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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15459 a592a061-630c-0410-9148-cb99ea01b6c8
125 lines
3.3 KiB
C++
125 lines
3.3 KiB
C++
// -*- C++ -*-
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/**
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* \file lyxlength.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Matthias Ettrich
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* \author Lars Gullik Bjønnes
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* \author Jean-Marc Lasgouttes
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* \author John Levon
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*
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* Full author contact details are available in file CREDITS.
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*/
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#ifndef LYX_LENGTH_H
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#define LYX_LENGTH_H
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#include "support/docstring.h"
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#include <string>
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namespace lyx {
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// Solaris/x86 version 9 and earlier define these
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#undef PC
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#undef SP
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/**
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* LyXLength - Represents latex length measurement
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*/
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class LyXLength {
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public:
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/// length units
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enum UNIT {
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SP, ///< Scaled point (65536sp = 1pt) TeX's smallest unit.
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PT, ///< Point = 1/72.27in = 0.351mm
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BP, ///< Big point (72bp = 1in), also PostScript point
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DD, ///< Didot point = 1/72 of a French inch, = 0.376mm
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MM, ///< Millimeter = 2.845pt
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PC, ///< Pica = 12pt = 4.218mm
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CC, ///< Cicero = 12dd = 4.531mm
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CM, ///< Centimeter = 10mm = 2.371pc
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IN, ///< Inch = 25.4mm = 72.27pt = 6.022pc
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EX, ///< Height of a small "x" for the current font.
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EM, ///< Width of capital "M" in current font.
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MU, ///< Math unit (18mu = 1em) for positioning in math mode
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PTW, //< Percent of TextWidth
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PCW, //< Percent of ColumnWidth
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PPW, //< Percent of PageWidth
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PLW, //< Percent of LineWidth
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PTH, //< Percent of TextHeight // Herbert 2002-05-16
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PPH, //< Percent of PaperHeight // Herbert 2002-05-16
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UNIT_NONE ///< no unit
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};
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///
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LyXLength();
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///
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LyXLength(double v, LyXLength::UNIT u);
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/// "data" must be a decimal number, followed by a unit
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explicit LyXLength(std::string const & data);
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void swap(LyXLength & rhs)
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{
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std::swap(val_, rhs.val_);
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std::swap(unit_, rhs.unit_);
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}
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///
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double value() const;
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///
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LyXLength::UNIT unit() const;
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///
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void value(double);
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///
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void unit(LyXLength::UNIT unit);
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///
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bool zero() const;
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///
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bool empty() const;
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/// return string representation
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std::string const asString() const;
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/// return string representation
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docstring const asDocstring() const;
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/// return string representation for LaTeX
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std::string const asLatexString() const;
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/// return the on-screen size of this length
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int inPixels(int text_width, int em_width = 0) const;
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/// return the on-screen size of this length of an image
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int inBP() const;
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friend bool isValidLength(std::string const & data, LyXLength * result);
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private:
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///
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double val_;
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///
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LyXLength::UNIT unit_;
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};
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///
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bool operator==(LyXLength const & l1, LyXLength const & l2);
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///
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bool operator!=(LyXLength const & l1, LyXLength const & l2);
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/** Test whether \p data represents a valid length.
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*
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* \returns whether \p data is a valid length
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* \param data Length in LyX format. Since the only difference between LyX
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* and LaTeX format is the representation of length variables as units (e.g.
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* \c text% vs. \c \\textwidth) you can actually use this function as well
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* for testing LaTeX lengths as long as they only contain real units like pt.
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* \param result Pointer to a LyXLength variable. If \p result is not 0 and
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* \p data is valid, the length represented by it is stored into \p result.
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*/
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bool isValidLength(std::string const & data, LyXLength * result = 0);
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/// return the LyX name of the given unit number
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char const * stringFromUnit(int unit);
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} // namespace lyx
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#endif // LYXLENGTH_H
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