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39
40#ifndef QGRAPHICSLAYOUT_P_H
41#define QGRAPHICSLAYOUT_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of other Qt classes. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtWidgets/private/qtwidgetsglobal_p.h>
55
56#include "qgraphicslayout.h"
57#include "qgraphicslayoutitem_p.h"
58#include <QtWidgets/qstyle.h>
59#include <QtWidgets/qwidget.h>
60#include <QtWidgets/qstyleoption.h>
61
62QT_REQUIRE_CONFIG(graphicsview);
63
64QT_BEGIN_NAMESPACE
65
66class QGraphicsLayoutItem;
67class QGraphicsWidget;
68
69#ifdef QT_DEBUG
70inline bool qt_graphicsLayoutDebug()
71{
72 static int checked_env = -1;
73 if(checked_env == -1)
74 checked_env = !!qEnvironmentVariableIntValue(varName: "QT_GRAPHICSLAYOUT_DEBUG");
75 return checked_env;
76}
77#endif
78
79
80class QLayoutStyleInfo
81{
82public:
83 inline QLayoutStyleInfo() { invalidate(); }
84 inline QLayoutStyleInfo(QStyle *style, QWidget *widget)
85 : m_valid(true), m_style(style), m_widget(widget)
86 {
87 Q_ASSERT(style);
88 if (widget) //###
89 m_styleOption.initFrom(w: widget);
90 m_defaultSpacing[0] = style->pixelMetric(metric: QStyle::PM_LayoutHorizontalSpacing, option: &m_styleOption);
91 m_defaultSpacing[1] = style->pixelMetric(metric: QStyle::PM_LayoutVerticalSpacing, option: &m_styleOption);
92 }
93
94 inline void invalidate() { m_valid = false; m_style = nullptr; m_widget = nullptr; }
95
96 inline QStyle *style() const { return m_style; }
97 inline QWidget *widget() const { return m_widget; }
98
99 inline bool operator==(const QLayoutStyleInfo &other) const
100 { return m_style == other.m_style && m_widget == other.m_widget; }
101 inline bool operator!=(const QLayoutStyleInfo &other) const
102 { return !(*this == other); }
103
104 inline void setDefaultSpacing(Qt::Orientation o, qreal spacing){
105 if (spacing >= 0)
106 m_defaultSpacing[int(o) - 1] = spacing;
107 }
108
109 inline qreal defaultSpacing(Qt::Orientation o) const {
110 return m_defaultSpacing[int(o) - 1];
111 }
112
113 inline qreal perItemSpacing(QSizePolicy::ControlType control1,
114 QSizePolicy::ControlType control2,
115 Qt::Orientation orientation) const
116 {
117 Q_ASSERT(style());
118 return style()->layoutSpacing(control1, control2, orientation, option: &m_styleOption, widget: widget());
119 }
120private:
121 bool m_valid;
122 QStyle *m_style;
123 QWidget *m_widget;
124 QStyleOption m_styleOption;
125 qreal m_defaultSpacing[2];
126};
127
128class Q_AUTOTEST_EXPORT QGraphicsLayoutPrivate : public QGraphicsLayoutItemPrivate
129{
130 Q_DECLARE_PUBLIC(QGraphicsLayout)
131
132public:
133 QGraphicsLayoutPrivate() : QGraphicsLayoutItemPrivate(nullptr, true), left(-1.0), top(-1.0), right(-1.0), bottom(-1.0),
134 activated(true) { }
135
136 void reparentChildItems(QGraphicsItem *newParent);
137 void getMargin(qreal *result, qreal userMargin, QStyle::PixelMetric pm) const;
138 Qt::LayoutDirection visualDirection() const;
139
140 void addChildLayoutItem(QGraphicsLayoutItem *item);
141 void activateRecursive(QGraphicsLayoutItem *item);
142
143 qreal left, top, right, bottom;
144 bool activated;
145};
146
147QT_END_NAMESPACE
148
149#endif
150

source code of qtbase/src/widgets/graphicsview/qgraphicslayout_p.h