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

#pragma once

#include <QwtGlobal>

#include <QObject>
#include <QPointer>
#include <QPoint>

class QwtPlot;
class QwtPlotShapeItem;
class QwtWidgetOverlay;

class QPainter;
class QRegion;

class Editor : public QObject
{
    Q_OBJECT

  public:
    enum Mode
    {
        NoMask,
        Mask,
        AlphaMask,
        AlphaMaskRedraw,
        AlphaMaskCopyMask
    };

    Editor( QwtPlot* );
    virtual ~Editor();

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

    virtual void setEnabled( bool on );
    bool isEnabled() const;

    void drawOverlay( QPainter* ) const;
    QRegion maskHint() const;

    virtual bool eventFilter( QObject*, QEvent*) QWT_OVERRIDE;

    void setMode( Mode mode );
    Mode mode() const;

  private:
    bool pressed( const QPoint& );
    bool moved( const QPoint& );
    void released( const QPoint& );

    QwtPlotShapeItem* itemAt( const QPoint& ) const;
    void raiseItem( QwtPlotShapeItem* );

    QRegion maskHint( QwtPlotShapeItem* ) const;
    void setItemVisible( QwtPlotShapeItem*, bool on );

    bool m_isEnabled;
    QPointer< QwtWidgetOverlay > m_overlay;

    // Mouse positions
    QPointF m_currentPos;
    QwtPlotShapeItem* m_editedItem;

    Mode m_mode;
};