/**
- * \file InsetMathFrac.cpp
+ * \file InsetMathFracBase.cpp
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Alejandro Aguilar Sierra
- * \author André Pönitz
+ * \author André Pönitz
+ * \author Uwe Stöhr
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "InsetMathFrac.h"
+
#include "MathData.h"
+#include "MathParser.h"
#include "MathStream.h"
-#include "TextPainter.h"
-#include "LaTeXFeatures.h"
-#include "Color.h"
+#include "MathSupport.h"
+
#include "Cursor.h"
+#include "LaTeXFeatures.h"
+#include "MetricsInfo.h"
+#include "TextPainter.h"
+
+#include "frontends/FontMetrics.h"
#include "frontends/Painter.h"
+#include "support/lassert.h"
+
+using namespace std;
+
namespace lyx {
-InsetMathFrac::InsetMathFrac(Kind kind, InsetMath::idx_type ncells)
- : InsetMathFracBase(ncells), kind_(kind)
+/////////////////////////////////////////////////////////////////////
+//
+// InsetMathFracBase
+//
+/////////////////////////////////////////////////////////////////////
+
+
+InsetMathFracBase::InsetMathFracBase(Buffer * buf, idx_type ncells)
+ : InsetMathNest(buf, ncells)
+{}
+
+
+bool InsetMathFracBase::idxUpDown(Cursor & cur, bool up) const
+{
+ // If we only have one cell, target = 0, otherwise
+ // target = up ? 0 : 1, since upper cell has idx 0
+ InsetMath::idx_type target = nargs() > 1 ? !up : 0;
+ if (cur.idx() == target)
+ return false;
+ cur.idx() = target;
+ cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
+ return true;
+}
+
+
+
+/////////////////////////////////////////////////////////////////////
+//
+// InsetMathFrac
+//
+/////////////////////////////////////////////////////////////////////
+
+
+InsetMathFrac::InsetMathFrac(Buffer * buf, Kind kind, InsetMath::idx_type ncells)
+ : InsetMathFracBase(buf, ncells), kind_(kind)
{}
}
-bool InsetMathFrac::idxRight(Cursor & cur) const
+bool InsetMathFrac::idxForward(Cursor & cur) const
{
- InsetMath::idx_type target;
+ InsetMath::idx_type target = 0;
if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
if (nargs() == 3)
target = 0;
else if (nargs() == 2)
target = 1;
} else
- return false;
+ return false;
if (cur.idx() == target)
return false;
cur.idx() = target;
- cur.pos() = cell(target).x2pos(cur.x_target());
+ cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
return true;
}
-bool InsetMathFrac::idxLeft(Cursor & cur) const
+bool InsetMathFrac::idxBackward(Cursor & cur) const
{
- InsetMath::idx_type target;
+ InsetMath::idx_type target = 0;
if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
if (nargs() == 3)
target = 2;
else if (nargs() == 2)
target = 0;
} else
- return false;
+ return false;
if (cur.idx() == target)
return false;
cur.idx() = target;
- cur.pos() = cell(target).x2pos(cur.x_target());
+ cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
return true;
}
+MathClass InsetMathFrac::mathClass() const
+{
+ // Generalized fractions are of inner class (see The TeXbook, p. 292)
+ // But stuff from the unit/nicefrac packages are not real fractions.
