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3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
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6** This file is part of the Qt Charts module of the Qt Toolkit.
7**
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29
30// W A R N I N G
31// -------------
32//
33// This file is not part of the Qt Chart API. It exists purely as an
34// implementation detail. This header file may change from version to
35// version without notice, or even be removed.
36//
37// We mean it.
38
39#ifndef PIECHARTITEM_H
40#define PIECHARTITEM_H
41
42#include <QtCharts/QPieSeries>
43#include <private/chartitem_p.h>
44#include <private/piesliceitem_p.h>
45#include <QtCore/QPointer>
46#include <QtCharts/private/qchartglobal_p.h>
47
48QT_BEGIN_NAMESPACE
49class QGraphicsItem;
50QT_END_NAMESPACE
51
52QT_CHARTS_BEGIN_NAMESPACE
53class QPieSlice;
54class ChartPresenter;
55class PieAnimation;
56
57class Q_CHARTS_PRIVATE_EXPORT PieChartItem : public ChartItem
58{
59 Q_OBJECT
60
61public:
62 explicit PieChartItem(QPieSeries *series, QGraphicsItem* item = 0);
63 ~PieChartItem();
64
65 // from QGraphicsItem
66 QRectF boundingRect() const { return m_rect; }
67 void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) {}
68
69protected:
70 void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
71 void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
72 void mousePressEvent(QGraphicsSceneMouseEvent *event);
73 void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
74 void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
75
76public Q_SLOTS:
77 // from Chart
78 virtual void handleDomainUpdated();
79
80 void updateLayout();
81 void handleSlicesAdded(QList<QPieSlice *> slices);
82 void handleSlicesRemoved(QList<QPieSlice *> slices);
83 void handleSliceChanged();
84 void handleSeriesVisibleChanged();
85 void handleOpacityChanged();
86
87 void setAnimation(PieAnimation *animation);
88 ChartAnimation *animation() const;
89
90 // From ChartItem
91 void cleanup();
92private:
93 PieSliceData updateSliceGeometry(QPieSlice *slice);
94
95private:
96 QHash<QPieSlice *, PieSliceItem *> m_sliceItems;
97 QPointer<QPieSeries> m_series;
98 QRectF m_rect;
99 QPointF m_pieCenter;
100 qreal m_pieRadius;
101 qreal m_holeSize;
102 PieAnimation *m_animation;
103
104};
105
106QT_CHARTS_END_NAMESPACE
107
108#endif // PIECHARTITEM_H
109

source code of qtcharts/src/charts/piechart/piechartitem_p.h