CFlowchartEditor - linking things in CDiagramEditor

/* ==========================================================================
	CFlowchartLink

	Author :		Johan Rosengren, Abstrakt Mekanik AB

	Date :			2004-05-01

	Purpose :		This class represents a link object in the flowchart 
					data.	

	Description :	The class contains data for the from- and to-parts of the 
					link, as well as functions to save, load and clone it.

	Usage :			Instances of this class are managed by the flowchart 
					container class. Link data is public.

   ========================================================================*/
#include "stdafx.h"
#include "FlowchartLink.h"
#include "DiagramEditor/Tokenizer.h"

CFlowchartLink::CFlowchartLink()
/* ============================================================
	Function :		CFlowchartLink::CFlowchartLink
	Description :	constructor
					
	Return :		void
	Parameters :	none

	Usage :			

   ============================================================*/
{

	fromtype = 0;
	totype = 0;

}

CFlowchartLink::~CFlowchartLink()
/* ============================================================
	Function :		CFlowchartLink::~CFlowchartLink
	Description :	destructor
					
	Return :		void
	Parameters :	none

	Usage :			

   ============================================================*/
{
}

CFlowchartLink* CFlowchartLink::Clone() const
/* ============================================================
	Function :		CFlowchartLink::Clone
	Description :	Clone this object to a new object.
					
	Return :		CDiagramEntity*	-	The new object.
	Parameters :	none

	Usage :			Call to create a clone of the object. The 
					caller will have to delete the object.

   ============================================================*/
{

	CFlowchartLink* obj = new CFlowchartLink;
	obj->from = from;
	obj->to = to;
	obj->title = title;
	obj->fromtype = fromtype;
	obj->totype = totype;

	return obj;

}

CString CFlowchartLink::GetString() const 
/* ============================================================
	Function :		CFlowchartLink::GetString
	Description :	Returns this object as a string
					
	Return :		CString	-	String representation of this 
								link.
	Parameters :	none

	Usage :			Call to save the object to a file.

   ============================================================*/
{

	CString str;
	CString writetitle = title;
	writetitle.Replace( _T( ":" ), _T( "\\colon" ) );
	writetitle.Replace( _T( "," ), _T( "\\comma" ) );
	writetitle.Replace( _T( ";" ), _T( "\\semicolon" ) );
	writetitle.Replace( _T( "\r\n" ), _T( "\\newline" ) );

	str.Format( _T( "flowchart_link:%i,%i,%s,%s,%s;" ), fromtype, totype, writetitle, from, to );
	return str;

}

BOOL CFlowchartLink::FromString( const CString& str )
/* ============================================================
	Function :		CFlowchartLink::FromString
	Description :	Creates a CFlowchartLink-object from a 
					string.
					
	Return :		BOOL				-	TRUE if str is a 
											representation of 
											a link
	Parameters :	const CString& str	-	String representation 
											of a link.
					
	Usage :			Call to load data from a text stream.

   ============================================================*/
{

	BOOL result = FALSE;
	CTokenizer main( str, _T( ":" ) );
	CString header;
	CString data;
	if( main.GetSize() == 2 )
	{
		main.GetAt( 0, header );
		main.GetAt( 1, data );
		header.TrimLeft();
		header.TrimRight();
		data.TrimLeft();
		data.TrimRight();
		if( header == _T( "flowchart_link" ) )
		{
			CTokenizer tok( data.Left( data.GetLength() - 1 ) );
			int size = tok.GetSize();
			if( size == 5 )
			{
				int readtype;
				int readantitype;
				CString readtitle;
				CString readfrom;
				CString readto;

				tok.GetAt(0, readtype );
				tok.GetAt(1, readantitype );
				tok.GetAt(2, readtitle  );
				tok.GetAt(3, readfrom );
				tok.GetAt(4, readto );

				readtitle.Replace( _T( "\\semicolon" ), _T( ";" ) );
				readtitle.Replace( _T( "\\comma" ), _T( "," ) );
				readtitle.Replace( _T( "\\colon" ), _T( ":" ) );
				readtitle.Replace( _T( "\\newline" ), _T( "\r\n" ) );

				fromtype = readtype;
				totype = readantitype;
				title = readtitle;
				from = readfrom;
				to = readto;

				result = TRUE;
			}
		}
	}

	return result;

}

int CFlowchartLink::ReverseLink( int link )
/* ============================================================
	Function :		CFlowchartLink::ReverseLink
	Description :	This is a static function returning the 
					reverse of link.
					
	Return :		int			-	Reverse type, or the same 
									as the input if none exist.
	Parameters :	int link	-	Link type to test.
					
	Usage :			Call this as a convenience to get the 
					reverse of a link type.

   ============================================================*/
{

	int result = link;
	if( link == LINK_LEFT )
		result = LINK_RIGHT;
	if( link == LINK_RIGHT )
		result = LINK_LEFT;
	if( link == LINK_TOP )
		result = LINK_BOTTOM;
	if( link == LINK_BOTTOM )
		result = LINK_TOP;

	return result;

}