+ MathClass mc = MC_ORD;
+ switch (kind_) {
+ case ATOP:
+ case OVER:
+ case FRAC:
+ case DFRAC:
+ case TFRAC:
+ case CFRAC:
+ case CFRACLEFT:
+ case CFRACRIGHT:
+ mc = MC_INNER;
+ break;
+ case NICEFRAC:
+ case UNITFRAC:
+ case UNIT:
+ break;
+ }
+ return mc;
+}
+
+
+
+namespace {
+
+// align the top of M in the cell with the top of M in the surrounding font
+int dy_for_nicefrac(MetricsBase & mb)
+{
+ // this is according to nicefrac.sty
+ int big_m = theFontMetrics(mb.font).ascent('M');
+ Changer dummy = mb.changeScript();
+ int small_m = theFontMetrics(mb.font).ascent('M');
+ return big_m - small_m;
+}
+
+
+// symbol for nicefrac solidus
+latexkeys const * slash_symbol()
+{
+ return in_word_set(from_ascii("slash"));
+}
+
+} // namespace
+
+
void InsetMathFrac::metrics(MetricsInfo & mi, Dimension & dim) const
{
- if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
- if (nargs() == 1) {
- ShapeChanger dummy2(mi.base.font, Font::UP_SHAPE);
- cell(0).metrics(mi);
- dim.wid = cell(0).width()+ 3;
- dim.asc = cell(0).ascent();
- dim.des = cell(0).descent();
- } else if (nargs() == 2) {
- cell(0).metrics(mi);
- ShapeChanger dummy2(mi.base.font, Font::UP_SHAPE);
- cell(1).metrics(mi);
- dim.wid = cell(0).width() + cell(1).width() + 5;
- dim.asc = std::max(cell(0).ascent(), cell(1).ascent());
- dim.des = std::max(cell(0).descent(), cell(1).descent());
- } else {
- cell(2).metrics(mi);
- ShapeChanger dummy2(mi.base.font, Font::UP_SHAPE);
- FracChanger dummy(mi.base);
- cell(0).metrics(mi);
- cell(1).metrics(mi);
- dim.wid = cell(0).width() + cell(1).width() + cell(2).width() + 10;
- dim.asc = std::max(cell(2).ascent(), cell(0).height() + 5);
- dim.des = std::max(cell(2).descent(), cell(1).height() - 5);
+ Dimension dim0, dim1, dim2;
+ Changer dummy3 = mi.base.changeEnsureMath();
+
+ switch (kind_) {
+ case UNIT: {
+ // \unitone, \unittwo
+ dim.wid = 0;
+ int unit_cell = 0;
+ // is there an extra cell holding the value being given a dimension?
+ // (this is \unittwo)
+ if (nargs() == 2) {
+ cell(0).metrics(mi, dim1);
+ dim.wid += dim1.wid + 4;
+ unit_cell = 1;
}
- } else {
- FracChanger dummy(mi.base);
- cell(0).metrics(mi);
- cell(1).metrics(mi);
- if (kind_ == NICEFRAC) {
- dim.wid = cell(0).width() + cell(1).width() + 5;
- dim.asc = cell(0).height() + 5;
- dim.des = cell(1).height() - 5;
- } else if (kind_ == UNITFRAC) {
- ShapeChanger dummy2(mi.base.font, Font::UP_SHAPE);
- dim.wid = cell(0).width() + cell(1).width() + 5;
- dim.asc = cell(0).height() + 5;
- dim.des = cell(1).height() - 5;
- } else {
- dim.wid = std::max(cell(0).width(), cell(1).width()) + 2;
- dim.asc = cell(0).height() + 2 + 5;
- dim.des = cell(1).height() + 2 - 5;
+ Changer dummy = mi.base.font.changeShape(UP_SHAPE);
+ cell(unit_cell).metrics(mi, dim0);
+ dim.wid += dim0.width() + 1;
+ dim.asc = max(dim0.asc, dim1.asc);
+ dim.des = max(dim0.des, dim1.des);
+ }
+ break;
+
+ case UNITFRAC:
+ case NICEFRAC: {
+ // \unitfrac, \unitfracthree, \nicefrac
+ dim.wid = 0;
+ dim.asc = 0;
+ dim.des = 0;
+ int const dy = dy_for_nicefrac(mi.base);
+ // is there an extra cell holding the value being given a dimension?
