qwt_plot_zoomer.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_PLOT_ZOOMER_H
#define QWT_PLOT_ZOOMER_H

#include "qwt_global.h"
#include "qwt_plot_picker.h"
#include <qstack.h>

class QWT_EXPORT QwtPlotZoomer: public QwtPlotPicker
{
    Q_OBJECT
public:
    explicit QwtPlotZoomer( QwtPlotCanvas *, bool doReplot = true );
    explicit QwtPlotZoomer( int xAxis, int yAxis,
                            QwtPlotCanvas *, bool doReplot = true );

    virtual ~QwtPlotZoomer();

    virtual void setZoomBase( bool doReplot = true );
    virtual void setZoomBase( const QRectF & );

    QRectF zoomBase() const;
    QRectF zoomRect() const;

    virtual void setAxis( int xAxis, int yAxis );

    void setMaxStackDepth( int );
    int maxStackDepth() const;

    const QStack<QRectF> &zoomStack() const;
    void setZoomStack( const QStack<QRectF> &,
        int zoomRectIndex = -1 );

    uint zoomRectIndex() const;

public Q_SLOTS:
    void moveBy( double x, double y );
    virtual void moveTo( const QPointF & );

    virtual void zoom( const QRectF & );
    virtual void zoom( int up );

Q_SIGNALS:
    void zoomed( const QRectF &rect );

protected:
    virtual void rescale();

    virtual QSizeF minZoomSize() const;

    virtual void widgetMouseReleaseEvent( QMouseEvent * );
    virtual void widgetKeyPressEvent( QKeyEvent * );

    virtual void begin();
    virtual bool end( bool ok = true );
    virtual bool accept( QPolygon & ) const;

private:
    void init( bool doReplot );

    class PrivateData;
    PrivateData *d_data;
};

#endif