#include <qstyle.h>

#include <qstyleoption.h>

#include "scrollbar.h"

ScrollBar::ScrollBar( QWidget * parent ):

    QScrollBar( parent )

{

    init();

}

ScrollBar::ScrollBar( Qt::Orientation o,

        QWidget *parent ):

    QScrollBar( o, parent )

{

    init();

}

ScrollBar::ScrollBar( double minBase, double maxBase,

        Qt::Orientation o, QWidget *parent ):

    QScrollBar( o, parent )

{

    init();

    setBase( minBase, maxBase );

    moveSlider( minBase, maxBase );

}

void ScrollBar::init()

{

    d_inverted = orientation() == Qt::Vertical;

    d_baseTicks = 1000000;

    d_minBase = 0.0;

    d_maxBase = 1.0;

    moveSlider( d_minBase, d_maxBase );

    connect( this, SIGNAL( sliderMoved( int ) ), SLOT( catchSliderMoved( int ) ) );

    connect( this, SIGNAL( valueChanged( int ) ), SLOT( catchValueChanged( int ) ) );

}

void ScrollBar::setInverted( bool inverted )

{

    if ( d_inverted != inverted )

    {

        d_inverted = inverted;

        moveSlider( minSliderValue(), maxSliderValue() );

    }

}

bool ScrollBar::isInverted() const

{

    return d_inverted;

}

void ScrollBar::setBase( double min, double max )

{

    if ( min != d_minBase || max != d_maxBase )

    {

        d_minBase = min;

        d_maxBase = max;

        moveSlider( minSliderValue(), maxSliderValue() );

    }

}

void ScrollBar::moveSlider( double min, double max )

{

    const int sliderTicks = qRound( ( max - min ) /

        ( d_maxBase - d_minBase ) * d_baseTicks );

    // setRange initiates a valueChanged of the scrollbars

    // in some situations. So we block

    // and unblock the signals.

    blockSignals( true );

    setRange( sliderTicks / 2, d_baseTicks - sliderTicks / 2 );

    int steps = sliderTicks / 200;

    if ( steps <= 0 )

        steps = 1;

    setSingleStep( steps );

    setPageStep( sliderTicks );

    int tick = mapToTick( min + ( max - min ) / 2 );

    if ( isInverted() )

        tick = d_baseTicks - tick;

    setSliderPosition( tick );

    blockSignals( false );

}

double ScrollBar::minBaseValue() const

{

    return d_minBase;

}

double ScrollBar::maxBaseValue() const

#ifndef _SCROLLBAR_H

#define _SCROLLBAR_H 1

#include <qscrollbar.h>

class ScrollBar: public QScrollBar

{

    Q_OBJECT

public:

    ScrollBar( QWidget *parent = NULL );

    ScrollBar( Qt::Orientation, QWidget *parent = NULL );

    ScrollBar( double minBase, double maxBase,

        Qt::Orientation o, QWidget *parent = NULL );

    void setInverted( bool );

    bool isInverted() const;

    double minBaseValue() const;

    double maxBaseValue() const;

    double minSliderValue() const;

    double maxSliderValue() const;

    int extent() const;

Q_SIGNALS:

    void sliderMoved( Qt::Orientation, double, double );

    void valueChanged( Qt::Orientation, double, double );

public Q_SLOTS:

    virtual void setBase( double min, double max );

    virtual void moveSlider( double min, double max );

protected:

    void sliderRange( int value, double &min, double &max ) const;

    int mapToTick( double ) const;

    double mapFromTick( int ) const;

private Q_SLOTS:

    void catchValueChanged( int value );

    void catchSliderMoved( int value );

private:

    void init();

    bool d_inverted;

    double d_minBase;

    double d_maxBase;

    int d_baseTicks;

};

#endif

#include <qevent.h>

#include <qwt_plot_canvas.h>

#include <qwt_plot_layout.h>

#include <qwt_scale_engine.h>

#include <qwt_scale_widget.h>

#include "scrollbar.h"

#include "scrollzoomer.h"

class ScrollData

{

public:

