gls_text.h

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/*! \file
  \brief  The disti::GlsText class.

  \par Copyright Information

  Copyright (c) 2017 by The DiSTI Corporation.<br>
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  <br>
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  NO WARRANTY. THE SOFTWARE IS PROVIDED "AS-IS," WITHOUT WARRANTY OF ANY KIND,
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*/

#ifndef _GLS_TEXT_H
#define _GLS_TEXT_H

#include "unhide_globals.h"

#include "gls_gl.h"
#include <string>

#include "glpolygon.h"
#include "gls_color.h"
#include "gls_cpp_lang_support.h"
#include "gls_font_base.h"
#include "gls_font_man.h"
#include "gls_metadata_attributes.h"
#include "gls_runtime_font_base.h"
#include "gls_unicode_font_base.h"
#include "scoped_ptr.h"

//===========================================================================
//                             MACROS
//===========================================================================
#ifdef GLES
#    define GLS_TEXT_SET_GEOMETRY_REFRESH GeometryRefresh();
#else
#    define GLS_TEXT_SET_GEOMETRY_REFRESH
#endif

#define SET_ALL_CHARS( attribute, value )                                          \
    {                                                                              \
        for( CharAttrCont_t::iterator i = _chars.begin(); i != _chars.end(); ++i ) \
        {                                                                          \
            i->attribute = value;                                                  \
        }                                                                          \
        GLS_TEXT_SET_GEOMETRY_REFRESH                                              \
    }

//===========================================================================
//                         BEGIN NAMESPACE
//===========================================================================
namespace disti
{
#ifdef GLES
// Forward Declaration
class GlsGloFileAttribute;
#endif

// Forward Declaration
class RuntimeGlyphGenerationText;

// Initializers for text
typedef enum
{
    GLS_TEXT_BORDER = GLS_LAST_INITIALIZER + 1,
    GLS_TEXT_CELL_HEIGHT,
    GLS_TEXT_CELL_WIDTH,
    GLS_TEXT_CONSTRAIN_CELL_RATIO,
    GLS_TEXT_CONTROL_CELL_SIZE,
    GLS_TEXT_FONT,
    GLS_TEXT_HALO,
    GLS_TEXT_LINESPACING,
    GLS_TEXT_LOCK_CELL_SIZE,
    GLS_TEXT_JUSTIFY,
    GLS_TEXT_SHADOW,
    GLS_TEXT_STRING,
    GLS_TEXT_UPPERCASE,
    GLS_TEXT_WRAP,
    GLS_LAST_TEXT_INITIALIZER = GLS_TEXT_WRAP
} GlsTextInitializers_t;

/** helper method for safely getting a runtime font base from a font base (if possible)
  * \param font font in question
  * \return runtime font else NULL
  */
inline GlsRuntimeFontBase* GetGlsRuntimeFontBase( const GlsFontBase* font )
{
    GlsRuntimeFontBase* rtf = NULL;
    if( font )
    {
        // determine if font can be safely cast to a runtime font by inspecting the family name
        if( 0 == font->Family().find( GLS_RUNTIME_FONT_NAME_PREFIX ) )
        {
            rtf = static_cast<GlsRuntimeFontBase*>( (GlsFontBase*)font );
        }
    }
    return ( rtf );
}

/** helper method for safely getting a unicode font base from a font base (if possible)
  * \param font font in question
  * \return unicode font else NULL
  */
inline const GlsUnicodeFontBase* GetGlsUnicodeFontBase( const GlsFontBase* font )
{
    const GlsUnicodeFontBase* unf = NULL;
    if( font )
    {
        // determine if font can be safely cast to a unicode font by inspecting the family name
        if( 0 == font->Family().find( GLS_UNICODE_FONT_NAME_PREFIX ) )
        {
            unf = static_cast<const GlsUnicodeFontBase*>( font );
        }
    }
    return ( unf );
}

//===========================================================================
/**
* The GlsText class provides a base class for all GLStudio text components.
*/
//===========================================================================
class GlsText : public GLPolygon
{
public:
    DISTI_DEPRECATED( "This identifier is forbidden by the C++ standard. Use BaseClass instead." )
    typedef GLPolygon _BaseClass;
    typedef GLPolygon BaseClass;

    typedef GlsFontBase::Char_t Char_t;

    // Carriage return (end of line) character
    static GLS_EXPORT const Char_t EOL;

    enum
    {
        NUM_VERTICES = 4
    };

