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50
51#ifndef PIEVIEW_H
52#define PIEVIEW_H
53
54#include <QAbstractItemView>
55
56//! [0]
57class PieView : public QAbstractItemView
58{
59 Q_OBJECT
60
61public:
62 PieView(QWidget *parent = nullptr);
63
64 QRect visualRect(const QModelIndex &index) const override;
65 void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) override;
66 QModelIndex indexAt(const QPoint &point) const override;
67
68protected slots:
69 void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight,
70 const QVector<int> &roles = QVector<int>()) override;
71 void rowsInserted(const QModelIndex &parent, int start, int end) override;
72 void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) override;
73
74protected:
75 bool edit(const QModelIndex &index, EditTrigger trigger, QEvent *event) override;
76 QModelIndex moveCursor(QAbstractItemView::CursorAction cursorAction,
77 Qt::KeyboardModifiers modifiers) override;
78
79 int horizontalOffset() const override;
80 int verticalOffset() const override;
81
82 bool isIndexHidden(const QModelIndex &index) const override;
83
84 void setSelection(const QRect&, QItemSelectionModel::SelectionFlags command) override;
85
86 void mousePressEvent(QMouseEvent *event) override;
87
88 void mouseMoveEvent(QMouseEvent *event) override;
89 void mouseReleaseEvent(QMouseEvent *event) override;
90
91 void paintEvent(QPaintEvent *event) override;
92 void resizeEvent(QResizeEvent *event) override;
93 void scrollContentsBy(int dx, int dy) override;
94
95 QRegion visualRegionForSelection(const QItemSelection &selection) const override;
96
97private:
98 QRect itemRect(const QModelIndex &item) const;
99 QRegion itemRegion(const QModelIndex &index) const;
100 int rows(const QModelIndex &index = QModelIndex()) const;
101 void updateGeometries() override;
102
103 int margin = 0;
104 int totalSize = 300;
105 int pieSize = totalSize - 2 * margin;
106 int validItems = 0;
107 double totalValue = 0.0;
108 QRubberBand *rubberBand = nullptr;
109 QPoint origin;
110};
111//! [0]
112
113#endif // PIEVIEW_H
114

source code of qtbase/examples/widgets/itemviews/chart/pieview.h