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gecko/layout/mathml/nsMathMLmoFrame.cpp
L. David Baron 2c717f398d Switch lots of callers to using nsLayoutUtils::GetFontMetricsForFrame and nsLayoutUtils::GetFontMetricsForStyleContext. (Bug 678671, patch 1) r=roc 
This changes a number of callers that were previously bypassing the use
of the correct language (with either no language or the charset-detected
language on the pres context via nsPresContext::GetMetricsFor) and/or
the correct user font set to pass the correct values, which should
improve the correctness of the behavior of whatever they were using the
fonts for, and also reduce the number of unique sets of font metrics
requested (which helps nsFontCache effectiveness).
2011-08-14 10:08:04 -07:00

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/* -*- 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 <rbs@maths.uq.edu.au>
* David J. Fiddes <D.J.Fiddes@hw.ac.uk>
* Shyjan Mahamud <mahamud@cs.cmu.edu>
* Pierre Phaneuf <pp@ludusdesign.com>
* Frederic Wang <fred.wang@free.fr>
*
* 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 "nsRenderingContext.h"
#include "nsContentUtils.h"
#include "nsMathMLmoFrame.h"
//
// <mo> -- 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 <mo>-</mo> 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) || // &minus;
(ch == 0x2264) || // &le;
(ch == 0x2265) || // &ge;
(ch == 0x00D7)) { // &times;
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 <mover>, <munder>, or <munderover>, 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: <mover>, <munder>, or <munderover> 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;
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
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 <mstyle>
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 <mstyle>
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 <mrow></mrow>
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(nsRenderingContext& 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;
nsRefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm));
aRenderingContext.SetFont(fm);
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 <mover>, <munder>, <munderover>
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 = fm->MaxAscent();
nscoord descent = fm->MaxDescent();
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 = nsBoundingMetrics();
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(nsRenderingContext *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;
}
}
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