Fix #10778 (issue with CJK and language nesting)

[lyx.git] / src / Length.h

diff --git a/src/Length.h b/src/Length.h
index 67073a2bf1d05ee1ab21b9f4b781fbca7442cb7f..2a8f0642108602fb70c8f01195f47fff31e4322d 100644 (file)
--- a/src/Length.h
+++ b/src/Length.h
@@ -5,7 +5,7 @@
  * Licence details can be found in the file COPYING.
  *
  * \author Matthias Ettrich
- * \author Lars Gullik Bjønnes
+ * \author Lars Gullik Bjønnes
  * \author Jean-Marc Lasgouttes
  * \author John Levon
  *
@@ -20,6 +20,8 @@
 
 namespace lyx {
 
+class MetricsBase;
+
 // Solaris/x86 version 9 and earlier define these
 #undef PC
 #undef SP
@@ -38,24 +40,24 @@ class Length {
 public:
        /// length units
        enum UNIT {
-               SP, ///< Scaled point (65536sp = 1pt) TeX's smallest unit.
-               PT, ///< Point = 1/72.27in = 0.351mm
                BP, ///< Big point (72bp = 1in), also PostScript point
-               DD, ///< Didot point = 1/72 of a French inch, = 0.376mm
-               MM, ///< Millimeter = 2.845pt
-               PC, ///< Pica = 12pt = 4.218mm
                CC, ///< Cicero = 12dd = 4.531mm
                CM, ///< Centimeter = 10mm = 2.371pc
-               IN, ///< Inch = 25.4mm = 72.27pt = 6.022pc
-               EX, ///< Height of a small "x" for the current font.
+               DD, ///< Didot point = 1/72 of a French inch, = 0.376mm
                EM, ///< Width of capital "M" in current font.
+               EX, ///< Height of a small "x" for the current font.
+               IN, ///< Inch = 25.4mm = 72.27pt = 6.022pc
+               MM, ///< Millimeter = 2.845pt
                MU, ///< Math unit (18mu = 1em) for positioning in math mode
+               PC, ///< Pica = 12pt = 4.218mm
+               PT, ///< Point = 1/72.27in = 0.351mm
+               SP, ///< Scaled point (65536sp = 1pt) TeX's smallest unit.
                PTW, //< Percent of TextWidth
                PCW, //< Percent of ColumnWidth
                PPW, //< Percent of PageWidth
                PLW, //< Percent of LineWidth
-               PTH, //< Percent of TextHeight          // Herbert 2002-05-16
-               PPH, //< Percent of PaperHeight         // Herbert 2002-05-16
+               PTH, //< Percent of TextHeight          // Herbert 2002-05-16
+               PPH, //< Percent of PaperHeight         // Herbert 2002-05-16
                UNIT_NONE ///< no unit
        };
 
@@ -67,8 +69,6 @@ public:
        /// "data" must be a decimal number, followed by a unit
        explicit Length(std::string const & data);
 
-       ///
-       void swap(Length & rhs);
        ///
        double value() const;
        ///
@@ -87,14 +87,32 @@ public:
        docstring const asDocstring() const;
        /// return string representation for LaTeX
        std::string const asLatexString() const;
-       /// return the on-screen size of this length
+       /// return string representation for HTML
+       std::string const asHTMLString() const;
+       /** return the on-screen size of this length.
+        *
+        *      If the second argument is not provided, then the unit EM will
+        *      only be approximated. It is better if possible to use
+        *      FontMetrics::em() to get this value.
+        */
        int inPixels(int text_width, int em_width = 0) const;
+       /** return the on-screen size of this length
+        *
+        *  This version of the function uses the right EM definition.
+        */
+       int inPixels(MetricsBase const &) const;
        /// return the value in Big Postscript points.
+       /// Caution: Inaccurate for em, ex, mu and percent units.
        int inBP() const;
 
+       /// return the default unit (centimeter or inch)
+       static UNIT defaultUnit();
+
        friend bool isValidLength(std::string const & data, Length * result);
 
 private:
+       /// Convert value to inch for text width and em width given in inch
+       double inInch(double text_width, double em_width) const;
        ///
        double val_;
        ///