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50
51#include <QtWidgets>
52
53static QGraphicsProxyWidget *createItem(const QSizeF &minimum = QSizeF(100.0, 100.0),
54 const QSizeF &preferred = QSize(150.0, 100.0),
55 const QSizeF &maximum = QSizeF(200.0, 100.0),
56 const QString &name = "0")
57{
58 QGraphicsProxyWidget *w = new QGraphicsProxyWidget;
59 w->setWidget(new QPushButton(name));
60 w->setData(0, name);
61 w->setMinimumSize(minimum);
62 w->setPreferredSize(preferred);
63 w->setMaximumSize(maximum);
64
65 w->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
66 return w;
67}
68
69int main(int argc, char **argv)
70{
71 QApplication app(argc, argv);
72
73 QGraphicsScene scene;
74 scene.setSceneRect(0, 0, 800, 480);
75
76 QSizeF minSize(30, 100);
77 QSizeF prefSize(210, 100);
78 QSizeF maxSize(300, 100);
79
80 QGraphicsProxyWidget *a = createItem(minSize, prefSize, maxSize, "A");
81 QGraphicsProxyWidget *b = createItem(minSize, prefSize, maxSize, "B");
82 QGraphicsProxyWidget *c = createItem(minSize, prefSize, maxSize, "C");
83 QGraphicsProxyWidget *d = createItem(minSize, prefSize, maxSize, "D");
84 QGraphicsProxyWidget *e = createItem(minSize, prefSize, maxSize, "E");
85 QGraphicsProxyWidget *f = createItem(QSizeF(30, 50), QSizeF(150, 50), maxSize, "F (overflow)");
86 QGraphicsProxyWidget *g = createItem(QSizeF(30, 50), QSizeF(30, 100), maxSize, "G (overflow)");
87
88 QGraphicsAnchorLayout *l = new QGraphicsAnchorLayout;
89 l->setSpacing(0);
90
91 QGraphicsWidget *w = new QGraphicsWidget(nullptr, Qt::Window);
92 w->setPos(20, 20);
93 w->setLayout(l);
94
95 // vertical
96 l->addAnchor(a, Qt::AnchorTop, l, Qt::AnchorTop);
97 l->addAnchor(b, Qt::AnchorTop, l, Qt::AnchorTop);
98
99 l->addAnchor(c, Qt::AnchorTop, a, Qt::AnchorBottom);
100 l->addAnchor(c, Qt::AnchorTop, b, Qt::AnchorBottom);
101 l->addAnchor(c, Qt::AnchorBottom, d, Qt::AnchorTop);
102 l->addAnchor(c, Qt::AnchorBottom, e, Qt::AnchorTop);
103
104 l->addAnchor(d, Qt::AnchorBottom, l, Qt::AnchorBottom);
105 l->addAnchor(e, Qt::AnchorBottom, l, Qt::AnchorBottom);
106
107 l->addAnchor(c, Qt::AnchorTop, f, Qt::AnchorTop);
108 l->addAnchor(c, Qt::AnchorVerticalCenter, f, Qt::AnchorBottom);
109 l->addAnchor(f, Qt::AnchorBottom, g, Qt::AnchorTop);
110 l->addAnchor(c, Qt::AnchorBottom, g, Qt::AnchorBottom);
111
112 // horizontal
113 l->addAnchor(l, Qt::AnchorLeft, a, Qt::AnchorLeft);
114 l->addAnchor(l, Qt::AnchorLeft, d, Qt::AnchorLeft);
115 l->addAnchor(a, Qt::AnchorRight, b, Qt::AnchorLeft);
116
117 l->addAnchor(a, Qt::AnchorRight, c, Qt::AnchorLeft);
118 l->addAnchor(c, Qt::AnchorRight, e, Qt::AnchorLeft);
119
120 l->addAnchor(b, Qt::AnchorRight, l, Qt::AnchorRight);
121 l->addAnchor(e, Qt::AnchorRight, l, Qt::AnchorRight);
122 l->addAnchor(d, Qt::AnchorRight, e, Qt::AnchorLeft);
123
124 l->addAnchor(l, Qt::AnchorLeft, f, Qt::AnchorLeft);
125 l->addAnchor(l, Qt::AnchorLeft, g, Qt::AnchorLeft);
126 l->addAnchor(f, Qt::AnchorRight, g, Qt::AnchorRight);
127
128
129 scene.addItem(w);
130 scene.setBackgroundBrush(Qt::darkGreen);
131 QGraphicsView view(&scene);
132
133 view.show();
134
135 return app.exec();
136}
137