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/***************************************************************************
kcolumn.h - description
-------------------
begin : Mit Mai 21 2003
copyright : (C) 2003 by Friedrich W. H. Kossebau
email : Friedrich.W.H@Kossebau.de
***************************************************************************/
/***************************************************************************
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License version 2 as published by the Free Software Foundation. *
* *
***************************************************************************/
#ifndef KHE_KCOLUMN_H
#define KHE_KCOLUMN_H
// lib specific
#include "kadds.h"
#include "ksection.h"
class QPainter;
namespace KHE
{
class KColumnsView;
/** base class for columns of the KColumnsView
*
*
*@author Friedrich W. H. Kossebau
*/
class KColumn
{
// friend class KColumnsView;
public:
KColumn( KColumnsView *V );
virtual ~KColumn() {}
public: // API to be reimplemented in the subclasses
/** Before an update of the columns view each column that intersects with the area to be painted
* will be called with this function. As often multiple lines of a column are affected
* for each lines the same values (like first and last char positions) might be calculated.
* This function enables a one-time-calculation for such data that must be stored in some
* class members, though.
* @param P painter variable
* @param cx
* @param cw
* @param FirstLine no of the first of the range of lines to paint
*/
virtual void paintFirstLine( QPainter *P, KPixelXs Xs, int FirstLine );
/** the actual painting call for a column's line.
* The default implementation simply paints the background
*/
virtual void paintNextLine( QPainter *P );
/** */
virtual void paintEmptyColumn( QPainter *P, KPixelXs Xs, KPixelYs Ys );
public: // modification access
/** sets starting point of the column */
void setX( KPixelX NewX );
/** sets visibily */
void setVisible( bool V );
/** buffer actual line height in column */
void setLineHeight( KPixelY H );
public: // value access
/** left offset x in pixel */
KPixelX x() const;
/** total width in pixel */
KPixelX width() const;
/** right offset x in pixel */
KPixelX rightX() const;
/** should Column be displayed? */
bool isVisible() const;
/** convinience: returns width if visible else 0 */
KPixelX visibleWidth() const;
public: // functional logic
/** true if column overlaps with pixels between x-positions x1, x2 */
bool overlaps( KPixelXs Xs ) const;
protected:
/** sets width of the column */
void setWidth( KPixelX W );
/** */
void paintBlankLine( QPainter *P ) const;
protected: // general column data
/** pointer to the view */
KColumnsView *View;
/** should Column be displayed? */
bool Visible;
/** buffered value */
KPixelY LineHeight;
/** left offset x in pixel */
KPixelXs XSpan;
};
inline KPixelX KColumn::x() const { return XSpan.start(); }
inline KPixelX KColumn::rightX() const { return XSpan.end(); }
inline KPixelX KColumn::width() const { return XSpan.width(); }
inline bool KColumn::isVisible() const { return Visible; }
inline KPixelX KColumn::visibleWidth() const { return Visible ? XSpan.width(): 0; }
inline void KColumn::setX( KPixelX NewX ) { XSpan.moveToStart( NewX ); }
inline void KColumn::setWidth( KPixelX W ) { XSpan.setEndByWidth( W ); }
inline void KColumn::setVisible( bool V ) { Visible = V; }
inline void KColumn::setLineHeight( KPixelY H ) { LineHeight = H; }
inline bool KColumn::overlaps( KPixelXs Xs ) const { return XSpan.overlaps(Xs); }
}
#endif
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