/*****************************************************************************
 * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
 * This file may be used under the terms of the 3-clause BSD License
 *****************************************************************************/

#pragma once

#include <QwtPlotZoomer>
#include <QwtPlot>

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* ) QWT_OVERRIDE;

    virtual void rescale() QWT_OVERRIDE;

  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* m_cornerWidget;

    ScrollData* m_hScrollData;
    ScrollData* m_vScrollData;

    bool m_inZoom;
    bool m_alignCanvasToScales[ QwtAxis::AxisPositions ];
};