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39 #ifndef QGRAPHICSLAYOUTSTYLEINFO_P_H
40 #define QGRAPHICSLAYOUTSTYLEINFO_P_H
41 
42 //
43 //  W A R N I N G
44 //  -------------
45 //
46 // This file is not part of the Qt API.  It exists purely as an
47 // implementation detail.  This header file may change from version to
48 // version without notice, or even be removed.
49 //
50 // We mean it.
51 //
52 
53 #include <QtWidgets/private/qtwidgetsglobal_p.h>
54 #include <QtGui/private/qabstractlayoutstyleinfo_p.h>
55 #include <QtWidgets/qstyleoption.h>
56 
57 #include <memory>
58 
59 QT_REQUIRE_CONFIG(graphicsview);
60 
61 QT_BEGIN_NAMESPACE
62 
63 class QStyle;
64 class QWidget;
65 class QGraphicsLayoutPrivate;
66 
67 class QGraphicsLayoutStyleInfo : public QAbstractLayoutStyleInfo
68 {
69 public:
70     QGraphicsLayoutStyleInfo(const QGraphicsLayoutPrivate *layout);
71     ~QGraphicsLayoutStyleInfo();
72 
73     virtual qreal combinedLayoutSpacing(QLayoutPolicy::ControlTypes controls1,
74                                         QLayoutPolicy::ControlTypes controls2,
75                                         Qt::Orientation orientation) const override;
76 
77     virtual qreal perItemSpacing(QLayoutPolicy::ControlType control1,
78                                  QLayoutPolicy::ControlType control2,
79                                  Qt::Orientation orientation) const override;
80 
81     virtual qreal spacing(Qt::Orientation orientation) const override;
82 
83     virtual qreal windowMargin(Qt::Orientation orientation) const override;
84 
invalidate()85     virtual void invalidate() override
86     {
87         m_style = nullptr;
88         QAbstractLayoutStyleInfo::invalidate();
89     }
90 
91     QWidget *widget() const;
92     QStyle *style() const;
93 
94 private:
95     const QGraphicsLayoutPrivate *m_layout;
96     mutable QStyle *m_style;
97     QStyleOption m_styleOption;
98     std::unique_ptr<QWidget> m_widget;
99 };
100 
101 QT_END_NAMESPACE
102 
103 #endif // QGRAPHICSLAYOUTSTYLEINFO_P_H
104