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
{
    Q_OBJECT
 
  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