qscrollbar.h

/****************************************************************************
** $Id: qscrollbar.h,v 2.20 1999/06/17 05:12:21 ettrich Exp $
**
** Definition of QScrollBar class
**
** Created : 940427
**
** Copyright (C) 1992-1999 Troll Tech AS.  All rights reserved.
**
** This file is part of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Troll Tech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** Licensees holding valid Qt Professional Edition licenses may use this
** file in accordance with the Qt Professional Edition License Agreement
** provided with the Qt Professional Edition.
**
** See http://www.troll.no/pricing.html or email sales@troll.no for
** information about the Professional Edition licensing, or see
** http://www.troll.no/qpl/ for QPL licensing information.
**
*****************************************************************************/

#ifndef QSCROLLBAR_H
#define QSCROLLBAR_H

class QTimer;

#ifndef QT_H
#include "qwidget.h"
#include "qrangecontrol.h"
#include "qdrawutil.h"
#endif // QT_H


class Q_EXPORT QScrollBar : public QWidget, public QRangeControl
{
    Q_OBJECT
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;

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 // QSCROLLBAR_H