction != NS_STRETCH_DIRECTION_UNSUPPORTED) { NS_ASSERTION(mEmbellishData.direction != NS_STRETCH_DIRECTION_DEFAULT, "Stretches may have a default direction, operators can not."); if (mEmbellishData.direction == NS_STRETCH_DIRECTION_VERTICAL ? NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) : NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags)) { GetPreferredStretchSize(aDrawTarget, 0, mEmbellishData.direction, containerSize); // Stop further recalculations aStretchDirection = mEmbellishData.direction; } else { // We aren't going to stretch the child, so just use the child metrics. containerSize = childSize.mBoundingMetrics; } } // do the stretching... mathMLFrame->Stretch(aDrawTarget, aStretchDirection, containerSize, childSize); // store the updated metrics SaveReflowAndBoundingMetricsFor(baseFrame, childSize, childSize.mBoundingMetrics); // Remember the siblings which were _deferred_. // Now that this embellished child may have changed, we need to // fire the stretch on its siblings using our updated size if (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) || NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags)) { nsStretchDirection stretchDir = NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) ? NS_STRETCH_DIRECTION_VERTICAL : NS_STRETCH_DIRECTION_HORIZONTAL; GetPreferredStretchSize(aDrawTarget, STRETCH_CONSIDER_EMBELLISHMENTS, stretchDir, containerSize); nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { if (childFrame != mPresentationData.baseFrame) { mathMLFrame = do_QueryFrame(childFrame); if (mathMLFrame) { // retrieve the metrics that was stored at the previous pass GetReflowAndBoundingMetricsFor(childFrame, childSize, childSize.mBoundingMetrics); // do the stretching... mathMLFrame->Stretch(aDrawTarget, stretchDir, containerSize, childSize); // store the updated metrics SaveReflowAndBoundingMetricsFor(childFrame, childSize, childSize.mBoundingMetrics); } } childFrame = childFrame->GetNextSibling(); } } // re-position all our children nsresult rv = Place(aDrawTarget, true, aDesiredStretchSize); if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) { // Make sure the child frames get their DidReflow() calls. DidReflowChildren(mFrames.FirstChild()); } // If our parent is not embellished, it means we are the outermost embellished // container and so we put the spacing, otherwise we don't include the spacing, // the outermost embellished container will take care of it. nsEmbellishData parentData; GetEmbellishDataFrom(GetParent(), parentData); // ensure that we are the embellished child, not just a sibling // (need to test coreFrame since resets other things) if (parentData.coreFrame != mEmbellishData.coreFrame) { // (we fetch values from the core since they may use units that depend // on style data, and style changes could have occurred in the core since // our last visit there) nsEmbellishData coreData; GetEmbellishDataFrom(mEmbellishData.coreFrame, coreData); mBoundingMetrics.width += coreData.leadingSpace + coreData.trailingSpace; aDesiredStretchSize.Width() = mBoundingMetrics.width; aDesiredStretchSize.mBoundingMetrics.width = mBoundingMetrics.width; nscoord dx = (StyleVisibility()->mDirection ? coreData.trailingSpace : coreData.leadingSpace); if (dx != 0) { mBoundingMetrics.leftBearing += dx; mBoundingMetrics.rightBearing += dx; aDesiredStretchSize.mBoundingMetrics.leftBearing += dx; aDesiredStretchSize.mBoundingMetrics.rightBearing += dx; nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { childFrame->SetPosition(childFrame->GetPosition() + nsPoint(dx, 0)); childFrame = childFrame->GetNextSibling(); } } } // Finished with these: ClearSavedChildMetrics(); // Set our overflow area GatherAndStoreOverflow(&aDesiredStretchSize); } } } return NS_OK; } nsresult nsMathMLContainerFrame::FinalizeReflow(DrawTarget* aDrawTarget, ReflowOutput& aDesiredSize) { // During reflow, we use rect.x and rect.y as placeholders for the child's ascent // and descent in expectation of a stretch command. Hence we need to ensure that // a stretch command will actually be fired later on, after exiting from our // reflow. If the stretch is not fired, the rect.x, and rect.y will remain // with inappropriate data causing children to be improperly positioned. // This helper method checks to see if our parent will fire a stretch command // targeted at us. If not, we go ahead and fire an involutive stretch on // ourselves. This will clear all the rect.x and rect.y, and return our // desired size. // First, complete the post-reflow hook. // We use the information in our children rectangles to position them. // If placeOrigin==false, then Place() will not touch rect.x, and rect.y. // They will still be holding the ascent and descent for each child. // The first clause caters for any non-embellished container. // The second clause is for a container which won't fire stretch even though it is // embellished, e.g., as in ... ... , the test is convoluted // because it excludes the particular case of the core ... itself. // ( needs to fire stretch on its MathMLChar in any case to initialize it) bool placeOrigin = !NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags) || (mEmbellishData.coreFrame != this && !mPresentationData.baseFrame && mEmbellishData.direction == NS_STRETCH_DIRECTION_UNSUPPORTED); nsresult rv = Place(aDrawTarget, placeOrigin, aDesiredSize); // Place() will call FinishReflowChild() when placeOrigin is true but if // it returns before reaching FinishReflowChild() due to errors we need // to fulfill the reflow protocol by calling DidReflow for the child frames // that still needs it here (or we may crash - bug 366012). // If placeOrigin is false we should reach Place() with aPlaceOrigin == true // through Stretch() eventually. if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) { GatherAndStoreOverflow(&aDesiredSize); DidReflowChildren(PrincipalChildList().FirstChild()); return rv; } bool parentWillFireStretch = false; if (!placeOrigin) { // This means the rect.x and rect.y of our children were not set!! // Don't go without checking to see if our parent will later fire a Stretch() command // targeted at us. The Stretch() will cause the rect.x and rect.y to clear... nsIMathMLFrame* mathMLFrame = do_QueryFrame(GetParent()); if (mathMLFrame) { nsEmbellishData embellishData; nsPresentationData presentationData; mathMLFrame->GetEmbellishData(embellishData); mathMLFrame->GetPresentationData(presentationData); if (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(presentationData.flags) || NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(presentationData.flags) || (NS_MATHML_IS_EMBELLISH_OPERATOR(embellishData.flags) && presentationData.baseFrame == this)) { parentWillFireStretch = true; } } if (!parentWillFireStretch) { // There is nobody who will fire the stretch for us, we do it ourselves! bool stretchAll = /* NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) || */ NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags); nsStretchDirection stretchDir; if (mEmbellishData.coreFrame == this || /* case of a bare ... itself */ (mEmbellishData.direction == NS_STRETCH_DIRECTION_HORIZONTAL && stretchAll) || /* or ......, or friends */ mEmbellishData.direction == NS_STRETCH_DIRECTION_UNSUPPORTED) { /* Doesn't stretch */ stretchDir = mEmbellishData.direction; } else { // Let the Stretch() call decide the direction. stretchDir = NS_STRETCH_DIRECTION_DEFAULT; } // Use our current size as computed earlier by Place() // The stretch call will detect if this is incorrect and recalculate the size. nsBoundingMetrics defaultSize = aDesiredSize.mBoundingMetrics; Stretch(aDrawTarget, stretchDir, defaultSize, aDesiredSize); #ifdef DEBUG { // The Place() call above didn't request FinishReflowChild(), // so let's check that we eventually did through Stretch(). for (nsIFrame* childFrame : PrincipalChildList()) { NS_ASSERTION(!(childFrame->GetStateBits() & NS_FRAME_IN_REFLOW), "DidReflow() was never called"); } } #endif } } // Also return our bounding metrics aDesiredSize.mBoundingMetrics = mBoundingMetrics; // see if we should fix the spacing FixInterFrameSpacing(aDesiredSize); if (!parentWillFireStretch) { // Not expecting a stretch. // Finished with these: ClearSavedChildMetrics(); // Set our overflow area. GatherAndStoreOverflow(&aDesiredSize); } return NS_OK; } /* ///////////// * nsIMathMLFrame - support methods for scripting elements (nested frames * within msub, msup, msubsup, munder, mover, munderover, mmultiscripts, * mfrac, mroot, mtable). * ============================================================================= */ // helper to let the update of presentation data pass through // a subtree that may contain non-mathml container frames /* static */ void nsMathMLContainerFrame::PropagatePresentationDataFor(nsIFrame* aFrame, uint32_t aFlagsValues, uint32_t aFlagsToUpdate) { if (!aFrame || !aFlagsToUpdate) return; nsIMathMLFrame* mathMLFrame = do_QueryFrame(aFrame); if (mathMLFrame) { // update mathMLFrame->UpdatePresentationData(aFlagsValues, aFlagsToUpdate); // propagate using the base method to make sure that the control // is passed on to MathML frames that may be overloading the method mathMLFrame->UpdatePresentationDataFromChildAt(0, -1, aFlagsValues, aFlagsToUpdate); } else { // propagate down the subtrees for (nsIFrame* childFrame : aFrame->PrincipalChildList()) { PropagatePresentationDataFor(childFrame, aFlagsValues, aFlagsToUpdate); } } } /* static */ void nsMathMLContainerFrame::PropagatePresentationDataFromChildAt(nsIFrame* aParentFrame, int32_t aFirstChildIndex, int32_t aLastChildIndex, uint32_t aFlagsValues, uint32_t aFlagsToUpdate) { if (!aParentFrame || !aFlagsToUpdate) return; int32_t index = 0; for (nsIFrame* childFrame : aParentFrame->PrincipalChildList()) { if ((index >= aFirstChildIndex) && ((aLastChildIndex <= 0) || ((aLastChildIndex > 0) && (index <= aLastChildIndex)))) { PropagatePresentationDataFor(childFrame, aFlagsValues, aFlagsToUpdate); } index++; } } /* ////////////////// * Frame construction * ============================================================================= */ void nsMathMLContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) { // report an error if something wrong was found in this frame if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) { if (!IsVisibleForPainting(aBuilder)) return; aLists.Content()->AppendNewToTop( new (aBuilder) nsDisplayMathMLError(aBuilder, this)); return; } DisplayBorderBackgroundOutline(aBuilder, aLists); BuildDisplayListForNonBlockChildren(aBuilder, aLists, DISPLAY_CHILD_INLINE); #if defined(DEBUG) && defined(SHOW_BOUNDING_BOX) // for visual debug // ---------------- // if you want to see your bounding box, make sure to properly fill // your mBoundingMetrics and mReference point, and set // mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS // in the Init() of your sub-class DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics, aLists); #endif } // 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()). /* static */ void nsMathMLContainerFrame::RebuildAutomaticDataForChildren(nsIFrame* aParentFrame) { // 1. As we descend the tree, make each child frame inherit data from // the parent // 2. As we ascend the tree, transmit any specific change that we want // down the subtrees for (nsIFrame* childFrame : aParentFrame->PrincipalChildList()) { nsIMathMLFrame* childMathMLFrame = do_QueryFrame(childFrame); if (childMathMLFrame) { childMathMLFrame->InheritAutomaticData(aParentFrame); } RebuildAutomaticDataForChildren(childFrame); } nsIMathMLFrame* mathMLFrame = do_QueryFrame(aParentFrame); if (mathMLFrame) { mathMLFrame->TransmitAutomaticData(); } } /* static */ nsresult nsMathMLContainerFrame::ReLayoutChildren(nsIFrame* aParentFrame) { if (!aParentFrame) return NS_OK; // walk-up to the first frame that is a MathML frame, stop if we reach nsIFrame* frame = aParentFrame; while (1) { nsIFrame* parent = frame->GetParent(); if (!parent || !parent->GetContent()) break; // stop if it is a MathML frame nsIMathMLFrame* mathMLFrame = do_QueryFrame(frame); if (mathMLFrame) break; // stop if we reach the root tag nsIContent* content = frame->GetContent(); NS_ASSERTION(content, "dangling frame without a content node"); if (!content) break; if (content->IsMathMLElement(nsGkAtoms::math)) break; frame = parent; } // re-sync the presentation data and embellishment data of our children RebuildAutomaticDataForChildren(frame); // Ask our parent frame to reflow us nsIFrame* parent = frame->GetParent(); NS_ASSERTION(parent, "No parent to pass the reflow request up to"); if (!parent) return NS_OK; frame->PresContext()->PresShell()-> FrameNeedsReflow(frame, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY); return NS_OK; } // There are precise rules governing children of a MathML frame, // and properties such as the scriptlevel depends on those rules. // Hence for things to work, callers must use Append/Insert/etc wisely. nsresult nsMathMLContainerFrame::ChildListChanged(int32_t aModType) { // If this is an embellished frame we need to rebuild the // embellished hierarchy by walking-up to the parent of the // outermost embellished container. nsIFrame* frame = this; if (mEmbellishData.coreFrame) { nsIFrame* parent = GetParent(); nsEmbellishData embellishData; for ( ; parent; frame = parent, parent = parent->GetParent()) { GetEmbellishDataFrom(parent, embellishData); if (embellishData.coreFrame != mEmbellishData.coreFrame) break; } } return ReLayoutChildren(frame); } void nsMathMLContainerFrame::AppendFrames(ChildListID aListID, nsFrameList& aFrameList) { MOZ_ASSERT(aListID == kPrincipalList); mFrames.AppendFrames(this, aFrameList); ChildListChanged(nsIDOMMutationEvent::ADDITION); } void nsMathMLContainerFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, nsFrameList& aFrameList) { MOZ_ASSERT(aListID == kPrincipalList); mFrames.InsertFrames(this, aPrevFrame, aFrameList); ChildListChanged(nsIDOMMutationEvent::ADDITION); } void nsMathMLContainerFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) { MOZ_ASSERT(aListID == kPrincipalList); mFrames.DestroyFrame(aOldFrame); ChildListChanged(nsIDOMMutationEvent::REMOVAL); } nsresult nsMathMLContainerFrame::AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) { // XXX Since they are numerous MathML attributes that affect layout, and // we can't check all of them here, play safe by requesting a reflow. // XXXldb This should only do work for attributes that cause changes! PresContext()->PresShell()-> FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY); return NS_OK; } void nsMathMLContainerFrame::GatherAndStoreOverflow(ReflowOutput* aMetrics) { mBlockStartAscent = aMetrics->BlockStartAscent(); // nsIFrame::FinishAndStoreOverflow likes the overflow area to include the // frame rectangle. aMetrics->SetOverflowAreasToDesiredBounds(); ComputeCustomOverflow(aMetrics->mOverflowAreas); // mBoundingMetrics does not necessarily include content of // elements whose mBoundingMetrics may not be representative of the true // bounds, and doesn't include the CSS2 outline rectangles of children, so // make such to include child overflow areas. UnionChildOverflow(aMetrics->mOverflowAreas); FinishAndStoreOverflow(aMetrics); } bool