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    41 

    42 #ifndef PIEVIEW_H

    43 #define PIEVIEW_H

    44 

    45 #include <QAbstractItemView>

    46 #include <QFont>

    47 #include <QItemSelection>

    48 #include <QItemSelectionModel>

    49 #include <QModelIndex>

    50 #include <QRect>

    51 #include <QSize>

    52 #include <QPoint>

    53 #include <QWidget>

    54 

    55 QT_BEGIN_NAMESPACE

    56 class QRubberBand;

    57 QT_END_NAMESPACE

    58 

    59 //! [0]

    60 class PieView : public QAbstractItemView

    61 {

    62     Q_OBJECT

    63 

    64 public:

    65     PieView(QWidget *parent = 0);

    66 

    67     QRect visualRect(const QModelIndex &index) const;

    68     void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible);

    69     QModelIndex indexAt(const QPoint &point) const;

    70 

    71 protected slots:

    72     void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);

    73     void rowsInserted(const QModelIndex &parent, int start, int end);

    74     void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end);

    75 

    76 protected:

    77     bool edit(const QModelIndex &index, EditTrigger trigger, QEvent *event);

    78     QModelIndex moveCursor(QAbstractItemView::CursorAction cursorAction,

    79                            Qt::KeyboardModifiers modifiers);

    80 

    81     int horizontalOffset() const;

    82     int verticalOffset() const;

    83 

    84     bool isIndexHidden(const QModelIndex &index) const;

    85 

    86     void setSelection(const QRect&, QItemSelectionModel::SelectionFlags command);

    87 

    88     void mousePressEvent(QMouseEvent *event);

    89 

    90     void mouseMoveEvent(QMouseEvent *event);

    91     void mouseReleaseEvent(QMouseEvent *event);

    92 

    93     void paintEvent(QPaintEvent *event);

    94     void resizeEvent(QResizeEvent *event);

    95     void scrollContentsBy(int dx, int dy);

    96 

    97     QRegion visualRegionForSelection(const QItemSelection &selection) const;

    98 

    99 private:

   100     QRect itemRect(const QModelIndex &item) const;

   101     QRegion itemRegion(const QModelIndex &index) const;

   102     int rows(const QModelIndex &index = QModelIndex()) const;

   103     void updateGeometries();

   104 

   105     int margin;

   106     int totalSize;

   107     int pieSize;

   108     int validItems;

   109     double totalValue;

   110     QPoint origin;

   111     QRubberBand *rubberBand;

   112 };

   113 //! [0]

   114 

   115 #endif