/* -*- 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 * Shyjan Mahamud * Pierre Phaneuf * Frederic Wang * * 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 "nsFrame.h" #include "nsPresContext.h" #include "nsStyleContext.h" #include "nsStyleConsts.h" #include "nsIRenderingContext.h" #include "nsIFontMetrics.h" #include "nsContentUtils.h" #include "nsIDOMText.h" #include "nsMathMLmoFrame.h" // // -- operator, fence, or separator - implementation // // additional style context to be used by our MathMLChar. #define NS_MATHML_CHAR_STYLE_CONTEXT_INDEX 0 nsIFrame* NS_NewMathMLmoFrame(nsIPresShell* aPresShell, nsStyleContext *aContext) { return new (aPresShell) nsMathMLmoFrame(aContext); } NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmoFrame) nsMathMLmoFrame::~nsMathMLmoFrame() { } static const PRUnichar kInvisibleComma = PRUnichar(0x200B); // a.k.a. ZERO WIDTH SPACE static const PRUnichar kApplyFunction = PRUnichar(0x2061); static const PRUnichar kInvisibleTimes = PRUnichar(0x2062); static const PRUnichar kNullCh = PRUnichar('\0'); eMathMLFrameType nsMathMLmoFrame::GetMathMLFrameType() { return NS_MATHML_OPERATOR_IS_INVISIBLE(mFlags) ? eMathMLFrameType_OperatorInvisible : eMathMLFrameType_OperatorOrdinary; } // since a mouse click implies selection, we cannot just rely on the // frame's state bit in our child text frame. So we will first check // its selected state bit, and use this little helper to double check. PRBool nsMathMLmoFrame::IsFrameInSelection(nsIFrame* aFrame) { NS_ASSERTION(aFrame, "null arg"); if (!aFrame) return PR_FALSE; PRBool isSelected = PR_FALSE; aFrame->GetSelected(&isSelected); if (!isSelected) return PR_FALSE; const nsFrameSelection* frameSelection = aFrame->GetConstFrameSelection(); SelectionDetails* details = frameSelection->LookUpSelection(aFrame->GetContent(), 0, 1, PR_TRUE); if (!details) return PR_FALSE; while (details) { SelectionDetails* next = details->mNext; delete details; details = next; } return PR_TRUE; } PRBool nsMathMLmoFrame::UseMathMLChar() { return (NS_MATHML_OPERATOR_GET_FORM(mFlags) && NS_MATHML_OPERATOR_IS_MUTABLE(mFlags)) || NS_MATHML_OPERATOR_IS_CENTERED(mFlags) || NS_MATHML_OPERATOR_IS_INVISIBLE(mFlags); } NS_IMETHODIMP nsMathMLmoFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect, const nsDisplayListSet& aLists) { nsresult rv = NS_OK; PRBool useMathMLChar = UseMathMLChar(); if (!useMathMLChar) { // let the base class do everything rv = nsMathMLTokenFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists); NS_ENSURE_SUCCESS(rv, rv); } else { rv = DisplayBorderBackgroundOutline(aBuilder, aLists); NS_ENSURE_SUCCESS(rv, rv); // make our char selected if our inner child text frame is selected PRBool isSelected = PR_FALSE; nsRect selectedRect; nsIFrame* firstChild = mFrames.FirstChild(); if (IsFrameInSelection(firstChild)) { selectedRect = firstChild->GetRect(); isSelected = PR_TRUE; } rv = mMathMLChar.Display(aBuilder, this, aLists, isSelected ? &selectedRect : nsnull); NS_ENSURE_SUCCESS(rv, rv); #if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX) // for visual debug rv = DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics, aLists); #endif } return rv; } // get the text that we enclose and setup our nsMathMLChar void nsMathMLmoFrame::ProcessTextData() { mFlags = 0; nsAutoString data; nsContentUtils::GetNodeTextContent(mContent, PR_FALSE, data); PRInt32 length = data.Length(); PRUnichar ch = (length == 0) ? kNullCh : data[0]; if ((length == 1) && (ch == kInvisibleComma || ch == kApplyFunction || ch == kInvisibleTimes)) { mFlags |= NS_MATHML_OPERATOR_INVISIBLE; } // don't bother doing anything special if we don't have a // single child with a visible text content nsPresContext* presContext = PresContext(); if (NS_MATHML_OPERATOR_IS_INVISIBLE(mFlags) || mFrames.GetLength() != 1) { data.Truncate(); // empty data to reset the char mMathMLChar.SetData(presContext, data); ResolveMathMLCharStyle(presContext, mContent, mStyleContext, &mMathMLChar, PR_FALSE); return; } // special... in math mode, the usual minus sign '-' looks too short, so // what we do here is to remap - to the official Unicode minus // sign (U+2212) which looks much better. For background on this, see // http://groups.google.com/groups?hl=en&th=66488daf1ade7635&rnum=1 if (1 == length && ch == '-') { ch = 0x2212; data = ch; } // cache the special bits: mutable, accent, movablelimits, centered. // we need to do this in anticipation of other requirements, and these // bits don't change. Do not reset these bits unless the text gets changed. // lookup all the forms under which the operator is listed in the dictionary, // and record whether the operator has accent="true" or movablelimits="true" nsOperatorFlags flags[4]; float lspace[4], rspace[4]; nsMathMLOperators::LookupOperators(data, flags, lspace, rspace); nsOperatorFlags allFlags = flags[NS_MATHML_OPERATOR_FORM_INFIX] | flags[NS_MATHML_OPERATOR_FORM_POSTFIX] | flags[NS_MATHML_OPERATOR_FORM_PREFIX]; mFlags |= allFlags & NS_MATHML_OPERATOR_ACCENT; mFlags |= allFlags & NS_MATHML_OPERATOR_MOVABLELIMITS; PRBool isMutable = NS_MATHML_OPERATOR_IS_STRETCHY(allFlags) || NS_MATHML_OPERATOR_IS_LARGEOP(allFlags); if (isMutable) mFlags |= NS_MATHML_OPERATOR_MUTABLE; // see if this is an operator that should be centered to cater for // fonts that are not math-aware if (1 == length) { if ((ch == '+') || (ch == '=') || (ch == '*') || (ch == 0x2212) || // − (ch == 0x2264) || // ≤ (ch == 0x2265) || // ≥ (ch == 0x00D7)) { // × mFlags |= NS_MATHML_OPERATOR_CENTERED; } } // cache the operator mMathMLChar.SetData(presContext, data); ResolveMathMLCharStyle(presContext, mContent, mStyleContext, &mMathMLChar, isMutable); // cache the native direction -- beware of bug 133429... // mEmbellishData.direction must always retain our native direction, whereas // mMathMLChar.GetStretchDirection() may change later, when Stretch() is called mEmbellishData.direction = mMathMLChar.GetStretchDirection(); } // get our 'form' and lookup in the Operator Dictionary to fetch // our default data that may come from there. Then complete our setup // using attributes that we may have. To stay in sync, this function is // called very often. We depend on many things that may change around us. // However, we re-use unchanged values. void nsMathMLmoFrame::ProcessOperatorData() { // if we have been here before, we will just use our cached form nsOperatorFlags form = NS_MATHML_OPERATOR_GET_FORM(mFlags); nsAutoString value; // special bits are always kept in mFlags. // remember the mutable bit from ProcessTextData(). // Some chars are listed under different forms in the dictionary, // and there could be a form under which the char is mutable. // If the char is the core of an embellished container, we will keep // it mutable irrespective of the form of the embellished container. // Also remember the other special bits that we want to carry forward. mFlags &= NS_MATHML_OPERATOR_MUTABLE | NS_MATHML_OPERATOR_ACCENT | NS_MATHML_OPERATOR_MOVABLELIMITS | NS_MATHML_OPERATOR_CENTERED | NS_MATHML_OPERATOR_INVISIBLE; if (!mEmbellishData.coreFrame) { // i.e., we haven't been here before, the default form is infix form = NS_MATHML_OPERATOR_FORM_INFIX; // reset everything so that we don't keep outdated values around // in case of dynamic changes mEmbellishData.flags = 0; mEmbellishData.coreFrame = nsnull; mEmbellishData.leftSpace = 0; mEmbellishData.rightSpace = 0; if (mMathMLChar.Length() != 1) mEmbellishData.direction = NS_STRETCH_DIRECTION_UNSUPPORTED; // else... retain the native direction obtained in ProcessTextData() if (!mFrames.FirstChild()) { return; } mEmbellishData.flags |= NS_MATHML_EMBELLISH_OPERATOR; mEmbellishData.coreFrame = this; // there are two particular things that we also need to record so that if our // parent is , , or , they will treat us properly: // 1) do we have accent="true" // 2) do we have movablelimits="true" // they need the extra information to decide how to treat their scripts/limits // (note: , , or need not necessarily be our // direct parent -- case of embellished operators) // default values from the Operator Dictionary were obtained in ProcessTextData() // and these special bits are always kept in mFlags if (NS_MATHML_OPERATOR_IS_ACCENT(mFlags)) mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENT; if (NS_MATHML_OPERATOR_IS_MOVABLELIMITS(mFlags)) mEmbellishData.flags |= NS_MATHML_EMBELLISH_MOVABLELIMITS; // see if the accent attribute is there GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::accent_, value); if (value.EqualsLiteral("true")) mEmbellishData.flags |= NS_MATHML_EMBELLISH_ACCENT; else if (value.EqualsLiteral("false")) mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_ACCENT; // see if the