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This is the verbatim text of the qheader.h include file. It is provided only for illustration; the copyright remains with Trolltech.

** $Id: qt/qheader.h   3.3.8   edited Jan 11 14:38 $
** Definition of QHeader widget class (table header)
** Created : 961105
** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
** This file is part of the widgets module of the Qt GUI Toolkit.
** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Alternatively you may (at your option) use any
** later version of the GNU General Public License if such license has
** been publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** If you are unsure which license is appropriate for your use, please
** review the following information:
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** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file.  Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.

#ifndef QHEADER_H
#define QHEADER_H

#ifndef QT_H
#include "qwidget.h"
#include "qstring.h"
#include "qiconset.h" // conversion QPixmap->QIconset
#endif // QT_H

#ifndef QT_NO_HEADER

class QShowEvent;
class QHeaderData;
class QTable;

class Q_EXPORT QHeader : public QWidget
    friend class QTable;
    friend class QTableHeader;
    friend class QListView;

    Q_PROPERTY( Orientation orientation READ orientation WRITE setOrientation )
    Q_PROPERTY( bool tracking READ tracking WRITE setTracking )
    Q_PROPERTY( int count READ count )
    Q_PROPERTY( int offset READ offset WRITE setOffset )
    Q_PROPERTY( bool moving READ isMovingEnabled WRITE setMovingEnabled )
    Q_PROPERTY( bool stretching READ isStretchEnabled WRITE setStretchEnabled )

    QHeader( QWidget* parent=0, const char* name=0 );
    QHeader( int, QWidget* parent=0, const char* name=0 );

    int		addLabel( const QString &, int size = -1 );
    int		addLabel( const QIconSet&, const QString &, int size = -1 );
    void 	removeLabel( int section );
    virtual void setLabel( int, const QString &, int size = -1 );
    virtual void setLabel( int, const QIconSet&, const QString &, int size = -1 );
    QString 	label( int section ) const;
    QIconSet* 	iconSet( int section ) const;

    virtual void setOrientation( Orientation );
    Orientation orientation() const;
    virtual void setTracking( bool enable );
    bool	tracking() const;

    virtual void setClickEnabled( bool, int section = -1 );
    virtual void setResizeEnabled( bool, int section = -1 );
    virtual void setMovingEnabled( bool );
    virtual void setStretchEnabled( bool b, int section );
    void 	setStretchEnabled( bool b ) { setStretchEnabled( b, -1 ); }
    bool 	isClickEnabled( int section = -1 ) const;
    bool 	isResizeEnabled( int section = -1 ) const;
    bool 	isMovingEnabled() const;
    bool 	isStretchEnabled() const;
    bool 	isStretchEnabled( int section ) const;

    void 	resizeSection( int section, int s );
    int		sectionSize( int section ) const;
    int		sectionPos( int section ) const;
    int		sectionAt( int pos ) const;
    int		count() const;
    int 	headerWidth() const;
    QRect	sectionRect( int section ) const;

    virtual void setCellSize( int , int ); // obsolete, do not use
    int		cellSize( int i ) const { return sectionSize( mapToSection(i) ); } // obsolete, do not use
    int		cellPos( int ) const; // obsolete, do not use
    int		cellAt( int pos ) const { return mapToIndex( sectionAt(pos + offset()) ); } // obsolete, do not use

    int 	offset() const;

    QSize	sizeHint() const;

    int		mapToSection( int index ) const;
    int		mapToIndex( int section ) const;
    int		mapToLogical( int ) const; // obsolete, do not use
    int		mapToActual( int ) const; // obsolete, do not use

    void 	moveSection( int section, int toIndex );
    virtual void moveCell( int, int); // obsolete, do not use

    void 	setSortIndicator( int section, bool ascending = TRUE ); // obsolete, do not use
    inline void setSortIndicator( int section, SortOrder order )
	{ setSortIndicator( section, (order == Ascending) ); }
    int		sortIndicatorSection() const;
    SortOrder	sortIndicatorOrder() const;

    void        adjustHeaderSize() { adjustHeaderSize( -1 ); }

public slots:
    void 	setUpdatesEnabled( bool enable );
    virtual void setOffset( int pos );

    void	clicked( int section );
    void	pressed( int section );
    void	released( int section );
    void	sizeChange( int section, int oldSize, int newSize );
    void	indexChange( int section, int fromIndex, int toIndex );
    void	sectionClicked( int ); // obsolete, do not use
    void	moved( int, int ); // obsolete, do not use
    void	sectionHandleDoubleClicked( int section );

    void	paintEvent( QPaintEvent * );
    void	showEvent( QShowEvent *e );
    void 	resizeEvent( QResizeEvent *e );
    QRect	sRect( int index );

    virtual void paintSection( QPainter *p, int index, const QRect& fr);
    virtual void paintSectionLabel( QPainter* p, int index, const QRect& fr );

    void 	fontChange( const QFont & );

    void	mousePressEvent( QMouseEvent * );
    void	mouseReleaseEvent( QMouseEvent * );
    void	mouseMoveEvent( QMouseEvent * );
    void	mouseDoubleClickEvent( QMouseEvent * );

    void	keyPressEvent( QKeyEvent * );
    void	keyReleaseEvent( QKeyEvent * );

    void	handleColumnMove( int fromIdx, int toIdx );
    void 	adjustHeaderSize( int diff );
    void	init( int );

    void	paintRect( int p, int s );
    void	markLine( int idx );
    void	unMarkLine( int idx );
    int		pPos( int i ) const;
    int		pSize( int i ) const;
    int 	findLine( int );
    int		handleAt( int p );
    bool 	reverse() const;
    void 	calculatePositions( bool onlyVisible = FALSE, int start = 0 );
    void	handleColumnResize(int, int, bool, bool = TRUE );
    QSize	sectionSizeHint( int section, const QFontMetrics& fm ) const;
    void	setSectionSizeAndHeight( int section, int size );

    void 	resizeArrays( int size );
    void 	setIsATableHeader( bool b );
    int		offs;
    int		handleIdx;
    int		oldHIdxSize;
    int		moveToIdx;
    enum State { Idle, Sliding, Pressed, Moving, Blocked };
    State	state;
    QCOORD	clickPos;
    bool	trackingIsOn;
    int oldHandleIdx;
    int	cachedPos; // not used
    Orientation orient;

    QHeaderData *d;

private:	// Disabled copy constructor and operator=
#if defined(Q_DISABLE_COPY)
    QHeader( const QHeader & );
    QHeader &operator=( const QHeader & );

inline QHeader::Orientation QHeader::orientation() const
    return orient;

inline void QHeader::setTracking( bool enable ) { trackingIsOn = enable; }
inline bool QHeader::tracking() const { return trackingIsOn; }

extern Q_EXPORT bool qt_qheader_label_return_null_strings; // needed for professional edition

#endif // QT_NO_HEADER

#endif // QHEADER_H

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Qt 3.3.8