symbolDrawer.h

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/*********************************************************************
** Copyright (c) 2001 MAK Technologies, Inc.
** All rights reserved.
*********************************************************************/
/*********************************************************************
** $RCSfile: symbolDrawer.h,v $ $Revision: 1.16 $ $State: Exp $
*********************************************************************/


#ifndef DtSymbolDrawerInterface_H_
#define DtSymbolDrawerInterface_H_

#include "symbolDrawerInterface/symbolDrawerInterfaceDefines.h"

#include <QtCore/QSize>
#include <QtCore/QRect>
#include <QtCore/QObject>
#include <QtGui/QColor>

class DtSymbol;
class QPaintDevice;
class QPainter;


class DT_DLL_symbolDrawerInterface DtSymbolDrawer : public QObject
{
public:
   DtSymbolDrawer();
   virtual ~DtSymbolDrawer();

   virtual bool doDrawing(QPainter& paint, 
                          const DtSymbol * const symbol);

   virtual QSize calcBBox( const DtSymbol * const symbol ) const = 0;
   virtual QRect calcBRect( const DtSymbol * const symbol) const;

   virtual bool forceUpdate(const DtSymbol* const symbol) const;

   virtual bool endTransparentDraw(QPainter& paint,
                    const DtSymbol * const symbol) const;

   virtual void processHiddenSymbolAction(QPainter& paint, const DtSymbol * const symbol);

public:
   static double drawScalingFactor();
   static void setDrawScalingFactor(double d);

   virtual bool      draw(QPainter& paint, 
                          const DtSymbol * const symbol ) const = 0;

   static void setHighlightColor(const QColor& color);
   static const QColor& highlightColor();

protected:
   DtSymbolDrawer(const DtSymbolDrawer& orig);

   DtSymbolDrawer& operator=(const DtSymbolDrawer& orig);

protected:
   static double gDrawScalingFactor;
   static QColor theHighlightColor;
};

typedef DtSymbolDrawer* (*DtSymbolDrawerCreatorFcn)();

#endif