qt 6.5.1 original

tests/benchmarks/widgets/graphicsview/qgraphicsview/benchapps/scrolltest/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## scrolltest Binary:
+#####################################################################
+
+qt_internal_add_benchmark(scrolltest
+    GUI
+    SOURCES
+        main.cpp
+    LIBRARIES
+        Qt::Gui
+)

tests/benchmarks/widgets/graphicsview/qgraphicsview/benchapps/scrolltest/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+#include <QtGui>
+
+#include "valgrind/callgrind.h"
+
+class ItemMover : public QObject
+{
+    Q_OBJECT
+public:
+    ItemMover(QGraphicsItem *item)
+        : _item(item)
+    {
+        startTimer(0);
+    }
+
+protected:
+    void timerEvent(QTimerEvent *event)
+    {
+        _item->moveBy(-1, 0);
+    }
+
+private:
+    QGraphicsItem *_item;
+};
+
+class ClipItem : public QGraphicsRectItem
+{
+public:
+    ClipItem(qreal x, qreal y, qreal w, qreal h, const QPen &pen, const QBrush &brush)
+        : QGraphicsRectItem(x, y, w, h)
+    {
+        setPen(pen);
+        setBrush(brush);
+    }
+
+    QPainterPath shape() const
+    {
+        QPainterPath path;
+        path.addRect(rect());
+        return path;
+    }
+};
+
+class CountView : public QGraphicsView
+{
+protected:
+    void paintEvent(QPaintEvent *event)
+    {
+        static int n = 0;
+        if (n)
+            CALLGRIND_START_INSTRUMENTATION
+        QGraphicsView::paintEvent(event);
+        if (n)
+            CALLGRIND_STOP_INSTRUMENTATION
+        if (++n == 500)
+            qApp->quit();
+    }
+};
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    QGraphicsScene scene;
+    scene.setItemIndexMethod(QGraphicsScene::NoIndex);
+
+    ClipItem *clipItem = new ClipItem(0, 0, 100, 100, QPen(), QBrush(Qt::blue));
+    clipItem->setFlag(QGraphicsItem::ItemClipsChildrenToShape);
+    clipItem->setData(0, "clipItem");
+    scene.addItem(clipItem);
+
+    QGraphicsRectItem *scrollItem = scene.addRect(0, 0, 10, 10, QPen(Qt::NoPen), QBrush(Qt::NoBrush));
+    scrollItem->setParentItem(clipItem);
+    scrollItem->setFlag(QGraphicsItem::ItemIsMovable);
+    scrollItem->setData(0, "scrollItem");
+
+    for (int y = 0; y < 25; ++y) {
+        for (int x = 0; x < 25; ++x) {
+            ClipItem *rect = new ClipItem(0, 0, 90, 20, QPen(Qt::NoPen), QBrush(Qt::green));
+            rect->setParentItem(scrollItem);
+            rect->setPos(x * 95, y * 25);
+            rect->setData(0, qPrintable(QString("rect %1 %2").arg(x).arg(y)));
+            rect->setFlag(QGraphicsItem::ItemClipsChildrenToShape);
+
+            QGraphicsEllipseItem *ellipse = new QGraphicsEllipseItem(-5, -5, 10, 10);
+            ellipse->setPen(QPen(Qt::NoPen));
+            ellipse->setBrush(QBrush(Qt::yellow));
+            ellipse->setParentItem(rect);
+            ellipse->setData(0, qPrintable(QString("ellipse %1 %2").arg(x).arg(y)));
+        }
+    }
+
+    scrollItem->setRect(scrollItem->childrenBoundingRect());
+
+#if 0
+    ItemMover mover(scrollItem);
+#endif
+
+    CountView view;
+    view.setScene(&scene);
+    view.setSceneRect(-25, -25, 150, 150);
+    view.resize(300, 300);
+    view.show();
+
+    return app.exec();
+}
+
+#include "main.moc"