qt 6.5.1 original

tests/manual/widgets/qgraphicsview/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+add_subdirectory(rubberband)

tests/manual/widgets/qgraphicsview/qgraphicsview.pro

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+TEMPLATE = subdirs
+SUBDIRS = rubberband

tests/manual/widgets/qgraphicsview/rubberband/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## rubberband Binary:
+#####################################################################
+
+qt_internal_add_manual_test(rubberband
+    GUI
+    SOURCES
+        rubberbandtest.cpp
+    LIBRARIES
+        Qt::Gui
+        Qt::Widgets
+)

tests/manual/widgets/qgraphicsview/rubberband/rubberband.pro

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+TEMPLATE = app
+SOURCES = rubberbandtest.cpp
+QT += gui widgets # core-private

tests/manual/widgets/qgraphicsview/rubberband/rubberbandtest.cpp

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+// Copyright (C) 2012 Thorbjørn Lund Martsum - tmartsum[at]gmail.com
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QtWidgets>
+
+class MyGraphicsItem : public QGraphicsRectItem
+{
+public:
+    MyGraphicsItem() : QGraphicsRectItem()
+    {
+        setFlags(QGraphicsItem::ItemIsSelectable);
+    }
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem * /* option*/, QWidget * /*widget*/) override
+    {
+        if (isSelected())
+            painter->fillRect(rect(), QColor(255, 0, 0));
+        else
+            painter->fillRect(rect(), QColor(0, 255, 0));
+    }
+};
+
+class MyGraphicsView : public QGraphicsView
+{
+    Q_OBJECT
+public:
+    MyGraphicsView(QWidget *w, QLabel *l) : QGraphicsView(w), rubberbandLabel(l)
+    {
+        setDragMode(QGraphicsView::RubberBandDrag);
+        connect(this, SIGNAL(rubberBandChanged(QRect, QPointF, QPointF)), this, SLOT(updateRubberbandInfo(QRect, QPointF, QPointF)));
+    }
+protected:
+    void mouseMoveEvent(QMouseEvent *event) override
+    {
+        QGraphicsView::mouseMoveEvent(event);
+
+        int rightmostInView = viewport()->mapToGlobal(viewport()->geometry().topRight()).x();
+        int xglobal = event->globalX();
+        if (xglobal > rightmostInView)
+            horizontalScrollBar()->setValue(horizontalScrollBar()->value() + 10);
+
+        int bottomPos = viewport()->mapToGlobal(viewport()->geometry().bottomRight()).y();
+        int yglobal = event->globalY();
+        if (yglobal > bottomPos)
+            verticalScrollBar()->setValue(verticalScrollBar()->value() + 10);
+    }
+
+protected slots:
+    void updateRubberbandInfo(QRect r, QPointF from, QPointF to)
+    {
+        QString textToShow;
+        QDebug s(&textToShow);
+        s << r << from << to;
+        rubberbandLabel->setText(textToShow);
+    }
+protected:
+    QLabel *rubberbandLabel;
+};
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    QWidget w;
+    w.setLayout(new QVBoxLayout);
+    QLabel *l = new QLabel(&w);
+    MyGraphicsView *v = new MyGraphicsView(&w, l);
+
+    w.layout()->addWidget(v);
+    w.layout()->addWidget(l);
+
+    QGraphicsScene s(0.0, 0.0, 5000.0, 5000.0);
+    v->setScene(&s);
+    v->setInteractive(true);
+    v->setRubberBandSelectionMode(Qt::IntersectsItemBoundingRect);
+
+    for (int u = 0; u < 100; ++u)
+        for (int n = 0; n < 100; ++n) {
+            MyGraphicsItem *item = new MyGraphicsItem();
+            item->setRect(QRectF(n * 80.0, u * 80.0, 50.0, 20.0));
+            s.addItem(item);
+        }
+
+    w.show();
+    app.exec();
+    return 0;
+}
+
+#include "rubberbandtest.moc"