qwt_widget_overlay.h

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/******************************************************************************
 * 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_WIDGET_OVERLAY_H
#define QWT_WIDGET_OVERLAY_H

#include "qwt_global.h"
#include <qwidget.h>

class QPainter;
class QRegion;

class QWT_EXPORT QwtWidgetOverlay : public QWidget
{
  public:
    enum MaskMode
    {
        NoMask,

        MaskHint,

        AlphaMask
    };

    enum RenderMode
    {
        AutoRenderMode,

        CopyAlphaMask,

        DrawOverlay
    };

    explicit QwtWidgetOverlay( QWidget* );
    virtual ~QwtWidgetOverlay();

    void setMaskMode( MaskMode );
    MaskMode maskMode() const;

    void setRenderMode( RenderMode );
    RenderMode renderMode() const;

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

  public Q_SLOTS:
    void updateOverlay();

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

    virtual QRegion maskHint() const;

    virtual void drawOverlay( QPainter* painter ) const = 0;

  private:
    void updateMask();
    void draw( QPainter* ) const;

  private:
    class PrivateData;
    PrivateData* m_data;
};

#endif