    /// Different text justifications.
    enum Justify_t
    {
        LEFT,
        CENTER,
        RIGHT
    };

    /// Attributes for each character position in the grid.
    struct CharAttr_t
    {
        Char_t   code;
        float    baselineShift;
        GlsColor bgColor;
        GlsColor fgColor;
        bool     fauxBold;
        bool     inverse;
        float    scale;
        float    spacing;
        bool     strikeThru;
        bool     underline;

        //----------------------------------------------------------------------
        GLS_EXPORT CharAttr_t();

        //----------------------------------------------------------------------
        GLS_EXPORT CharAttr_t( const CharAttr_t& r );

        //----------------------------------------------------------------------
        GLS_EXPORT void Clear();

        //----------------------------------------------------------------------
        GLS_EXPORT CharAttr_t& operator=( const CharAttr_t& r );
    };

    /** Class Constructor. */
    GLS_EXPORT GlsText();
    GLS_EXPORT GlsText( const GlsText& that, const bool generateNames );

    /** Class Constructor. */
    GLS_EXPORT virtual ~GlsText();

    virtual GLS_EXPORT void SetAvailableAttributes( unsigned int value ) DISTI_METHOD_OVERRIDE;

    /** Sets the baseline shift for all characters.
      * \param baselineShift  multiplier used to shift the baseline. This will
      *                       be multiplied by the character height to 
      *                       determine how much to shift. A value of 0 does
      *                       not shift at all, a value of 1 will shift up
      *                       by the height of 1 character.
      */
    GLS_EXPORT void Baseline( const float& baselineShift );

    /** Gets the baseline shift for the first character
      */
    GLS_EXPORT float Baseline();

    /** Sets the background color for all characters
      * \param color  The background color to set
      */
    GLS_EXPORT void BgColor( const GlsColor& color );

    /** Gets the background color for the first character
      */
    GLS_EXPORT GlsColor BgColor();

    /** Sets the spacing between the box outline and the text in logical units.
      * \param units  Border offset value in logical units
      */
    GLS_EXPORT void Border( const float& units );

    /** Sets the spacing between the box outline and the text in logical units.
      */
    float Border() const
    {
        return _border;
    }

    /** Sets the height of a character cell of the grid in logical units 
      * when stretch to fit mode is in effect.  When stretch to fit mode
      * is not in effect, this call will not affect the grid since the
      * font determines the cell size.
      * \param height the new character cell height.
      */
    GLS_EXPORT void CellHeight( float height );

    /** \return the height of a char cell of the grid in logical units.
      */
    float CellHeight() const
    {
        return _cellHeight;
    }

    /** Sets the width of a character cell of the grid in logical units 
      * when stretch to fit mode is in effect. When stretch to fit mode
      * is not in effect, this call will not affect the grid since the
      * font determines the cell size.
      * \param width the new character cell width.
      */
    GLS_EXPORT void CellWidth( float width );

    /** \return the width of a char cell of the grid in logical units. */
    float CellWidth() const
    {
        return _cellWidth;
    }

    /** Sets the character code for all cell positions in the text grid
      * \param code  The Unicode character code to set
      */
    GLS_EXPORT void Char( Char_t code );

    /** Accessor method used by metadata to read and write the character attributes
      * for this object.  Currently only allows you to load and save attributes for the
      * entire object, not on a per character basis.
      * \return  The character attribute for the first character in the object and therefore
      *          for every character in the object
      */
    CharAttr_t CharAttribs() const
    {
        return _chars[ 0 ];
    }

    /** \return a particular cell's character attributes. */
    CharAttr_t CharAttr( unsigned int index ) const
    {
        return _chars[ index < _chars.size() ? index : 0 ];
    }

    /** Sets the scale factor of all characters  NOTE:  This is the size of the character in its
      * cell not the overall scale of the entire object
      * \param newScale  The new scale factor of the characters (0.0 < newScale <= 1.0)
      */
    GLS_EXPORT void CharScaling( const float& newScale );

    /** Gets the scale factor of the first character
      */
    GLS_EXPORT float CharScaling();

    /** Sets the horizontal character spacing for all characters (spacing 
      * from the start of one character to the start of the next character.
      * 1.0 is the default spacing 2.0 would be twice the normal spacing
      * \param horizontalSpacing  The horizontalSpacing value
      */
    GLS_EXPORT void CharSpacing( const float& horizontalSpacing );