movablelimits attribute is there GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::movablelimits_, value); if (value.EqualsLiteral("true")) mEmbellishData.flags |= NS_MATHML_EMBELLISH_MOVABLELIMITS; else if (value.EqualsLiteral("false")) mEmbellishData.flags &= ~NS_MATHML_EMBELLISH_MOVABLELIMITS; // --------------------------------------------------------------------- // we will be called again to re-sync the rest of our state next time... // (nobody needs the other values below at this stage) mFlags |= form; return; } nsPresContext* presContext = PresContext(); // beware of bug 133814 - there is a two-way dependency in the // embellished hierarchy: our embellished ancestors need to set // their flags based on some of our state (set above), and here we // need to re-sync our 'form' depending on our outermost embellished // container. A null form here means that an earlier attempt to stretch // our mMathMLChar failed, in which case we don't bother re-stretching again if (form) { // get our outermost embellished container and its parent. // (we ensure that we are the core, not just a sibling of the core) nsIFrame* embellishAncestor = this; nsEmbellishData embellishData; nsIFrame* parentAncestor = this; do { embellishAncestor = parentAncestor; parentAncestor = embellishAncestor->GetParent(); GetEmbellishDataFrom(parentAncestor, embellishData); } while (embellishData.coreFrame == this); // flag if we have an embellished ancestor if (embellishAncestor != this) mFlags |= NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR; else mFlags &= ~NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR; // find the position of our outermost embellished container w.r.t // its siblings. nsIFrame* nextSibling = embellishAncestor->GetNextSibling(); nsIFrame* prevSibling = embellishAncestor->GetPrevSibling(); // flag to distinguish from a real infix if (!prevSibling && !nextSibling) mFlags |= NS_MATHML_OPERATOR_EMBELLISH_ISOLATED; else mFlags &= ~NS_MATHML_OPERATOR_EMBELLISH_ISOLATED; // find our form form = NS_MATHML_OPERATOR_FORM_INFIX; GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::form, value); if (!value.IsEmpty()) { if (value.EqualsLiteral("prefix")) form = NS_MATHML_OPERATOR_FORM_PREFIX; else if (value.EqualsLiteral("postfix")) form = NS_MATHML_OPERATOR_FORM_POSTFIX; } else { // set our form flag depending on the position if (!prevSibling && nextSibling) form = NS_MATHML_OPERATOR_FORM_PREFIX; else if (prevSibling && !nextSibling) form = NS_MATHML_OPERATOR_FORM_POSTFIX; } mFlags &= ~NS_MATHML_OPERATOR_FORM; // clear the old form bits mFlags |= form; // lookup the operator dictionary float lspace = 0.0f; float rspace = 0.0f; nsAutoString data; mMathMLChar.GetData(data); PRBool found = nsMathMLOperators::LookupOperator(data, form, &mFlags, &lspace, &rspace); if (found && (lspace || rspace)) { // cache the default values of lspace & rspace that we get from the dictionary. // since these values are relative to the 'em' unit, convert to twips now nscoord em; nsCOMPtr fm = presContext->GetMetricsFor(GetStyleFont()->mFont); GetEmHeight(fm, em); mEmbellishData.leftSpace = NSToCoordRound(lspace * em); mEmbellishData.rightSpace = NSToCoordRound(rspace * em); // tuning if we don't want too much extra space when we are a script. // (with its fonts, TeX sets lspace=0 & rspace=0 as soon as scriptlevel>0. // Our fonts can be anything, so...) if (GetStyleFont()->mScriptLevel > 0) { if (NS_MATHML_OPERATOR_EMBELLISH_IS_ISOLATED(mFlags)) { // could be an isolated accent or script, e.g., x^{+}, just zero out mEmbellishData.leftSpace = 0; mEmbellishData.rightSpace = 0; } else if (!NS_MATHML_OPERATOR_HAS_EMBELLISH_ANCESTOR(mFlags)) { mEmbellishData.leftSpace /= 2; mEmbellishData.rightSpace /= 2; } } } } // If we are an accent without explicit lspace="." or rspace=".", // we will ignore our default left/right space // lspace = number h-unit | namedspace nscoord leftSpace = mEmbellishData.leftSpace; GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::lspace_, value); if (!value.IsEmpty()) { nsCSSValue cssValue; if (ParseNumericValue(value, cssValue) || ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) { if ((eCSSUnit_Number == cssValue.GetUnit()) && !cssValue.GetFloatValue()) leftSpace = 0; else if (cssValue.IsLengthUnit()) leftSpace = CalcLength(presContext, mStyleContext, cssValue); mFlags |= NS_MATHML_OPERATOR_LEFTSPACE_ATTR; } } // rspace = number h-unit | namedspace nscoord rightSpace = mEmbellishData.rightSpace; GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::rspace_, value); if (!value.IsEmpty()) { nsCSSValue cssValue; if (ParseNumericValue(value, cssValue) || ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) { if ((eCSSUnit_Number == cssValue.GetUnit()) && !cssValue.GetFloatValue()) rightSpace = 0; else if (cssValue.IsLengthUnit()) rightSpace = CalcLength(presContext, mStyleContext, cssValue); mFlags |= NS_MATHML_OPERATOR_RIGHTSPACE_ATTR; } } // little extra tuning to round lspace & rspace to at least a pixel so that // operators don't look as if they are colliding with their operands if (leftSpace || rightSpace) { nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1); if (leftSpace && leftSpace < onePixel) leftSpace = onePixel; if (rightSpace && rightSpace < onePixel) rightSpace = onePixel; } // the values that we get from our attributes override the dictionary mEmbellishData.leftSpace = leftSpace; mEmbellishData.rightSpace = rightSpace; // Now see if there are user-defined attributes that override the dictionary. // XXX If an attribute can be forced to be true when it is false in the // dictionary, then the following code has to change... // For each attribute overriden by the user, turn off its bit flag. // symmetric|movablelimits|separator|largeop|accent|fence|stretchy|form // special: accent and movablelimits are handled above, // don't process them here GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::stretchy_, value); if (value.EqualsLiteral("false")) { mFlags &= ~NS_MATHML_OPERATOR_STRETCHY; } else if (value.EqualsLiteral("true")) { mFlags |= NS_MATHML_OPERATOR_STRETCHY; } if (NS_MATHML_OPERATOR_IS_FENCE(mFlags)) { GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::fence_, value); if (value.EqualsLiteral("false")) mFlags &= ~NS_MATHML_OPERATOR_FENCE; } GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::largeop_, value); if (value.EqualsLiteral("false")) { mFlags &= ~NS_MATHML_OPERATOR_LARGEOP; } else if (value.EqualsLiteral("true")) { mFlags |= NS_MATHML_OPERATOR_LARGEOP; } if (NS_MATHML_OPERATOR_IS_SEPARATOR(mFlags)) { GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::separator_, value); if (value.EqualsLiteral("false")) mFlags &= ~NS_MATHML_OPERATOR_SEPARATOR; } GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::symmetric_, value); if (value.EqualsLiteral("false")) mFlags &= ~NS_MATHML_OPERATOR_SYMMETRIC; else if (value.EqualsLiteral("true")) mFlags |= NS_MATHML_OPERATOR_SYMMETRIC; // minsize = number [ v-unit | h-unit ] | namedspace mMinSize = 0.0; GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::minsize_, value); if (!value.IsEmpty()) { nsCSSValue cssValue; if (ParseNumericValue(value, cssValue) || ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) { nsCSSUnit unit = cssValue.GetUnit(); if (eCSSUnit_Number == unit) mMinSize = cssValue.GetFloatValue(); else if (eCSSUnit_Percent == unit) mMinSize = cssValue.GetPercentValue(); else if (eCSSUnit_Null != unit) { mMinSize = float(CalcLength(presContext, mStyleContext, cssValue)); mFlags |= NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE; } if ((eCSSUnit_Number == unit) || (eCSSUnit_Percent == unit)) { // see if the multiplicative inheritance should be from GetAttribute(nsnull, mPresentationData.mstyle, nsGkAtoms::minsize_, value); if (!value.IsEmpty()) { if (ParseNumericValue(value, cssValue)) { if (cssValue.IsLengthUnit()) { mMinSize *= float(CalcLength(presContext, mStyleContext, cssValue)); mFlags |= NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE; } } } } } } // maxsize = number [ v-unit | h-unit ] | namedspace | infinity mMaxSize = NS_MATHML_OPERATOR_SIZE_INFINITY; GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::maxsize_, value); if (!value.IsEmpty()) { nsCSSValue cssValue; if (ParseNumericValue(value, cssValue) || ParseNamedSpaceValue(mPresentationData.mstyle, value, cssValue)) { nsCSSUnit unit = cssValue.GetUnit(); if (eCSSUnit_Number == unit) mMaxSize = cssValue.GetFloatValue(); else if (eCSSUnit_Percent == unit) mMaxSize = cssValue.GetPercentValue(); else if (eCSSUnit_Null != unit) { mMaxSize = float(CalcLength(presContext, mStyleContext, cssValue)); mFlags |= NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE; } if ((eCSSUnit_Number == unit) || (eCSSUnit_Percent == unit)) { // see if the multiplicative inheritance should be from GetAttribute(nsnull, mPresentationData.mstyle, nsGkAtoms::maxsize_, value); if (!value.IsEmpty()) { if (ParseNumericValue(value, cssValue)) { if (cssValue.IsLengthUnit()) { mMaxSize *= float(CalcLength(presContext, mStyleContext, cssValue)); mFlags |= NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE; } } } } } } } static PRUint32 GetStretchHint(nsOperatorFlags aFlags, nsPresentationData aPresentationData, PRBool aIsVertical) { PRUint32 stretchHint = NS_STRETCH_NONE; // See if it is okay to stretch, // starting from what the Operator Dictionary said if (NS_MATHML_OPERATOR_IS_MUTABLE(aFlags)) { // set the largeop or largeopOnly flags to suitably cover all the // 8 possible cases depending on whether displaystyle, largeop, // stretchy are true or false (see bug 69325). // . largeopOnly is taken if largeop=true and stretchy=false // . largeop is taken if largeop=true and stretchy=true if (NS_MATHML_IS_DISPLAYSTYLE(aPresentationData.flags) && NS_MATHML_OPERATOR_IS_LARGEOP(aFlags)) { stretchHint = NS_STRETCH_LARGEOP; // (largeopOnly, not mask!) if (NS_MATHML_OPERATOR_IS_INTEGRAL(aFlags)) { stretchHint |= NS_STRETCH_INTEGRAL; } if (NS_MATHML_OPERATOR_IS_STRETCHY(aFlags)) { stretchHint |= NS_STRETCH_NEARER | NS_STRETCH_LARGER; } } else if(NS_MATHML_OPERATOR_IS_STRETCHY(aFlags)) { if (aIsVertical) { // TeX hint. Can impact some sloppy markups missing stretchHint = NS_STRETCH_NEARER; } else { stretchHint = NS_STRETCH_NORMAL; } } // else if the stretchy and largeop attributes have been disabled, // the operator is not mutable } return stretchHint; } // NOTE: aDesiredStretchSize is an IN/OUT parameter // On input - it contains our current size // On output - the same size or the new size that we want NS_IMETHODIMP nsMathMLmoFrame::Stretch(nsIRenderingContext& aRenderingContext, nsStretchDirection aStretchDirection, nsBoundingMetrics& aContainerSize, nsHTMLReflowMetrics& aDesiredStretchSize) { 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; nsIFrame* firstChild = mFrames.FirstChild(); // get the axis height; aRenderingContext.SetFont(GetStyleFont()->mFont, PresContext()->GetUserFontSet()); nsCOMPtr fm = aRenderingContext.GetFontMetrics(); nscoord axisHeight, height; GetAxisHeight(aRenderingContext, fm, axisHeight); // get the leading to be left at the top and the bottom of the stretched char // this seems more reliable than using fm->GetLeading() on suspicious fonts nscoord em; GetEmHeight(fm, em); nscoord leading = NSToCoordRound(0.2f * em); // Operators that are stretchy, or those that are to be centered // to cater for fonts that are not math-aware, are handled by the MathMLChar // ('form' is reset if stretch fails -- i.e., we don't bother to stretch next time) PRBool useMathMLChar = UseMathMLChar(); nsBoundingMetrics charSize; nsBoundingMetrics container = aDesiredStretchSize.mBoundingMetrics; PRBool isVertical = PR_FALSE; if (((aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL) || (aStretchDirection == NS_STRETCH_DIRECTION_DEFAULT)) && (mEmbellishData.direction == NS_STRETCH_DIRECTION_VERTICAL)) { isVertical = PR_TRUE; } PRUint32 stretchHint = GetStretchHint(mFlags, mPresentationData, isVertical); if (useMathMLChar) { nsBoundingMetrics initialSize = aDesiredStretchSize.mBoundingMetrics; if (stretchHint != NS_STRETCH_NONE) { container = aContainerSize; // some adjustments if the operator is symmetric and vertical if (isVertical && NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)) { // we need to center about the axis nscoord delta = NS_MAX(container.ascent - axisHeight, container.descent + axisHeight); container.ascent = delta + axisHeight; container.descent = delta - axisHeight; // get ready in case we encounter user-desired min-max size delta = NS_MAX(initialSize.ascent - axisHeight, initialSize.descent + axisHeight); initialSize.ascent = delta + axisHeight; initialSize.descent = delta - axisHeight; } // check for user-desired min-max size if (mMaxSize != NS_MATHML_OPERATOR_SIZE_INFINITY && mMaxSize > 0.0f) { // if we are here, there is a user defined maxsize ... //XXX Set stretchHint = NS_STRETCH_NORMAL? to honor the maxsize as close as possible? if (NS_MATHML_OPERATOR_MAXSIZE_IS_ABSOLUTE(mFlags)) { // there is an explicit value like maxsize="20pt" // try to maintain the aspect