    ScrollData():

        scrollBar( NULL ),

        position( ScrollZoomer::OppositeToScale ),

        mode( Qt::ScrollBarAsNeeded )

    {

    }

    ~ScrollData()

    {

        delete scrollBar;

    }

    ScrollBar *scrollBar;

    ScrollZoomer::ScrollBarPosition position;

    Qt::ScrollBarPolicy mode;

};

ScrollZoomer::ScrollZoomer( QWidget *canvas ):

    QwtPlotZoomer( canvas ),

    d_cornerWidget( NULL ),

    d_hScrollData( NULL ),

    d_vScrollData( NULL ),

    d_inZoom( false )

{

    for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )

        d_alignCanvasToScales[ axis ] = false;

    if ( !canvas )

        return;

    d_hScrollData = new ScrollData;

    d_vScrollData = new ScrollData;

}

ScrollZoomer::~ScrollZoomer()

{

    delete d_cornerWidget;

    delete d_vScrollData;

    delete d_hScrollData;

}

void ScrollZoomer::rescale()

{

    QwtScaleWidget *xScale = plot()->axisWidget( xAxis() );

    QwtScaleWidget *yScale = plot()->axisWidget( yAxis() );

    if ( zoomRectIndex() <= 0 )

    {

        if ( d_inZoom )

        {

            xScale->setMinBorderDist( 0, 0 );

            yScale->setMinBorderDist( 0, 0 );

            QwtPlotLayout *layout = plot()->plotLayout();

            for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )

                layout->setAlignCanvasToScale( axis, d_alignCanvasToScales[ axis ] );

            d_inZoom = false;

        }

    }

    else

    {

        if ( !d_inZoom )

        {

            /*

             We set a minimum border distance.

             Otherwise the canvas size changes when scrolling,

             between situations where the major ticks are at

             the canvas borders (requiring extra space for the label)

             and situations where all labels can be painted below/top

             or left/right of the canvas.

             */

            int start, end;

            xScale->getBorderDistHint( start, end );

            xScale->setMinBorderDist( start, end );

            yScale->getBorderDistHint( start, end );

            yScale->setMinBorderDist( start, end );

            QwtPlotLayout *layout = plot()->plotLayout();

            for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )

            {

                d_alignCanvasToScales[axis] = 

#ifndef _SCROLLZOOMER_H

#define _SCROLLZOOMER_H

#include <qglobal.h>

#include <qwt_plot_zoomer.h>

#include <qwt_plot.h>

class ScrollData;

class ScrollBar;

class ScrollZoomer: public QwtPlotZoomer

{

    Q_OBJECT

public:

    enum ScrollBarPosition

    {

        AttachedToScale,

        OppositeToScale

    };

    ScrollZoomer( QWidget * );

    virtual ~ScrollZoomer();

    ScrollBar *horizontalScrollBar() const;

    ScrollBar *verticalScrollBar() const;

    void setHScrollBarMode( Qt::ScrollBarPolicy );

    void setVScrollBarMode( Qt::ScrollBarPolicy );

    Qt::ScrollBarPolicy vScrollBarMode () const;

    Qt::ScrollBarPolicy hScrollBarMode () const;

    void setHScrollBarPosition( ScrollBarPosition );

    void setVScrollBarPosition( ScrollBarPosition );

    ScrollBarPosition hScrollBarPosition() const;

    ScrollBarPosition vScrollBarPosition() const;

    QWidget* cornerWidget() const;

    virtual void setCornerWidget( QWidget * );

    virtual bool eventFilter( QObject *, QEvent * );

    virtual void rescale();

protected:

    virtual ScrollBar *scrollBar( Qt::Orientation );

    virtual void updateScrollBars();

    virtual void layoutScrollBars( const QRect & );

private Q_SLOTS:

    void scrollBarMoved( Qt::Orientation o, double min, double max );

private:

    bool needScrollBar( Qt::Orientation ) const;

    int oppositeAxis( int ) const;

    QWidget *d_cornerWidget;

    ScrollData *d_hScrollData;

    ScrollData *d_vScrollData;

    bool d_inZoom;

    bool d_alignCanvasToScales[ QwtPlot::axisCnt ];

};

#endif