abstractcolumnrenderer.h

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/*
    This file is part of the Okteta Gui library, made within the KDE community.

    Copyright 2003,2007-2009 Friedrich W. H. Kossebau <kossebau@kde.org>

    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) version 3, or any
    later version accepted by the membership of KDE e.V. (or its
    successor approved by the membership of KDE e.V.), which shall
    act as a proxy defined in Section 6 of version 3 of the license.

    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, see <http://www.gnu.org/licenses/>.
*/

#ifndef OKTETA_ABSTRACTCOLUMNRENDERER_H
#define OKTETA_ABSTRACTCOLUMNRENDERER_H

// lib
#include "kadds.h"
#include "oktetagui_export.h"

class QPainter;


namespace Okteta
{

class AbstractColumnStylist;

class AbstractColumnRendererPrivate;

class OKTETAGUI_EXPORT AbstractColumnRenderer
{
//    friend class ColumnsView;
  public:
    explicit AbstractColumnRenderer( AbstractColumnStylist* stylist );
    virtual ~AbstractColumnRenderer();

  public: // API to be reimplemented in the subclasses
    virtual void renderFirstLine( QPainter* painter, const PixelXRange& xSpan, int firstLineIndex );
    virtual void renderNextLine( QPainter* painter );

    virtual void renderColumn( QPainter* painter, const PixelXRange& xSpan, const PixelYRange& ySpan );
    virtual void renderEmptyColumn( QPainter* painter, const PixelXRange& xSpan, const PixelYRange& ySpan );

  public: // modification access
    void setX( PixelX x );
    void setVisible( bool isVisible );
    void setLineHeight( PixelY lineHeight );

  public: // value access
    AbstractColumnStylist* stylist() const;
    PixelX x() const;
    PixelX width() const;
    PixelX rightX() const;
    bool isVisible() const;
    PixelX visibleWidth() const;
    PixelY lineHeight() const;

  public: // functional logic
    bool overlaps( const PixelXRange& xSpan ) const;

  protected:
    void setWidth( PixelX width );
    void restrictToXSpan( PixelXRange* xSpan ) const;
    void renderBlankLine( QPainter* painter ) const;

  private:
     AbstractColumnRendererPrivate* const d; // TODO: shared d
};

}

#endif