ratio of the char float aspect = mMaxSize / float(initialSize.ascent + initialSize.descent); container.ascent = NS_MIN(container.ascent, nscoord(initialSize.ascent * aspect)); container.descent = NS_MIN(container.descent, nscoord(initialSize.descent * aspect)); // below we use a type cast instead of a conversion to avoid a VC++ bug // see http://support.microsoft.com/support/kb/articles/Q115/7/05.ASP container.width = NS_MIN(container.width, (nscoord)mMaxSize); } else { // multiplicative value container.ascent = NS_MIN(container.ascent, nscoord(initialSize.ascent * mMaxSize)); container.descent = NS_MIN(container.descent, nscoord(initialSize.descent * mMaxSize)); container.width = NS_MIN(container.width, nscoord(initialSize.width * mMaxSize)); } if (isVertical && !NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)) { // re-adjust to align the char with the bottom of the initial container height = container.ascent + container.descent; container.descent = aContainerSize.descent; container.ascent = height - container.descent; } } if (mMinSize > 0.0f) { // if we are here, there is a user defined minsize ... // always allow the char to stretch in its natural direction, // even if it is different from the caller's direction if (aStretchDirection != NS_STRETCH_DIRECTION_DEFAULT && aStretchDirection != mEmbellishData.direction) { aStretchDirection = NS_STRETCH_DIRECTION_DEFAULT; // but when we are not honoring the requested direction // we should not use the caller's container size either container = initialSize; } if (NS_MATHML_OPERATOR_MINSIZE_IS_ABSOLUTE(mFlags)) { // there is an explicit value like minsize="20pt" // try to maintain the aspect ratio of the char float aspect = mMinSize / float(initialSize.ascent + initialSize.descent); container.ascent = NS_MAX(container.ascent, nscoord(initialSize.ascent * aspect)); container.descent = NS_MAX(container.descent, nscoord(initialSize.descent * aspect)); container.width = NS_MAX(container.width, (nscoord)mMinSize); } else { // multiplicative value container.ascent = NS_MAX(container.ascent, nscoord(initialSize.ascent * mMinSize)); container.descent = NS_MAX(container.descent, nscoord(initialSize.descent * mMinSize)); container.width = NS_MAX(container.width, nscoord(initialSize.width * mMinSize)); } if (isVertical && !NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags)) { // re-adjust to align the char with the bottom of the initial container height = container.ascent + container.descent; container.descent = aContainerSize.descent; container.ascent = height - container.descent; } } } // let the MathMLChar stretch itself... nsresult res = mMathMLChar.Stretch(PresContext(), aRenderingContext, aStretchDirection, container, charSize, stretchHint); if (NS_FAILED(res)) { // gracefully handle cases where stretching the char failed (i.e., GetBoundingMetrics failed) // clear our 'form' to behave as if the operator wasn't in the dictionary mFlags &= ~NS_MATHML_OPERATOR_FORM; useMathMLChar = PR_FALSE; } } // Child frames of invisble operators are not reflowed if (!NS_MATHML_OPERATOR_IS_INVISIBLE(mFlags)) { // Place our children using the default method // This will allow our child text frame to get its DidReflow() 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 (useMathMLChar) { // update our bounding metrics... it becomes that of our MathML char mBoundingMetrics = charSize; // if the returned direction is 'unsupported', the char didn't actually change. // So we do the centering only if necessary if (mMathMLChar.GetStretchDirection() != NS_STRETCH_DIRECTION_UNSUPPORTED || NS_MATHML_OPERATOR_IS_CENTERED(mFlags)) { PRBool largeopOnly = (NS_STRETCH_LARGEOP & stretchHint) != 0 && (NS_STRETCH_VARIABLE_MASK & stretchHint) == 0; if (isVertical || NS_MATHML_OPERATOR_IS_CENTERED(mFlags)) { // the desired size returned by mMathMLChar maybe different // from the size of the container. // the mMathMLChar.mRect.y calculation is subtle, watch out!!! height = mBoundingMetrics.ascent + mBoundingMetrics.descent; if (NS_MATHML_OPERATOR_IS_SYMMETRIC(mFlags) || NS_MATHML_OPERATOR_IS_CENTERED(mFlags)) { // For symmetric and vertical operators, or for operators that are always // centered ('+', '*', etc) we want to center about the axis of the container mBoundingMetrics.descent = height/2 - axisHeight; } else if (!largeopOnly) { // Align the center of the char with the