+ // (this is \unitfracthree)
+ if (kind_ == UNITFRAC && nargs() == 3) {
+ cell(2).metrics(mi, dim2);
+ dim.wid += dim2.wid + 4;
+ dim.asc = dim2.asc;
+ dim.des = dim2.des;
+ }
+ Changer dummy = (kind_ == UNITFRAC) ? mi.base.font.changeShape(UP_SHAPE)
+ : Changer();
+ Changer dummy2 = mi.base.changeScript();
+ if (latexkeys const * slash = slash_symbol()) {
+ Dimension dimslash;
+ mathedSymbolDim(mi.base, dimslash, slash);
+ dim.wid += dimslash.wid - mathed_mu(mi.base.font, 3.0);
+ dim.asc = max(dim.asc, dimslash.asc);
+ dim.des = max(dim.des, dimslash.des);
}
+ cell(0).metrics(mi, dim0);
+ cell(1).metrics(mi, dim1);
+ dim.wid += dim0.wid + dim1.wid + 2;
+ dim.asc = max(max(dim.asc, dim0.asc + dy), dim1.asc);
+ dim.des = max(max(dim.des, dim0.des - dy), dim1.des);
+ }
+ break;
+
+ case FRAC:
+ case CFRAC:
+ case CFRACLEFT:
+ case CFRACRIGHT:
+ case DFRAC:
+ case TFRAC:
+ case OVER:
+ case ATOP: {
+ int const dy = axis_height(mi.base);
+ Changer dummy =
+ // \tfrac is always in text size
+ (kind_ == TFRAC) ? mi.base.font.changeStyle(LM_ST_SCRIPT) :
+ // \cfrac and \dfrac are always in display size
+ (kind_ == CFRAC
+ || kind_ == CFRACLEFT
+ || kind_ == CFRACRIGHT
+ || kind_ == DFRAC) ? mi.base.font.changeStyle(LM_ST_DISPLAY) :
+ // all others
+ mi.base.changeFrac();
+ Changer dummy2 = mi.base.changeEnsureMath();
+ cell(0).metrics(mi, dim0);
+ cell(1).metrics(mi, dim1);
+ dim.wid = max(dim0.wid, dim1.wid) + 2;
+ dim.asc = dim0.height() + dy/2 + dy;
+ int const t = mi.base.solidLineThickness();
+ dim.des = max(0, dim1.height() + dy/2 - dy + t);
}
- metricsMarkers(dim);
- // Cache the inset dimension.
- setDimCache(mi, dim);
+ } //switch (kind_)
}
void InsetMathFrac::draw(PainterInfo & pi, int x, int y) const
{
- setPosCache(pi, x, y);
+ Changer dummy3 = pi.base.changeEnsureMath();
Dimension const dim = dimension(*pi.base.bv);
- int m = x + dim.wid / 2;
- if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
- if (nargs() == 1) {
- ShapeChanger dummy2(pi.base.font, Font::UP_SHAPE);
- cell(0).draw(pi, x + 1, y);
- } else if (nargs() == 2) {
- cell(0).draw(pi, x + 1, y);
- ShapeChanger dummy2(pi.base.font, Font::UP_SHAPE);
- cell(1).draw(pi, x + cell(0).width() + 5, y);
- } else {
- cell(2).draw(pi, x + 1, y);
- ShapeChanger dummy2(pi.base.font, Font::UP_SHAPE);
- FracChanger dummy(pi.base);
- int xx = x + cell(2).width() + 5;
- cell(0).draw(pi, xx + 2,
- y - cell(0).descent() - 5);
- cell(1).draw(pi, xx + cell(0).width() + 5,
- y + cell(1).ascent() / 2);
- }
- } else {
- FracChanger dummy(pi.base);
- if (kind_ == NICEFRAC) {
- cell(0).draw(pi, x + 2,
- y - cell(0).descent() - 5);
- cell(1).draw(pi, x + cell(0).width() + 5,
- y + cell(1).ascent() / 2);
- } else if (kind_ == UNITFRAC) {
- ShapeChanger dummy2(pi.base.font, Font::UP_SHAPE);
- cell(0).draw(pi, x + 2,
- y - cell(0).descent() - 5);
- cell(1).draw(pi, x + cell(0).width() + 5,
- y + cell(1).ascent() / 2);
- } else {
- // Classical fraction
- cell(0).draw(pi, m - cell(0).width() / 2,
- y - cell(0).descent() - 2 - 5);
- cell(1).draw(pi, m - cell(1).width() / 2,
- y + cell(1).ascent() + 2 - 5);
+ Dimension const dim0 = cell(0).dimension(*pi.base.bv);
+ switch (kind_) {
+ case UNIT: {
+ // \unitone, \unittwo
+ int xx = x;
+ int unit_cell = 0;
+ // is there an extra cell holding the value being given a dimension?
+ // (this is \unittwo)
+ if (nargs() == 2) {
+ cell(0).draw(pi, x, y);
+ xx += dim0.wid + 4;
+ unit_cell = 1;
}
+ Changer dummy = pi.base.font.changeShape(UP_SHAPE);
+ cell(unit_cell).draw(pi, xx, y);
}
- if (kind_ == NICEFRAC || kind_ == UNITFRAC) {
- // Diag line:
+ break;
+
+ case UNITFRAC:
+ case NICEFRAC: {
+ // \unitfrac, \unitfracthree, \nicefrac
int xx = x;
- if (nargs() == 3)
- xx += cell(2).width() + 5;
- pi.pain.line(xx + cell(0).width(),
- y + dim.des - 2,
- xx + cell(0).width() + 5,
- y - dim.asc + 2, Color::math);
+ int const dy = dy_for_nicefrac(pi.base);
+ // is there an extra cell holding the value being given a dimension?
+ // (this is \unitfracthree)
+ if (kind_ == UNITFRAC && nargs() == 3) {
+ cell(2).draw(pi, x, y);
+ xx += cell(2).dimension(*pi.base.bv).wid + 4;
+ }
+ Changer dummy = (kind_ == UNITFRAC) ? pi.base.font.changeShape(UP_SHAPE)
+ : Changer();
+ // nice fraction
+ Changer dummy2 = pi.base.changeScript();
+ cell(0).draw(pi, xx + 1, y - dy);
+ // reference LaTeX code from nicefrac.sty:
+ // \mkern-2mu/\mkern-1mu
+ if (latexkeys const * slash = slash_symbol()) {
+ int mkern = mathed_mu(pi.base.font, 2.0);
+ mathedSymbolDraw(pi, xx + 1 + dim0.wid - mkern, y, slash);
+ Dimension dimslash;
+ mathedSymbolDim(pi.base, dimslash, slash);
+ xx += dimslash.wid - mathed_mu(pi.base.font, 3.0);
+ }
+ cell(1).draw(pi, xx + 1 + dim0.wid, y);
+ }
+ break;
+
+ case FRAC:
+ case CFRAC:
+ case CFRACLEFT:
+ case CFRACRIGHT:
+ case DFRAC:
+ case TFRAC:
+ case OVER:
+ case ATOP: {
+ int const dy = axis_height(pi.base);
+ Changer dummy =
+ // \tfrac is always in text size
+ (kind_ == TFRAC) ? pi.base.font.changeStyle(LM_ST_SCRIPT) :
+ // \cfrac and \dfrac are always in display size
+ (kind_ == CFRAC
+ || kind_ == CFRACLEFT
+ || kind_ == CFRACRIGHT
+ || kind_ == DFRAC) ? pi.base.font.changeStyle(LM_ST_DISPLAY) :
+ // all others
+ pi.base.changeFrac();
+ Dimension const dim1 = cell(1).dimension(*pi.base.bv);
+ int const m = x + dim.wid / 2;
+ int const xx =
+ // align left
+ (kind_ == CFRACLEFT) ? x + 1 :
+ // align right
+ (kind_ == CFRACRIGHT) ? x + dim.wid - dim0.wid - 2 :
+ // center
+ m - dim0.wid / 2;
+ int const t = pi.base.solidLineThickness();
+ // take dy/2 for the spacing around the horizontal line. This is
+ // arbitrary. In LaTeX it is more complicated to ensure that displayed
+ // fractions line up next to each other.
+ // For more accurate implementation refer to the TeXbook, Appendix G,
+ // rules 15a-e.
+ cell(0).draw(pi, xx, y - dim0.des - dy/2 - dy);
+ // center
+ cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + dy/2 - dy + t);
+ // horizontal line
+ if (kind_ != ATOP)
+ pi.pain.line(x, y - dy, x + dim.wid, y - dy,
+ pi.base.font.color(), pi.pain.line_solid, t);
}
- if (kind_ == FRAC || kind_ == OVER)
- pi.pain.line(x + 1, y - 5,
- x + dim.wid - 2, y - 5, Color::math);
- drawMarkers(pi, x, y);
+ } //switch (kind_)
}
void InsetMathFrac::metricsT(TextMetricsInfo const & mi, Dimension & dim) const
{
- cell(0).metricsT(mi, dim);
- cell(1).metricsT(mi, dim);
- dim.wid = std::max(cell(0).width(), cell(1).width());
- dim.asc = cell(0).height() + 1;
- dim.des = cell(1).height();
+ Dimension dim0, dim1;
+ cell(0).metricsT(mi, dim0);
+ cell(1).metricsT(mi, dim1);
+ dim.wid = max(dim0.width(), dim1.wid);
+ dim.asc = dim0.height() + 1;
+ dim.des = dim1.height();
}
-void InsetMathFrac::drawT(TextPainter & pain, int x, int y) const
+void InsetMathFrac::drawT(TextPainter & /*pain*/, int /*x*/, int /*y*/) const
{
// FIXME: BROKEN!
+ /*
Dimension dim;
int m = x + dim.width() / 2;
- cell(0).drawT(pain, m - cell(0).width() / 2, y - cell(0).descent() - 1);
- cell(1).drawT(pain, m - cell(1).width() / 2, y + cell(1).ascent());
+ cell(0).drawT(pain, m - dim0.width() / 2, y - dim0.des - 1);
+ cell(1).drawT(pain, m - dim1.wid / 2, y + dim1.asc);
// ASCII art: ignore niceties
if (kind_ == FRAC || kind_ == OVER || kind_ == NICEFRAC || kind_ == UNITFRAC)
pain.horizontalLine(x, y, dim.width());
+ */
}
void InsetMathFrac::write(WriteStream & os) const
{
+ MathEnsurer ensurer(os);
switch (kind_) {
case ATOP:
+ // \\atop is only for compatibility, \\binom is the
+ // LaTeX2e successor
os << '{' << cell(0) << "\\atop " << cell(1) << '}';
break;
case OVER:
os << "\\frac{" << cell(0) << "}{" << cell(1) << '}';
break;
case FRAC:
+ case DFRAC:
+ case TFRAC:
case NICEFRAC:
+ case CFRAC:
case UNITFRAC:
if (nargs() == 2)
InsetMathNest::write(os);
else
os << "\\unit{" << cell(0) << '}';
break;
+ case CFRACLEFT:
+ os << "\\cfrac[l]{" << cell(0) << "}{" << cell(1) << '}';
+ break;
+ case CFRACRIGHT:
+ os << "\\cfrac[r]{" << cell(0) << "}{" << cell(1) << '}';
+ break;
}
}
switch (kind_) {
case FRAC:
return from_ascii("frac");
+ case CFRAC:
+ case CFRACLEFT:
+ case CFRACRIGHT:
+ return from_ascii("cfrac");
+ case DFRAC:
+ return from_ascii("dfrac");
+ case TFRAC:
+ return from_ascii("tfrac");
case OVER:
return from_ascii("over");
case NICEFRAC:
void InsetMathFrac::maple(MapleStream & os) const
{
+ if (nargs() != 2) {
+ // Someone who knows about maple should fix this.
+ LASSERT(false, return);
+ }
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::mathematica(MathematicaStream & os) const
{
+ if (nargs() != 2) {
+ // Someone who knows about mathematica should fix this.
+ LASSERT(false, return);
+ }
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::octave(OctaveStream & os) const
{
+ if (nargs() != 2) {
+ // Someone who knows about octave should fix this.
+ LASSERT(false, return);
+ }
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::mathmlize(MathStream & os) const
{
- os << MTag("mfrac") << cell(0) << cell(1) << ETag("mfrac");
+ switch (kind_) {
+ case ATOP:
+ os << MTag("mfrac", "linethickeness='0'")
+ << MTag("mrow") << cell(0) << ETag("mrow")
+ << MTag("mrow") << cell(1) << ETag("mrow")
+ << ETag("mfrac");
+ break;
+
+ // we do not presently distinguish these
+ case OVER:
+ case FRAC:
+ case DFRAC:
+ case TFRAC:
+ case CFRAC:
+ case CFRACLEFT:
+ case CFRACRIGHT:
+ os << MTag("mfrac")
+ << MTag("mrow") << cell(0) << ETag("mrow")
+ << MTag("mrow") << cell(1) << ETag("mrow")
+ << ETag("mfrac");
+ break;
+
+ case NICEFRAC:
+ os << MTag("mfrac", "bevelled='true'")
+ << MTag("mrow") << cell(0) << ETag("mrow")
+ << MTag("mrow") << cell(1) << ETag("mrow")
+ << ETag("mfrac");
+ break;
+
+ case UNITFRAC:
+ if (nargs() == 3)
+ os << cell(2);
+ os << MTag("mfrac", "bevelled='true'")
+ << MTag("mrow") << cell(0) << ETag("mrow")
+ << MTag("mrow") << cell(1) << ETag("mrow")
+ << ETag("mfrac");
+ break;
+
+ case UNIT:
+ // FIXME This is not right, because we still output mi, etc,
+ // when we output the cell. So we need to prevent that somehow.
+ if (nargs() == 2)
+ os << cell(0)
+ << MTag("mstyle mathvariant='normal'")
+ << cell(1)
+ << ETag("mstyle");
+ else
+ os << MTag("mstyle mathvariant='normal'")
+ << cell(0)
+ << ETag("mstyle");
+ }
+}
+
+
+void InsetMathFrac::htmlize(HtmlStream & os) const
+{
+ switch (kind_) {
+ case ATOP:
+ os << MTag("span", "class='frac'")
+ << MTag("span", "class='numer'") << cell(0) << ETag("span")
+ << MTag("span", "class='numer'") << cell(1) << ETag("span")
+ << ETag("span");
+ break;
+
+ // we do not presently distinguish these
+ case OVER:
+ case FRAC:
+ case DFRAC:
+ case TFRAC:
+ case CFRAC:
+ case CFRACLEFT:
+ case CFRACRIGHT:
+ os << MTag("span", "class='frac'")
+ << MTag("span", "class='numer'") << cell(0) << ETag("span")
+ << MTag("span", "class='denom'") << cell(1) << ETag("span")
+ << ETag("span");
+ break;
+
+ case NICEFRAC:
+ os << cell(0) << '/' << cell(1);
+ break;
+
+ case UNITFRAC:
+ if (nargs() == 3)
+ os << cell(2) << ' ';
+ os << cell(0) << '/' << cell(1);
+ break;
+
+ case UNIT:
+ // FIXME This is not right, because we still output i, etc,
+ // when we output the cell. So we need to prevent that somehow.
+ if (nargs() == 2)
+ os << cell(0)
+ << MTag("span")
+ << cell(1)
+ << ETag("span");
+ else
+ os << MTag("span")
+ << cell(0)
+ << ETag("span");
+ }
}
{
if (kind_ == NICEFRAC || kind_ == UNITFRAC || kind_ == UNIT)
features.require("units");
+ if (kind_ == CFRAC || kind_ == CFRACLEFT || kind_ == CFRACRIGHT
+ || kind_ == DFRAC || kind_ == TFRAC)
+ features.require("amsmath");
+ if (features.runparams().math_flavor == OutputParams::MathAsHTML)
+ // CSS adapted from eLyXer
+ features.addCSSSnippet(
+ "span.frac{display: inline-block; vertical-align: middle; text-align:center;}\n"
+ "span.numer{display: block;}\n"
+ "span.denom{display: block; border-top: thin solid #000040;}");
InsetMathNest::validate(features);
}
+/////////////////////////////////////////////////////////////////////
+//
+// InsetMathBinom
+//
+/////////////////////////////////////////////////////////////////////
+
+
+InsetMathBinom::InsetMathBinom(Buffer * buf, Kind kind)
+ : InsetMathFracBase(buf), kind_(kind)
+{}
+
+
+Inset * InsetMathBinom::clone() const
+{
+ return new InsetMathBinom(*this);
+}
+
+
+int InsetMathBinom::dw(int height) const
+{
+ int w = height / 5;
+ if (w > 15)
+ w = 15;
+ if (w < 6)
+ w = 6;
+ return w;
+}
+
+
+void InsetMathBinom::metrics(MetricsInfo & mi, Dimension & dim) const
+{
+ Changer dummy2 = mi.base.changeEnsureMath();
+ Dimension dim0, dim1;
+ int const dy = axis_height(mi.base);
+ Changer dummy =
+ (kind_ == DBINOM) ? mi.base.font.changeStyle(LM_ST_DISPLAY) :
+ (kind_ == TBINOM) ? mi.base.font.changeStyle(LM_ST_SCRIPT) :
+ mi.base.changeFrac();
+ cell(0).metrics(mi, dim0);
+ cell(1).metrics(mi, dim1);
+ dim.asc = dim0.height() + 1 + dy/2 + dy;
+ dim.des = max(0, dim1.height() + 1 + dy/2 - dy);
+ dim.wid = max(dim0.wid, dim1.wid) + 2 * dw(dim.height()) + 4;
+}
+
+
+void InsetMathBinom::draw(PainterInfo & pi, int x, int y) const
+{
+ Changer dummy2 = pi.base.changeEnsureMath();
+ Dimension const dim = dimension(*pi.base.bv);
+ Dimension const & dim0 = cell(0).dimension(*pi.base.bv);
+ Dimension const & dim1 = cell(1).dimension(*pi.base.bv);
+ int const dy = axis_height(pi.base);
+ // define the binom brackets
+ docstring const bra = kind_ == BRACE ? from_ascii("{") :
+ kind_ == BRACK ? from_ascii("[") : from_ascii("(");
+ docstring const ket = kind_ == BRACE ? from_ascii("}") :
+ kind_ == BRACK ? from_ascii("]") : from_ascii(")");
+
+ int m = x + dim.width() / 2;
+ {
+ Changer dummy =
+ (kind_ == DBINOM) ? pi.base.font.changeStyle(LM_ST_DISPLAY) :
+ (kind_ == TBINOM) ? pi.base.font.changeStyle(LM_ST_SCRIPT) :
+ pi.base.changeFrac();
+ // take dy both for the vertical alignment and for the spacing between
+ // cells
+ cell(0).draw(pi, m - dim0.wid / 2, y - dim0.des - dy/2 - dy);
+ cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + dy/2 - dy);
+ }
+ // draw the brackets and the marker
+ mathed_draw_deco(pi, x, y - dim.ascent(), dw(dim.height()),
+ dim.height(), bra);
+ mathed_draw_deco(pi, x + dim.width() - dw(dim.height()),
+ y - dim.ascent(), dw(dim.height()), dim.height(), ket);
+}
+
+
+bool InsetMathBinom::extraBraces() const
+{
+ return kind_ == CHOOSE || kind_ == BRACE || kind_ == BRACK;
+}
+
+
+void InsetMathBinom::write(WriteStream & os) const
+{
+ MathEnsurer ensurer(os);
+ switch (kind_) {
+ case BINOM:
+ os << "\\binom{" << cell(0) << "}{" << cell(1) << '}';
+ break;
+ case DBINOM:
+ os << "\\dbinom{" << cell(0) << "}{" << cell(1) << '}';
+ break;
+ case TBINOM:
+ os << "\\tbinom{" << cell(0) << "}{" << cell(1) << '}';
+ break;
+ case CHOOSE:
+ os << '{' << cell(0) << " \\choose " << cell(1) << '}';
+ break;
+ case BRACE:
+ os << '{' << cell(0) << " \\brace " << cell(1) << '}';
+ break;
+ case BRACK:
+ os << '{' << cell(0) << " \\brack " << cell(1) << '}';
+ break;
+ }
+}
+
+
+void InsetMathBinom::normalize(NormalStream & os) const
+{
+ os << "[binom " << cell(0) << ' ' << cell(1) << ']';
+}
+
+
+void InsetMathBinom::mathmlize(MathStream & os) const
+{
+ char ldelim = ' ';
+ char rdelim = ' ';
+ switch (kind_) {
+ case BINOM:
+ case TBINOM:
+ case DBINOM:
+ case CHOOSE:
+ ldelim = '(';
+ rdelim = ')';
+ break;
+ case BRACE:
+ ldelim = '{';
+ rdelim = '}';
+ break;
+ case BRACK:
+ ldelim = '[';
+ rdelim = ']';
+ break;
+ }
+ os << "<mo fence='true' stretchy='true' form='prefix'>" << ldelim << "</mo>"
+ << "<mfrac linethickness='0'>"
+ << cell(0) << cell(1)
+ << "</mfrac>"
+ << "<mo fence='true' stretchy='true' form='postfix'>" << rdelim << "</mo>";
+}
+
+
+void InsetMathBinom::htmlize(HtmlStream & os) const
+{
+ char ldelim = ' ';
+ char rdelim = ' ';
+ switch (kind_) {
+ case BINOM:
+ case TBINOM:
+ case DBINOM:
+ case CHOOSE:
+ ldelim = '(';
+ rdelim = ')';
+ break;
+ case BRACE:
+ ldelim = '{';
+ rdelim = '}';
+ break;
+ case BRACK:
+ ldelim = '[';
+ rdelim = ']';
+ break;
+ }
+ os << MTag("span", "class='binomdelim'") << ldelim << ETag("span") << '\n'
+ << MTag("span", "class='binom'") << '\n'
+ << MTag("span") << cell(0) << ETag("span") << '\n'
+ << MTag("span") << cell(1) << ETag("span") << '\n'
+ << ETag("span") << '\n'
+ << MTag("span", "class='binomdelim'") << rdelim << ETag("span") << '\n';
+}
+
+
+void InsetMathBinom::validate(LaTeXFeatures & features) const
+{
+ if (features.runparams().isLaTeX()) {
+ if (kind_ == BINOM)
+ features.require("binom");
+ if (kind_ == DBINOM || kind_ == TBINOM)
+ features.require("amsmath");
+ } else if (features.runparams().math_flavor == OutputParams::MathAsHTML)
+ features.addCSSSnippet(
+ "span.binom{display: inline-block; vertical-align: bottom; text-align:center;}\n"
+ "span.binom span{display: block;}\n"
+ "span.binomdelim{font-size: 2em;}");
+ InsetMathNest::validate(features);
+}
+
} // namespace lyx
projects / lyx.git / blobdiff