/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla MathML Project. * * The Initial Developer of the Original Code is * The University Of Queensland. * Portions created by the Initial Developer are Copyright (C) 1999 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Roger B. Sidje * David J. Fiddes * Pierre Phaneuf * Karl Tomlinson , Mozilla Corporation * * Alternatively, the contents of this file may be used under the terms of * either of the GNU General Public License Version 2 or later (the "GPL"), * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #include "nsCOMPtr.h" #include "nsHTMLParts.h" #include "nsFrame.h" #include "nsPresContext.h" #include "nsIPresShell.h" #include "nsCSSAnonBoxes.h" #include "nsStyleContext.h" #include "nsStyleConsts.h" #include "nsINameSpaceManager.h" #include "nsIRenderingContext.h" #include "nsIFontMetrics.h" #include "nsIDOMText.h" #include "nsIDOMMutationEvent.h" #include "nsFrameManager.h" #include "nsStyleChangeList.h" #include "nsGkAtoms.h" #include "nsMathMLParts.h" #include "nsMathMLContainerFrame.h" #include "nsAutoPtr.h" #include "nsStyleSet.h" #include "nsDisplayList.h" #include "nsCSSFrameConstructor.h" #include "nsIReflowCallback.h" using namespace mozilla; // // nsMathMLContainerFrame implementation // NS_IMPL_FRAMEARENA_HELPERS(nsMathMLContainerFrame) NS_QUERYFRAME_HEAD(nsMathMLContainerFrame) NS_QUERYFRAME_ENTRY(nsMathMLFrame) NS_QUERYFRAME_TAIL_INHERITING(nsHTMLContainerFrame) // ============================================================================= // error handlers // provide a feedback to the user when a frame with bad markup can not be rendered nsresult nsMathMLContainerFrame::ReflowError(nsIRenderingContext& aRenderingContext, nsHTMLReflowMetrics& aDesiredSize) { nsresult rv; // clear all other flags and record that there is an error with this frame mEmbellishData.flags = 0; mPresentationData.flags = NS_MATHML_ERROR; /////////////// // Set font nsLayoutUtils::SetFontFromStyle(&aRenderingContext, GetStyleContext()); // bounding metrics nsAutoString errorMsg; errorMsg.AssignLiteral("invalid-markup"); rv = aRenderingContext.GetBoundingMetrics(errorMsg.get(), PRUint32(errorMsg.Length()), mBoundingMetrics); if (NS_FAILED(rv)) { NS_WARNING("GetBoundingMetrics failed"); aDesiredSize.width = aDesiredSize.height = 0; aDesiredSize.ascent = 0; return NS_OK; } // reflow metrics nsCOMPtr fm; aRenderingContext.GetFontMetrics(*getter_AddRefs(fm)); fm->GetMaxAscent(aDesiredSize.ascent); nscoord descent; fm->GetMaxDescent(descent); aDesiredSize.height = aDesiredSize.ascent + descent; aDesiredSize.width = mBoundingMetrics.width; // Also return our bounding metrics aDesiredSize.mBoundingMetrics = mBoundingMetrics; return NS_OK; } class nsDisplayMathMLError : public nsDisplayItem { public: nsDisplayMathMLError(nsIFrame* aFrame) : nsDisplayItem(aFrame) { MOZ_COUNT_CTOR(nsDisplayMathMLError); } #ifdef NS_BUILD_REFCNT_LOGGING virtual ~nsDisplayMathMLError() { MOZ_COUNT_DTOR(nsDisplayMathMLError); } #endif virtual void Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx); NS_DISPLAY_DECL_NAME("MathMLError", TYPE_MATHML_ERROR) }; void nsDisplayMathMLError::Paint(nsDisplayListBuilder* aBuilder, nsIRenderingContext* aCtx) { // Set color and font ... nsLayoutUtils::SetFontFromStyle(aCtx, mFrame->GetStyleContext()); nsPoint pt = aBuilder->ToReferenceFrame(mFrame); aCtx->SetColor(NS_RGB(255,0,0)); aCtx->FillRect(nsRect(pt, mFrame->GetSize())); aCtx->SetColor(NS_RGB(255,255,255)); nscoord ascent; nsCOMPtr fm; aCtx->GetFontMetrics(*getter_AddRefs(fm)); fm->GetMaxAscent(ascent); nsAutoString errorMsg; errorMsg.AssignLiteral("invalid-markup"); aCtx->DrawString(errorMsg.get(), PRUint32(errorMsg.Length()), pt.x, pt.y+ascent); } /* ///////////// * nsIMathMLFrame - support methods for stretchy elements * ============================================================================= */ static PRBool 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; } static void DestroyHTMLReflowMetrics(void *aPropertyValue) { delete static_cast(aPropertyValue); } NS_DECLARE_FRAME_PROPERTY(HTMLReflowMetricsProperty, DestroyHTMLReflowMetrics) /* static */ void nsMathMLContainerFrame::SaveReflowAndBoundingMetricsFor(nsIFrame* aFrame, const nsHTMLReflowMetrics& aReflowMetrics, const nsBoundingMetrics& aBoundingMetrics) { nsHTMLReflowMetrics *metrics = new nsHTMLReflowMetrics(aReflowMetrics); metrics->mBoundingMetrics = aBoundingMetrics; aFrame->Properties().Set(HTMLReflowMetricsProperty(), metrics); } // helper method to facilitate getting the reflow and bounding metrics /* static */ void nsMathMLContainerFrame::GetReflowAndBoundingMetricsFor(nsIFrame* aFrame, nsHTMLReflowMetrics& aReflowMetrics, nsBoundingMetrics& aBoundingMetrics, eMathMLFrameType* aMathMLFrameType) { NS_PRECONDITION(aFrame, "null arg"); nsHTMLReflowMetrics *metrics = static_cast (aFrame->Properties().Get(HTMLReflowMetricsProperty())); // IMPORTANT: This function is only meant to be called in Place() methods // where it is assumed that SaveReflowAndBoundingMetricsFor has recorded the // information. NS_ASSERTION(metrics, "Didn't SaveReflowAndBoundingMetricsFor frame!"); if (metrics) { aReflowMetrics = *metrics; aBoundingMetrics = metrics->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(); FramePropertyTable* props = PresContext()->PropertyTable(); while (childFrame) { props->Delete(childFrame, HTMLReflowMetricsProperty()); 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(nsIRenderingContext& aRenderingContext, PRUint32 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() nsHTMLReflowMetrics metrics; Place(aRenderingContext, PR_FALSE, metrics); aPreferredStretchSize = metrics.mBoundingMetrics; } else { // compute a size that doesn't include embellishements NS_ASSERTION(NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags) || NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags) || NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags), "invalid call to GetPreferredStretchSize"); PRBool firstTime = PR_TRUE; nsBoundingMetrics bm, bmChild; // XXXrbs need overloaded FirstChild() and clean integration of throughout nsIFrame* childFrame = GetFirstChild(nsnull); 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 { nsHTMLReflowMetrics unused; GetReflowAndBoundingMetricsFor(childFrame, unused, bmChild); } if (firstTime) { firstTime = PR_FALSE; bm = bmChild; if (!NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags) && !NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags)) { // we may get here for cases such as ... ... break; } } else { if (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags)) { // 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 (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags)) { // 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(nsIRenderingContext& aRenderingContext, nsStretchDirection aStretchDirection, nsBoundingMetrics& aContainerSize, nsHTMLReflowMetrics& 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) { PRBool stretchAll = NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) || NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags); // And the trick is that the child's rect.x is still holding the descent, // and rect.y is still holding the ascent ... nsHTMLReflowMetrics 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 != NS_STRETCH_DIRECTION_DEFAULT && aStretchDirection != mEmbellishData.direction) { if (mEmbellishData.direction == NS_STRETCH_DIRECTION_UNSUPPORTED) { containerSize = childSize.mBoundingMetrics; } else { GetPreferredStretchSize(aRenderingContext, stretchAll ? STRETCH_CONSIDER_EMBELLISHMENTS : 0, mEmbellishData.direction, containerSize); } } // do the stretching... mathMLFrame->Stretch(aRenderingContext, mEmbellishData.direction, 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 (stretchAll) { nsStretchDirection stretchDir = NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) ? NS_STRETCH_DIRECTION_VERTICAL : NS_STRETCH_DIRECTION_HORIZONTAL; GetPreferredStretchSize(aRenderingContext, 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(aRenderingContext, stretchDir, containerSize, childSize); // store the updated metrics SaveReflowAndBoundingMetricsFor(childFrame, childSize, childSize.mBoundingMetrics); } } childFrame = childFrame->GetNextSibling(); } } // re-position all our children nsresult rv = Place(aRenderingContext, PR_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(mParent, 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.leftSpace + coreData.rightSpace; aDesiredStretchSize.width = mBoundingMetrics.width; aDesiredStretchSize.mBoundingMetrics.width = mBoundingMetrics.width; nscoord dx = coreData.leftSpace; 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(nsIRenderingContext& aRenderingContext, nsHTMLReflowMetrics& 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) PRBool placeOrigin = !NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags) || (mEmbellishData.coreFrame != this && !mPresentationData.baseFrame && mEmbellishData.direction == NS_STRETCH_DIRECTION_UNSUPPORTED); nsresult rv = Place(aRenderingContext, 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)) { DidReflowChildren(GetFirstChild(nsnull)); return rv; } PRBool parentWillFireStretch = PR_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(mParent); 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 = PR_TRUE; } } if (!parentWillFireStretch) { // There is nobody who will fire the stretch for us, we do it ourselves! PRBool stretchAll = /* NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) || */ NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags); nsBoundingMetrics defaultSize; if (mEmbellishData.coreFrame == this /* case of a bare ... itself */ || stretchAll) { /* or ......, or friends */ // use our current size as computed earlier by Place() defaultSize = aDesiredSize.mBoundingMetrics; } else { /* case of ...... or friends */ // compute a size that doesn't include embellishments GetPreferredStretchSize(aRenderingContext, 0, mEmbellishData.direction, defaultSize); } Stretch(aRenderingContext, NS_STRETCH_DIRECTION_DEFAULT, defaultSize, aDesiredSize); #ifdef NS_DEBUG { // The Place() call above didn't request FinishReflowChild(), // so let's check that we eventually did through Stretch(). nsIFrame* childFrame = GetFirstChild(nsnull); for ( ; childFrame; childFrame = childFrame->GetNextSibling()) { NS_ASSERTION(!(childFrame->GetStateBits() & NS_FRAME_IN_REFLOW), "DidReflow() was never called"); } } #endif } } // see if we should fix the spacing FixInterFrameSpacing(aDesiredSize); // Also return our bounding metrics aDesiredSize.mBoundingMetrics = mBoundingMetrics; 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, PRUint32 aFlagsValues, PRUint32 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 nsIFrame* childFrame = aFrame->GetFirstChild(nsnull); while (childFrame) { PropagatePresentationDataFor(childFrame, aFlagsValues, aFlagsToUpdate); childFrame = childFrame->GetNextSibling(); } } } /* static */ void nsMathMLContainerFrame::PropagatePresentationDataFromChildAt(nsIFrame* aParentFrame, PRInt32 aFirstChildIndex, PRInt32 aLastChildIndex, PRUint32 aFlagsValues, PRUint32 aFlagsToUpdate) { if (!aParentFrame || !aFlagsToUpdate) return; PRInt32 index = 0; nsIFrame* childFrame = aParentFrame->GetFirstChild(nsnull); while (childFrame) { if ((index >= aFirstChildIndex) && ((aLastChildIndex <= 0) || ((aLastChildIndex > 0) && (index <= aLastChildIndex)))) { PropagatePresentationDataFor(childFrame, aFlagsValues, aFlagsToUpdate); } index++; childFrame = childFrame->GetNextSibling(); } } /* ////////////////// * Frame construction * ============================================================================= */ NS_IMETHODIMP nsMathMLContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect, 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 NS_OK; return aLists.Content()->AppendNewToTop(new (aBuilder) nsDisplayMathMLError(this)); } nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists); NS_ENSURE_SUCCESS(rv, rv); rv = DisplayTextDecorationsAndChildren(aBuilder, aDirtyRect, aLists); NS_ENSURE_SUCCESS(rv, rv); #if defined(NS_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 rv = DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics, aLists); #endif return rv; } // 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 nsIFrame* childFrame = aParentFrame->GetFirstChild(nsnull); while (childFrame) { nsIMathMLFrame* childMathMLFrame = do_QueryFrame(childFrame); if (childMathMLFrame) { childMathMLFrame->InheritAutomaticData(aParentFrame); } RebuildAutomaticDataForChildren(childFrame); childFrame = childFrame->GetNextSibling(); } 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; // XXXldb This should check namespaces too. if (content->Tag() == nsGkAtoms::math) break; // mark the frame dirty, and continue to climb up. It's important that // we're NOT doing this to