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# qscrollbar.h

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

    /****************************************************************************
    ** $Id: qt/src/widgets/qscrollbar.h   2.3.0   edited 2001-01-26 $
    **
    ** Definition of QScrollBar class
    **
    ** Created : 940427
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the widgets module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** 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, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    **********************************************************************/

    #ifndef QSCROLLBAR_H
    #define QSCROLLBAR_H

    class QTimer;

    #ifndef QT_H
    #include "qwidget.h"
    #include "qrangecontrol.h"
    #include "qdrawutil.h" // REMOVE THIS IN 3.0
    #endif // QT_H

    #ifndef QT_NO_SCROLLBAR

    class Q_EXPORT QScrollBar : public QWidget, public QRangeControl
    {
        Q_OBJECT
        Q_PROPERTY( int minValue READ minValue WRITE setMinValue )
        Q_PROPERTY( int maxValue READ maxValue WRITE setMaxValue )
        Q_PROPERTY( int lineStep READ lineStep WRITE setLineStep )
        Q_PROPERTY( int pageStep READ pageStep WRITE setPageStep )
        Q_PROPERTY( int value READ value WRITE setValue )
        Q_PROPERTY( bool tracking READ tracking WRITE setTracking )
        Q_PROPERTY( bool draggingSlider READ draggingSlider )
        Q_PROPERTY( Orientation orientation READ orientation WRITE setOrientation )

    public:
        QScrollBar( QWidget *parent, const char *name=0 );
        QScrollBar( Orientation, QWidget *parent, const char *name=0 );
        QScrollBar( int minValue, int maxValue, int LineStep, int PageStep,
                    int value, Orientation,
                    QWidget *parent, const char *name=0 );

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

        virtual void setPalette( const QPalette & );
        QSize       sizeHint() const;
        QSizePolicy sizePolicy() const;

        int  minValue() const;
        int  maxValue() const;
        void setMinValue( int );
        void setMaxValue( int );
        int  lineStep() const;
        int  pageStep() const;
        void setLineStep( int );
        void setPageStep( int );
        int  value() const;
        void setValue( int );

    signals:
        void        valueChanged( int value );
        void        sliderPressed();
        void        sliderMoved( int value );
        void        sliderReleased();
        void        nextLine();
        void        prevLine();
        void        nextPage();
        void        prevPage();

    protected:
        void        wheelEvent( QWheelEvent * );
        void        keyPressEvent( QKeyEvent * );
        void        resizeEvent( QResizeEvent * );
        void        paintEvent( QPaintEvent * );

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

        void        valueChange();
        void        stepChange();
        void        rangeChange();

        int         sliderStart() const;
        QRect       sliderRect() const;

        void styleChange( QStyle& );

    private slots:
        void doAutoRepeat();

    private:
        void init();
        void positionSliderFromValue();
        int calculateValueFromSlider() const;

        void sliderMinMax( int &, int & )           const;
        void metrics( int &, int &, int &, int& )   const;

        void startAutoRepeat();
        void stopAutoRepeat();

        QStyle::ScrollControl pointOver( const QPoint &p ) const;

        int rangeValueToSliderPos( int val ) const;
        int sliderPosToRangeValue( int  val ) const;

        void action( QStyle::ScrollControl control );

        void drawControls( uint controls, uint activeControl ) const;
        void drawControls( uint controls, uint activeControl,
                                    QPainter *p ) const;

        uint pressedControl  : 8;
        uint track           : 1;
        uint clickedAt       : 1;
        uint orient          : 1;

        int slidePrevVal;
        QCOORD sliderPos;
        QCOORD clickOffset;

        QTimer * repeater;
        void * d;

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

    inline void QScrollBar::setTracking( bool t )
    {
        track = t;
    }

    inline bool QScrollBar::tracking() const
    {
        return track;
    }

    inline QScrollBar::Orientation QScrollBar::orientation() const
    {
        return (Orientation)orient;
    }

    inline int QScrollBar::sliderStart() const
    {
        return sliderPos;
    }

    #endif // QT_NO_SCROLLBAR

    #endif // QSCROLLBAR_H