C++ (Cpp) NS_MATHML_OPERATOR_IS_STRETCHY Examples

Example #1

File: nsMathMLmoFrame.cpp Project: RickEyre/mozilla-central

static uint32_t
GetStretchHint(nsOperatorFlags aFlags, nsPresentationData aPresentationData,
               bool aIsVertical)
{
  uint32_t 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;
}

Example #2

File: nsMathMLOperators.cpp Project: MozillaOnline/gecko-dev

PRBool
nsMathMLOperators::IsMutableOperator(const nsString& aOperator)
{
  if (!gInitialized) {
    InitGlobals();
  }
  // lookup all the variants of the operator and return true if there
  // is a variant that is stretchy or largeop
  nsOperatorFlags flags[4];
  float lspace[4], rspace[4];
  nsMathMLOperators::LookupOperators(aOperator, flags, lspace, rspace);
  nsOperatorFlags allFlags =
    flags[NS_MATHML_OPERATOR_FORM_INFIX] |
    flags[NS_MATHML_OPERATOR_FORM_POSTFIX] |
    flags[NS_MATHML_OPERATOR_FORM_PREFIX];
  return NS_MATHML_OPERATOR_IS_STRETCHY(allFlags) ||
         NS_MATHML_OPERATOR_IS_LARGEOP(allFlags);
}

Example #3

File: nsMathMLmoFrame.cpp Project: RickEyre/mozilla-central

// get the text that we enclose and setup our nsMathMLChar
void
nsMathMLmoFrame::ProcessTextData()
{
  mFlags = 0;

  nsAutoString data;
  nsContentUtils::GetNodeTextContent(mContent, false, data);
  data.CompressWhitespace();
  int32_t 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, 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;

  bool 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();
}