the frame we plan to pass to FrameNeedsReflow() // XXXldb Why do we need to bother with this? Marking ancestor // dirty (which we do below) should do a superset of the work this // does. frame->AddStateBits(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN); 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(PRInt32 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 = mParent; nsEmbellishData embellishData; for ( ; parent; frame = parent, parent = parent->GetParent()) { GetEmbellishDataFrom(parent, embellishData); if (embellishData.coreFrame != mEmbellishData.coreFrame) break; // Important: do not do this to the frame we plan to pass to // ReLayoutChildren // XXXldb Why do we need to bother with this? Marking ancestor // dirty (which we do below) should do a superset of the work this // does. frame->AddStateBits(NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN); } } return ReLayoutChildren(frame); } NS_IMETHODIMP nsMathMLContainerFrame::AppendFrames(nsIAtom* aListName, nsFrameList& aFrameList) { if (aListName) { return NS_ERROR_INVALID_ARG; } mFrames.AppendFrames(this, aFrameList); return ChildListChanged(nsIDOMMutationEvent::ADDITION); } NS_IMETHODIMP nsMathMLContainerFrame::InsertFrames(nsIAtom* aListName, nsIFrame* aPrevFrame, nsFrameList& aFrameList) { if (aListName) { return NS_ERROR_INVALID_ARG; } // Insert frames after aPrevFrame mFrames.InsertFrames(this, aPrevFrame, aFrameList); return ChildListChanged(nsIDOMMutationEvent::ADDITION); } NS_IMETHODIMP nsMathMLContainerFrame::RemoveFrame(nsIAtom* aListName, nsIFrame* aOldFrame) { if (aListName) { return NS_ERROR_INVALID_ARG; } // remove the child frame mFrames.DestroyFrame(aOldFrame); return ChildListChanged(nsIDOMMutationEvent::REMOVAL); } NS_IMETHODIMP nsMathMLContainerFrame::AttributeChanged(PRInt32 aNameSpaceID, nsIAtom* aAttribute, PRInt32 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(nsHTMLReflowMetrics* aMetrics) { // nsIFrame::FinishAndStoreOverflow likes the overflow area to include the // frame rectangle. nsRect frameRect(0, 0, aMetrics->width, aMetrics->height); // Text-shadow overflows. if (PresContext()->CompatibilityMode() != eCompatibility_NavQuirks) { nsRect shadowRect = nsLayoutUtils::GetTextShadowRectsUnion(frameRect, this); frameRect.UnionRect(frameRect, shadowRect); } // All non-child-frame content such as nsMathMLChars (and most child-frame // content) is included in mBoundingMetrics. nsRect boundingBox(mBoundingMetrics.leftBearing, aMetrics->ascent - mBoundingMetrics.ascent, mBoundingMetrics.rightBearing - mBoundingMetrics.leftBearing, mBoundingMetrics.ascent + mBoundingMetrics.descent); aMetrics->mOverflowArea.UnionRect(frameRect, boundingBox); // 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. nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { ConsiderChildOverflow(aMetrics->mOverflowArea, childFrame); childFrame = childFrame->GetNextSibling(); } FinishAndStoreOverflow(aMetrics); } nsresult nsMathMLContainerFrame::ReflowChild(nsIFrame* aChildFrame, nsPresContext* aPresContext, nsHTMLReflowMetrics& aDesiredSize, const nsHTMLReflowState& aReflowState, 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 nsresult rv = nsHTMLContainerFrame:: ReflowChild(aChildFrame, aPresContext, aDesiredSize, aReflowState, 0, 0, NS_FRAME_NO_MOVE_FRAME, aStatus); if (NS_FAILED(rv)) return rv; if (aDesiredSize.ascent == nsHTMLReflowMetrics::ASK_FOR_BASELINE) { // This will be suitable for inline frames, which are wrapped in a block. if(!nsLayoutUtils::GetLastLineBaseline(aChildFrame, &aDesiredSize.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.ascent = aDesiredSize.height; } } if (IsForeignChild(aChildFrame)) { // use ComputeTightBounds API as aDesiredSize.mBoundingMetrics is not set. nsRect r = aChildFrame->ComputeTightBounds(aReflowState.rendContext->ThebesContext()); aDesiredSize.mBoundingMetrics.leftBearing = r.x; aDesiredSize.mBoundingMetrics.rightBearing = r.XMost(); aDesiredSize.mBoundingMetrics.ascent = aDesiredSize.ascent - r.y; aDesiredSize.mBoundingMetrics.descent = r.YMost() - aDesiredSize.ascent; aDesiredSize.mBoundingMetrics.width = aDesiredSize.width; } return rv; } NS_IMETHODIMP nsMathMLContainerFrame::Reflow(nsPresContext* aPresContext, nsHTMLReflowMetrics& aDesiredSize, const nsHTMLReflowState& aReflowState, nsReflowStatus& aStatus) { aDesiredSize.width = aDesiredSize.height = 0; aDesiredSize.ascent = 0; aDesiredSize.mBoundingMetrics.Clear(); ///////////// // Reflow children // Asking each child to cache its bounding metrics nsReflowStatus childStatus; nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE); nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags); nsHTMLReflowState childReflowState(aPresContext, aReflowState, childFrame, availSize); nsresult rv = ReflowChild(childFrame, aPresContext, childDesiredSize, childReflowState, childStatus); //NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status"); if (NS_FAILED(rv)) { // Call DidReflow() for the child frames we successfully did reflow. DidReflowChildren(mFrames.FirstChild(), childFrame); return rv; } 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 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(*aReflowState.rendContext, 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 nsHTMLReflowMetrics childDesiredSize; GetReflowAndBoundingMetricsFor(childFrame, childDesiredSize, childDesiredSize.mBoundingMetrics); mathMLFrame->Stretch(*aReflowState.rendContext, 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(*aReflowState.rendContext, aDesiredSize); aStatus = NS_FRAME_COMPLETE; NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize); return NS_OK; } /* virtual */ nscoord nsMathMLContainerFrame::GetMinWidth(nsIRenderingContext *aRenderingContext) { nscoord result; DISPLAY_MIN_WIDTH(this, result); result = GetIntrinsicWidth(aRenderingContext); return result; } /* virtual */ nscoord nsMathMLContainerFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext) { nscoord result; DISPLAY_MIN_WIDTH(this, result); result = GetIntrinsicWidth(aRenderingContext); return result; } /* virtual */ nscoord nsMathMLContainerFrame::GetIntrinsicWidth(nsIRenderingContext* aRenderingContext) { // Get child widths nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { // 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_WIDTH); nsHTMLReflowMetrics childDesiredSize; childDesiredSize.width = width; childDesiredSize.mBoundingMetrics.width = width; // TODO: we need nsIFrame::GetIntrinsicHBounds() for better values here. childDesiredSize.mBoundingMetrics.leftBearing = 0; childDesiredSize.mBoundingMetrics.rightBearing = width; SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize, childDesiredSize.mBoundingMetrics); childFrame = childFrame->GetNextSibling(); } // Measure nsHTMLReflowMetrics desiredSize; nsresult rv = MeasureForWidth(*aRenderingContext, desiredSize); if (NS_FAILED(rv)) { ReflowError(*aRenderingContext, desiredSize); } ClearSavedChildMetrics(); return desiredSize.width; } /* virtual */ nsresult nsMathMLContainerFrame::MeasureForWidth(nsIRenderingContext& aRenderingContext, nsHTMLReflowMetrics& aDesiredSize) { return Place(aRenderingContext, PR_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 PRInt32 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, 0x01} }; #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(PRInt32 aScriptLevel, eMathMLFrameType aFirstFrameType, eMathMLFrameType aSecondFrameType, eMathMLFrameType* aFromFrameType, // IN/OUT PRInt32* aCarrySpace) // IN/OUT { eMathMLFrameType firstType = aFirstFrameType; eMathMLFrameType secondType = aSecondFrameType; PRInt32 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), mChildFrame(aParentFrame->mFrames.FirstChild()), mX(0), mCarrySpace(0), mFromFrameType(eMathMLFrameType_UNKNOWN) { if (!mChildFrame) return; InitMetricsForChild(); // Remove left correction in because the sqrt glyph itself is // there first. if (mParentFrame->GetContent()->Tag() == nsGkAtoms::msqrt_) { mX = 0; } } RowChildFrameIterator& operator++() { // add child size + italic correction mX += mSize.mBoundingMetrics.width + mItalicCorrection; mChildFrame = mChildFrame->GetNextSibling(); if (!mChildFrame) return *this; eMathMLFrameType prevFrameType = mChildFrameType; InitMetricsForChild(); // add inter frame spacing const nsStyleFont* font = mParentFrame->GetStyleFont(); 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 nsHTMLReflowMetrics& ReflowMetrics() const { return mSize; } nscoord Ascent() const { return mSize.ascent; } nscoord Descent() const { return mSize.height - mSize.ascent; } const nsBoundingMetrics& BoundingMetrics() const { return mSize.mBoundingMetrics; } private: const nsMathMLContainerFrame* mParentFrame; nsIFrame* mChildFrame; nsHTMLReflowMetrics mSize; nscoord mX; nscoord mItalicCorrection; eMathMLFrameType mChildFrameType; PRInt32 mCarrySpace; eMathMLFrameType mFromFrameType; void InitMetricsForChild() { GetReflowAndBoundingMetricsFor(mChildFrame, mSize, mSize.mBoundingMetrics, &mChildFrameType); nscoord leftCorrection; GetItalicCorrection(mSize.mBoundingMetrics, leftCorrection, mItalicCorrection); // add left correction -- this fixes the problem of the italic 'f' // e.g., q f I mX += leftCorrection; } }; /* virtual */ nsresult nsMathMLContainerFrame::Place(nsIRenderingContext& aRenderingContext, PRBool aPlaceOrigin, nsHTMLReflowMetrics& aDesiredSize) { // This is needed in case this frame is empty (i.e., no child frames) mBoundingMetrics.Clear(); 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 = mBoundingMetrics.width; aDesiredSize.height = ascent + descent; aDesiredSize.ascent = ascent; aDesiredSize.mBoundingMetrics = mBoundingMetrics; mReference.x = 0; mReference.y = aDesiredSize.ascent; ////////////////// // Place Children if (aPlaceOrigin) { PositionRowChildFrames(0, aDesiredSize.ascent); } 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(), nsnull, child.ReflowMetrics(), dx, dy, 0); ++child; } } class ForceReflow : public nsIReflowCallback { public: virtual PRBool ReflowFinished() { return PR_TRUE; } virtual void ReflowCallbackCanceled() {} }; // 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(PRInt32 aChildIndex, PRBool aIncrement) { nsIFrame* child = GetChildList(nsnull).FrameAt(aChildIndex); if (!child) return; nsIContent* content = child->GetContent(); if (!content->IsMathML()) 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, PR_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(PRInt32 aScriptLevel, nsIFrame* aParentFrame, nsIFrame* aChildFrame) { nsIFrame* childFrame = aParentFrame->GetFirstChild(nsnull); if (!childFrame || aChildFrame == childFrame) return 0; PRInt32 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->GetStyleContext(); nscoord thinSpace = GetThinSpace(parentContext->GetStyleFont()); // we are done return space * thinSpace; } childFrame = childFrame->GetNextSibling(); } NS_NOTREACHED("child not in the childlist of its parent"); return 0; } nscoord nsMathMLContainerFrame::FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize) { nscoord gap = 0; nsIContent* parentContent = mParent->GetContent(); if (NS_UNLIKELY(!parentContent)) { return 0; } // XXXldb This should check namespaces too. nsIAtom *parentTag = parentContent->Tag(); if (parentTag == nsGkAtoms::math || parentTag == nsGkAtoms::mtd_) { gap = GetInterFrameSpacingFor(GetStyleFont()->mScriptLevel, mParent, this); // add our own italic correction nscoord leftCorrection = 0, italicCorrection = 0; GetItalicCorrection(mBoundingMetrics, leftCorrection, italicCorrection); gap += leftCorrection; // see if we should shift our children to account for the correction if (gap) { nsIFrame* childFrame = mFrames.FirstChild(); while (childFrame) { childFrame->SetPosition(childFrame->GetPosition() + nsPoint(gap, 0)); childFrame = childFrame->GetNextSibling(); } mBoundingMetrics.leftBearing += gap; mBoundingMetrics.rightBearing += gap; mBoundingMetrics.width += gap; aDesiredSize.width += gap; } mBoundingMetrics.width += italicCorrection; aDesiredSize.width += italicCorrection; } return gap; } /* static */ void nsMathMLContainerFrame::DidReflowChildren(nsIFrame* aFirst, nsIFrame* aStop) { if (NS_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->GetFirstChild(nsnull); if (grandchild) DidReflowChildren(grandchild, nsnull); frame->DidReflow(frame->PresContext(), nsnull, NS_FRAME_REFLOW_FINISHED); } } } //========================== nsIFrame* NS_NewMathMLmathBlockFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRUint32 aFlags) { nsMathMLmathBlockFrame* it = new (aPresShell) nsMathMLmathBlockFrame(aContext); if (it) { it->SetFlags(aFlags); } return it; } NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmathBlockFrame) nsIFrame* NS_NewMathMLmathInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) { return new (aPresShell) nsMathMLmathInlineFrame(aContext); } NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmathInlineFrame)