qwt_plot_canvas.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_CANVAS_H
#define QWT_PLOT_CANVAS_H

#include "qwt_global.h"
#include <qframe.h>
#include <qpen.h>
#include <qpainterpath.h>
#include <qbitmap.h>

class QwtPlot;
class QPixmap;

class QWT_EXPORT QwtPlotCanvas : public QFrame
{
    Q_OBJECT

public:

    enum PaintAttribute
    {
        BackingStore = 1,

        Opaque       = 2,

        HackStyledBackground = 4,

        ImmediatePaint = 8
    };

    typedef QFlags<PaintAttribute> PaintAttributes;

    enum FocusIndicator
    {
        NoFocusIndicator,
        CanvasFocusIndicator,
        ItemFocusIndicator
    };

    explicit QwtPlotCanvas( QwtPlot * );
    virtual ~QwtPlotCanvas();

    QwtPlot *plot();
    const QwtPlot *plot() const;

    void setFocusIndicator( FocusIndicator );
    FocusIndicator focusIndicator() const;

    void setBorderRadius( double );
    double borderRadius() const;

    QPainterPath borderPath( const QRect &rect ) const;
    QBitmap borderMask( const QSize & ) const;

    void setPaintAttribute( PaintAttribute, bool on = true );
    bool testPaintAttribute( PaintAttribute ) const;

    const QPixmap *backingStore() const;
    void invalidateBackingStore();

    void replot();

    virtual bool event( QEvent * );

protected:
    virtual void paintEvent( QPaintEvent * );
    virtual void resizeEvent( QResizeEvent * );

    virtual void drawFocusIndicator( QPainter * );
    virtual void drawBorder( QPainter * );

    void updateStyleSheetInfo();

private:
    void drawCanvas( QPainter *, bool withBackground );

    class PrivateData;
    PrivateData *d_data;
};

Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotCanvas::PaintAttributes )

#endif