/************************************************************************
filename: 	CEGUIFont_xmlHandler.h
created:	21/2/2004
author:		Paul D Turner

purpose:	Defines interface for the Font class
*************************************************************************/
/*************************************************************************
Crazy Eddie's GUI System (http://www.cegui.org.uk)
Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*************************************************************************/
#ifndef _CEGUIFont_xmlHandler_h_
#define _CEGUIFont_xmlHandler_h_

#include "CEGUIFont.h"
#include "CEGUIXMLHandler.h"

// Start of CEGUI namespace section
namespace CEGUI
{

/*!
\brief
Handler class used to parse the Font XML files using SAX2
*/
class Font_xmlHandler : public XMLHandler
{
public:
	/*************************************************************************
	Construction & Destruction
	*************************************************************************/
	/*!
	\brief
	Constructor for Font::xmlHandler objects

	\param font
	Pointer to the Font object creating this xmlHandler object
	*/
	Font_xmlHandler(Font* font) : d_font(font) {}

	/*!
	\brief
	Destructor for Font::xmlHandler objects
	*/
	virtual ~Font_xmlHandler(void) {}

	/*************************************************************************
	SAX2 Handler overrides
	*************************************************************************/
	/*!
	\brief
	document processing (only care about elements, schema validates format)
	*/
    virtual void elementStart(const String& element, const XMLAttributes& attributes);
    virtual void elementEnd(const String& element);

private:
	/*************************************************************************
	Implementation Constants
	*************************************************************************/
	// XML related strings
	static const String FontElement;					//!< Tag name for Font elements.
	static const String MappingElement;				//!< Tag name for Mapping elements.
	static const String FontTypeStatic;				//!< Value used for FontTypeAttribute for a static (bitmapped) font.
	static const String FontTypeDynamic;				//!< Value used for FontTypeAttribute for a dynamic (true-type) font.
	static const String GlyphElement;					//!< Tag name for Glyph elements.
	static const String GlyphRangeElement;			//!< Tag name for GlyphRange elements.
	static const String GlyphSetElement;				//!< Tag name for GlyphSet elements.
	static const char	FontNameAttribute[];			//!< Attribute name that stores the name of the Font
    static const char	FontFilenameAttribute[];		//!< Attribute name that stores the filename, this is either an Imageset xml file, or a font file.
    static const char	FontResourceGroupAttribute[];   //!< Attribute name that stores the resource group identifier used when loading font file.
	static const char	FontTypeAttribute[];			//!< Attribute name that stores the type of font being defined (either static or dynamic).
	static const char	FontSizeAttribute[];			//!< Attribute name that stores the point size for a dynamic font.
	static const char	FontFirstCodepointAttribute[];	//!< Attribute name that stores the first code-point for a dynamic font.
	static const char	FontLastCodepointAttribute[];	//!< Attribute name that stores the last code-point for a dynamic font.
	static const char	FontNativeHorzResAttribute[];	//!< Optional attribute that stores 'native' horizontal resolution for the Font.
	static const char	FontNativeVertResAttribute[];	//!< Optional attribute that stores 'native' vertical resolution for the Font.
	static const char	FontAutoScaledAttribute[];		//!< Optional attribute that specifies whether the Font should be auto-scaled.
	static const char	FontAntiAliasedAttribute[];		//!< Optional attribute that specifies whether the TTF based font should be anti-aliased.
	static const char	MappingCodepointAttribute[];	//!< Attribute name that stores the Unicode code-point for a mapping.
	static const char	MappingImageAttribute[];		//!< Attribute name that stores the Image name for a mapping.
	static const char	MappingHorzAdvanceAttribute[];	//!< Attribute name that stores the horizontal advance for a glyph.
	static const char	GlyphCodepointAttribute[];				//!< Attribute name that stores the U+ codepoint to add to the set.
	static const char	GlyphRangeStartCodepointAttribute[];	//!< Attribute name that stores the U+ codepoint for the start of a range.
	static const char	GlyphRangeEndCodepointAttribute[];		//!< Attribute name that stores the U+ codepoint for the end of a range.
	static const char	GlyphSetGlyphsAttribute[];				//!< Attribute name that stores the UTF8 encoded codepoint set.

	// general constants
	static const int	AutoGenerateHorzAdvance;		//!< Horizontal advance value that tells the parser to auto-calculate some reasonable value.

	/*************************************************************************
	Implementation Data
	*************************************************************************/
	Font*	d_font;			//!< Font object that we are helping to build
	String	d_glyphSet;		//!< String holding the set of codepoints to be available.
};

} // End of  CEGUI namespace section

#endif