Add support for amsmath's smallmatrix

This is a tight matrix in script size that is suitable for using inline.

Patch from our own Martin Vermeer and myself.

src/LyXAction.cpp

@@ -2602,7 +2602,7 @@ void LyXAction::init()
  * \li Syntax: math-matrix <COLS> <ROWS> [<DECORATION>]
  * \li Params: <DECORATION>: Decoration determines the LaTeX name of the matrix
                              that should be created. Possible values include
-                             pmatrix, bmatrix, Bmatrix, vmatrix, Vmatrix and
+                             pmatrix, bmatrix, Bmatrix, vmatrix, Vmatrix, smallmatrix, and
                              matrix. The default is 'matrix'.
  * \li Sample: math-ams-matrix 3 3 bmatrix
  * \endvar

src/MetricsInfo.cpp

@@ -221,8 +221,10 @@ Changer MetricsBase::changeFrac()
 }
 
 
-Changer MetricsBase::changeArray()
+Changer MetricsBase::changeArray(bool small)
 {
+	if (small)
+		return font.changeStyle(SCRIPT_STYLE);
 	return (font.style() == DISPLAY_STYLE) ? font.changeStyle(TEXT_STYLE)
 		: Changer();
 }

src/MetricsInfo.h

@@ -61,7 +61,8 @@ public:
 	// Temporarily change to the style suitable for use in fractions
 	Changer changeFrac();
 	// Temporarily change to the style suitable for use in arrays
-	Changer changeArray();
+	// or to style suitable for smallmatrix when \c small is true.
+	Changer changeArray(bool small = false);
 	// Temporarily change the style to (script)script style
 	Changer changeScript();
 	///

src/frontends/qt4/GuiMathMatrix.cpp

@@ -36,6 +36,7 @@ static char const * const DecoChars[] = {
 	N_("{x}"),
 	N_("|x|"),
 	N_("||x||"),
+	N_("small"),
 	""
 };
 
@@ -45,6 +46,7 @@ static char const * const DecoNames[] = {
 	N_("Bmatrix"),
 	N_("vmatrix"),
 	N_("Vmatrix"),
+	N_("smallmatrix"),
 	""
 };
 

src/frontends/qt4/ui/MathMatrixUi.ui

@@ -228,7 +228,7 @@
    <item row="3" column="2">
     <widget class="QGroupBox" name="decorationtGB">
      <property name="title">
-      <string>Decoration</string>
+      <string>Appearance</string>
      </property>
      <property name="flat">
       <bool>true</bool>

src/mathed/InsetMathAMSArray.cpp

@@ -83,10 +83,28 @@ char const * InsetMathAMSArray::name_right() const
 }
 
 
+int InsetMathAMSArray::rowsep() const
+{
+	return small() ? 0 : InsetMathGrid::rowsep();
+}
+
+
+int InsetMathAMSArray::colsep() const
+{
+	return small() ? InsetMathGrid::colsep() / 2 : InsetMathGrid::colsep();
+}
+
+
+int InsetMathAMSArray::border() const
+{
+	return small() ? 0 : InsetMathGrid::border();
+}
+
+
 void InsetMathAMSArray::metrics(MetricsInfo & mi, Dimension & dim) const
 {
 	Changer dummy2 = mi.base.changeEnsureMath();
-	Changer dummy = mi.base.changeArray();
+	Changer dummy = mi.base.changeArray(small());
 	InsetMathGrid::metrics(mi, dim);
 }
 
@@ -94,12 +112,14 @@ void InsetMathAMSArray::metrics(MetricsInfo & mi, Dimension & dim) const
 void InsetMathAMSArray::draw(PainterInfo & pi, int x, int y) const
 {
 	Changer dummy2 = pi.base.changeEnsureMath();
-	Dimension const dim = dimension(*pi.base.bv);
-	int const yy = y - dim.ascent();
-	// Drawing the deco after changeStyle does not work
-	mathed_draw_deco(pi, x + 1, yy, 5, dim.height(), from_ascii(name_left()));
-	mathed_draw_deco(pi, x + dim.width() - 8, yy, 5, dim.height(), from_ascii(name_right()));
-	Changer dummy = pi.base.changeArray();
+	if (name_ != "smallmatrix") {
+		Dimension const dim = dimension(*pi.base.bv);
+		int const yy = y - dim.ascent();
+		// Drawing the deco after changeStyle does not work
+		mathed_draw_deco(pi, x + 1, yy, 5, dim.height(), from_ascii(name_left()));
+		mathed_draw_deco(pi, x + dim.width() - 8, yy, 5, dim.height(), from_ascii(name_right()));
+	}
+	Changer dummy = pi.base.changeArray(small());
 	InsetMathGrid::draw(pi, x, y);
 }
 

src/mathed/InsetMathAMSArray.h

@@ -23,7 +23,14 @@ public:
 	///
 	InsetMathAMSArray(Buffer * buf, docstring const &, int m, int n);
 	///
-	InsetMathAMSArray(Buffer * buf, docstring const &);
+	InsetMathAMSArray(Buffer * buf, docstring const &);	///
+
+	///
+	int rowsep() const;
+	///
+	int colsep() const;
+	///
+	int border() const;
 	///
 	void metrics(MetricsInfo & mi, Dimension & dim) const;
 	///
@@ -55,15 +62,17 @@ public:
 	///
 	char const * name_right() const;
 	///
-	int leftMargin() const { return 6; } //override
+	int leftMargin() const { return small() ? 3 : 6; } //override
 	///
-	int rightMargin() const { return 8; } //override
+	int rightMargin() const { return small() ? 3: 6; } //override
 	///
 	bool handlesMulticolumn() const { return true; } //override
 
 private:
 	virtual Inset * clone() const;
 	///
+	bool small() const { return name_ == "smallmatrix"; }
+	///
 	docstring name_;
 };
 

src/mathed/InsetMathNest.cpp

@@ -1091,7 +1091,8 @@ void InsetMathNest::doDispatch(Cursor & cur, FuncRequest & cmd)
 		// check if we have a valid decoration
 		if (name != "pmatrix" && name != "bmatrix"
 			&& name != "Bmatrix" && name != "vmatrix"
-			&& name != "Vmatrix" && name != "matrix")
+			&& name != "Vmatrix" && name != "matrix"
+			&& name != "smallmatrix")
 			name = from_ascii("matrix");
 
 		cur.niceInsert(