src/core/qgsvectoroverlay.h

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/***************************************************************************
                        qgsvectoroverlay.h  -  description
                        ------------------
   begin                : January 2007
   copyright            : (C) 2007 by Marco Hugentobler
   email                : marco dot hugentobler at karto dot baug dot ethz dot ch
***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSVECTOROVERLAY_H
#define QGSVECTOROVERLAY_H

#include <QString>
#include "qgsvectorlayer.h"

class QgsOverlayObject;
class QgsRect;
class QgsRenderContext;

class CORE_EXPORT QgsVectorOverlay
{
  public:
    QgsVectorOverlay( QgsVectorLayer* vl );
    virtual ~QgsVectorOverlay();

    virtual void createOverlayObjects( const QgsRenderContext& renderContext ) = 0;

    void removeOverlayObjects();

    virtual void drawOverlayObjects( QgsRenderContext& context ) const = 0;

    QMap<QgsFeatureId, QgsOverlayObject*>* overlayObjects() {return &mOverlayObjects;}

    virtual QString typeName() const = 0;

    void setAttributes( const QgsAttributeList& list ) {mAttributes = list;}

    bool displayFlag() const {return mDisplayFlag;}

    void setDisplayFlag( bool flag ) {mDisplayFlag = flag;}

    virtual bool readXML( const QDomNode& overlayNode ) = 0;

    virtual bool writeXML( QDomNode& layer_node, QDomDocument& doc ) const = 0;

  protected:
    QgsVectorLayer* mVectorLayer;

    bool mDisplayFlag;

    QgsAttributeList mAttributes;

    QMap<QgsFeatureId, QgsOverlayObject*> mOverlayObjects;

    QMap<int, QgsPoint> mPositionConstraints;

  private:
    QgsVectorOverlay();
};

#endif