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Datei: vspace.h Sprache: C

Original von: Lyx^©

// -*- C++ -*-
/* This file is part of
* ======================================================
*
*           LyX, The Document Processor
*
*     Copyright (C) 1995 1996 Matthias Ettrich
*           and the LyX Team.
*
*======================================================*/

#ifndef _VSPACE_H_
#define _VSPACE_H_

#ifdef __GNUG__
#pragma interface
#endif

#include <stdio.h>

///  LyXLength Class
class LyXLength {
public:
/// length units
enum UNIT {
  /// Scaled point (65536sp = 1pt) TeX's smallest unit.
  SP,
  /// Point = 1/72.27in = 0.351mm
  PT,
  /// Big point (72bp = 1in), also PostScript point
  BP,
  /// Didot point = 1/72 of a French inch, = 0.376mm
  DD,
  /// Millimeter = 2.845pt
  MM,
  /// Pica = 12pt = 4.218mm
  PC,
  /// Cicero = 12dd = 4.531mm
  CC,
  /// Centimeter = 10mm = 2.371pc
  CM,
  /// Inch = 25.4mm = 72.27pt = 6.022pc
  IN,
  /// Height of a small "x" for the current font.
  EX,
  /// Width of capital "M" in current font.
  EM,
  /// Math unit (18mu = 1em) for positioning in math mode
  MU,
  /// no unit
  UNIT_NONE
};

//@Man: constructors
//@{
///
LyXLength() : val(0), uni(LyXLength::PT) {};
LyXLength(float v, LyXLength::UNIT u) : val(v), uni(u) {};

/** "data" must be a decimal number, followed by a unit. */
        LyXLength(LString const & data);
//@}

//@Man: selectors
//@{
///
float value() const         { return val; };
///
LyXLength::UNIT unit() const { return uni; };
//@}

///
        bool operator==(LyXLength other);

/// conversion
virtual LString asString() const;
virtual LString asLatexString() const { return this->asString(); };

/** If "data" is valid, the length represented by it is
  stored into "result", if that is not NULL. */
friend bool isValidLength(LString const & data,
      LyXLength* result=NULL);

protected:
float           val;
LyXLength::UNIT uni;
};

extern LyXLength::UNIT unitFromString (LString const & data);
extern bool isValidLength(LString const &data, LyXLength* result);

/// LyXGlueLength class
class LyXGlueLength : public LyXLength {
public:
//@Man: constructors
//@{
///
LyXGlueLength(float v,      LyXLength::UNIT u,
        float pv=0.0, LyXLength::UNIT pu=LyXLength::UNIT_NONE,
        float mv=0.0, LyXLength::UNIT mu=LyXLength::UNIT_NONE)
  : LyXLength (v, u),
    plus_val(pv), minus_val(mv),
    plus_uni(pu), minus_uni(mu) {};

/** "data" must be a decimal number, followed by a unit, and
  optional "glue" indicated by "+" and "-".  You may abbreviate
  reasonably.  Examples:
  1.2 cm  //  4mm +2pt  //  2cm -4mm +2mm  //  4+0.1-0.2cm
  The traditional Latex format is also accepted, like
  4cm plus 10pt minus 10pt */
        LyXGlueLength(LString const & data);
//@}

//@Man: selectors
//@{
///
float plusValue() const         { return plus_val; };
///
LyXLength::UNIT plusUnit() const { return plus_uni; };
///
float minusValue() const         { return minus_val; };
///
LyXLength::UNIT minusUnit() const { return minus_uni; };
//@}

///
        bool operator==(LyXGlueLength other);

/// conversion
virtual LString asString() const;
virtual LString asLatexString() const;

/** If "data" is valid, the length represented by it is
  stored into "result", if that is not NULL. */
friend bool isValidGlueLength(LString const & data,
          LyXGlueLength* result=NULL);

protected:
float           plus_val, minus_val;
LyXLength::UNIT plus_uni, minus_uni;
};

extern bool isValidGlueLength(LString const &data, LyXGlueLength* result);

///  VSpace class
class VSpace {
public:
///
enum vspace_kind { NONE, DEFSKIP,
      SMALLSKIP, MEDSKIP, BIGSKIP,
      VFILL, LENGTH };
// constructors
VSpace() :
  kin (NONE),
  len(0.0, LyXLength::PT),
                kp (false) {};

VSpace(vspace_kind k) :
  kin (k),
  len (0.0, LyXLength::PT),
         kp (false) {};

VSpace(LyXGlueLength l) :
  kin (LENGTH),
  len (l),
         kp (false) {};

VSpace(float v, LyXLength::UNIT u) :
  kin (LENGTH),
  len (v, u),
         kp (false) {};

/// this constructor is for reading from a .lyx file
VSpace(LString const & data);

// access functions
vspace_kind kind() const  { return  kin; }
LyXLength   length() const { return len; }

// a flag that switches between \vspace and \vspace*
        bool keep() const      { return kp; }
void setKeep(bool val) { kp = val; }

        bool operator== (VSpace other);

// conversion
LString asLyXCommand() const;  // how it goes into the LyX file
LString asLatexCommand() const;
int inPixels() const;
private:
vspace_kind  kin;
LyXGlueLength    len;
bool kp;
};

#endif

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