center of the container mBoundingMetrics.descent = height/2 + (container.ascent + container.descent)/2 - container.ascent; } // else align the baselines mBoundingMetrics.ascent = height - mBoundingMetrics.descent; } } } // Fixup for the final height. // On one hand, our stretchy height can sometimes be shorter than surrounding // ASCII chars, e.g., arrow symbols have |mBoundingMetrics.ascent + leading| // that is smaller than the ASCII's ascent, hence when painting the background // later, it won't look uniform along the line. // On the other hand, sometimes we may leave too much gap when our glyph happens // to come from a font with tall glyphs. For example, since CMEX10 has very tall // glyphs, its natural font metrics are large, even if we pick a small glyph // whose size is comparable to the size of a normal ASCII glyph. // So to avoid uneven spacing in either of these two cases, we use the height // of the ASCII font as a reference and try to match it if possible. // special case for accents... keep them short to improve mouse operations... // an accent can only be the non-first child of , , PRBool isAccent = NS_MATHML_EMBELLISH_IS_ACCENT(mEmbellishData.flags); if (isAccent) { nsEmbellishData parentData; GetEmbellishDataFrom(mParent, parentData); isAccent = (NS_MATHML_EMBELLISH_IS_ACCENTOVER(parentData.flags) || NS_MATHML_EMBELLISH_IS_ACCENTUNDER(parentData.flags)) && parentData.coreFrame != this; } if (isAccent && firstChild) { // see bug 188467 for what is going on here nscoord dy = aDesiredStretchSize.ascent - (mBoundingMetrics.ascent + leading); aDesiredStretchSize.ascent = mBoundingMetrics.ascent + leading; aDesiredStretchSize.height = aDesiredStretchSize.ascent + mBoundingMetrics.descent; firstChild->SetPosition(firstChild->GetPosition() - nsPoint(0, dy)); } else if (useMathMLChar) { nscoord ascent, descent; fm->GetMaxAscent(ascent); fm->GetMaxDescent(descent); aDesiredStretchSize.ascent = NS_MAX(mBoundingMetrics.ascent + leading, ascent); aDesiredStretchSize.height = aDesiredStretchSize.ascent + NS_MAX(mBoundingMetrics.descent + leading, descent); } aDesiredStretchSize.width = mBoundingMetrics.width; aDesiredStretchSize.mBoundingMetrics = mBoundingMetrics; mReference.x = 0; mReference.y = aDesiredStretchSize.ascent; // Place our mMathMLChar, its origin is in our coordinate system if (useMathMLChar) { nscoord dy = aDesiredStretchSize.ascent - mBoundingMetrics.ascent; mMathMLChar.SetRect(nsRect(0, dy, charSize.width, charSize.ascent + charSize.descent)); } // Before we leave... there is a last item in the check-list: // 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. if (!NS_MATHML_OPERATOR_HAS_EMBELLISH_ANCESTOR(mFlags)) { // Account the spacing if we are not an accent with explicit attributes nscoord leftSpace = mEmbellishData.leftSpace; if (isAccent && !NS_MATHML_OPERATOR_HAS_LEFTSPACE_ATTR(mFlags)) { leftSpace = 0; } nscoord rightSpace = mEmbellishData.rightSpace; if (isAccent && !NS_MATHML_OPERATOR_HAS_RIGHTSPACE_ATTR(mFlags)) { rightSpace = 0; } mBoundingMetrics.width += leftSpace + rightSpace; aDesiredStretchSize.width = mBoundingMetrics.width; aDesiredStretchSize.mBoundingMetrics.width = mBoundingMetrics.width; if (leftSpace) { // adjust the offsets mBoundingMetrics.leftBearing += leftSpace; mBoundingMetrics.rightBearing += leftSpace; aDesiredStretchSize.mBoundingMetrics.leftBearing += leftSpace; aDesiredStretchSize.mBoundingMetrics.rightBearing += leftSpace; if (useMathMLChar) { nsRect rect; mMathMLChar.GetRect(rect); mMathMLChar.SetRect(nsRect(rect.x + leftSpace, rect.y, rect.width, rect.height)); } else { nsIFrame* childFrame = firstChild; while (childFrame) { childFrame->SetPosition(childFrame->GetPosition() + nsPoint(leftSpace, 0)); childFrame = childFrame->GetNextSibling(); } } } } // Finished with these: ClearSavedChildMetrics(); // Set our overflow area GatherAndStoreOverflow(&aDesiredStretchSize); // There used to be code here to change the height of the child frame to // change the caret height, but the text frame that manages the caret is now // not a direct child but wrapped in a block frame. See also bug 412033. return NS_OK; } NS_IMETHODIMP nsMathMLmoFrame::InheritAutomaticData(nsIFrame* aParent) { // retain our native direction, it only changes if our text content changes nsStretchDirection direction = mEmbellishData.direction; nsMathMLTokenFrame::InheritAutomaticData(aParent); mEmbellishData.direction = direction; return NS_OK; } NS_IMETHODIMP nsMathMLmoFrame::TransmitAutomaticData() { // this will cause us to re-sync our flags from scratch // but our returned 'form' is still not final (bug 133429), it will // be recomputed to its final value during the next call in Reflow() mEmbellishData.coreFrame = nsnull; ProcessOperatorData(); return NS_OK; } NS_IMETHODIMP nsMathMLmoFrame::Reflow(nsPresContext* aPresContext, nsHTMLReflowMetrics& aDesiredSize, const nsHTMLReflowState& aReflowState, nsReflowStatus& aStatus) { // certain values use units that depend on our style context, so // it is safer to just process the whole lot here ProcessOperatorData(); // play safe by not passing invisible operators to the font subsystem because // some platforms risk selecting strange glyphs for them and give bad inter-space if (NS_MATHML_OPERATOR_IS_INVISIBLE(mFlags)) { // return empty space for now, but this is not yet final since there // can be lspace and rspace attributes that reclaim some room. // These will be dealt with later in Stretch(). aDesiredSize.width = 0; aDesiredSize.height = 0; aDesiredSize.ascent = 0; aDesiredSize.mBoundingMetrics.Clear(); aStatus = NS_FRAME_COMPLETE; NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize); return NS_OK; } return nsMathMLTokenFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus); } /* virtual */ void nsMathMLmoFrame::MarkIntrinsicWidthsDirty() { // if we get this, it may mean that something changed in the text // content. So blow away everything an re-build the automatic data // from the parent of our outermost embellished container (we ensure // that we are the core, not just a sibling of the core) ProcessTextData(); nsIFrame* target = this; nsEmbellishData embellishData; do { target = target->GetParent(); GetEmbellishDataFrom(target, embellishData); } while (embellishData.coreFrame == this); // we have automatic data to update in the children of the target frame // XXXldb This should really be marking dirty rather than rebuilding // so that we don't rebuild multiple times for the same change. RebuildAutomaticDataForChildren(target); nsMathMLContainerFrame::MarkIntrinsicWidthsDirty(); } /* virtual */ nscoord nsMathMLmoFrame::GetIntrinsicWidth(nsIRenderingContext *aRenderingContext) { ProcessOperatorData(); nscoord width; if (UseMathMLChar()) { PRUint32 stretchHint = GetStretchHint(mFlags, mPresentationData, PR_TRUE); width = mMathMLChar. GetMaxWidth(PresContext(), *aRenderingContext, stretchHint, mMaxSize, NS_MATHML_OPERATOR_MAXSIZE_IS_ABSOLUTE(mFlags)); } else { width = nsMathMLTokenFrame::GetIntrinsicWidth(aRenderingContext); } // leftSpace and rightSpace are actually applied to the outermost // embellished container but for determining total intrinsic width it should // be safe to include it for the core here instead. width += mEmbellishData.leftSpace + mEmbellishData.rightSpace; return width; } NS_IMETHODIMP nsMathMLmoFrame::AttributeChanged(PRInt32 aNameSpaceID, nsIAtom* aAttribute, PRInt32 aModType) { // check if this is an attribute that can affect the embellished hierarchy // in a significant way and re-layout the entire hierarchy. if (nsGkAtoms::accent_ == aAttribute || nsGkAtoms::movablelimits_ == aAttribute) { // set the target as the parent of our outermost embellished container // (we ensure that we are the core, not just a sibling of the core) nsIFrame* target = this; nsEmbellishData embellishData; do { target = target->GetParent(); GetEmbellishDataFrom(target, embellishData); } while (embellishData.coreFrame == this); // we have automatic data to update in the children of the target frame return ReLayoutChildren(target); } return nsMathMLTokenFrame:: AttributeChanged(aNameSpaceID, aAttribute, aModType); } // ---------------------- // No need to track the style context given to our MathML char. // the Style System will use these to pass the proper style context to our MathMLChar nsStyleContext* nsMathMLmoFrame::GetAdditionalStyleContext(PRInt32 aIndex) const { switch (aIndex) { case NS_MATHML_CHAR_STYLE_CONTEXT_INDEX: return mMathMLChar.GetStyleContext(); default: return nsnull; } } void nsMathMLmoFrame::SetAdditionalStyleContext(PRInt32 aIndex, nsStyleContext* aStyleContext) { switch (aIndex) { case NS_MATHML_CHAR_STYLE_CONTEXT_INDEX: mMathMLChar.SetStyleContext(aStyleContext); break; } }