nsMathMLContainerFrame::ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) { // All non-child-frame content such as nsMathMLChars (and most child-frame // content) is included in mBoundingMetrics. nsRect boundingBox(mBoundingMetrics.leftBearing, mBlockStartAscent - mBoundingMetrics.ascent, mBoundingMetrics.rightBearing - mBoundingMetrics.leftBearing, mBoundingMetrics.ascent + mBoundingMetrics.descent); // REVIEW: Maybe this should contribute only to visual overflow // and not scrollable? aOverflowAreas.UnionAllWith(boundingBox); return nsContainerFrame::ComputeCustomOverflow(aOverflowAreas); } void nsMathMLContainerFrame::ReflowChild(nsIFrame* aChildFrame, nsPresContext* aPresContext, ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) { // Having foreign/hybrid children, e.g., from html markups, is not defined by // the MathML spec. But it can happen in practice, e.g., allows us // to do some cool demos... or we may have a child that is an nsInlineFrame // from a generated content such as :before { content: open-quote } or // :after { content: close-quote }. Unfortunately, the other frames out-there // may expect their own invariants that are not met when we mix things. // Hence we do not claim their support, but we will nevertheless attempt to keep // them in the flow, if we can get their desired size. We observed that most // frames may be reflowed generically, but nsInlineFrames need extra care. #ifdef DEBUG nsInlineFrame* inlineFrame = do_QueryFrame(aChildFrame); NS_ASSERTION(!inlineFrame, "Inline frames should be wrapped in blocks"); #endif nsContainerFrame::ReflowChild(aChildFrame, aPresContext, aDesiredSize, aReflowInput, 0, 0, ReflowChildFlags::NoMoveFrame, aStatus); if (aDesiredSize.BlockStartAscent() == ReflowOutput::ASK_FOR_BASELINE) { // This will be suitable for inline frames, which are wrapped in a block. nscoord ascent; WritingMode wm = aDesiredSize.GetWritingMode(); if (!nsLayoutUtils::GetLastLineBaseline(wm, aChildFrame, &ascent)) { // We don't expect any other block children so just place the frame on // the baseline instead of going through DidReflow() and // GetBaseline(). This is what nsFrame::GetBaseline() will do anyway. aDesiredSize.SetBlockStartAscent(aDesiredSize.BSize(wm)); } else { aDesiredSize.SetBlockStartAscent(ascent); } } if (IsForeignChild(aChildFrame)) { // use ComputeTightBounds API as aDesiredSize.mBoundingMetrics is not set. nsRect r = aChildFrame->ComputeTightBounds(aReflowInput.mRenderingContext->GetDrawTarget()); aDesiredSize.mBoundingMetrics.leftBearing = r.x; aDesiredSize.mBoundingMetrics.rightBearing = r.XMost(); aDesiredSize.mBoundingMetrics.ascent = aDesiredSize.BlockStartAscent() - r.y; aDesiredSize.mBoundingMetrics.descent = r.YMost() - aDesiredSize.BlockStartAscent(); aDesiredSize.mBoundingMetrics.width = aDesiredSize.Width(); } } void nsMathMLContainerFrame::Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) { MarkInReflow(); mPresentationData.flags &= ~NS_MATHML_ERROR; aDesiredSize.Width() = aDesiredSize.Height() = 0; aDesiredSize.SetBlockStartAscent(0); aDesiredSize.mBoundingMetrics = nsBoundingMetrics(); ///////////// // Reflow children // Asking each child to cache its bounding metrics nsReflowStatus childStatus; nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { ReflowOutput childDesiredSize(aReflowInput, // ??? aDesiredSize.mFlags); WritingMode wm = childFrame->GetWritingMode(); LogicalSize availSize = aReflowInput.ComputedSize(wm); availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE; ReflowInput childReflowInput(aPresContext, aReflowInput, childFrame, availSize); ReflowChild(childFrame, aPresContext, childDesiredSize, childReflowInput, childStatus); //NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status"); SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize, childDesiredSize.mBoundingMetrics); childFrame = childFrame->GetNextSibling(); } ///////////// // If we are a container which is entitled to stretch its children, then we // ask our stretchy children to stretch themselves // The stretching of siblings of an embellished child is _deferred_ until // after finishing the stretching of the embellished child - bug 117652 DrawTarget* drawTarget = aReflowInput.mRenderingContext->GetDrawTarget(); if (!NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags) && (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) || NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags))) { // get the stretchy direction nsStretchDirection stretchDir = NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) ? NS_STRETCH_DIRECTION_VERTICAL : NS_STRETCH_DIRECTION_HORIZONTAL; // what size should we use to stretch our stretchy children // We don't use STRETCH_CONSIDER_ACTUAL_SIZE -- because our size is not known yet // We don't use STRETCH_CONSIDER_EMBELLISHMENTS -- because we don't want to // include them in the caculations of the size of stretchy elements nsBoundingMetrics containerSize; GetPreferredStretchSize(drawTarget, 0, stretchDir, containerSize); // fire the stretch on each child childFrame = mFrames.FirstChild(); while (childFrame) { nsIMathMLFrame* mathMLFrame = do_QueryFrame(childFrame); if (mathMLFrame) { // retrieve the metrics that was stored at the previous pass ReflowOutput childDesiredSize(aReflowInput); GetReflowAndBoundingMetricsFor(childFrame, childDesiredSize, childDesiredSize.mBoundingMetrics); mathMLFrame->Stretch(drawTarget, stretchDir, containerSize, childDesiredSize); // store the updated metrics SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize, childDesiredSize.mBoundingMetrics); } childFrame = childFrame->GetNextSibling(); } } ///////////// // Place children now by re-adjusting the origins to align the baselines FinalizeReflow(drawTarget, aDesiredSize); aStatus = NS_FRAME_COMPLETE; NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize); } static nscoord AddInterFrameSpacingToSize(ReflowOutput& aDesiredSize, nsMathMLContainerFrame* aFrame); /* virtual */ void nsMathMLContainerFrame::MarkIntrinsicISizesDirty() { mIntrinsicWidth = NS_INTRINSIC_WIDTH_UNKNOWN; nsContainerFrame::MarkIntrinsicISizesDirty(); } void nsMathMLContainerFrame::UpdateIntrinsicWidth(nsRenderingContext* aRenderingContext) { if (mIntrinsicWidth == NS_INTRINSIC_WIDTH_UNKNOWN) { ReflowOutput desiredSize(GetWritingMode()); GetIntrinsicISizeMetrics(aRenderingContext, desiredSize); // Include the additional width added by FixInterFrameSpacing to ensure // consistent width calculations. AddInterFrameSpacingToSize(desiredSize, this); mIntrinsicWidth = desiredSize.ISize(GetWritingMode()); } } /* virtual */ nscoord nsMathMLContainerFrame::GetMinISize(nsRenderingContext* aRenderingContext) { nscoord result; DISPLAY_MIN_WIDTH(this, result); UpdateIntrinsicWidth(aRenderingContext); result = mIntrinsicWidth; return result; } /* virtual */ nscoord nsMathMLContainerFrame::GetPrefISize(nsRenderingContext* aRenderingContext) { nscoord result; DISPLAY_PREF_WIDTH(this, result); UpdateIntrinsicWidth(aRenderingContext); result = mIntrinsicWidth; return result; } /* virtual */ void nsMathMLContainerFrame::GetIntrinsicISizeMetrics(nsRenderingContext* aRenderingContext, ReflowOutput& aDesiredSize) { // Get child widths nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { ReflowOutput childDesiredSize(GetWritingMode()); // ??? nsMathMLContainerFrame* containerFrame = do_QueryFrame(childFrame); if (containerFrame) { containerFrame->GetIntrinsicISizeMetrics(aRenderingContext, childDesiredSize); } else { // XXX This includes margin while Reflow currently doesn't consider // margin, so we may end up with too much space, but, with stretchy // characters, this is an approximation anyway. nscoord width = nsLayoutUtils::IntrinsicForContainer(aRenderingContext, childFrame, nsLayoutUtils::PREF_ISIZE); childDesiredSize.Width() = width; childDesiredSize.mBoundingMetrics.width = width; childDesiredSize.mBoundingMetrics.leftBearing = 0; childDesiredSize.mBoundingMetrics.rightBearing = width; nscoord x, xMost; if (NS_SUCCEEDED(childFrame->GetPrefWidthTightBounds(aRenderingContext, &x, &xMost))) { childDesiredSize.mBoundingMetrics.leftBearing = x; childDesiredSize.mBoundingMetrics.rightBearing = xMost; } } SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize, childDesiredSize.mBoundingMetrics); childFrame = childFrame->GetNextSibling(); } // Measure nsresult rv = MeasureForWidth(aRenderingContext->GetDrawTarget(), aDesiredSize); if (NS_FAILED(rv)) { ReflowError(aRenderingContext->GetDrawTarget(), aDesiredSize); } ClearSavedChildMetrics(); } /* virtual */ nsresult nsMathMLContainerFrame::MeasureForWidth(DrawTarget* aDrawTarget, ReflowOutput& aDesiredSize) { return Place(aDrawTarget, false, aDesiredSize); } // see spacing table in Chapter 18, TeXBook (p.170) // Our table isn't quite identical to TeX because operators have // built-in values for lspace & rspace in the Operator Dictionary. static int32_t kInterFrameSpacingTable[eMathMLFrameType_COUNT][eMathMLFrameType_COUNT] = { // in units of muspace. // upper half of the byte is set if the // spacing is not to be used for scriptlevel > 0 /* Ord OpOrd OpInv OpUsr Inner Italic Upright */ /*Ord */ {0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0x00}, /*OpOrd*/ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /*OpInv*/ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /*OpUsr*/ {0x01, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01}, /*Inner*/ {0x01, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01}, /*Italic*/ {0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0x01}, /*Upright*/ {0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x00} }; #define GET_INTERSPACE(scriptlevel_, frametype1_, frametype2_, space_) \ /* no space if there is a frame that we know nothing about */ \ if (frametype1_ == eMathMLFrameType_UNKNOWN || \ frametype2_ == eMathMLFrameType_UNKNOWN) \ space_ = 0; \ else { \ space_ = kInterFrameSpacingTable[frametype1_][frametype2_]; \ space_ = (scriptlevel_ > 0 && (space_ & 0xF0)) \ ? 0 /* spacing is disabled */ \ : space_ & 0x0F; \ } \ // This function computes the inter-space between two frames. However, // since invisible operators need special treatment, the inter-space may // be delayed when an invisible operator is encountered. In this case, // the function will carry the inter-space forward until it is determined // that it can be applied properly (i.e., until we encounter a visible // frame where to decide whether to accept or reject the inter-space). // aFromFrameType: remembers the frame when the carry-forward initiated. // aCarrySpace: keeps track of the inter-space that is delayed. // @returns: current inter-space (which is 0 when the true inter-space is // delayed -- and thus has no effect since the frame is invisible anyway). static nscoord GetInterFrameSpacing(int32_t aScriptLevel, eMathMLFrameType aFirstFrameType, eMathMLFrameType aSecondFrameType, eMathMLFrameType* aFromFrameType, // IN/OUT int32_t* aCarrySpace) // IN/OUT { eMathMLFrameType firstType = aFirstFrameType; eMathMLFrameType secondType = aSecondFrameType; int32_t space; GET_INTERSPACE(aScriptLevel, firstType, secondType, space); // feedback control to avoid the inter-space to be added when not necessary if (secondType == eMathMLFrameType_OperatorInvisible) { // see if we should start to carry the space forward until we // encounter a visible frame if (*aFromFrameType == eMathMLFrameType_UNKNOWN) { *aFromFrameType = firstType; *aCarrySpace = space; } // keep carrying *aCarrySpace forward, while returning 0 for this stage space = 0; } else if (*aFromFrameType != eMathMLFrameType_UNKNOWN) { // no carry-forward anymore, get the real inter-space between // the two frames of interest firstType = *aFromFrameType; // But... the invisible operator that we encountered earlier could // be sitting between italic and upright identifiers, e.g., // // 1. sin ⁡ x // 2. x &InvisibileTime; sin // // the trick to get the inter-space in either situation // is to promote "sin⁡" and // "&InvisibileTime;sin" to user-defined operators... if (firstType == eMathMLFrameType_UprightIdentifier) { firstType = eMathMLFrameType_OperatorUserDefined; } else if (secondType == eMathMLFrameType_UprightIdentifier) { secondType = eMathMLFrameType_OperatorUserDefined; } GET_INTERSPACE(aScriptLevel, firstType, secondType, space); // Now, we have two values: the computed space and the space that // has been carried forward until now. Which value do we pick? // If the second type is an operator (e.g., fence), it already has // built-in lspace & rspace, so we let them win. Otherwise we pick // the max between the two values that we have. if (secondType != eMathMLFrameType_OperatorOrdinary && space < *aCarrySpace) space = *aCarrySpace; // reset everything now that the carry-forward is done *aFromFrameType = eMathMLFrameType_UNKNOWN; *aCarrySpace = 0; } return space; } static nscoord GetThinSpace(const nsStyleFont* aStyleFont) { return NSToCoordRound(float(aStyleFont->mFont.size)*float(3) / float(18)); } class nsMathMLContainerFrame::RowChildFrameIterator { public: explicit RowChildFrameIterator(nsMathMLContainerFrame* aParentFrame) : mParentFrame(aParentFrame), mReflowOutput(aParentFrame->GetWritingMode()), mX(0), mCarrySpace(0), mFromFrameType(eMathMLFrameType_UNKNOWN), mRTL(aParentFrame->StyleVisibility()->mDirection) { if (!mRTL) { mChildFrame = aParentFrame->mFrames.FirstChild(); } else { mChildFrame = aParentFrame->mFrames.LastChild(); } if (!mChildFrame) return; InitMetricsForChild(); } RowChildFrameIterator& operator++() { // add child size + italic correction mX += mReflowOutput.mBoundingMetrics.width + mItalicCorrection; if (!mRTL) { mChildFrame = mChildFrame->GetNextSibling(); } else { mChildFrame = mChildFrame->GetPrevSibling(); } if (!mChildFrame) return *this; eMathMLFrameType prevFrameType = mChildFrameType; InitMetricsForChild(); // add inter frame spacing const nsStyleFont* font = mParentFrame->StyleFont(); nscoord space = GetInterFrameSpacing(font->mScriptLevel, prevFrameType, mChildFrameType, &mFromFrameType, &mCarrySpace); mX += space * GetThinSpace(font); return *this; } nsIFrame* Frame() const { return mChildFrame; } nscoord X() const { return mX; } const ReflowOutput& GetReflowOutput() const { return mReflowOutput; } nscoord Ascent() const { return mReflowOutput.BlockStartAscent(); } nscoord Descent() const { return mReflowOutput.Height() - mReflowOutput.BlockStartAscent(); } const nsBoundingMetrics& BoundingMetrics() const { return mReflowOutput.mBoundingMetrics; } private: const nsMathMLContainerFrame* mParentFrame; nsIFrame* mChildFrame; ReflowOutput mReflowOutput; nscoord mX; nscoord mItalicCorrection; eMathMLFrameType mChildFrameType; int32_t mCarrySpace; eMathMLFrameType mFromFrameType; bool mRTL; void InitMetricsForChild() { GetReflowAndBoundingMetricsFor(mChildFrame, mReflowOutput, mReflowOutput.mBoundingMetrics, &mChildFrameType); nscoord leftCorrection, rightCorrection; GetItalicCorrection(mReflowOutput.mBoundingMetrics, leftCorrection, rightCorrection); if (!mChildFrame->GetPrevSibling() && mParentFrame->GetContent()->IsMathMLElement(nsGkAtoms::msqrt_)) { // Remove leading correction in because the sqrt glyph itself is // there first. if (!mRTL) { leftCorrection = 0; } else { rightCorrection = 0; } } // add left correction -- this fixes the problem of the italic 'f' // e.g., q f I mX += leftCorrection; mItalicCorrection = rightCorrection; } }; /* virtual */ nsresult nsMathMLContainerFrame::Place(DrawTarget* aDrawTarget, bool aPlaceOrigin, ReflowOutput& aDesiredSize) { // This is needed in case this frame is empty (i.e., no child frames) mBoundingMetrics = nsBoundingMetrics(); RowChildFrameIterator child(this); nscoord ascent = 0, descent = 0; while (child.Frame()) { if (descent < child.Descent()) descent = child.Descent(); if (ascent < child.Ascent()) ascent = child.Ascent(); // add the child size mBoundingMetrics.width = child.X(); mBoundingMetrics += child.BoundingMetrics(); ++child; } // Add the italic correction at the end (including the last child). // This gives a nice gap between math and non-math frames, and still // gives the same math inter-spacing in case this frame connects to // another math frame mBoundingMetrics.width = child.X(); aDesiredSize.Width() = std::max(0, mBoundingMetrics.width); aDesiredSize.Height() = ascent + descent; aDesiredSize.SetBlockStartAscent(ascent); aDesiredSize.mBoundingMetrics = mBoundingMetrics; mReference.x = 0; mReference.y = aDesiredSize.BlockStartAscent(); ////////////////// // Place Children if (aPlaceOrigin) { PositionRowChildFrames(0, aDesiredSize.BlockStartAscent()); } return NS_OK; } void nsMathMLContainerFrame::PositionRowChildFrames(nscoord aOffsetX, nscoord aBaseline) { RowChildFrameIterator child(this); while (child.Frame()) { nscoord dx = aOffsetX + child.X(); nscoord dy = aBaseline - child.Ascent(); FinishReflowChild(child.Frame(), PresContext(), child.GetReflowOutput(), nullptr, dx, dy, ReflowChildFlags::Default); ++child; } } class ForceReflow : public nsIReflowCallback { public: virtual bool ReflowFinished() override { return true; } virtual void ReflowCallbackCanceled() override {} }; // We only need one of these so we just make it a static global, no need // to dynamically allocate/destroy it. static ForceReflow gForceReflow; void nsMathMLContainerFrame::SetIncrementScriptLevel(int32_t aChildIndex, bool aIncrement) { nsIFrame* child = PrincipalChildList().FrameAt(aChildIndex); if (!child) return; nsIContent* content = child->GetContent(); if (!content->IsMathMLElement()) return; nsMathMLElement* element = static_cast(content); if (element->GetIncrementScriptLevel() == aIncrement) return; // XXXroc this does a ContentStatesChanged, is it safe to call here? If // not we should do it in a post-reflow callback. element->SetIncrementScriptLevel(aIncrement, true); PresContext()->PresShell()->PostReflowCallback(&gForceReflow); } // helpers to fix the inter-spacing when is the only parent // e.g., it fixes f q f I static nscoord GetInterFrameSpacingFor(int32_t aScriptLevel, nsIFrame* aParentFrame, nsIFrame* aChildFrame) { nsIFrame* childFrame = aParentFrame->PrincipalChildList().FirstChild(); if (!childFrame || aChildFrame == childFrame) return 0; int32_t carrySpace = 0; eMathMLFrameType fromFrameType = eMathMLFrameType_UNKNOWN; eMathMLFrameType prevFrameType = eMathMLFrameType_UNKNOWN; eMathMLFrameType childFrameType = nsMathMLFrame::GetMathMLFrameTypeFor(childFrame); childFrame = childFrame->GetNextSibling(); while (childFrame) { prevFrameType = childFrameType; childFrameType = nsMathMLFrame::GetMathMLFrameTypeFor(childFrame); nscoord space = GetInterFrameSpacing(aScriptLevel, prevFrameType, childFrameType, &fromFrameType, &carrySpace); if (aChildFrame == childFrame) { // get thinspace nsStyleContext* parentContext = aParentFrame->StyleContext(); nscoord thinSpace = GetThinSpace(parentContext->StyleFont()); // we are done return space * thinSpace; } childFrame = childFrame->GetNextSibling(); } NS_NOTREACHED("child not in the childlist of its parent"); return 0; } static nscoord AddInterFrameSpacingToSize(ReflowOutput& aDesiredSize, nsMathMLContainerFrame* aFrame) { nscoord gap = 0; nsIFrame* parent = aFrame->GetParent(); nsIContent* parentContent = parent->GetContent(); if (MOZ_UNLIKELY(!parentContent)) { return 0; } if (parentContent->IsAnyOfMathMLElements(nsGkAtoms::math, nsGkAtoms::mtd_)) { gap = GetInterFrameSpacingFor(aFrame->StyleFont()->mScriptLevel, parent, aFrame); // add our own italic correction nscoord leftCorrection = 0, italicCorrection = 0; aFrame->GetItalicCorrection(aDesiredSize.mBoundingMetrics, leftCorrection, italicCorrection); gap += leftCorrection; if (gap) { aDesiredSize.mBoundingMetrics.leftBearing += gap; aDesiredSize.mBoundingMetrics.rightBearing += gap; aDesiredSize.mBoundingMetrics.width += gap; aDesiredSize.Width() += gap; } aDesiredSize.mBoundingMetrics.width += italicCorrection; aDesiredSize.Width() += italicCorrection; } return gap; } nscoord nsMathMLContainerFrame::FixInterFrameSpacing(ReflowOutput& aDesiredSize) { nscoord gap = 0; gap = AddInterFrameSpacingToSize(aDesiredSize, this); if (gap) { // Shift our children to account for the correction nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { childFrame->SetPosition(childFrame->GetPosition() + nsPoint(gap, 0)); childFrame = childFrame->GetNextSibling(); } } return gap; } /* static */ void nsMathMLContainerFrame::DidReflowChildren(nsIFrame* aFirst, nsIFrame* aStop) { if (MOZ_UNLIKELY(!aFirst)) return; for (nsIFrame* frame = aFirst; frame != aStop; frame = frame->GetNextSibling()) { NS_ASSERTION(frame, "aStop isn't a sibling"); if (frame->GetStateBits() & NS_FRAME_IN_REFLOW) { // finish off principal descendants, too nsIFrame* grandchild = frame->PrincipalChildList().FirstChild(); if (grandchild) DidReflowChildren(grandchild, nullptr); frame->DidReflow(frame->PresContext(), nullptr, nsDidReflowStatus::FINISHED); } } } // helper used by mstyle, mphantom, mpadded and mrow in their implementations // of TransmitAutomaticData(). nsresult nsMathMLContainerFrame::TransmitAutomaticDataForMrowLikeElement() { // // One loop to check both conditions below: // // 1) whether all the children of the mrow-like element are space-like. // // The REC defines the following elements to be "space-like": // * an mstyle, mphantom, or mpadded element, all of whose direct // sub-expressions are space-like; // * an mrow all of whose direct sub-expressions are space-like. // // 2) whether all but one child of the mrow-like element are space-like and // this non-space-like child is an embellished operator. // // The REC defines the following elements to be embellished operators: // * one of the elements mstyle, mphantom, or mpadded, such that an mrow // containing the same arguments would be an embellished operator; // * an mrow whose arguments consist (in any order) of one embellished // operator and zero or more space-like elements. // nsIFrame *childFrame, *baseFrame; bool embellishedOpFound = false; nsEmbellishData embellishData; for (childFrame = PrincipalChildList().FirstChild(); childFrame; childFrame = childFrame->GetNextSibling()) { nsIMathMLFrame* mathMLFrame = do_QueryFrame(childFrame); if (!mathMLFrame) break; if (!mathMLFrame->IsSpaceLike()) { if (embellishedOpFound) break; baseFrame = childFrame; GetEmbellishDataFrom(baseFrame, embellishData); if (!NS_MATHML_IS_EMBELLISH_OPERATOR(embellishData.flags)) break; embellishedOpFound = true; } } if (!childFrame) { // we successfully went to the end of the loop. This means that one of // condition 1) or 2) holds. if (!embellishedOpFound) { // the mrow-like element is space-like. mPresentationData.flags |= NS_MATHML_SPACE_LIKE; } else { // the mrow-like element is an embellished operator. // let the state of the embellished operator found bubble to us. mPresentationData.baseFrame = baseFrame; mEmbellishData = embellishData; } } if (childFrame || !embellishedOpFound) { // The element is not embellished operator mPresentationData.baseFrame = nullptr; mEmbellishData.flags = 0; mEmbellishData.coreFrame = nullptr; mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED; mEmbellishData.leadingSpace = 0; mEmbellishData.trailingSpace = 0; } if (childFrame || embellishedOpFound) { // The element is not space-like mPresentationData.flags &= ~NS_MATHML_SPACE_LIKE; } return NS_OK; } /*static*/ void nsMathMLContainerFrame::PropagateFrameFlagFor(nsIFrame* aFrame, nsFrameState aFlags) { if (!aFrame || !aFlags) return; aFrame->AddStateBits(aFlags); for (nsIFrame* childFrame : aFrame->PrincipalChildList()) { PropagateFrameFlagFor(childFrame, aFlags); } } nsresult nsMathMLContainerFrame::ReportErrorToConsole(const char* errorMsgId, const char16_t** aParams, uint32_t aParamCount) { return nsContentUtils::ReportToConsole(nsIScriptError::errorFlag, NS_LITERAL_CSTRING("Layout: MathML"), mContent->OwnerDoc(), nsContentUtils::eMATHML_PROPERTIES, errorMsgId, aParams, aParamCount); } nsresult nsMathMLContainerFrame::ReportParseError(const char16_t* aAttribute, const char16_t* aValue) { const char16_t* argv[] = { aValue, aAttribute, mContent->NodeInfo()->NameAtom()->GetUTF16String() }; return ReportErrorToConsole("AttributeParsingError", argv, 3); } nsresult nsMathMLContainerFrame::ReportChildCountError() { const char16_t* arg = mContent->NodeInfo()->NameAtom()->GetUTF16String(); return ReportErrorToConsole("ChildCountIncorrect", &arg, 1); } nsresult nsMathMLContainerFrame::ReportInvalidChildError(nsIAtom* aChildTag) { const char16_t* argv[] = { aChildTag->GetUTF16String(), mContent->NodeInfo()->NameAtom()->GetUTF16String() }; return ReportErrorToConsole("InvalidChild", argv, 2); } //========================== nsContainerFrame* NS_NewMathMLmathBlockFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) { return new (aPresShell) nsMathMLmathBlockFrame(aContext); } NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmathBlockFrame) NS_QUERYFRAME_HEAD(nsMathMLmathBlockFrame) NS_QUERYFRAME_ENTRY(nsMathMLmathBlockFrame) NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame) nsContainerFrame* NS_NewMathMLmathInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) { return new (aPresShell) nsMathMLmathInlineFrame(aContext); } NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmathInlineFrame) NS_QUERYFRAME_HEAD(nsMathMLmathInlineFrame) NS_QUERYFRAME_ENTRY(nsIMathMLFrame) NS_QUERYFRAME_TAIL_INHERITING(nsInlineFrame)