    /** Gets the horizontal character spacing for the first character
      */
    GLS_EXPORT float CharSpacing();

    /** Sets whether to constrain cell width and height proportions when
      * in stretch to fit mode and changing the size of character cells.
      * \param constrain true to constrain proportions.
      */
    GLS_EXPORT void ConstrainCellRatio( bool constrain );

    /** \return whether to constrain cell width and height proportions when
      * in stretch to fit mode and changing the size of character cells.
      */
    bool ConstrainCellRatio() const
    {
        return _constrainRatio;
    }

    /** Sets whether or not the character cell size will stretch to fit 
      * this object's bounding box or if it is based on its font and font.
      * \param control  True if stretch to fit will be enabled
      */
    GLS_EXPORT void ControlCellSize( bool control );

    /** \return whether or not the character cell size will stretch to fit 
      * this object's bounding box or if it is based on its font and font 
      */
    bool ControlCellSize() const
    {
        return _controlCellSize;
    }

    /* See base class */
    GLS_EXPORT virtual void CopyGeometry( DisplayObject* src ) DISTI_METHOD_OVERRIDE;

    /* See base class */
    GLS_EXPORT virtual void CopyProperties( DisplayObject* src ) DISTI_METHOD_OVERRIDE;

    /** Erase all characters. */
    GLS_EXPORT void Erase();

    /** Set the bold state on or off for all characters
      * \param bold  Bold state
      */
    GLS_EXPORT void FauxBold( const bool& bold );

    /** Gets the bold state on or off for the first character
      */
    GLS_EXPORT bool FauxBold();

    /** \return The font currently being used to render this text.
      */
    GlsFontBase* Font() const
    {
        return _font;
    }

    /** Set the font used to render this text.
      * \param font  Pointer to a font instance to set
      */
    GLS_EXPORT void Font( GlsFontBase* font );

#ifndef GLES
    /* See base class */
    virtual GLS_EXPORT InterfaceListType* GetCppInterfaceDescription( InterfaceListType* addToThisList = NULL ) DISTI_METHOD_OVERRIDE;

    /* See base class */
    virtual GLS_EXPORT void GetCppInterfaceDescriptionFree( InterfaceListType* array ) DISTI_METHOD_OVERRIDE;
#endif

    /** Set the halo state to on or off for the text
      * \param halo  halo state
      */
    GLS_EXPORT void Halo( bool halo );

    bool Halo() const
    {
        return _halo;
    }

    /** Set the color of the halo around the text
      * \param color  halo color
      */
    GLS_EXPORT void HaloColor( const GlsColor& color );

    GlsColor HaloColor() const
    {
        return _haloColor;
    }

    /** Invalidates the font for this object.  If the font is invalidated, this object will
      * draw using the default font.  This is used in the editor and should not need to
      * be called by any user code at run-time.
      */
    GLS_EXPORT void InvalidateFont();

    /** Set the inverse video state on or off for all characters
      * \param inverse  inverse video state
      */
    GLS_EXPORT void Inverse( const bool& inverse );

    /** Gets the inverse video state on or off for the first character
      */
    GLS_EXPORT bool Inverse();

    /** Set the justification mode for this text object
      * \param justification The justification mode (LEFT, RIGHT, CENTER)
      */
    GLS_EXPORT void Justify( Justify_t justification );

    /** \return the justification mode (LEFT, RIGHT, CENTER)*/
    Justify_t Justify() const
    {
        return _justify;
    }

    /** Sets the linespacing for the text object.  A line spacing of 1.0 indicates normal
      * "single spaced" text.  2.0 would be double spaced, etc.
      * \param spacing  The new linespacing value
      */
    GLS_EXPORT void LineSpacing( float spacing );

    /** \return the linespacing for the text object. */
    float LineSpacing() const
    {
        return _lineSpacing;
    }

    /** Sets whether or not the cell size is locked while in stretch to fit
      * mode. If locked, changing other attributes will not affect the
      * cell size, but the box size instead.  If not locked, changing
      * certain attributes, eg. border, will affect the cell size.
      * \param lock  true to lock cell size, false otherwise
      */
    GLS_EXPORT void LockCellSize( bool lock );

    /** \return the setting of lock cell size. */
    bool LockCellSize() const
    {
        return _lockCellSize;
    }

#if !defined( GCC_2_95 )
    /* Unhides base class implementation. */
    using BaseClass::Rotate;
#endif

    /* See base class */
    virtual GLS_EXPORT void Rotate( const Vector& orig, float angle, const Vector& axis ) DISTI_METHOD_OVERRIDE;

    /* See base class */
    virtual GLS_EXPORT void SetValue( int spec, va_list& args ) DISTI_METHOD_OVERRIDE;

#ifdef GLES
    /** Set a single attribute from the GLO file.
     * \param data The attribute to set and its associated data.
     */
    virtual GLS_EXPORT void SetFromGloData( GlsGloFileAttribute& data ) DISTI_METHOD_OVERRIDE;
#endif

    /** Set the shadow state to on or off for the text
      * \param shadow  shadow state
      */
    GLS_EXPORT void Shadow( bool shadow );

    bool Shadow() const
    {
        return _shadow;
    }

    /** Set the color of the shadow behind the text
      * \param color  shadow color
      */
    GLS_EXPORT void ShadowColor( const GlsColor& color );

    GlsColor ShadowColor() const
    {
        return _shadowColor;
    }

    /** Set the distance of the shadow from the text. Distance represent a percentage of the character
     * width. Negative values are up and to the left. Positive values are down and to the right.  Note that the
     * corresponding getter was removed because ShadowDistance is deprecated in favor of ShadowOffset.
     * \param dist  shadow distance
     */
    void ShadowDistance( const float& dist )
    {
        ShadowOffset( Vector( dist, -dist, 0.0f ) );
    }

    /** Set the Cartesian offset of the shadow from the text. Offset represent a percentage of the character
     * width. Negative values are down and to the left. Positive values are up and to the right.
     * Z component is ignored.
     * \param offset  shadow offset
     */
    GLS_EXPORT void ShadowOffset( const Vector& offset );

    Vector ShadowOffset()
    {
        return _shadowOffset;
    }

    /** Sets the strikethru state for all characters
      * \param strike Whether or not set strikethru
      */
    GLS_EXPORT void StrikeThru( const bool& strike );

    /** Gets the strikethru state for the first character
      */
    GLS_EXPORT bool StrikeThru();

    /** Sets the Unicode string to be displayed for this object
      * \param s STD Template Library String
      */
    virtual GLS_EXPORT void String( const std::string& s );

    /** Sets the Unicode string to be displayed for this object
      * \param s C Style string
      */
    virtual void String( const char* s )
    {
        String( std::string( s ) );
    }

    /** \return The string currently stored in this object.
      *         NOTE: This can contain extra characters not being displayed
      *               in the grid if the string size is greater than will 
      *               fit within the grid.  
    */
    std::string String() const
    {
        return _text;
    }

    /** Sets the foreground color for all characters in the text grid.
      * \param color  The foreground color to set
      */
    GLS_EXPORT void TextColor( const GlsColor& color );

    /** Gets the foreground color for the first character in the text grid.
      */
    GLS_EXPORT GlsColor TextColor();

    /** Turns on/off underlines for all characters
      * \param underline  Whether or not to enable underline
      */
    GLS_EXPORT void Underline( const bool& underline );

    /** Gets the on/off state of underline for the first character
      */
    GLS_EXPORT bool Underline();

    /** Makes all characters uppercase when rendered.
      * \param uppercase  Whether or not to enable uppercase
      */
    GLS_EXPORT void Uppercase( bool uppercase );
    bool            Uppercase() const
    {
        return _uppercase;
    }

    /** Enable/disable word wrap behavior for this object
      * \param wrap  Whether or not to enable word wrap
      */
    GLS_EXPORT void WrapText( bool wrap );

    /** \return current word wrap behavior for this object */
    bool WrapText() const
    {
        return _wrapText;
    }

    /** Sets the rebuild flag, which forces the text object to rebuild itself on the next call to Calculate, PreDraw, or Draw. */
    void SetRebuild()
    {
        _needToRebuild = true;
        InvalidatePainter();
    }

    /** whether or not this text object requires a font file to work.  If this returns true, the text object may not work with the generated ASCII / UNICODE font types */
    virtual bool RequiresFontFile() const
    {
        return false;
    }

public: // protected is prefered, but VC 7.0 has issues with it.
    /** Line Segment_t */
    class LineSegment_t
    {
    public:
        float    x1;
        float    x2;
        float    y;
        float    thickness;
        float    shadowOffsetX;
        float    shadowOffsetY;
        GlsColor color;

        LineSegment_t()
            : x1( 0.0f )
            , x2( 0.0f )
            , y( 0.0f )
            , thickness( 0.0f )
            , shadowOffsetX( 0.0f )
            , shadowOffsetY( 0.0f )
        {
        }

        LineSegment_t(
            const float     segmentX1,
            const float     segmentX2,
            const float     segmentY,
            const float     segmentThickness,
            const float     segmentShadowOffsetX,
            const float     segmentShadowOffsetY,
            const GlsColor& segmentColor )
            : x1( segmentX1 )
            , x2( segmentX2 )
            , y( segmentY )
            , thickness( segmentThickness )
            , shadowOffsetX( segmentShadowOffsetX )
            , shadowOffsetY( segmentShadowOffsetY )
            , color( segmentColor )
        {
        }
    };

protected:
    typedef std::vector<CharAttr_t> CharAttrCont_t;

    static GLS_EXPORT const Vector XAXIS;
    static GLS_EXPORT const Vector YAXIS;

    static GLS_EXPORT Vertex INITIAL_VERTICES[ NUM_VERTICES ];

    /** The border offset in logical units for this object. 
      * Defines the size of the empty space between the outline of the box
      * and its text 
      */
    float _border;

    /** Container of character attributes */
    CharAttrCont_t _chars;

    Vertex _currentVertices[ NUM_VERTICES ];

    /** Height of each character cell in the grid in logical units */
    float _cellHeight;

    /** Width of each character cell in the grid in logical units */
    float _cellWidth;

    /** Only effective when _controlCellSize is true. Whether or not to 
     * constrain cell size ratio when changing cell height or width. 
     */
    bool _constrainRatio;

    /** If true, font size does not control cell size */
    bool _controlCellSize;

    /** Current font being used for the text */
    GlsFontBase* _font;

    /* Whether or not the halo effect is on. */
    bool _halo;

    /** Color of the halo effect behind the characters */
    GlsColor _haloColor;

    /** Justification setting (LEFT, RIGHT, CENTER) */
    Justify_t _justify;

    /** Line spacing between grid rows as a percentage */
    float _lineSpacing;

    /** Only effective when _controlCellSize is true. If true, changes to
      * rows, columns, border, line spacing, column spacing, etc. will
      * not change the cell size. Normally, when _controlCellSize is true
      * these attributes affect the cell size.
      */
    bool _lockCellSize;

    /** This is set to true whenever an attribute changes that will affect
      * the size of the grid or its cells.  
      */
    bool _needToRebuild;

    /* Whether or not the shadow effect is on. */
    bool _shadow;

    /** Color of the shadow effect behind the characters */
    GlsColor _shadowColor;

    /** Offset of the shadow effect from the characters.  Z component is ignored. */
    Vector _shadowOffset;

    /** String of text to be displayed. */
    std::string _text;

    /** If true, all characters will be displayed in uppercase */
    bool _uppercase;

    /** Direction vector indicating direction of horizontal travel for rendering */
    Vector _vX;

    /** Direction vector indicating direction of vertical travel for rendering */
    Vector _vY;

    /** Normal to the Vx Vy plane */
    Vector _vZ;

    /** Whether or not to word wrap text */
    bool _wrapText;

    //-----------------------------------------------------------------------
    /** 
    * Draw a line by rendering a filled polygon with a line around it so that
    * the thickness scales and anti-aliasing will work if enabled.
    */
    //-----------------------------------------------------------------------
public: // protected is preferred, but VC 7.0 has issues with it.
#ifndef GLES
    static void DrawScalableLine(
        GLfloat x1,  // Left point
        GLfloat y1,  // Top point
        GLfloat x2,  // Right Point
        GLfloat y2 ) // Bottom Point
    {
        // APR: The Text Objects send x1,y1 as TOP-RIGHT. Rewrote glVertex calls to support CCW drawing.
        glBegin( GL_POLYGON );
        glVertex2f( x1, y1 );
        glVertex2f( x1, y2 );
        glVertex2f( x2, y2 );
        glVertex2f( x2, y1 );
        glEnd();
        /*
        glBegin(GL_LINE_LOOP);
            glVertex2f(x1, y1);
            glVertex2f(x2, y1);
            glVertex2f(x2, y2);
            glVertex2f(x1, y2);
        glEnd();
        */
    }
#endif
protected:
    /**
     * Allocate a text buffer of the appropriate size for this grid and output snprintf style format 
     *  into the buffer 
     * \param format snprintf style format spec
     * \param args arguments for sprintf style formatting
     * \param initialBufferLength the length of the initial character buffer
     * \return formatted textbuffer ( must be deleted by caller )
     */
    GLS_EXPORT char* FormatVarArgList( const int initialBufferLength, const char* format, va_list args );

    //-----------------------------------------------------------------------
    /**
    */
    //-----------------------------------------------------------------------
    GLS_EXPORT void RecalcDirectionVectors();

    /** Pointer to the internal data needed for runtime glyph generation. */
    ScopedPtr<RuntimeGlyphGenerationText> _runtimeGlyphGenerationText;

private:
    // Allow derived classes to perform a custom action when cell height/width changes.
    virtual GLS_EXPORT void OnCellDimensionChanged()
    {}

    // Disable copying.
    GlsText( const GlsText& ) DISTI_SPECIAL_MEM_FUN_DELETE;
    void operator=( const GlsText& ) DISTI_SPECIAL_MEM_FUN_DELETE;
};

//---------------------------------------------------------------------------
//  Stream operators for text enumeration types
//---------------------------------------------------------------------------
inline std::istream& operator>>(
    std::istream& instr, disti::GlsText::Justify_t& j )
{
    std::string str;
    instr >> str;

    if( str == "LEFT" )
    {
        j = disti::GlsText::LEFT;
    }
    else if( str == "CENTER" )
    {
        j = disti::GlsText::CENTER;
    }
    else if( str == "RIGHT" )
    {
        j = disti::GlsText::RIGHT;
    }
    return instr;
}

//---------------------------------------------------------------------------
inline std::ostream& operator<<( std::ostream& outstr, disti::GlsText::Justify_t j )
{
    switch( j )
    {
    case disti::GlsText::LEFT:
        outstr << "LEFT";
        break;
    case disti::GlsText::CENTER:
        outstr << "CENTER";
        break;
    case disti::GlsText::RIGHT:
        outstr << "RIGHT";
        break;
    }
    return outstr;
}

//===========================================================================
/** 
* Attributes of a text character.
* NOTE: Use of this attribute is deprecated.
* Instead use individual top-level attributes such as ("FauxBold" and "TextColor").
*/
//===========================================================================
class GlsTextCharAttr : public DistiAttributeDictionaryAttribute
{
public:
    DISTI_DEPRECATED( "This identifier is forbidden by the C++ standard. Use BaseClass instead." )
    typedef DistiAttributeDictionaryAttribute _BaseClass;
    typedef DistiAttributeDictionaryAttribute BaseClass;

    GlsTextCharAttr( const AttributeName& name, GlsText* text );

    virtual ~GlsTextCharAttr()
    {
        delete _dict;
    }

    // Do not write out, because this interface is only for backward
    // compatability
    virtual bool OkToWrite() const
    {
        return false;
    }

    virtual std::ostream& WriteValue( std::ostream& outstr )
    {
        _charAttr = _text->CharAttr( 0 );
        return BaseClass::WriteValue( outstr );
    }
    virtual std::istream& ReadValue( std::istream& instr )
    {
        // First get _charAttr to the current value.
        // This is because the instr may not contain
        // new values for all the attributes.
        _charAttr = _text->CharAttr( 0 );

        BaseClass::ReadValue( instr );

        _text->Baseline( _charAttr.baselineShift );
        _text->BgColor( _charAttr.bgColor );
        _text->CharSpacing( _charAttr.spacing );
        _text->TextColor( _charAttr.fgColor );
        _text->FauxBold( _charAttr.fauxBold );
        _text->Inverse( _charAttr.inverse );
        _text->CharScaling( _charAttr.scale );
        _text->StrikeThru( _charAttr.strikeThru );
        _text->Underline( _charAttr.underline );

        return instr;
    }

protected:
    GlsText*            _text;
    GlsText::CharAttr_t _charAttr;
};

} // namespace disti

DISTI_EXPORT std::ostream& operator<<( std::ostream& outstr, const disti::GlsText::CharAttr_t& c );
DISTI_EXPORT std::istream& operator>>( std::istream& instr, disti::GlsText::CharAttr_t& c );

#endif