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    41 

    42 #ifndef ABSTRACTSCROLLAREA_H

    43 #define ABSTRACTSCROLLAREA_H

    44 

    45 #include "gvbwidget.h"

    46 

    47 class ScrollBar;

    48 class QGraphicsGridLayout;

    49 

    50 class AbstractScrollArea : public GvbWidget

    51 {

    52     Q_OBJECT

    53 

    54 public:

    55 

    56     AbstractScrollArea(QGraphicsWidget *parent = 0);

    57     ~AbstractScrollArea();

    58 

    59 public:

    60 

    61     void setHorizontalScrollBarPolicy(Qt::ScrollBarPolicy policy);

    62     void setVerticalScrollBarPolicy(Qt::ScrollBarPolicy policy);

    63     Qt::ScrollBarPolicy verticalScrollBarPolicy() const;

    64     Qt::ScrollBarPolicy horizontalScrollBarPolicy() const;

    65 

    66     QGraphicsWidget *viewport() const;

    67     void setViewport(QGraphicsWidget *viewport);

    68 

    69     ScrollBar *verticalScrollBar() const;

    70     ScrollBar *horizontalScrollBar() const;

    71 

    72 signals:

    73 

    74     void viewportChanged(QGraphicsWidget *viewport);

    75 

    76 protected:

    77 

    78     virtual bool event(QEvent *e);

    79     virtual void scrollContentsBy(qreal dx, qreal dy);

    80 

    81 private slots:

    82 

    83     void verticalScrollStart();

    84     void verticalScroll(qreal);

    85     void horizontalScrollStart();

    86     void horizontalScroll(qreal);

    87 

    88 private:

    89 

    90     void adjustScrollBars();

    91 

    92     QGraphicsWidget *m_viewport;

    93     ScrollBar *m_horizontalScrollBar; 

    94     ScrollBar *m_verticalScrollBar; 

    95     Qt::ScrollBarPolicy m_verticalScrollBarPolicy;

    96     Qt::ScrollBarPolicy m_horizontalScrollBarPolicy;

    97     qreal m_prevHorizontalValue;

    98     qreal m_prevVerticalValue;

    99 };

   100 

   101 #endif // ABSTRACTSCROLLAREA_H