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3** Copyright (C) 2016 The Qt Company Ltd.
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6** This file is part of the Qt Charts module of the Qt Toolkit.
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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 LEGENDLAYOUT_H
40#define LEGENDLAYOUT_H
41#include <QtWidgets/QGraphicsLayout>
42#include <QtCharts/QChartGlobal>
43#include <QtCharts/private/qchartglobal_p.h>
44
45QT_CHARTS_BEGIN_NAMESPACE
46
47class QLegend;
48class LegendMarkerItem;
49
50class Q_CHARTS_PRIVATE_EXPORT LegendLayout : public QGraphicsLayout
51{
52public:
53
54 LegendLayout(QLegend *legend);
55 virtual ~LegendLayout();
56
57 void setGeometry(const QRectF &rect);
58
59 void setOffset(qreal x, qreal y);
60 QPointF offset() const;
61
62 void invalidate();
63protected:
64 QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
65 int count() const { return 0; }
66 QGraphicsLayoutItem *itemAt(int) const { return 0; };
67 void removeAt(int) {};
68
69private:
70 void setAttachedGeometry(const QRectF &rect);
71 void setDettachedGeometry(const QRectF &rect);
72
73 struct LegendWidthStruct {
74 LegendMarkerItem *item;
75 qreal width;
76 };
77 static bool widthLongerThan(const LegendWidthStruct *item1,
78 const LegendWidthStruct *item2);
79
80private:
81 QLegend *m_legend;
82 qreal m_offsetX;
83 qreal m_offsetY;
84 qreal m_minOffsetX;
85 qreal m_minOffsetY;
86 qreal m_maxOffsetX;
87 qreal m_maxOffsetY;
88 qreal m_width;
89 qreal m_height;
90};
91
92QT_CHARTS_END_NAMESPACE
93
94#endif
95

source code of qtcharts/src/charts/legend/legendlayout_p.h